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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Perspectives on therapeutic neutralizing antibodies against the Novel Coronavirus SARS-CoV-2</title><author><name sortKey="Zhou, Guangyu" sort="Zhou, Guangyu" uniqKey="Zhou G" first="Guangyu" last="Zhou">Guangyu Zhou</name><affiliation><nlm:aff id="A1">Faculty of Health Sciences, University of Macau, Taipa, Macau SPR, China.</nlm:aff></affiliation><affiliation><nlm:aff id="A2">Institute of Translational Medicine, University of Macau, Taipa, Macau SPR, China.</nlm:aff></affiliation></author><author><name sortKey="Zhao, Qi" sort="Zhao, Qi" uniqKey="Zhao Q" first="Qi" last="Zhao">Qi Zhao</name><affiliation><nlm:aff id="A1">Faculty of Health Sciences, University of Macau, Taipa, Macau SPR, China.</nlm:aff></affiliation><affiliation><nlm:aff id="A2">Institute of Translational Medicine, University of Macau, Taipa, Macau SPR, China.</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">32226289</idno><idno type="pmc">7098029</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7098029</idno><idno type="RBID">PMC:7098029</idno><idno type="doi">10.7150/ijbs.45123</idno><date when="2020">2020</date><idno type="wicri:Area/Pmc/Corpus">001796</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">001796</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Perspectives on therapeutic neutralizing antibodies against the Novel Coronavirus SARS-CoV-2</title><author><name sortKey="Zhou, Guangyu" sort="Zhou, Guangyu" uniqKey="Zhou G" first="Guangyu" last="Zhou">Guangyu Zhou</name><affiliation><nlm:aff id="A1">Faculty of Health Sciences, University of Macau, Taipa, Macau SPR, China.</nlm:aff></affiliation><affiliation><nlm:aff id="A2">Institute of Translational Medicine, University of Macau, Taipa, Macau SPR, China.</nlm:aff></affiliation></author><author><name sortKey="Zhao, Qi" sort="Zhao, Qi" uniqKey="Zhao Q" first="Qi" last="Zhao">Qi Zhao</name><affiliation><nlm:aff id="A1">Faculty of Health Sciences, University of Macau, Taipa, Macau SPR, China.</nlm:aff></affiliation><affiliation><nlm:aff id="A2">Institute of Translational Medicine, University of Macau, Taipa, Macau SPR, China.</nlm:aff></affiliation></author></analytic><series><title level="j">International Journal of Biological Sciences</title><idno type="eISSN">1449-2288</idno><imprint><date when="2020">2020</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>A newly identified novel coronavirus (SARS-CoV-2) is causing pneumonia-associated respiratory syndrome across the world. Epidemiology, genomics, and pathogenesis of the SARS-CoV-2 show high homology with that of SARS-CoV. Current efforts are focusing on development of specific antiviral drugs. Therapeutic neutralizing antibodies (NAbs) against SARS-CoV-2 will be greatly important therapeutic agents for the treatment of coronavirus disease 2019 (COVID-19). Herein, the host immune responses against SARS-CoV discussed in this review provide implications for developing NAbs and understanding clinical interventions against SARS-CoV-2. Further, we describe the benefits, challenges and considerations of NAbs against SARS-CoV-2. Although many challenges exist, NAbs still offer a therapeutic option to control the current pandemic and the possible re-emergence of the virus in the future, and their development therefore remains a high priority.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Zhu, N" uniqKey="Zhu N">N Zhu</name></author><author><name sortKey="Zhang, D" uniqKey="Zhang D">D Zhang</name></author><author><name sortKey="Wang, W" uniqKey="Wang W">W Wang</name></author><author><name sortKey="Li, X" uniqKey="Li X">X Li</name></author><author><name sortKey="Yang, B" uniqKey="Yang B">B Yang</name></author><author><name sortKey="Song, J" uniqKey="Song J">J Song</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Lu, R" uniqKey="Lu R">R Lu</name></author><author><name sortKey="Zhao, X" uniqKey="Zhao X">X Zhao</name></author><author><name sortKey="Li, J" uniqKey="Li J">J Li</name></author><author><name sortKey="Niu, P" 