Interferon alfacon 1 inhibits SARS-CoV infection in human bronchial epithelial Calu-3 cells
Identifieur interne : 000526 ( Pmc/Corpus ); précédent : 000525; suivant : 000527Interferon alfacon 1 inhibits SARS-CoV infection in human bronchial epithelial Calu-3 cells
Auteurs : Yohichi Kumaki ; Craig W. Day ; Miles K. Wandersee ; Bradley P. Schow ; Justin S. Madsen ; Dixon Grant ; Jason P. Roth ; Donald F. Smee ; Lawrence M. Blatt ; Dale L. BarnardSource :
- Biochemical and Biophysical Research Communications [ 0006-291X ] ; 2008.
Abstract
The primary targets for SARS-CoV infection are the epithelial cells in the respiratory and intestinal tract. The angiotensin-converting enzyme 2 (ACE-2) has been identified as a functional receptor for SARS-CoV. ACE-2 has been shown to be expressed at the apical domain of polarized Calu-3 cells. In this report, interferon alfacon 1 was examined for inhibitory activities against SARS-CoV on human lung carcinoma epithelial Calu-3 cell line and the other three African green monkey kidney epithelial cell lines. Interferon alfacon 1 demonstrated significant antiviral activity in neutral red uptake assay and virus yield reduction assay. The data might provide an important insight into the mechanism of pathogenesis of SARS-CoV allowing further development of antiviral therapies for treating SARS infections.
Url:
DOI: 10.1016/j.bbrc.2008.04.006
PubMed: 18406349
PubMed Central: 2441846
Links to Exploration step
PMC:2441846Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Interferon alfacon 1 inhibits SARS-CoV infection in human bronchial epithelial Calu-3 cells</title><author><name sortKey="Kumaki, Yohichi" sort="Kumaki, Yohichi" uniqKey="Kumaki Y" first="Yohichi" last="Kumaki">Yohichi Kumaki</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Day, Craig W" sort="Day, Craig W" uniqKey="Day C" first="Craig W." last="Day">Craig W. Day</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Wandersee, Miles K" sort="Wandersee, Miles K" uniqKey="Wandersee M" first="Miles K." last="Wandersee">Miles K. Wandersee</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Schow, Bradley P" sort="Schow, Bradley P" uniqKey="Schow B" first="Bradley P." last="Schow">Bradley P. Schow</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Madsen, Justin S" sort="Madsen, Justin S" uniqKey="Madsen J" first="Justin S." last="Madsen">Justin S. Madsen</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Grant, Dixon" sort="Grant, Dixon" uniqKey="Grant D" first="Dixon" last="Grant">Dixon Grant</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Roth, Jason P" sort="Roth, Jason P" uniqKey="Roth J" first="Jason P." last="Roth">Jason P. Roth</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Smee, Donald F" sort="Smee, Donald F" uniqKey="Smee D" first="Donald F." last="Smee">Donald F. Smee</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Blatt, Lawrence M" sort="Blatt, Lawrence M" uniqKey="Blatt L" first="Lawrence M." last="Blatt">Lawrence M. Blatt</name><affiliation><nlm:aff id="aff2">Research Laboratories, InterMune Inc., Brisbane, San Diego, CA 94005, USA</nlm:aff></affiliation></author><author><name sortKey="Barnard, Dale L" sort="Barnard, Dale L" uniqKey="Barnard D" first="Dale L." last="Barnard">Dale L. Barnard</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">18406349</idno><idno type="pmc">2441846</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2441846</idno><idno type="RBID">PMC:2441846</idno><idno type="doi">10.1016/j.bbrc.2008.04.006</idno><date when="2008">2008</date><idno type="wicri:Area/Pmc/Corpus">000526</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000526</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Interferon alfacon 1 inhibits SARS-CoV infection in human bronchial epithelial Calu-3 cells</title><author><name sortKey="Kumaki, Yohichi" sort="Kumaki, Yohichi" uniqKey="Kumaki Y" first="Yohichi" last="Kumaki">Yohichi Kumaki</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Day, Craig W" sort="Day, Craig W" uniqKey="Day C" first="Craig W." last="Day">Craig W. Day</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Wandersee, Miles K" sort="Wandersee, Miles K" uniqKey="Wandersee M" first="Miles K." last="Wandersee">Miles K. Wandersee</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Schow, Bradley P" sort="Schow, Bradley P" uniqKey="Schow B" first="Bradley P." last="Schow">Bradley P. Schow</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Madsen, Justin