Antiviral Agents in Development for Zika Virus Infections
Identifieur interne : 000A93 ( Pmc/Corpus ); précédent : 000A92; suivant : 000A94Antiviral Agents in Development for Zika Virus Infections
Auteurs : Mariana Baz ; Guy BoivinSource :
- Pharmaceuticals [ 1424-8247 ] ; 2019.
Abstract
In 1947, Zika virus (ZIKV), a mosquito-borne flavivirus was identified in Uganda and subsequently spread to Asia and the Pacific regions. In 2015, it was introduced in Brazil causing an important social and sanitary alarm due to its increased virulence and rapid dissemination. Importantly, ZIKV infections have been associated with severe neurological complications such as Guillain–Barré syndrome and microcephaly in fetuses and newborns. Although enormous efforts were made by investigators in the development of effective countermeasures against ZIKV, there is still no approved specific antiviral drug for the treatment of ZIKV infections. Herein, we review several anti ZIKV candidates including drugs targeting both the virus (structural proteins and enzymes) and cellular elements.
Url:
DOI: 10.3390/ph12030101
PubMed: 31261947
PubMed Central: 6789597
Links to Exploration step
PMC:6789597Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Antiviral Agents in Development for Zika Virus Infections</title><author><name sortKey="Baz, Mariana" sort="Baz, Mariana" uniqKey="Baz M" first="Mariana" last="Baz">Mariana Baz</name></author><author><name sortKey="Boivin, Guy" sort="Boivin, Guy" uniqKey="Boivin G" first="Guy" last="Boivin">Guy Boivin</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">31261947</idno><idno type="pmc">6789597</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6789597</idno><idno type="RBID">PMC:6789597</idno><idno type="doi">10.3390/ph12030101</idno><date when="2019">2019</date><idno type="wicri:Area/Pmc/Corpus">000A93</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000A93</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Antiviral Agents in Development for Zika Virus Infections</title><author><name sortKey="Baz, Mariana" sort="Baz, Mariana" uniqKey="Baz M" first="Mariana" last="Baz">Mariana Baz</name></author><author><name sortKey="Boivin, Guy" sort="Boivin, Guy" uniqKey="Boivin G" first="Guy" last="Boivin">Guy Boivin</name></author></analytic><series><title level="j">Pharmaceuticals</title><idno type="eISSN">1424-8247</idno><imprint><date when="2019">2019</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>In 1947, Zika virus (ZIKV), a mosquito-borne flavivirus was identified in Uganda and subsequently spread to Asia and the Pacific regions. In 2015, it was introduced in Brazil causing an important social and sanitary alarm due to its increased virulence and rapid dissemination. Importantly, ZIKV infections have been associated with severe neurological complications such as Guillain–Barré syndrome and microcephaly in fetuses and newborns. Although enormous efforts were made by investigators in the development of effective countermeasures against ZIKV, there is still no approved specific antiviral drug for the treatment of ZIKV infections. Herein, we review several anti ZIKV candidates including drugs targeting both the virus (structural proteins and enzymes) and cellular elements.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Kuno, G" uniqKey="Kuno G">G. Kuno</name></author><author><name sortKey="Chang, G J" uniqKey="Chang G">G.J. Chang</name></author><author><name sortKey="Tsuchiya, K R" uniqKey="Tsuchiya K">K.R. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Pharmaceuticals (Basel)</journal-id><journal-id journal-id-type="iso-abbrev">Pharmaceuticals (Basel)</journal-id><journal-id journal-id-type="publisher-id">pharmaceuticals</journal-id><journal-title-group><journal-title>Pharmaceuticals</journal-title></journal-title-group><issn pub-type="epub">1424-8247</issn><publisher><publisher-name>MDPI</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">31261947</article-id><article-id pub-id-type="pmc">6789597</article-id><article-id pub-id-type="doi">10.3390/ph12030101</article-id><article-id pub-id-type="publisher-id">pharmaceuticals-12-00101</article-id><article-categories><subj-group subj-group-type="heading"><subject>Review</subject></subj-group></article-categories><title-group><article-title>Antiviral Agents in Development for Zika Virus Infections</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Baz</surname><given-names>Mariana</given-names></name><xref rid="c1-pharmaceuticals-12-00101" ref-type="corresp">*</xref></contrib><contrib contrib-type="author"><name><surname>Boivin</surname><given-names>Guy</given-names></name><xref rid="c1-pharmaceuticals-12-00101" ref-type="corresp">*</xref></contrib></contrib-group><aff id="af1-pharmaceuticals-12-00101">Research Center in Infectious Diseases of the CHU of Québec and Université Laval, Québec City, QC G1V 4G2, Canada</aff><author-notes><corresp id="c1-pharmaceuticals-12-00101"><label>*</label>Correspondence: <email>Mariana.Baz@crchudequebec.ulaval.ca</email> (M.B.); <email>Guy.Boivin@crchul.ulaval.ca</email> (G.B.); Tel.: +1-418-525-4444 (ext. 48281) (M.B.); +1-418-654-2705 (G.B.)</corresp></author-notes><pub-date pub-type="epub"><day>29</day><month>6</month><year>2019</year></pub-date><pub-date pub-type="collection"><month>9</month><year>2019</year></pub-date><volume>12</volume><issue>3</issue><elocation-id>101</elocation-id><history><date date-type="received"><day>31</day><month>5</month><year>2019</year></date><date date-type="accepted"><day>26</day><month>6</month><year>2019</year></date></history><permissions><copyright-statement>© 2019 by the authors.</copyright-statement><copyright-year>2019</copyright-year><license license-type="open-access"><license-p>Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">http://creativecommons.org/licenses/by/4.0/</ext-link>).</license-p></license></permissions><abstract><p>In 1947, Zika virus (ZIKV), a mosquito-borne flavivirus was identified in Uganda and subsequently spread to Asia and the Pacific regions. In 2015, it was introduced in Brazil causing an important social and sanitary alarm due to its increased virulence and rapid dissemination. Importantly, ZIKV infections have been associated with severe neurological complications such as Guillain–Barré syndrome and microcephaly in fetuses and newborns. Although enormous efforts were made by investigators in the development of effective countermeasures against ZIKV, there is still no approved specific antiviral drug for the treatment of ZIKV infections. Herein, we review several anti ZIKV candidates including drugs targeting both the virus (structural proteins and enzymes) and cellular elements.