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Int J Biol Sci</journal-id><journal-id journal-id-type="iso-abbrev">Int. J. Biol. Sci</journal-id><journal-id journal-id-type="publisher-id">ijbs</journal-id><journal-title-group><journal-title>International Journal of Biological Sciences</journal-title></journal-title-group><issn pub-type="epub">1449-2288</issn><publisher><publisher-name>Ivyspring International Publisher</publisher-name><publisher-loc>Sydney</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">32226289</article-id><article-id pub-id-type="pmc">7098029</article-id><article-id pub-id-type="doi">10.7150/ijbs.45123</article-id><article-id pub-id-type="publisher-id">ijbsv16p1718</article-id><article-categories><subj-group subj-group-type="heading"><subject>Review</subject></subj-group></article-categories><title-group><article-title>Perspectives on therapeutic neutralizing antibodies against the Novel Coronavirus SARS-CoV-2</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Zhou</surname><given-names>Guangyu</given-names></name><xref ref-type="aff" rid="A1">1</xref><xref ref-type="aff" rid="A2">2</xref></contrib><contrib contrib-type="author"><name><surname>Zhao</surname><given-names>Qi</given-names></name><xref ref-type="aff" rid="A1">1</xref><xref ref-type="aff" rid="A2">2</xref><xref ref-type="corresp" rid="FNA_envelop">✉</xref></contrib></contrib-group><aff id="A1"><label>1</label>Faculty of Health Sciences, University of Macau, Taipa, Macau SPR, China.</aff><aff id="A2"><label>2</label>Institute of Translational Medicine, University of Macau, Taipa, Macau SPR, China.</aff><author-notes><corresp id="FNA_envelop">✉ Corresponding author: Qi Zhao. E-mail: <email>qizhao@um.edu.mo</email>; <email>zhaoqi@alumni.cuhk.net</email>. Tel: 853-88224824. ORCID: 0000-0002-5969-6407.</corresp><fn fn-type="COI-statement"><p>Competing Interests: The authors have declared that no competing interest exists.</p></fn></author-notes><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>15</day><month>3</month><year>2020</year></pub-date><volume>16</volume><issue>10</issue><fpage>1718</fpage><lpage>1723</lpage><history><date date-type="received"><day>20</day><month>2</month><year>2020</year></date><date date-type="accepted"><day>1</day><month>3</month><year>2020</year></date></history><permissions><copyright-statement>© The author(s)</copyright-statement><copyright-year>2020</copyright-year><license license-type="open-access"><license-p>This is an open access article distributed under the terms of the Creative Commons Attribution License (<ext-link ext-link-type="uri" xlink:href="https://creativecommons.org/licenses/by/4.0/">https://creativecommons.org/licenses/by/4.0/</ext-link>). See <ext-link ext-link-type="uri" xlink:href="http://ivyspring.com/terms">http://ivyspring.com/terms</ext-link> for full terms and conditions.</license-p></license></permissions><abstract><p>A newly identified novel coronavirus (SARS-CoV-2) is causing pneumonia-associated respiratory syndrome across the world. Epidemiology, genomics, and pathogenesis of the SARS-CoV-2 show high homology with that of SARS-CoV. Current efforts are focusing on development of specific antiviral drugs. Therapeutic neutralizing antibodies (NAbs) against SARS-CoV-2 will be greatly important therapeutic agents for the treatment of coronavirus disease 2019 (COVID-19). Herein, the host immune responses against SARS-CoV discussed in this review provide implications for developing NAbs and understanding clinical interventions against SARS-CoV-2. Further, we describe the benefits, challenges and considerations of NAbs against SARS-CoV-2. Although many challenges exist, NAbs still offer a therapeutic option to control the current pandemic and the possible re-emergence of the virus in the future, and their development therefore remains a high priority.