S" sort="Madsen, Justin S" uniqKey="Madsen J" first="Justin S." last="Madsen">Justin S. Madsen</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Grant, Dixon" sort="Grant, Dixon" uniqKey="Grant D" first="Dixon" last="Grant">Dixon Grant</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Roth, Jason P" sort="Roth, Jason P" uniqKey="Roth J" first="Jason P." last="Roth">Jason P. Roth</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Smee, Donald F" sort="Smee, Donald F" uniqKey="Smee D" first="Donald F." last="Smee">Donald F. Smee</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author><author><name sortKey="Blatt, Lawrence M" sort="Blatt, Lawrence M" uniqKey="Blatt L" first="Lawrence M." last="Blatt">Lawrence M. Blatt</name><affiliation><nlm:aff id="aff2">Research Laboratories, InterMune Inc., Brisbane, San Diego, CA 94005, USA</nlm:aff></affiliation></author><author><name sortKey="Barnard, Dale L" sort="Barnard, Dale L" uniqKey="Barnard D" first="Dale L." last="Barnard">Dale L. Barnard</name><affiliation><nlm:aff id="aff1">Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</nlm:aff></affiliation></author></analytic><series><title level="j">Biochemical and Biophysical Research Communications</title><idno type="ISSN">0006-291X</idno><idno type="eISSN">1090-2104</idno><imprint><date when="2008">2008</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>The primary targets for SARS-CoV infection are the epithelial cells in the respiratory and intestinal tract. The angiotensin-converting enzyme 2 (ACE-2) has been identified as a functional receptor for SARS-CoV. ACE-2 has been shown to be expressed at the apical domain of polarized Calu-3 cells. In this report, interferon alfacon 1 was examined for inhibitory activities against SARS-CoV on human lung carcinoma epithelial Calu-3 cell line and the other three African green monkey kidney epithelial cell lines. Interferon alfacon 1 demonstrated significant antiviral activity in neutral red uptake assay and virus yield reduction assay. The data might provide an important insight into the mechanism of pathogenesis of SARS-CoV allowing further development of antiviral therapies for treating SARS infections.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Ksiazek, T G" uniqKey="Ksiazek T">T.G. Ksiazek</name></author><author><name sortKey="Erdman, D" uniqKey="Erdman D">D. Erdman</name></author><author><name sortKey="Goldsmith, C S" uniqKey="Goldsmith C">C.S. Goldsmith</name></author><author><name sortKey="Zaki, S R" uniqKey="Zaki S">S.R. Zaki</name></author><author><name sortKey="Peret, T" uniqKey="Peret T">T. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Biochem Biophys Res Commun</journal-id><journal-id journal-id-type="iso-abbrev">Biochem. Biophys. Res. Commun</journal-id><journal-title-group><journal-title>Biochemical and Biophysical Research Communications</journal-title></journal-title-group><issn pub-type="ppub">0006-291X</issn><issn pub-type="epub">1090-2104</issn><publisher><publisher-name>Elsevier</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">18406349</article-id><article-id pub-id-type="pmc">2441846</article-id><article-id pub-id-type="publisher-id">S0006-291X(08)00661-X</article-id><article-id pub-id-type="doi">10.1016/j.bbrc.2008.04.006</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Interferon alfacon 1 inhibits SARS-CoV infection in human bronchial epithelial Calu-3 cells</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Kumaki</surname><given-names>Yohichi</given-names></name><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Day</surname><given-names>Craig W.</given-names></name><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Wandersee</surname><given-names>Miles K.</given-names></name><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Schow</surname><given-names>Bradley P.</given-names></name><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Madsen</surname><given-names>Justin S.</given-names></name><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Grant</surname><given-names>Dixon</given-names></name><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Roth</surname><given-names>Jason P.</given-names></name><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Smee</surname><given-names>Donald F.</given-names></name><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Blatt</surname><given-names>Lawrence M.