</p></abstract><kwd-group><kwd>Zika virus</kwd><kwd>antiviral agents</kwd><kwd>small molecules</kwd><kwd>virus targets</kwd><kwd>host targets</kwd><kwd>repurposing</kwd><kwd>pre-clinical studies</kwd></kwd-group></article-meta></front><body><sec sec-type="intro" id="sec1-pharmaceuticals-12-00101"><title>1. Introduction</title><p>Zika virus (ZIKV) is a member of the <italic>Flaviviridae</italic> family and <italic>Flavivirus</italic> genus [<xref rid="B1-pharmaceuticals-12-00101" ref-type="bibr">1</xref>]. The flavivirus genus is the largest among the <italic>Flaviviridae</italic> family with 53 different species [<xref rid="B2-pharmaceuticals-12-00101" ref-type="bibr">2</xref>] and can be further divided into non-vector, tick-borne, and mosquito-borne clusters [<xref rid="B1-pharmaceuticals-12-00101" ref-type="bibr">1</xref>]. Mosquito-borne flaviviruses such as ZIKV, dengue virus (DENV), West Nile virus (WNV), yellow fever virus (YFV), and Japanese encephalitis virus (JEV), have become an increasing public health concern over the last decade since their global incidence has grown dramatically. </p><p>ZIKV (strain MR 766) was first isolated in 1947 [<xref rid="B3-pharmaceuticals-12-00101" ref-type="bibr">3</xref>] from serum samples of a Rhesus monkey during investigation on YFV in the Zika forest of Uganda. In 1948, the virus was isolated from a pool of <italic>Aedes Africanus</italic> (<italic>Stegomyia</italic>) mosquitoes in the same forest [<xref rid="B4-pharmaceuticals-12-00101" ref-type="bibr">4</xref>]. The first human cases of ZIKV infections were reported in Africa in the 1950s [<xref rid="B5-pharmaceuticals-12-00101" ref-type="bibr">5</xref>] and later in Asia but remained restricted to these regions until 2007, when a large outbreak occurred in Yap Island, Federated States of Micronesia followed by outbreaks in French Polynesia, New Caledonia, and the Cook Islands in 2013 and 2014 [<xref rid="B6-pharmaceuticals-12-00101" ref-type="bibr">6</xref>]. In May 2015, ZIKV spread across the Pacific Ocean and was introduced in Brazil where it caused more than one million cases [<xref rid="B7-pharmaceuticals-12-00101" ref-type="bibr">7</xref>]. As of May 2019, the virus rapidly spread to 84 countries, territories or subnational areas, and became a public health problem worldwide [<xref rid="B8-pharmaceuticals-12-00101" ref-type="bibr">8</xref>]. </p><p>ZIKV infection is usually asymptomatic or produces a relatively mild illness with an uneventful recovery [<xref rid="B6-pharmaceuticals-12-00101" ref-type="bibr">6</xref>]. However, during the 2015 epidemics in South America, ZIKV became a global health threat, showing increased virulence, rapid spread, and an association with severe neurological complications such as an unexpected rise of microcephaly cases in fetuses and newborns and a remarkable increase in Guillain–Barré syndrome cases [<xref rid="B8-pharmaceuticals-12-00101" ref-type="bibr">8</xref>,<xref rid="B9-pharmaceuticals-12-00101" ref-type="bibr">9</xref>]. ZIKV is transmitted to people primarily through the bite of infected female <italic>Aedes</italic> species mosquitoes (i.e., <italic>Aedes aegypti</italic> and <italic>Aedes albopictus</italic>) [<xref rid="B10-pharmaceuticals-12-00101" ref-type="bibr">10</xref>,<xref rid="B11-pharmaceuticals-12-00101" ref-type="bibr">11</xref>]. ZIKVs can infect different tissues including reproductive tissues and organs [<xref rid="B12-pharmaceuticals-12-00101" ref-type="bibr">12</xref>,<xref rid="B13-pharmaceuticals-12-00101" ref-type="bibr">13</xref>,<xref rid="B14-pharmaceuticals-12-00101" ref-type="bibr">14</xref>]. In males, ZIKV can infect testes, the prostate, and seminal vesicles [<xref rid="B14-pharmaceuticals-12-00101" ref-type="bibr">14</xref>,<xref rid="B15-pharmaceuticals-12-00101" ref-type="bibr">15</xref>], whereas in females it can infect the vagina, uterus, vaginal epithelium, uterine fibroblasts, trophoblasts, and endothelial cells from the placenta [<xref rid="B14-pharmaceuticals-12-00101" ref-type="bibr">14</xref>,<xref rid="B16-pharmaceuticals-12-00101" ref-type="bibr">16</xref>]. Therefore, direct human–to–human transmission of ZIKV can occur perinatally [<xref rid="B17-pharmaceuticals-12-00101" ref-type="bibr">17</xref>], sexually [<xref rid="B18-pharmaceuticals-12-00101" ref-type="bibr">18</xref>,<xref rid="B19-pharmaceuticals-12-00101" ref-type="bibr">19</xref>], and through breastfeeding [<xref rid="B20-pharmaceuticals-12-00101" ref-type="bibr">20</xref>,<xref rid="B21-pharmaceuticals-12-00101" ref-type="bibr">21</xref>] or blood transfusion [<xref rid="B22-pharmaceuticals-12-00101" ref-type="bibr">22</xref>,<xref rid="B23-pharmaceuticals-12-00101" ref-type="bibr">23</xref>]. </p><p>To date, there is no vaccine or drug licensed to prevent or treat ZIKV infections. The aim of this review article is to provide an update on the search for anti-ZIKV agents. </p></sec><sec id="sec2-pharmaceuticals-12-00101"><title>2. Genome and Replicative Cycle</title><p>The genome of ZIKV (strain MR 766) comprises a 10.8-kb single-stranded positive-sense RNA molecule that contains approximately a 100-nucleotide 5’ untranslated region (UTR), a single open reading frame (ORF) of 10 kb, and approximately 420 nucleotides in the 3’ UTR (<xref ref-type="fig" rid="pharmaceuticals-12-00101-f001">Figure 1</xref>). The ORF codes for a large polyprotein precursor of 3423 amino acids that is later co- and post-translationally cleaved into three structural (C, prM, and E) and eight nonstructural (NS1, NS2A, NS2B, NS3, S4A, 2K, NS4B, and NS5) proteins (<xref ref-type="fig" rid="pharmaceuticals-12-00101-f001">Figure 1</xref> and <xref rid="pharmaceuticals-12-00101-t001" ref-type="table">Table 1</xref>). </p><p>The structural proteins are responsible for forming the virus particle and are involved in virus entry, assembly, and release of new virions into the host cell. The capsid protein binds the genomic RNA to form the nucleocapsid core, and the E and prM glycoproteins are viral surface proteins attached to the host-derived lipid envelope. </p><p>The non-structural proteins form the viral replication complex inside the host cell [<xref rid="B24-pharmaceuticals-12-00101" ref-type="bibr">24</xref>]. NS3 and NS5 proteins have enzymatic activities. NS3 encodes serine protease [<xref rid="B25-pharmaceuticals-12-00101" ref-type="bibr">25</xref>,<xref rid="B26-pharmaceuticals-12-00101" ref-type="bibr">26</xref>], RNA helicase [<xref rid="B27-pharmaceuticals-12-00101" ref-type="bibr">27</xref>], nucleoside triphosphatase (NTPase) [<xref rid="B28-pharmaceuticals-12-00101" ref-type="bibr">28</xref>], and RNA triphosphatase (RTPase) [<xref rid="B29-pharmaceuticals-12-00101" ref-type="bibr">29</xref>] enzymatic activities. NS3 is well conserved among the Flaviviruses, with amino acid sequence identity of about 65% between ZIKV, WNV, JEV, and YFV. The NS3 protein contains two domains, an N-terminal protease domain and a C-terminal helicase domain, which are connected via a short linker. Due to the multiple roles played by the NS3 protein in virus life cycle, this protein is an attractive target for antiviral drug discovery. NS5 encodes methyl- and guanylyltransferase (MTase and GTase) enzymatic activities as well as an RNA-dependent RNA polymerase (RdRp) [<xref rid="B30-pharmaceuticals-12-00101" ref-type="bibr">30</xref>]. NS2A, NS2B, NS4A, 2K, and NS4B are transmembrane proteins located within the endoplasmic reticulum (ER) membrane [<xref rid="B31-pharmaceuticals-12-00101" ref-type="bibr">31</xref>]. Some regions of NS2B, NS4A, and NS4B also interact with NS3 and thus anchor the replication complex formed by NS3 and NS5 to the ER membrane [<xref rid="B32-pharmaceuticals-12-00101" ref-type="bibr">32</xref>]. Additionally, NS2B serves as an essential cofactor for the NS3 protease and NS4B blocks interferon α/β signaling [<xref rid="B33-pharmaceuticals-12-00101" ref-type="bibr">33</xref>]. NS4A induces ER membrane rearrangements that are involved