</p></abstract><kwd-group><kwd>Neutralizing antibody</kwd><kwd>SARS-CoV-2</kwd><kwd>COVID-19</kwd><kwd>severe acute respiratory syndrome</kwd></kwd-group></article-meta></front><body><sec sec-type="intro"><title>Introduction</title><p>The occurrence of coronavirus disease 2019 (COVID-19) cases in Wuhan city, Hubei province of China firstly emerged in December 2019. A newly identified novel coronavirus (SARS-CoV-2, formerly known as 2019-nCoV) is causing pneumonia-associated respiratory syndrome <xref rid="B1" ref-type="bibr">1</xref>. After analysis of genome sequences of SARS-CoV-2 samples obtained from different infected patients, SARS-CoV-2 shares high sequence identity with SARS-CoV <xref rid="B2" ref-type="bibr">2</xref>. Compared to SARS-CoV, transmitted from human-to-human of SARS-CoV-2 seems to be greater. As of February 2020, at least 25 countries reported >70,000 cases of SARS-CoV-2 infection. Patients infected with SARS-CoV-2 show typical pneumonia and severe lung damage <xref rid="B3" ref-type="bibr">3</xref>. COVID-19 can be diagnosed by either clinical CT radiography or a laboratory real time Reverse Transcription-Polymerase Chain Reaction (RT-PCR) <xref rid="B4" ref-type="bibr">4</xref>. Unfortunately, there are no specific antiviral drugs or vaccines currently. Several approaches can be suggested to control infections of SARS-CoV-2, including vaccines, monoclonal antibodies, oligonucleotides, peptides, interferon and small-molecule drugs <xref rid="B5" ref-type="bibr">5</xref>. The antibody-mediated humoral response is crucial for preventing viral infections. A subset of these antibodies, which reduce viral infectivity by binding to the surface epitopes of viral particles and thereby blocking the entry of the virus to an infected cell, are defined as neutralizing antibodies (NAbs) <xref rid="B6" ref-type="bibr">6</xref>. NAbs elicit their protective activities in three main steps. NAbs may prevent the attachment of the virion to its receptors on targeted cells, causing aggregation of virus particles. Further, the viruses are lysed through the constant (C) region of the antibody-mediated opsonization or complement activation <xref rid="B7" ref-type="bibr">7</xref>. This review focuses on understanding immunopathogenesis of SARS-CoV-2 and addressing the benefits, challenges and considerations of neutralizing antibodies (NAbs).</p></sec><sec><title>Similarity of SARS-CoV-2 and SARS-CoV in antigen and receptor recognition by host</title><p>As shown in <bold>Figure <xref ref-type="fig" rid="F1">1</xref></bold>, major structural proteins of SARS-CoV-2 include the spike (S), membrane (M) and envelop (E) and nucleic capsid (N) proteins <xref rid="B8" ref-type="bibr">8</xref>. A coronavirus initiates cell fusion via attachment of the S protein with the receptor on the host cell surface. The viral nucleocapsid is delivered inside for subsequent replication. The S protein comprises two units, S1 and S2. The receptor-binding domain (RBD) within S1 directly interacts with host receptors <xref rid="B9" ref-type="bibr">9</xref>. Structural and functional analysis of the SARS-CoV-2 shows that the SARS-CoV-2 S protein binds the Angiotensin-converting enzyme 2 (ACE2) receptor on human alveolar epithelial cells <xref rid="B10" ref-type="bibr">10</xref>-<xref rid="B12" ref-type="bibr">12</xref>, suggesting SARS-CoV-2 uses the same receptor, ACE2, as SARS-CoV. However, the SARS-CoV-2 S protein binds ACE2 with higher affinity than SARS-CoV S <xref rid="B13" ref-type="bibr">13</xref>. The high affinity of the S protein for human ACE2 may lead to the great human-to-human transmission of SARS-CoV-2. Due to the key role of the S protein, it is the main target for antibody-mediated neutralization.</p></sec><sec><title>Innate and adaptive responses of human to SARS-CoV-2 and SARS-CoV</title><p>The clinical spectrum of the outcome of COVID-19 is highly variable, from mild flu-like symptoms to severe pneumonia. It is critical to take insights into cellular and humoral responses in SARS-CoV-2-induced COVID-19 <xref rid="B14" ref-type="bibr">14</xref>. Elucidation of SARS-CoV-2 immunopathogenesis is useful for developing passive antibody therapy, designing vaccines, and understanding of clinical drug interventions. However, the systemic landscape of the immune responses in patients with COVID-19 is unclear. Because the clinical features and immunopathogenesis of SARS-CoV-2 pose similarities with SARS-CoV <xref rid="B15" ref-type="bibr">15</xref>, knowledge learned from SARS-CoV has important implications for understanding this new coronavirus.