</given-names></name><xref rid="aff2" ref-type="aff">b</xref></contrib><contrib contrib-type="author"><name><surname>Barnard</surname><given-names>Dale L.</given-names></name><email>dale.barnard@usu.edu</email><xref rid="aff1" ref-type="aff">a</xref><xref rid="cor1" ref-type="corresp">⁎</xref></contrib></contrib-group><aff id="aff1"><label>a</label>Institute for Antiviral Research, Department of Animal, Dairy and Veterinary Science, Utah State University, 5600 Old Main Hill, Logan, UT 84322-5600, USA</aff><aff id="aff2"><label>b</label>Research Laboratories, InterMune Inc., Brisbane, San Diego, CA 94005, USA</aff><author-notes><corresp id="cor1"><label>⁎</label>Corresponding author. Fax: +1 435 797 3959. <email>dale.barnard@usu.edu</email></corresp></author-notes><pub-date pub-type="pmc-release"><day>10</day><month>4</month><year>2008</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on .</pmc-comment>
<pub-date pub-type="ppub"><day>20</day><month>6</month><year>2008</year></pub-date><pub-date pub-type="epub"><day>10</day><month>4</month><year>2008</year></pub-date><volume>371</volume><issue>1</issue><fpage>110</fpage><lpage>113</lpage><history><date date-type="received"><day>28</day><month>3</month><year>2008</year></date></history><permissions><copyright-statement>Copyright © 2008 Elsevier Inc. Published by Elsevier Inc. All rights reserved.</copyright-statement><copyright-year>2008</copyright-year><copyright-holder>Elsevier Inc.</copyright-holder><license><license-p>Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.</license-p></license></permissions><abstract><p>The primary targets for SARS-CoV infection are the epithelial cells in the respiratory and intestinal tract. The angiotensin-converting enzyme 2 (ACE-2) has been identified as a functional receptor for SARS-CoV. ACE-2 has been shown to be expressed at the apical domain of polarized Calu-3 cells. In this report, interferon alfacon 1 was examined for inhibitory activities against SARS-CoV on human lung carcinoma epithelial Calu-3 cell line and the other three African green monkey kidney epithelial cell lines. Interferon alfacon 1 demonstrated significant antiviral activity in neutral red uptake assay and virus yield reduction assay. The data might provide an important insight into the mechanism of pathogenesis of SARS-CoV allowing further development of antiviral therapies for treating SARS infections.</p></abstract><kwd-group><title>Keywords</title><kwd>Angiotensin-converting enzyme 2</kwd><kwd>ACE-2</kwd><kwd>Calu-3 cells</kwd><kwd>IFN-alfacon 1</kwd><kwd>Neutral red uptake assay</kwd><kwd>SARS-CoV</kwd><kwd>Severe acute respiratory syndrome</kwd><kwd>Virus yield reduction assay</kwd></kwd-group></article-meta></front><body><p id="para.0010">Severe acute respiratory syndrome (SARS) is the first new infectious disease of this century caused by a novel human corona virus (SARS-CoV) that leads to pulmonary pathological features <xref rid="bib1" ref-type="bibr">[1]</xref>, <xref rid="bib2" ref-type="bibr">[2]</xref>. SARS, which originated from Southern China at the end of 2002, has a high mortality and morbidity. Since then the disease had spread to more than 30 countries. By July 31, 2003, more than 8000 SARS cases and nearly 800 SARS-related deaths were reported around the world. Studies on the molecular evolution of SARS-CoV suggested that the virus emerged from non-human sources <xref rid="bib3" ref-type="bibr">[3]</xref>. The disease poses a new threat for respiratory medicine and represents a challenge for antiviral drug development and administration <xref rid="bib4" ref-type="bibr">[4]</xref>, <xref rid="bib5" ref-type="bibr">[5]</xref>.</p><p id="para.0015">The combination of ribavirin and corticosteroids was the most frequently administered antiviral agent for SARS-CoV <xref rid="bib6" ref-type="bibr">[6]</xref>, <xref rid="bib7" ref-type="bibr">[7]</xref>, <xref rid="bib8" ref-type="bibr">[8]</xref>, <xref rid="bib9" ref-type="bibr">[9]</xref>, <xref rid="bib10" ref-type="bibr">[10]</xref>. However, ribavirin at nontoxic concentrations has little <italic>in vitro</italic> activity against SARS-CoV <xref rid="bib11" ref-type="bibr">[11]</xref> and has many side effects <xref rid="bib8" ref-type="bibr">[8]</xref>. An improved clinical outcome was reported among SARS patients receiving early administration with Kaletra plus ribavirin and corticosteroids <xref rid="bib12" ref-type="bibr">[12]</xref>. We recently reported that ribavirin could enhance the SARS-CoV infectivity