in forming the viral replication compartments [<xref rid="B34-pharmaceuticals-12-00101" ref-type="bibr">34</xref>] while NS1 is thought to be involved in genome replication by associating with the luminal side of replication compartment and immune evasion through modulation of host defense mechanism [<xref rid="B35-pharmaceuticals-12-00101" ref-type="bibr">35</xref>]. </p><p>The replicative cycle of ZIKV is similar to other known flaviviruses (<xref ref-type="fig" rid="pharmaceuticals-12-00101-f002">Figure 2</xref>). Briefly, the E proteins are involved in the attachment of the virus to receptors on the host membrane, then the virus is internalized via endocytosis [<xref rid="B36-pharmaceuticals-12-00101" ref-type="bibr">36</xref>] mediated by a clathrin protein in a low pH environment. Several cell surface receptors, including the tyrosine-protein kinase receptor AXL, Tyro3, DC-SIGN, and TIM-1, facilitate ZIKV viral entry [<xref rid="B37-pharmaceuticals-12-00101" ref-type="bibr">37</xref>]. The viral genome is released into the host cytoplasm where it is translated, and the resulting polyprotein is proteolytically cleaved into various proteins, the structural and non-structural proteins (C, prM, E and NS proteins) as mentioned above [<xref rid="B38-pharmaceuticals-12-00101" ref-type="bibr">38</xref>,<xref rid="B39-pharmaceuticals-12-00101" ref-type="bibr">39</xref>]. The newly-synthetized (+) RNAs can be either recruited for further rounds of translation/replication or incorporated into the virions, which also initiates their assembly on ER membranes. Assembled virions enter and then travel through the secretory pathway, undergoing maturation along the way, until their final release into the extracellular space. </p></sec><sec id="sec3-pharmaceuticals-12-00101"><title>3. Potential Therapeutic Options for the Treatment of ZIKV Infection</title><p>So far, no specific antiviral is approved for the treatment of ZIKV infections. Acetaminophen is usually used to control fever and pain, anti-histamines are used for pruritic rashes, and fluids to prevent dehydration in ZIKV-infected patients. However, acetylsalicylic acid and non-steroidal anti-inflammatory drugs (NSAIDs) are contraindicated because of an increased risk of hemorrhagic syndrome reported with other flaviviral infections as well as the risk of Reye’s syndrome after viral infection in children and teenagers [<xref rid="B11-pharmaceuticals-12-00101" ref-type="bibr">11</xref>]. </p><p>The current search for ZIKV antiviral options is being conducted through several different approaches which target different steps of the replication cycle: by screening of different compound libraries or by the repurposing of drugs with known active efficacy against other diseases and that are already being used in clinic. In addition, natural products [<xref rid="B40-pharmaceuticals-12-00101" ref-type="bibr">40</xref>,<xref rid="B41-pharmaceuticals-12-00101" ref-type="bibr">41</xref>] as well as antibody-based candidates [<xref rid="B42-pharmaceuticals-12-00101" ref-type="bibr">42</xref>,<xref rid="B43-pharmaceuticals-12-00101" ref-type="bibr">43</xref>] are being evaluated but are outside the scope of this review. Antivirals can be classified according to their mode of action in (i) direct-acting antivirals, directed against viral targets, or (ii) host-targeting antivirals, aimed at targeting cellular components needed for the viral cycle. Therefore, in the last few years, a large number of drugs and therapeutic candidates have been discovered or repurposed with ZIKV activity both in vitro and in pre-clinical studies and a few of them have been evaluated in clinical trials (<xref rid="pharmaceuticals-12-00101-t002" ref-type="table">Table 2</xref>).</p><sec id="sec3dot1-pharmaceuticals-12-00101"><title>3.1. Direct-Acting Antivirals</title><p>Virus-directed drugs are those acting against the viral RNA-dependent RNA polymerase (RdRp) (NS5) catalytic domain, including nucleoside analogs and polymerase inhibitors. They target the methyltransferase catalytic domain of the NS5, responsible for transferring the mRNA cap; the NS2B-NS3 trypsin-like serine protease needed for proper processing of the viral polyprotein; and the NS3 helicase.</p><p>Nucleoside analogs/derivates, which target viral (not cellular polymerases) to terminate viral RNA replication after incorporation into the viral nascent RNA chain, are safe for use in humans [<xref rid="B44-pharmaceuticals-12-00101" ref-type="bibr">44</xref>], because virus-encoded gene products required for RNA replication can significantly differ in substrate specificity from RNA polymerases involved in host cell replication. Consequently, they have been extensively evaluated against ZIKV in cell culture and in animal models. Eyer et al. tested 29 nucleoside analogues at a concentration of 50 µM for their ability to inhibit cytopathic effects (CPE) of ZIKV on Vero cells. They found that five of these compounds (7-deaza-2’-C-methyladenosine (7-deaza-2-CMA), 2’-C-methyladenosine (2-CMA), 2’-C-methylcythydine (2-CMC), 2’-C-methylguanisine (2-CMG), and 2’-C-methyluridine (2-CMU), significantly reduced cell death compared to non-treated ZIKV infected cells with 50% effective concentration (EC<sub>50</sub>) values ranging from 5.3 to 45.5 µM [<xref rid="B45-pharmaceuticals-12-00101" ref-type="bibr">45</xref>]. A similar observation was found when testing the effects of different 2’-C-methylated nucleosides on the in vitro activity of purified recombinant ZIKV RdRp [<xref rid="B46-pharmaceuticals-12-00101" ref-type="bibr">46</xref>]. In addition, the viral polymerase inhibitor 7-deaza-2-CMA compound exhibited anti-ZIKV activity in Vero cells (EC<sub>50</sub> = 9.6 µM), decreasing viremia and delaying morbidity and mortality of ZIKV-infected AG129 (interferon (IFN)-α/β and IFN-γ receptor knockout) mice treated once a day with 50 mg/kg/day of the drug [<xref rid="B47-pharmaceuticals-12-00101" ref-type="bibr">47</xref>]. Although 7-deaza-2-CMA inhibitor failed in human clinical trials for chronic hepatitis C treatment, probably due to mitochondrial toxicity [<xref rid="B48-pharmaceuticals-12-00101" ref-type="bibr">48</xref>], this compound could still be suitable and safe for short-term therapy of acute flaviviral diseases, including WNV [<xref rid="B49-pharmaceuticals-12-00101" ref-type="bibr">49</xref>], and thus represents one of the most promising candidates for the treatment of flaviviral infections to date. Favipiravir (6-fluoro-3-hydroxy-2-pyrazinecarboxamide), originally known as T-705, is a novel antiviral compound that selectively and potently inhibits the RdRp of flavi-, orthomyxo-, alpha-, filo-, bunya-, arena-, calici-, noro-viruses, and other RNA viruses [<xref rid="B50-pharmaceuticals-12-00101" ref-type="bibr">50</xref>]. Although the exact mechanism of the interaction of favipiravir with the RdRp molecule has not been fully elucidated, it is hypothesized that favipiravir may be misincorporated in a nascent viral RNA, or it may act by binding to conserved polymerase domains, thus preventing incorporation of nucleotides for viral RNA replication and transcription. Our group and others have demonstrated the ability of favipiravir to inhibit several geographically and temporally different ZIKV strains in in vitro assays [<xref