</p><p>Resistance to SARS-CoV infections is associated with both innate and adaptive immune responses <xref rid="B16" ref-type="bibr">16</xref>. The innate immune response to SARS-CoV has not been completely defined <xref rid="B17" ref-type="bibr">17</xref>. Some studies demonstrated that both macrophage and dendritic cell (DC) play the important roles for viral destruction and immune response induction in mucosal-associated lymphoid tissues <xref rid="B18" ref-type="bibr">18</xref>. Due to homeostasis, macrophage and DC as vehicles seemed to disseminate viruses through the efferent lymphatic system. Meanwhile, activation of DC and macrophage by SARS-CoV led to excessive pro-inflammatory cytokine responses <xref rid="B19" ref-type="bibr">19</xref>. A drastic elevation of inflammatory cytokines and chemokines was observed in the tissues and serum of SARS-CoV patients <xref rid="B20" ref-type="bibr">20</xref>. The levels of, IFN-γ, IL-1β IL-6, IL-12, IL-8, MCP-1 and IP-10 are generally enhanced in the early infection and subsequently reduced in the recovery stage. Uncontrolled systemic inflammation (known as cytokine storm) further resulted in illness severity. The similar symptom of cytokine storm was observed in SARS-CoV-2 infection. The inflammatory cytokines and chemokines (IL-1β, IFN-γ, IP-10, and MCP-1), which may lead to activated T-helper-1 (Th1) cell responses, were upregulated <xref rid="B21" ref-type="bibr">21</xref>,<xref rid="B22" ref-type="bibr">22</xref>. However, SARS-CoV-2 patients secreted excessive IL-4 and IL-10 that may suppress inflammation via T-helper-2 (Th2) <xref rid="B14" ref-type="bibr">14</xref>. It differs from SARS-CoV infection. Further studies are necessary to elucidate innate responses in pathogenesis of SARS-CoV-2.</p><p>The adaptive immune response mainly consists of cellular (T cell) and humoral (B cell) responses. T cell-mediated responses in SARS-CoV infection have been well elucidated <xref rid="B23" ref-type="bibr">23</xref>. Both CD4+ and CD8+ T-cells provided broad and long-term protection. CD4+ T cells promoted the proliferation of neutralizing antibodies, whereas CD8+ T cells were responsible for the destruction of viral infected cells. Although all SARS‐CoV surface proteins, including S, M, E, and N proteins were involved in T cell responses, S protein contributed to the most T-cell recognition epitopes. Overall frequency of CD8+T cell response predominates over CD4+T cell response. Lymphopenia occurred in both SARS-CoV and SARS-CoV-2 infections <xref rid="B14" ref-type="bibr">14</xref>,<xref rid="B24" ref-type="bibr">24</xref>,<xref rid="B25" ref-type="bibr">25</xref>. The reduction of CD4+ and CD8+ T cells is commonly associated with lymphopenia. It will be interesting to elucidate T-cell mediated response in SARS-CoV-2 infection that may provide important hints for the design of the vaccine composed of viral structural proteins. On the other hand, patients with SARS-CoV infection had the strong humoral immune response to SARS-CoV <xref rid="B26" ref-type="bibr">26</xref>,<xref rid="B27" ref-type="bibr">27</xref>. Serum IgG, IgM, and IgA responses to SARS-CoV appeared in patients after primary SARS infection <xref rid="B28" ref-type="bibr">28</xref>. Neutralizing IgGs played a major role in the neutralization of the SARS-CoV. IgGs reached the peak in serum during the convalescent phase and diminished after recovery <xref rid="B29" ref-type="bibr">29</xref>. Memory B cells still provided the long-term protection in associated with cellular immune responses <xref rid="B30" ref-type="bibr">30</xref>. Despite markedly reducing virus replication, anti-S protein neutralizing IgGs could be associated with fatal acute lung injury through promoting IL-8/MCP-1 production and inflammatory macrophage accumulation <xref rid="B31" ref-type="bibr">31</xref>. These studies may provide important implications for observing IgG response in patients with SARS-CoV-2.