in BALB/c mice and our data did not support the use of ribavirin for treating SARS patients <xref rid="bib13" ref-type="bibr">[13]</xref>. Antibodies to the SARS-CoV spike protein have been shown to block entry <xref rid="bib14" ref-type="bibr">[14]</xref>. Small peptides derived from the heptad repeat (HR) regions of SARS-CoV S protein have been shown to inhibit SARS-CoV infection by the interference of SARS-CoV fusion with target cells <xref rid="bib15" ref-type="bibr">[15]</xref>, <xref rid="bib16" ref-type="bibr">[16]</xref>. SARS main protease, which is essential for the replication cycle of SARS-CoV, has been a key target for developing anti-SARS drugs <xref rid="bib17" ref-type="bibr">[17]</xref>, <xref rid="bib18" ref-type="bibr">[18]</xref>. Antisense RNA and RNA interference (RNAi) technologies have shown potential prospect in treating some severe diseases <xref rid="bib19" ref-type="bibr">[19]</xref> and have been considered as important candidate medicines in the treatment of SARS infection. However, no clear evidence was demonstrated to support these clinical observations. Therefore, development of new anti-SARS-CoV agents is urgently needed for the treatment of SARS patients.</p><p id="para.0020">Interferons are small, natural or synthetic protein and glycoprotein cytokines that are produced by leucocytes, T-lymphocytes, and fibroblasts in response to infection and other biological stimuli. Interferon can activate tumor-specific cytotoxic T-lymphocytes, which play an important role in destroying foreign cells in the body. Interferons attach to special receptors on the surface of cell membranes and induce transcription, which results in an antiviral state in the target cells. In 1957 researchers discovered that the immune system produced a substance in response to a viral infection that acted as an antiviral agent <xref rid="bib20" ref-type="bibr">[20]</xref>, <xref rid="bib21" ref-type="bibr">[21]</xref>. They called that substance “interferon”. Since then, recombinant DNA technology has provided a larger supply of interferons and has allowed extensive research regarding interferon’s therapeutic properties. In a recent study, we evaluated a few compounds approved for therapeutic use in humans and some <italic>in vitro</italic> inhibitors of SARS-CoV for inhibition in the mouse SARS-CoV replication model. A hybrid interferon, interferon-alpha (IFN-α) B/D, and a mismatched double-stranded (ds) RNA interferon inducer, Ampligen (poly I:poly C124), were shown to potently inhibit virus titers in the lungs of infected mice <xref rid="bib22" ref-type="bibr">[22]</xref>. In this report, we describe a cell-based assay using SARS-CoV infection of human lung epithelial cells (Calu-3) and three African green monkey kidney epithelial cell lines to evaluate a related compound, interferon alfacon 1 (IFN-alfacon 1, consensus interferon, Infergen™) against SARS-CoV.</p><sec id="section.0010"><title>Materials and methods</title><p id="para.0025">Three African green monkey kidney epithelial cell lines, Vero 76, Vero E6, and MA104 (embryonic), were obtained from American Type Culture Collection (ATCC, Manassas, VA) <xref rid="bib23" ref-type="bibr">[23]</xref>. Vero 76 and MA104 cells were routinely grown in minimal essential medium (MEM) supplemented with 10% heat-inactivated fetal bovine serum (FBS, Hyclone Laboratories, Logan, UT) and Vero E6 cells were maintained in MEM supplemented with 10% FBS, 1% MEM non-essential amino acids (Sigma–Aldrich Co., St. Louis, MO) and 1 mM of sodium pyruvate (Sigma–Aldrich). Calu-3 cells are a human lung epithelial cell line originating from a human pulmonary adenocarcinoma and, were grown in Dulbecco’s modified Eagle’s minimal essential medium (DMEM) supplemented with 20% FBS (D-20) <xref rid="bib24" ref-type="bibr">[24]</xref>. SARS-CoV, strain Urbani (200300592), was obtained from the Centers for Disease Control (CDC, Atlanta, GA). The strain was propagated and titrated in Vero 76 cells. For antiviral assays, the serum was reduced to 2% and gentamicin added to the medium at a final concentration of 50 μg/ml. Stock solutions of IFN-alfacon 1 (InterMune, Inc., Brisbane, CA) were made at a concentration of 27 μg/ml and stored at −20 °C. IFN-alfacon 1 was solubilized in MEM for <italic>in vitro</italic> experiments.