rid="B51-pharmaceuticals-12-00101" ref-type="bibr">51</xref>,<xref rid="B52-pharmaceuticals-12-00101" ref-type="bibr">52</xref>]. The genetic barrier of resistance against favipiravir has been shown to be high for several viruses. In clinical trials of healthy volunteers and in influenza virus-infected patients, favipiravir has been well tolerated. However, caution is needed because of the teratogenic risks of this molecule [<xref rid="B53-pharmaceuticals-12-00101" ref-type="bibr">53</xref>]. </p><p>A pyrimidine synthesis inhibitor such as NITD008 exhibited antiviral activity against ZIKV in vitro (EC<sub>50</sub> = 0.28–0.95 µM) and in A129 mice treated with 50 mg/kg/day of the drug. Also, 50% of NITD008-treated mice survived without developing any neurological signs [<xref rid="B54-pharmaceuticals-12-00101" ref-type="bibr">54</xref>]. However, due to toxic effects in pre-clinical evaluation, this drug was dismissed [<xref rid="B55-pharmaceuticals-12-00101" ref-type="bibr">55</xref>]. </p><p>The prodrug sofosbuvir is a nucleoside analog that is a RdRp inhibitor commercially available for the treatment of chronic HCV infection. The sofosbuvir phosphoramidate prodrug is converted to its triphosphate analog in the cellular environment to become active. The active metabolite, 2’-fluoro-2-C-methyl-UTP, binds to the active site of NS5 [<xref rid="B56-pharmaceuticals-12-00101" ref-type="bibr">56</xref>] and was shown to inhibit ZIKV infection and replication in human hepatocellular carcinoma (Huh-7) cells, human placental choriocarcinoma (Jar) cells, and SH-Sy5y neuroblastoma cells with EC<sub>50</sub> values in the range of 0.4–5 μM as well as in human fetal-derived hindbrain and cerebral cortex neuronal stem cells (NSCs) with EC<sub>50</sub> of about 32 μM [<xref rid="B56-pharmaceuticals-12-00101" ref-type="bibr">56</xref>,<xref rid="B57-pharmaceuticals-12-00101" ref-type="bibr">57</xref>,<xref rid="B58-pharmaceuticals-12-00101" ref-type="bibr">58</xref>]. However, it did not exhibit anti-ZIKV inhibitory activity in Vero cells. Therefore, the inhibitory activity of sofosbuvir varied among different cell types [<xref rid="B58-pharmaceuticals-12-00101" ref-type="bibr">58</xref>]. Interestingly, sequence analysis of ZIKV isolated from infected cells treated with sofosbuvir showed higher frequency of mutations compared with untreated cells [<xref rid="B58-pharmaceuticals-12-00101" ref-type="bibr">58</xref>] suggesting that, besides its inhibitory effect, the drug also increases the incorporation of mutations in the viral genome, increasing error-prone replication [<xref rid="B59-pharmaceuticals-12-00101" ref-type="bibr">59</xref>]. In wild-type (WT) C57BL/6 mice treated with an anti-IFN-α receptor 1 (IFN-αR1) blocking antibody [<xref rid="B60-pharmaceuticals-12-00101" ref-type="bibr">60</xref>], therapeutic oral administration of sofosbuvir with a physiologically relevant dose of 33 mg/kg/day for seven days, protected the animals against ZIKV-induced weight loss and death in 50% of the treated mice. However, higher concentrations of the drug were not effective and resulted in toxicity [<xref rid="B57-pharmaceuticals-12-00101" ref-type="bibr">57</xref>]. Importantly, in clinical phase II and III studies, sofosbuvir was found to be clinically safe and efficacious in patients treated for HCV infection [<xref rid="B61-pharmaceuticals-12-00101" ref-type="bibr">61</xref>]. Sofosbuvir is a class B drug and can be used in men and non-pregnant women to prevent tissue damage. </p><p>BCX4430, an adenosine nucleoside analog, is a selective inhibitor of the viral RdRp. This compound has already been shown to have broad-spectrum activity against a wide range of RNA viruses including WNV, YFV, Marburg and Ebola viruses [<xref rid="B62-pharmaceuticals-12-00101" ref-type="bibr">62</xref>,<xref rid="B63-pharmaceuticals-12-00101" ref-type="bibr">63</xref>]. BCX4430 acts on NS5 polymerase, promoting chain termination of viral RNA synthesis [<xref rid="B62-pharmaceuticals-12-00101" ref-type="bibr">62</xref>]. It was found to inhibit ZIKV replication in Vero cells with EC<sub>50</sub> values in the range of 3.8–11.7 µg/ml with selective index values of 5.5 and 11.6 depending on the viral strain [<xref rid="B64-pharmaceuticals-12-00101" ref-type="bibr">64</xref>]. In addition, treatment of AG129 mice infected with ZIKV (Malaysian strain, P-6-740) twice daily (BID) with an intramuscular dose of 300 mg/kg of BCX4430 significantly reduced viremia and protected 87.5% of treated mice from mortality. This protection was also observed when treatment was initiated 24 h after infection [<xref rid="B64-pharmaceuticals-12-00101" ref-type="bibr">64</xref>]. This compound is currently in Phase 1 clinical trials to evaluate its safety, tolerability and pharmacokinetics in 94 healthy subjects aged 18–50 years. The results of this study have not been disclosed yet. </p><p>The methyltransferase catalytic domain of the NS5 is responsible for capping the 5’ end of viral genomic RNA. The metal binding pocket of RdRp and SAH/SAM (S-adenosyl-L-homocysteine/S-adenosyl-L-methionine) binding pocket of MTase are classically used in drug screening. Our group has performed virtual screening with a library of 28,341 compounds using a hydrophobic site close to the SAM pocket and identified 10 candidates showing decisive contacts with the MTase. Plaque reduction assay revealed EC<sub>50</sub> values in the range of 4.8–17.6 µM. However, their in vivo efficacy has not yet been evaluated [<xref rid="B65-pharmaceuticals-12-00101" ref-type="bibr">65</xref>]. Hercik et al. reported the crystal structure of the ZIKV methyltransferase in complex with the pan-methyltransferase inhibitor sinefungin, an adenosine derivative, originally isolated from <italic>Streptomyces griseoleus</italic> as a potential antifungal drug [<xref rid="B66-pharmaceuticals-12-00101" ref-type="bibr">66</xref>]. This compound competes with SAM, the natural substrate of numerous MTases [<xref rid="B67-pharmaceuticals-12-00101" ref-type="bibr">67</xref>]. Sinefungin attaches to GTP and GDP analogs and might be useful in enhancing their affinity toward the enzyme for better selectivity and inhibition of ZIKV replication [<xref rid="B68-pharmaceuticals-12-00101" ref-type="bibr">68</xref>]. However, when this drug was used as anti-parasitic agent in studies conducted in dogs and goats, it was toxic, which has hampered its clinical use [<xref rid="B69-pharmaceuticals-12-00101" ref-type="bibr">69</xref>]. </p><p>NS2B-NS3 trypsin-like serine protease plays a key role in virus replication by contributing to viral polyprotein processing. Studies done by Lee et al. identified 10 compounds with inhibitory activity (EC<sub>50</sub> < 50 µM) and binding activity (K<sub>D</sub> of ∼5–10 μM) against the Zika NS2B-NS3 protease from testing 71 HCV NS3/NS4A inhibitors that were initially discovered by high-throughput screening of ∼40,000 compounds [<xref rid="B70-pharmaceuticals-12-00101" ref-type="bibr">70</xref>]. Many natural products such as polyphenols, which have antiviral activity against different viruses (influenza virus, DENV, coronaviruses, HIV-1, hepatitis B virus, etc.) [<xref rid="B71-pharmaceuticals-12-00101" ref-type="bibr">71</xref>,<xref rid="B72-pharmaceuticals-12-00101" ref-type="bibr">72</xref>,<xref rid="B73-pharmaceuticals-12-00101" ref-type="bibr">73</xref>], have