</p></sec><sec><title>Advances in the development of neutralizing antibodies to SARS-CoV</title><p>NAbs provide important specific immune defense against viral infections in patients <xref rid="B32" ref-type="bibr">32</xref>, <xref rid="B33" ref-type="bibr">33</xref>,<xref rid="B34" ref-type="bibr">34</xref>. Numbers of antiviral NAbs have been developed in recent years, and some are now in clinical development. The role and importance of NAbs in protection from SARS-CoV infection has been thoroughly reviewed elsewhere <xref rid="B7" ref-type="bibr">7</xref>,<xref rid="B35" ref-type="bibr">35</xref>-<xref rid="B38" ref-type="bibr">38</xref>. Entry of SARS-CoV into the host cell is mediated by the attachment of S protein and ACE-2 receptor. The S protein is the major inducer of NAbs. Particularly, RBD within S1 unit is the most critical target for SARS-CoV NAbs <xref rid="B39" ref-type="bibr">39</xref>. Such NAbs can interrupt the interaction of RBD and its receptor ACE2. Most of NAbs have been identified to recognize RBD region <xref rid="B40" ref-type="bibr">40</xref>-<xref rid="B46" ref-type="bibr">46</xref>. Interestingly, some NAbs still showed to recognize epitopes on S2 unit <xref rid="B47" ref-type="bibr">47</xref>, suggesting that other mechanisms could be involved in the neutralization. At last virus clearance was mediated by antibody-dependent opsonization or complement activation <xref rid="B7" ref-type="bibr">7</xref>. These NAbs against SARS-CoV are summarized in <bold>Table <xref rid="T1" ref-type="table">1</xref></bold>.</p><p>Phage display has been used to identify neutralizing human monoclonal antibodies against SARS-CoV from both naïve and immune antibody libraries. The selected antibodies, 80R <xref rid="B40" ref-type="bibr">40</xref>, CR3014 <xref rid="B41" ref-type="bibr">41</xref>, CR3022 <xref rid="B42" ref-type="bibr">42</xref>, m396 <xref rid="B43" ref-type="bibr">43</xref>, blocked the binding of S1 domain and ACE2. 80R, CR3013 and m396 showed virus neutralization and prophylaxis capability in either vitro or animal models. Although CR3022 did not showed much neutralization alone, the mixture of CR3022 and CR3014 showed neutralization of SARS-CoV in a synergistic effect due to recognition of different epitopes on RBD <xref rid="B42" ref-type="bibr">42</xref>. A method for Epstein-Barr virus (EBV) transformation of human B cells was used to isolate NAbs. Six groups of NAbs, which were divided based on differential neutralization of SARS-CoV variants, have been successfully identified from memory B cells from SARS-CoV infected patients <xref rid="B30" ref-type="bibr">30</xref>. Furthermore, transgenic mice with human immunoglobulin genes have been used to produce NAbs against SARS-CoV by antigen immunization. Two NAbs, 201 and 68, were identified from transgenic mice <xref rid="B44" ref-type="bibr">44</xref>,<xref rid="B45" ref-type="bibr">45</xref>. They were effective for virus prophylaxis in animal models. On the other hand, several NAbs, B1 <xref rid="B46" ref-type="bibr">46</xref>, 1F8 and 5E9 <xref rid="B47" ref-type="bibr">47</xref>, against epitopes on SARS-CoV S2 still showed effectiveness in neutralization.</p></sec><sec><title>Perspectives on the development of neutralizing antibodies against SARS-CoV-2</title><p>The simplest and most direct approach to combating SARS-CoV-2 during the outbreak would be to use plasma from the convalescent patients <xref rid="B48" ref-type="bibr">48</xref>. Polyclonal NAbs could be induced in some convalescent patients and will be effective in treating SARS-CoV-2 <xref rid="B12" ref-type="bibr">12</xref>. These NAbs can provide passive immune responses to viral infection. Indeed, both SARS and Ebola patients received the treatment of convalescent plasma <xref rid="B49" ref-type="bibr">49</xref>,<xref rid="B50" ref-type="bibr">50</xref>. However, the outcomes of passive plasma therapy are unpredictable due to variability of sera in different patients.