been tested against NS2B-NS3 protease, and some of them have been found to inhibit ZIKV protease activity. Lim et al. evaluated 22 polyphenol compounds and found that seven had an EC<sub>50</sub> ranging from 22 to 113 μM [<xref rid="B74-pharmaceuticals-12-00101" ref-type="bibr">74</xref>]. Roy et al. identified five flavonoids (myricetin, quercetin, luteolin, isorhamnetin, apigenin) and one natural phenol (curcumin) which were shown to inhibit Zika NS2B-NS3 protease by binding to a pocket on the back of the active site and allosterically affect the structure-activity property of Zika NS2B-NS3 protease. The EC<sub>50</sub> from the flavonoids ranged between 1.3 and 56.3 μM whereas the curcumin EC<sub>50</sub> was 3.5 μM [<xref rid="B75-pharmaceuticals-12-00101" ref-type="bibr">75</xref>]. Another group screened a total of 2816 Food and Drug Administration (FDA)-approved drugs and investigational drugs and found that 23 compounds had EC<sub>50</sub> below 15 μM. However, 12 of those compounds were considered Pan-Assay Interference Compounds (PAINS). Three (temoporfin, niclosamide, and nitazoxanide) of the 12 remaining compounds had an EC<sub>50</sub> value ranging from 1.1 to 15.9 μM. Temoporfin displayed a very low EC<sub>50</sub> value (nanomolar range) and, when tested in a lethal mouse model, was able to inhibit viremia and protect 83% of infected mice. In addition, mice that survived did not present any signs of neurological disorder [<xref rid="B76-pharmaceuticals-12-00101" ref-type="bibr">76</xref>]. Similarly, a study done by Yuan et al. using an in-silico structure-based approach to rapidly screen a large chemical library of 8277 compounds, successfully identified eight clinically approved drugs with inhibitory activity on the ZIKV NS2B-NS3 protease [<xref rid="B77-pharmaceuticals-12-00101" ref-type="bibr">77</xref>]. In addition, the authors further validated the anti-ZIKV activity of novobiocin, an aminocoumarin antibiotic, using in vitro antiviral assays and in an immunodeficient mouse model. In vitro, novobiocin had an EC<sub>50</sub> value of 24.82 μM and treatment of mice with 100 mg/kg of the drug BID from day 1 to 13 post-infection, significantly (<italic>p</italic> < 0.05) increased survival rate (100% vs. 0%), decreased mean blood and tissue viral loads, and produced less severe histopathological changes than untreated controls [<xref rid="B77-pharmaceuticals-12-00101" ref-type="bibr">77</xref>]. </p><p>NS3 helicases display adenosine triphosphatase (ATPase) and RNA triphosphatase (RTPase) activities. NS3 inhibitors can be used to impede ZIKV infection. Suramin, an anti-parasitic drug used to treat trypanosomal human sleeping sickness, is available for prophylactic and therapeutic use in children. This drug was also shown to inhibit multiple DNA and RNA viruses including DENV, herpes simplex virus type 1, cytomegaloviruses human hepatitis B, hepatitis D, hepatitis C, bunyaviruses, enterovirus 71, and others [<xref rid="B78-pharmaceuticals-12-00101" ref-type="bibr">78</xref>,<xref rid="B79-pharmaceuticals-12-00101" ref-type="bibr">79</xref>,<xref rid="B80-pharmaceuticals-12-00101" ref-type="bibr">80</xref>,<xref rid="B81-pharmaceuticals-12-00101" ref-type="bibr">81</xref>]. Suramin was also able to inhibit enterovirus 71 by neutralizing virus particles prior to attachment and chikungunya virus in mice [<xref rid="B82-pharmaceuticals-12-00101" ref-type="bibr">82</xref>,<xref rid="B83-pharmaceuticals-12-00101" ref-type="bibr">83</xref>,<xref rid="B84-pharmaceuticals-12-00101" ref-type="bibr">84</xref>]. Albulescu et al. showed that suramin has anti-ZIKV activity, with an EC<sub>50</sub> of 39.8 μM, by interfering with viral attachment and the release of infectious progeny from ZIKV-infected cells [<xref rid="B85-pharmaceuticals-12-00101" ref-type="bibr">85</xref>]. When treatment was initiated post-entry, viral RNA synthesis was unaffected but both the release of genomes and the infectivity of ZIKV were reduced, suggesting that this drug also affects virus biogenesis probably by interfering with glycosylation and maturation of ZIKV during traffic through the secretory pathway [<xref rid="B85-pharmaceuticals-12-00101" ref-type="bibr">85</xref>]. </p></sec><sec id="sec3dot2-pharmaceuticals-12-00101"><title>3.2. Host-Targeting Antivirals</title><p>Targeting host cell processes provides an attractive broad-spectrum strategy because they are often employed by multiple viruses and, in addition, they are less prone to develop drug resistance [<xref rid="B86-pharmaceuticals-12-00101" ref-type="bibr">86</xref>]. These host-acting inhibitors can be directed to any molecule or pathway implicated in the different steps of the viral life cycle, from binding, entry and fusion, to the formation of the replication complex, viral maturation, and egress. </p><p>In order to maintain proper replication, viruses rely on the supply of nucleosides from the host cells. Ribavirin is a guanosine analogue that has broad-spectrum activity against several RNA and DNA viruses [<xref rid="B87-pharmaceuticals-12-00101" ref-type="bibr">87</xref>,<xref rid="B88-pharmaceuticals-12-00101" ref-type="bibr">88</xref>]. Different mechanisms have been proposed to explain ribavirin’s antiviral properties including indirect mechanisms such as inosine monophosphate dehydrogenase inhibition (IMPDH) and immunomodulatory effects as well as direct mechanisms such as interference with RNA capping, polymerase inhibition, and lethal mutagenesis [<xref rid="B87-pharmaceuticals-12-00101" ref-type="bibr">87</xref>]. This antiviral is usually employed in combination therapies to treat chronic HCV infections. Our group and others demonstrated the inhibitory activity of ribavirin against ZIKV strains of different geographic origins in several cell lines such as Vero cells, human neural progenitor cells (hNPCs), human dermal fibroblasts (HDFs), and human lung adenocarcinoma cells (A549) [<xref rid="B51-pharmaceuticals-12-00101" ref-type="bibr">51</xref>,<xref rid="B89-pharmaceuticals-12-00101" ref-type="bibr">89</xref>]. Ribavirin was also shown to suppress viremia in ZIKV-infected STAT-1-deficient mice, which lack type I IFN signaling and are thus highly sensitive to ZIKV infection with a lethal outcome [<xref rid="B89-pharmaceuticals-12-00101" ref-type="bibr">89</xref>]. Recent studies have shown that merimepodib (MMPD or VX-497) and mycophenolic acid (MPA), two IMPDH inhibitors, also inhibit ZIKV-RNA replication in different cell types, including Huh-7 cells, human cervical placental cells, and neural stem and primary amniotic cells [<xref rid="B90-pharmaceuticals-12-00101" ref-type="bibr">90</xref>,<xref rid="B91-pharmaceuticals-12-00101" ref-type="bibr">91</xref>,<xref rid="B92-pharmaceuticals-12-00101" ref-type="bibr">92</xref>]. Azathioprine, another inhibitor of the purine synthesis and immunosuppressive compound, was shown to abolish ZIKV replication in HeLa (cervical cancer cells) and JEG3 (human choriocarcinoma cell line) cells; however, its use in pregnant women is not recommended [<xref rid="B92-pharmaceuticals-12-00101" ref-type="bibr">92</xref>].</p><p>Similar to the purine synthesis inhibitors, compounds inhibiting the synthesis of pyrimidines have also been shown to affect ZIKV replication. Pascoalino et al. screened a library of 725 compounds from a collection of chemically diverse FDA-approved drugs with known and unknown mechanisms of action. The entire library was screened at 20 µM against ZIKV infecting Huh7 cells. The authors identified the 6-azauridine (EC<sub>50</sub> = 2.3 μM) and another pyrimidine biosynthesis inhibitor, 5-fluorouracil (EC<sub>50</sub> = 14.3 μM), which inhibit thymidylate synthase (the enzyme that catalyzes the final step of thymidine biosynthesis) [<xref rid="B93-pharmaceuticals-12-00101" ref-type="bibr">93</xref>]. These compounds are classified in pregnancy category D by the FDA [<xref rid="B92-pharmaceuticals-12-00101" ref-type="bibr">92</xref>] and thus have human fetal risk which is not unexpected because they deplete the cellular pool of nucleotides, affecting proper development of the fetus. In addition, the authors have identified lovastatin, a 3-hydroxy-3-methylglutaryl-coenzyme (HMG-CoA) reductase inhibitor, whose activity against ZIKV was confirmed through a dose-response assay (EC<sub>50</sub> = 20.7 μM) [<xref rid="B93-pharmaceuticals-12-00101" ref-type="bibr">93</xref>]. The antiflaviviral activity of lovastatin was also demonstrated against HCV and DENV [<xref rid="B94-pharmaceuticals-12-00101" ref-type="bibr">94</xref>,<xref rid="B95-pharmaceuticals-12-00101" ref-type="bibr">95</xref>]. In addition, Sarkey et al., demonstrated that a short-term parenteral course of high-dose lovastatin in mice markedly attenuated nervous system injury and, thus, could be eventually used in inflammatory peripheral nerve diseases such as Guillain–Barré syndrome (GBS), a consequence of ZIKV infection [<xref rid="B96-pharmaceuticals-12-00101" ref-type="bibr">96</xref>]. </p><p>Retallack et al. performed the screening of 2177 clinically approved compounds by monitoring inhibition of virus-dependent cell death at 72 h post-infection (hpi) in Vero cells. The screening identified several compounds that rescued cell viability, including antibiotics and inhibitors of nucleotide and protein synthesis with many that showed toxicity in Vero or U87 cells or were contraindicated during pregnancy. However, they identified the macrolide antibiotic azithromycin, which rescued ZIKV-induced cytopathic effect in glial cells with low toxicity and reduced ZIKV infection of U87 cells at an EC<sub>50</sub> of 2 to 3 µM [<xref rid="B97-pharmaceuticals-12-00101" ref-type="bibr">97</xref>]. This drug is generally safe during pregnancy [<xref rid="B98-pharmaceuticals-12-00101" ref-type="bibr">98</xref>] and was suggested as a potential option to prevent GBS and microcephaly [<xref rid="B97-pharmaceuticals-12-00101" ref-type="bibr">97</xref>].</p><p>Chloroquine, an anti-inflammatory FDA-approved 4-aminoquinoline, is an old antimalarial drug which can be prescribed to pregnant women at risk of exposure to <italic>Plasmodium</italic> parasites [<xref rid="B99-pharmaceuticals-12-00101" ref-type="bibr">99</xref>,<xref rid="B100-pharmaceuticals-12-00101" ref-type="bibr">100</xref>]. This drug has shown antiviral activity against several viruses, through the inhibition of pH-dependent steps of viral replication, including anti-ZIKV activity in Vero cells, human brain microvascular endothelial cells (hBMECs), and human neural stem cells (NSCs) with EC<sub>50</sub> values of 9.82, 14.2, and 12.36 μM, respectively. In addition, chloroquine was able to partially reverse morphological changes induced by ZIKV in mouse neurospheres [<xref rid="B101-pharmaceuticals-12-00101" ref-type="bibr">101</xref>]. In vitro, chloroquine reduces the number of ZIKV-infected cells, and inhibits virus production and cell death promoted by ZIKV infection without cytotoxic effects [<xref rid="B101-pharmaceuticals-12-00101" ref-type="bibr">101</xref>]. </p><p>Saliphenylhalamide (SaliPhe), a viral entry blocker which targets vacuolar ATPase and prevents the acidification of endosomes, also inhibits ZIKV replication in human retinal pigment epithelial (RPE) cells, which are natural targets for ZIKV infection [<xref rid="B102-pharmaceuticals-12-00101" ref-type="bibr">102</xref>] with an EC<sub>50</sub> of 1 μM [<xref rid="B103-pharmaceuticals-12-00101" ref-type="bibr">103</xref>]. Similarly, obatoclax mesylate, also known as GX15-070, is an experimental drug for the treatment of different types of cancer. This drug is an inhibitor of the Bcl-2 family of proteins that targets cellular Mcl-1 and inhibits endocytosis, thus inducing apoptosis. Obatoclax mesylate displays an EC<sub>50</sub> of 0.3 μM against ZIKV. Niclosamide is an FDA-approved drug, formerly designated in pregnancy category B, that has been used for more than 50 years showing acceptable safety. It has been broadly used in the treatment of intestinal helminthiasis. This drug blocks the acidification of endosomes, using a mechanism that has not yet been fully elucidated [<xref rid="B104-pharmaceuticals-12-00101" ref-type="bibr">104</xref>]. In glioblastoma SNB-19 cells, the EC<sub>50</sub> against ZIKV was 0.37 μM based on the measurement of intracellular viral RNA [<xref rid="B105-pharmaceuticals-12-00101" ref-type="bibr">105</xref>]. PHA-690509, is an investigational cyclin-dependent kinase inhibitor which inhibited ZIKV infection with an EC<sub>50</sub> value of 1.72 μM [<xref rid="B105-pharmaceuticals-12-00101" ref-type="bibr">105</xref>]. This drug was detected by Xu et al. as part of a large drug repurposing screen for ZIKV. The authors measured ZIKV-induced caspase-3 activity and cell viability from over 6000 approved drugs and drug candidate compounds using human neural cells. This study led to the identification of small molecules that either protect against cell death in multiple neural cell types or inhibit ZIKV replication. Among them, seliciclib (a purine analog) and RGB-286147 inhibited ZIKV infection at sub-micromolar concentrations [<xref rid="B105-pharmaceuticals-12-00101" ref-type="bibr">105</xref>]. </p><p>Studies from Costa et al. showed that ZIKV has tropism for the central nervous system (CNS) and replicates preferentially in neurons, inducing neurodegeneration, neuroinflammation, and ophthalmologic disorders [<xref rid="B106-pharmaceuticals-12-00101" ref-type="bibr">106</xref>]. Neurodegeneration in ZIKV disease possibly occurs due to the excitotoxicity of glutamate. FDA-approved <italic>N</italic>-methyl-D-aspartate receptor (NMDAR) antagonistic drugs to treat Alzheimer disease such as memantine, MK-801, agmatine, and ifenprodil were found to prevent neuronal cell death caused by ZIKV under in vitro conditions without reducing viral titers [<xref rid="B106-pharmaceuticals-12-00101" ref-type="bibr">106</xref>]. Blocking hyperactivation of NMDAR would therefore reduce rates of Zika virus-induced cell death and help ameliorate neuronal symptoms during infection. Costa et al. showed that memantine was very effective at preventing ZIKV-induced neuronal cell death and neurodegeneration in IFN-α/βR<sup>−/−</sup>mice [<xref rid="B106-pharmaceuticals-12-00101" ref-type="bibr">106</xref>]. Importantly, memantine is also listed in pregnancy category B drugs by the FDA. Therefore, it could be used safely to reduce neurological complications associated with ZIKV infection. </p></sec></sec><sec id="sec4-pharmaceuticals-12-00101"><title>4. Who Benefits from ZIKV Therapies?