</p><p>Development of NAbs against SARS-CoV-2 is a relatively rapid approach to obtain the standardized agents that control re-emergence of COVID-19 <xref rid="B51" ref-type="bibr">51</xref>. The SARS-CoV-2 S protein is likely important target for developing NAbs to block binding and fusion of SARS-CoV-2 (<bold>Figure <xref ref-type="fig" rid="F2">2</xref></bold>). SARS-CoV-2 seems to use the same cell entry receptor, ACE2, as the SARS-CoV because ACE2 shows binding to RBD of both SARS-CoV and SARS-CoV-2 <xref rid="B11" ref-type="bibr">11</xref>. However, a recent study demonstrates that SARS-CoV-2 S protein binds ACE2 with higher affinity than SARS-CoV (10- to 20-folder) <xref rid="B13" ref-type="bibr">13</xref>, suggesting its recognition to ACE2 could be different with SARS-CoV. Although SARS-CoV-2 shows the high homology with SARS-CoV, antibody cross-reactivity is limited between the two virus S proteins. Several published SARS-CoV NAbs do not have appreciable binding to SARS-CoV-2 S protein <xref rid="B13" ref-type="bibr">13</xref>,<xref rid="B52" ref-type="bibr">52</xref>. A recent study shows that a SARS-CoV antibody, CR3022, binds to SARS-CoV-2 RBD <xref rid="B52" ref-type="bibr">52</xref>, but its neutralization capability is uncertain. Cocktail of NAbs has showed the stronger neutralization than alone in treatment of both Ebola and SARS viruses <xref rid="B47" ref-type="bibr">47</xref>,<xref rid="B53" ref-type="bibr">53</xref>. This finding suggests that a cocktail antibody approach for SARS-CoV-2 could be undertaken. Therefore, it will be very meaningful to generate NAbs targeting different epitopes on SARS-CoV-2. Combination of several potent NAbs could decrease the probability for escape virus isolates with decreased sensitivity to neutralization.</p><p>Computational simulation of antibody-antigen complexes has been used to guide the design of therapeutic antibodies <xref rid="B54" ref-type="bibr">54</xref>-<xref rid="B56" ref-type="bibr">56</xref>. Numbers of antibody structures (currently around 2,000 depositions) are available in the Protein Data Bank [PDB]. Based on these PDB data, the comparative model of an antibody onto the viral surface antigen can be predicted. The key residues between RBD and NAbs can be identified to provide important implications for the vaccines against SARS-CoV-2. The key residues of interface between an antibody and the antigen can be optimized to produce high affinity <xref rid="B57" ref-type="bibr">57</xref>. Several recent computer docking models have been used to predict the interaction between S protein and human ACE2 <xref rid="B10" ref-type="bibr">10</xref> or antibodies <xref rid="B52" ref-type="bibr">52</xref>. The studies revealed the important discovery that SARS-CoV-specific CR3022 antibody could cross-react to SARS-CoV-2.</p></sec><sec sec-type="conclusions"><title>Conclusion</title><p>The availability of therapeutic NAbs against SARS-CoV-2 will offer benefits for the control of the current pandemic and the possible re-emergence of the virus in the future, and their development therefore remains a high priority. The efforts of NAb development will surely be an area of intense research in the coming months and even years. Currently, several strategies are used in the clinic or under development, such as viral-targeting therapeutics and host-targeting agents (such as interferons, glucocorticoids) for the treatment of COVID-19. As compared with these therapeutic strategies, NAbs appear to be more specific for virions. Understanding of action mechanisms of NAbs may provide valuable implications for the rapid development of antibody therapy and vaccine for SARS-CoV-2. However, the development of NAb-based therapeutics is a time-consuming and laborious process. To date, no NAb agents for either SARS-CoV or (Middle East Respiratory Syndrome Coronavirus) MERS-CoV are available in the market. Meanwhile, a note of caution is that the effect of antibody immune response in protecting against pulmonary pathogenesis of SARS-CoV is controversial <xref rid="B31" ref-type="bibr">31</xref>. Some patients who died of SARS showed the strong NAb responses and pulmonary proinflammatory accumulation, suggesting NAbs could be associated with fatal acute lung injury. Therefore, it is important to take insight into humoral and cellular responses of SARS-CoV-2 when antiviral immunotherapy is developed.