</title><p>In immunocompetent individuals, ZIKV infection is asymptomatic or produces a relatively mild illness with an uneventful recovery that can be treated with acetaminophen, anti-histamines, and fluids. However, due to the ability of ZIKV to infect fetuses and cause severe neurological disease, there is a need for anti-zika drugs that function during pregnancy and which are safe for both the pregnant mother and her fetus. Many FDA approved drugs have been tested for efficacy against ZIKV and can be repurposed for treating ZIKV infection in humans. In order to reach the fetus, these drugs must be able to cross the placental barrier and the blood–brain barrier to reach neural cells, the main targets of ZIKV. So far, however, no drug has been identified that is clinically safe for use in both pregnant women and fetus. The World Health Organization (WHO) recommends that niclosamide may be used during pregnancy as an anthelminthic agent (with anti-ZIKV activity) because it has not been shown to be mutagenic, teratogenic or embryotoxic (<uri xlink:href="http://apps.who.int/medicinedocs/en/d/Jh2922e/3.1.3.html#Jh2922e.3.1.3">http://apps.who.int/medicinedocs/en/d/Jh2922e/3.1.3.html#Jh2922e.3.1.3</uri>). The US Centers for Disease Control and Prevention (CDC) further recommend that “for individual patients in clinical settings, the risk of treatment with niclosamide in pregnant women who are known to have an infection needs to be balanced with the risk of disease progression in the absence of treatment” (<uri xlink:href="http://www.cdc.gov/parasites/hymenolepis/health_professionals/">http://www.cdc.gov/parasites/hymenolepis/health_professionals/</uri>). In addition, niclosamide and other direct- or indirect-acting agents could be used to reduce viral load in infected men and nonpregnant women (potentially those at higher risk due to immunosuppression), reducing transmission and potentially preventing Guillain–Barré syndrome and other ZIKV-related neurological complications in humans. </p></sec><sec sec-type="conclusions" id="sec5-pharmaceuticals-12-00101"><title>5. Conclusions</title><p>In the last few years, researchers have invested efforts in the development of a vaccine and antiviral drugs for the prevention or treatment of ZIKV infections. However, there is still no approved vaccine or drug available for this emerging pathogen. Different approaches and methodologies have been used, from testing specific drugs with known antiviral activity for other viruses, to testing libraries composed of hundreds or thousands of bioactive compounds that have already gone through several steps of drug approval by regulatory agencies (repurposing drugs). Most antiviral candidates have been evaluated in vitro and some of them have also been tested in animal models. However, few candidates have advanced into clinical trials. Further development of novel compounds as well as combination therapies may open new avenues for the treatment of ZIKV-related diseases. </p></sec></body><back><notes><title>Author Contributions</title><p>M.B. wrote the manuscript. 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Med.</source><year>2016</year><volume>22</volume><fpage>1101</fpage><lpage>1107</lpage><pub-id pub-id-type="doi">10.1038/nm.4184</pub-id><pub-id pub-id-type="pmid">27571349</pub-id></element-citation></ref><ref id="B106-pharmaceuticals-12-00101"><label>106.</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Costa</surname><given-names>V.V.</given-names></name><name><surname>Del Sarto</surname><given-names>J.L.</given-names></name><name><surname>Rocha</surname><given-names>R.F.</given-names></name><name><surname>Silva</surname><given-names>F.R.</given-names></name><name><surname>Doria</surname><given-names>J.G.</given-names></name><name><surname>Olmo</surname><given-names>I.G.</given-names></name><name><surname>Marques</surname><given-names>R.E.</given-names></name><name><surname>Queiroz-Junior</surname><given-names>C.M.</given-names></name><name><surname>Foureaux</surname><given-names>G.</given-names></name><name><surname>Araujo</surname><given-names>J.M.S.</given-names></name><etal></etal></person-group><article-title>N-Methyl-d-Aspartate (NMDA) Receptor Blockade Prevents Neuronal Death Induced by Zika Virus Infection</article-title><source>mBio</source><year>2017</year><volume>8</volume><pub-id pub-id-type="doi">10.1128/mBio.00350-17</pub-id><pub-id pub-id-type="pmid">28442607</pub-id></element-citation></ref></ref-list></back><floats-group><fig id="pharmaceuticals-12-00101-f001" orientation="portrait" position="float"><label>Figure 1</label><caption><p>Detailed structure of Zika virus (ZIKV) genome. ZIKV genomic RNA is capped but lacks poly A tail. The viral RNA codes for a polyprotein that is co-translationally cleaved to yield 11 proteins: three structural proteins (C prM/M and E) and eight non-structural proteins (NS1, NS2A, NS2B, NS3, NS4A, 2K, NS4B, and NS5).</p></caption><graphic xlink:href="pharmaceuticals-12-00101-g001"></graphic></fig><fig id="pharmaceuticals-12-00101-f002" orientation="portrait" position="float"><label>Figure 2</label><caption><p>Zika virus life cycle. ZIKV, an enveloped RNA virus, enters cells by receptor-mediated endocytosis and fuses its membranes by an acidic-pH-triggered mechanism in the endosome (via cell surface receptors such as AXL, Tyro3, DC-SIGN and TIM-1) to release the viral RNA. The ssRNA is then translated, and the resulting polyprotein is further cleaved into various structural and non-structural proteins (C, prM, E and NS proteins). Replication takes place in the endoplasmic reticulum (ER) surface. Transcription and replication of the dsDNA results in the formation of new viral mRNA and ssRNA, respectively. Virus assembly takes place in the ER membrane and leads to the formation of immature virions, which are transported through the exocytic pathway. The prM protein is cleaved and the virus is rendered mature. Finally, the mature virus exits the cell via exocytosis.</p></caption><graphic xlink:href="pharmaceuticals-12-00101-g002"></graphic></fig><table-wrap id="pharmaceuticals-12-00101-t001" orientation="portrait" position="float"><object-id pub-id-type="pii">pharmaceuticals-12-00101-t001_Table 1</object-id><label>Table 1</label><caption><p>The table shows the structural and nonstructural ZIKV proteins from the 5’ to the 3’ untranslated regions. The name, size in amino acids, and function are shown for each protein.