</p></sec></body><back><ack><p>The authors would like to thank the support from the Science and Technology Development Fund of Macau (FDCT/131/2016/A3, FDCT/0015/2018/A1), the National Key R&D Program of China (2019YFA0904400), the Multi-Year Research Grant (MYRG2019-00069-FHS), Start-up Research Grand (SRG2016-00082-FHS), and the intramural research program of Faculty of Health Sciences, University of Macau.</p></ack><ref-list><ref id="B1"><label>1</label><element-citation publication-type="other"><name><surname>Zhu</surname><given-names>N</given-names></name><name><surname>Zhang</surname><given-names>D</given-names></name><name><surname>Wang</surname><given-names>W</given-names></name><name><surname>Li</surname><given-names>X</given-names></name><name><surname>Yang</surname><given-names>B</given-names></name><name><surname>Song</surname><given-names>J</given-names></name><etal></etal><article-title>A Novel Coronavirus from Patients with Pneumonia in China, 2019</article-title><source>N Engl J Med</source><year>2020</year><comment>38, 727-33</comment></element-citation></ref><ref id="B2"><label>2</label><element-citation publication-type="journal"><name><surname>Lu</surname><given-names>R</given-names></name><name><surname>Zhao</surname><given-names>X</given-names></name><name><surname>Li</surname><given-names>J</given-names></name><name><surname>Niu</surname><given-names>P</given-names></name><name><surname>Yang</surname><given-names>B</given-names></name><name><surname>Wu</surname><given-names>H</given-names></name><etal></etal><article-title>Genomic characterisation and epidemiology of 2019 novel coronavirus: implications for virus origins and receptor binding</article-title><source>Lancet</source><year>2020</year><volume>395</volume><fpage>565</fpage><lpage>74</lpage><pub-id pub-id-type="pmid">32007145</pub-id></element-citation></ref><ref id="B3"><label>3</label><element-citation publication-type="other"><name><surname>Jiang</surname><given-names>S</given-names></name><name><surname>Xia</surname><given-names>S</given-names></name><name><surname>Ying</surname><given-names>T</given-names></name><name><surname>Lu</surname><given-names>L</given-names></name><article-title>A novel coronavirus (2019-nCoV) causing pneumonia-associated respiratory syndrome</article-title><source>Cell Mol Immunol</source><year>2020</year><comment>doi: 10.1038/s41423-020-0372-4. 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The viral surface proteins (spike, envelope and membrane glycoproteins) are embedded in a lipid bilayer envelope. <bold>(B)</bold> Comparison of the spike (S) proteins of SARS-CoV and SARS-CoV-2. RBD, receptor-binding domain; RBM, receptor-binding motif; HR1/2, heptad repeat 1/2.</p></caption><graphic xlink:href="ijbsv16p1718g001"></graphic></fig><fig id="F2" position="float"><label>Figure 2</label><caption><p>Schematic mechanism of the neutralizing antibodies. Competition of the neutralizing antibody with the receptor (ACE2) for binding to the receptor-binding domain (RBD) of the SARS-CoV-2 Spike protein is shown. The protruding portion (violet) of RBD is both the ACE2 receptor-binding site and the antibody epitope.</p></caption><graphic xlink:href="ijbsv16p1718g002"></graphic></fig><table-wrap id="T1" position="float"><label>Table 1</label><caption><p>Neutralizing antibodies against SARS-CoV</p></caption><table frame="hsides" rules="groups"><thead valign="top"><tr><th rowspan="1" colspan="1">Neutralizing antibody</th><th rowspan="1" colspan="1">Identification Method</th><th rowspan="1" colspan="1">Target Region</th><th rowspan="1" colspan="1">Animal model</th><th rowspan="1" colspan="1">Reference</th></tr></thead><tbody valign="top"><tr><td rowspan="1" colspan="1">80R</td><td rowspan="1" colspan="1">Phage display</td><td rowspan="1" colspan="1">S1 domain 426-492</td><td rowspan="1" colspan="1">Mouse</td><td rowspan="1" colspan="1"><xref rid="B40" ref-type="bibr">40</xref></td></tr><tr><td rowspan="1" colspan="1">CR3014</td><td rowspan="1" colspan="1">Phage display</td><td rowspan="1" colspan="1">S1 domain 318-510</td><td rowspan="1" colspan="1">Ferret</td><td rowspan="1" colspan="1"><xref rid="B41" ref-type="bibr">41</xref></td></tr><tr><td rowspan="1" colspan="1">CR3022</td><td rowspan="1" colspan="1">Phage display</td><td rowspan="1" colspan="1">S1 domain 318-510</td><td rowspan="1" colspan="1">NA</td><td rowspan="1" colspan="1"><xref rid="B42" ref-type="bibr">42</xref></td></tr><tr><td rowspan="1" colspan="1">m396</td><td rowspan="1" colspan="1">Phage display</td><td rowspan="1" colspan="1">S protein</td><td rowspan="1" colspan="1">Mouse</td><td rowspan="1" colspan="1"><xref rid="B43" ref-type="bibr">43</xref></td></tr><tr><td rowspan="1" colspan="1">B1</td><td rowspan="1" colspan="1">Phage display</td><td rowspan="1" colspan="1">S2 domain 1023-1189</td><td rowspan="1" colspan="1">NA</td><td rowspan="1" colspan="1"><xref rid="B46" ref-type="bibr">46</xref></td></tr><tr><td rowspan="1" colspan="1">Group I (S132, S228.11)</td><td rowspan="1" colspan="1">EBV transformed B cells</td><td rowspan="1" colspan="1">N-terminal RBD</td><td rowspan="1" colspan="1">NA</td><td rowspan="1" colspan="1"><xref rid="B30" ref-type="bibr">30</xref></td></tr><tr><td rowspan="1" colspan="1">Group II (S111.7, S224.17)</td><td rowspan="1" colspan="1">EBV transformed B cells</td><td rowspan="1" colspan="1">S1 domain 318-510</td><td rowspan="1" colspan="1">NA</td><td rowspan="1" colspan="1"><xref rid="B30" ref-type="bibr">30</xref></td></tr><tr><td rowspan="1" colspan="1">Group III (S3.1, S127.6, S217.4, S222.1, S237.1)</td><td rowspan="1" colspan="1">EBV transformed B cells</td><td rowspan="1" colspan="1">S1 domain 318-510</td><td rowspan="1" colspan="1">Mouse (S.1)</td><td rowspan="1" colspan="1"><xref rid="B30" ref-type="bibr">30</xref></td></tr><tr><td rowspan="1" colspan="1">Group IV (S110.4, S218.9, S223.4, S225.12, S226.10, S231.19, S232.17, S234.6)</td><td rowspan="1" colspan="1">EBV transformed B cells</td><td rowspan="1" colspan="1">S1 domain 318-510</td><td rowspan="1" colspan="1">NA</td><td rowspan="1" colspan="1"><xref rid="B30" ref-type="bibr">30</xref></td></tr><tr><td rowspan="1" colspan="1">Group V (S124.5, S219.2)</td><td rowspan="1" colspan="1">EBV transformed B cells</td><td rowspan="1" colspan="1">ND</td><td rowspan="1" colspan="1">NA</td><td rowspan="1" colspan="1"><xref rid="B30" ref-type="bibr">30</xref></td></tr><tr><td rowspan="1" colspan="1">Group VI (S109.8, S215.17, S227.14, S230.15)</td><td rowspan="1" colspan="1">EBV transformed B cells</td><td rowspan="1" colspan="1">S1 domain 318-510</td><td rowspan="1" colspan="1">Mouse</td><td rowspan="1" colspan="1"><xref rid="B30" ref-type="bibr">30</xref></td></tr><tr><td rowspan="1" colspan="1">201</td><td rowspan="1" colspan="1">HuMAb-Mouse<sup>®</sup></td><td rowspan="1" colspan="1">S1 domain 490-510</td><td rowspan="1" colspan="1">Mouse</td><td rowspan="1" colspan="1"><xref rid="B44" ref-type="bibr">44</xref>, <xref rid="B45" ref-type="bibr">45</xref></td></tr><tr><td rowspan="1" colspan="1">68</td><td rowspan="1" colspan="1">HuMAb-Mouse<sup>®</sup></td><td rowspan="1" colspan="1">S1 domain 130-150</td><td rowspan="1" colspan="1">Mouse</td><td rowspan="1" colspan="1"><xref rid="B44" ref-type="bibr">44</xref>, <xref rid="B45" ref-type="bibr">45</xref></td></tr><tr><td rowspan="1" colspan="1">1F8</td><td rowspan="1" colspan="1">XenoMouse®</td><td rowspan="1" colspan="1">S2 domain HR1</td><td rowspan="1" colspan="1">NA</td><td rowspan="1" colspan="1"><xref rid="B47" ref-type="bibr">47</xref></td></tr><tr><td rowspan="1" colspan="1">5E9</td><td rowspan="1" colspan="1">XenoMouse®</td><td rowspan="1" colspan="1">S2 domain HR2</td><td rowspan="1" colspan="1">NA</td><td rowspan="1" colspan="1"><xref rid="B47" ref-type="bibr">47</xref></td></tr></tbody></table></table-wrap></floats-group></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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