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Name</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Amino Acid Residues</th><th align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1" colspan="1">Function</th></tr></thead><tbody><tr><td align="center" valign="middle" rowspan="1" colspan="1">C</td><td align="center" valign="middle" rowspan="1" colspan="1">122</td><td align="center" valign="middle" rowspan="1" colspan="1">Generation of nucleocapsid (encapsulates genomic RNA)</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">prM</td><td align="center" valign="middle" rowspan="1" colspan="1">168</td><td align="center" valign="middle" rowspan="1" colspan="1">Protects E protein during assembly</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">E</td><td align="center" valign="middle" rowspan="1" colspan="1">500</td><td align="center" valign="middle" rowspan="1" colspan="1">Envelope glycoprotein (membrane binding and fusion)</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">NS1</td><td align="center" valign="middle" rowspan="1" colspan="1">352</td><td align="center" valign="middle" rowspan="1" colspan="1">Replication and immune response regulation</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">NS2A</td><td align="center" valign="middle" rowspan="1" colspan="1">226</td><td align="center" valign="middle" rowspan="1" colspan="1">Replication and capsid assembly</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">NS2B</td><td align="center" valign="middle" rowspan="1" colspan="1">130</td><td align="center" valign="middle" rowspan="1" colspan="1">NS3 cofactor</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">NS3</td><td align="center" valign="middle" rowspan="1" colspan="1">617</td><td align="center" valign="middle" rowspan="1" colspan="1">Serine protease NTPase, RNA helicase</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">NS4A</td><td align="center" valign="middle" rowspan="1" colspan="1">127</td><td align="center" valign="middle" rowspan="1" colspan="1">Viral membrane formation</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">2K</td><td align="center" valign="middle" rowspan="1" colspan="1">23</td><td align="center" valign="middle" rowspan="1" colspan="1">Signal peptide</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">NS4B</td><td align="center" valign="middle" rowspan="1" colspan="1">251</td><td align="center" valign="middle" rowspan="1" colspan="1">Inhibits antiviral state</td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">NS5</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">903</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">RNA dependent RNA polymerase</td></tr></tbody></table></table-wrap><table-wrap id="pharmaceuticals-12-00101-t002" orientation="portrait" position="float"><object-id pub-id-type="pii">pharmaceuticals-12-00101-t002_Table 2</object-id><label>Table 2</label><caption><p>Summary of the different antiviral options described in this manuscript.</p></caption><table frame="hsides" rules="groups"><tbody><tr><td colspan="4" align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1"><bold>Direct-Acting Antivirals</bold></td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><bold>Name</bold></td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><bold>Mode of action</bold></td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><bold>In vitro</bold></td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><bold>In vivo</bold></td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">7-deaza-2-CMA</td><td align="center" valign="middle" rowspan="1" colspan="1">RdRp inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">2-CMA, 2-CMC, 2-CMG, 2-CMU</td><td align="center" valign="middle" rowspan="1" colspan="1">RdRp inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Favipiravir</td><td align="center" valign="middle" rowspan="1" colspan="1">RdRp inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">NITD008</td><td align="center" valign="middle" rowspan="1" colspan="1">Pyrimidine synthesis inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Sofosbuvir</td><td align="center" valign="middle" rowspan="1" colspan="1">RdRp inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">BCX4430 *</td><td align="center" valign="middle" rowspan="1" colspan="1">RdRp inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Sinefungin</td><td align="center" valign="middle" rowspan="1" colspan="1">Pan-methyltransferase inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Myricetin, quercetin, luteolin, isorhamnetin, apigenin, curcumin</td><td align="center" valign="middle" rowspan="1" colspan="1">NS2B-NS3 protease inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Niclosamide, and nitazoxanide</td><td align="center" valign="middle" rowspan="1" colspan="1">NS2B-NS3 protease inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Temoporfin</td><td align="center" valign="middle" rowspan="1" colspan="1">NS2B-NS3 protease inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Novobiocin</td><td align="center" valign="middle" rowspan="1" colspan="1">NS2B-NS3 protease inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Suramin</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">NS3 inhibitor</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">√</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">X</td></tr><tr><td colspan="4" align="center" valign="middle" style="border-bottom:solid thin" rowspan="1"><bold>Host-Targeting Antivirals</bold></td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><bold>Name</bold></td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><bold>Mode of action</bold></td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><bold>In vitro</bold></td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1"><bold>In vivo</bold></td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Ribavirin</td><td align="center" valign="middle" rowspan="1" colspan="1">Several mechanisms including purine synthesis inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Merimepodib and mycophenolic acid</td><td align="center" valign="middle" rowspan="1" colspan="1">Inosine monophosphate dehydrogenase (IMPDH) inhibitors</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Azathioprine</td><td align="center" valign="middle" rowspan="1" colspan="1">Purine synthesis inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">6-azauridine, 5-fluorouracil</td><td align="center" valign="middle" rowspan="1" colspan="1">Pirimidine synthesis inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">lovastatin</td><td align="center" valign="middle" rowspan="1" colspan="1">HMG-CoA reductase inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Azithromycin</td><td align="center" valign="middle" rowspan="1" colspan="1">Unknown mechanisms of action against ZIKV</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Chloroquine</td><td align="center" valign="middle" rowspan="1" colspan="1">Inhibition of pH-dependent steps of viral replication</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Saliphenylhalamide</td><td align="center" valign="middle" rowspan="1" colspan="1">Viral entry inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">Obatoclax mesylate (GX15-070)</td><td align="center" valign="middle" rowspan="1" colspan="1">Bcl-2 protein inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">PHA-690509</td><td align="center" valign="middle" rowspan="1" colspan="1">Cyclin-dependent kinase inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" rowspan="1" colspan="1">MK-801, agmatine, and ifenprodil</td><td align="center" valign="middle" rowspan="1" colspan="1">Neuronal cell death inhibitor</td><td align="center" valign="middle" rowspan="1" colspan="1">√</td><td align="center" valign="middle" rowspan="1" colspan="1">X</td></tr><tr><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Memantine</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">Neuronal cell death inhibitor</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">√</td><td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">√</td></tr></tbody></table><table-wrap-foot><fn><p>* Denotes drugs under clinical trials, X: not done. 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