</p><p id="para.0030">The neutral red (NR) uptake assay for determination of antiviral efficacy and compound cytotoxicity was used for <italic>in vitro</italic> evaluation <xref rid="bib13" ref-type="bibr">[13]</xref>. The cells were seeded to the 96-well tissue culture plate (Corning Incorporated Costa, NY) in 0.1 ml at 2 × 10<sup>5</sup> cells/ml 1 day before, and treated with IFN-alfacon 1 at different concentrations. Then, the cells were infected with SARS-CoV isolate at the multiplicity of infection (m.o.i) from 0.0007 to 0.003. Compound and virus were added in equal volumes (0.1 ml). The plates were incubated at 37 °C for 3 days until the cells in the virus control wells showed complete viral cytopathic effect (CPE) by light microscopy. Each concentration of compound was assayed for inhibition of viral CPE in triplicate and for cytotoxicity in duplicate. Six wells per plate were set aside as uninfected, untreated cell controls and six wells per plate received virus only and represented controls for virus replication.</p><p id="para.0035">At 3 days post virus exposure, the cells were scored for percent CPE or for cytotoxicity by microscopic observation. The values obtained were converted to percents of untreated, uninfected controls. The 50% cell cytotoxic doses (CC<sub>50</sub>) and 50% virus inhibitory doses (IC<sub>50</sub>), representing the putative concentration at which 50% of the monolayers would show compound cytotoxicity or virus cytopathic effect, respectively, were estimated by regression analysis. A selectivity index (SI) was calculated using the formula: SI = CC<sub>50</sub>/IC<sub>50</sub>. The activity in the CPE assay was then verified spectrophotometrically by NR uptake assay on the same plate. The NR assay was performed using a modified method of Cavanaugh et al. <xref rid="bib25" ref-type="bibr">[25]</xref> as described by Barnard et al. <xref rid="bib13" ref-type="bibr">[13]</xref>. Briefly, NR dye was added to each well of the plate, and the plate incubated for approximately 2 h at 37 °C in the dark. The NR solution was removed from the wells, rinsed and any remaining dye extracted using ethanol buffered with Sörenson’s citrate buffer. The plates were read at 405/540 nanometers (nm) wavelength with a microplate reader (Opsys MR™, Dynex Technologies, Chantilly, VA). Absorbance values were expressed as percents of untreated controls and IC<sub>50</sub>, CC<sub>50</sub>, and SI values were calculated as described above.</p><p id="para.0040">Virus yield reduction assay is more sensitive assay to confirm the results of the NR uptake assay. Infectious virus yield from the CPE inhibition assay were determined on the supernatant from the test well as previously described <xref rid="bib13" ref-type="bibr">[13]</xref>. Sample wells at each compound concentration tested were pooled and titered in Vero 76 cells for infectious virus by CPE assay as previously described by Barnard et al. <xref rid="bib26" ref-type="bibr">[26]</xref>. A 90% reduction in virus yield (IC<sub>90</sub>) was then calculated by linear regression analysis. This represented a one-log<sub>10</sub> inhibition in titer when compared to untreated virus controls.</p></sec><sec id="section.0015"><title>Results</title><p id="para.0045">We first examined the effect of IFN-alfacon 1 on the replication of SARS-CoV in Vero 76 cells at 37 °C. IFN-alfacon 1 inhibited virus replication in a dose–dependent manner. IFN-alfacon 1 had an IC<sub>50</sub> of 0.16 ng/ml and CC<sub>50</sub> of >100 ng/ml as determined by NR assay (<xref rid="tbl1" ref-type="table">Table 1</xref>). However, IFN-alfacon 1 did not always work in the Vero 76 cells. The activity against SARS-CoV in Vero 76 cells was sporadic and appeared to be highly variable depending upon the age and condition of the host cells. The monolayers of Vero 76 cells had to be rinsed gently to achieve valid NR assays. Then, IFN-alfacon 1 inhibition of virus replication was further tested in Vero E6 cells and MA104 cells. IFN-alfacon 1 provided a complete protection at the higher doses and a linear dose response at the lower part of the concentration curve. IC<sub>50</sub> was 4.6 ng/ml in Vero E6 cells and, 0.29 ng/ml in MA104 cells, respectively (<xref rid="tbl1" ref-type="table">Table 1</xref>). IFN-alfacon 1 also inhibited SARS-CoV isolate with SI values ranging from >22 to >625 (<xref rid="tbl1" ref-type="table">Table 1</xref>). The cytopathic effect in infected Calu-3 cells was not observed within 3 days of infection.<table-wrap position="float" id="tbl1"><label>Table 1</label><caption><p>Effect of interferon alfacon 1 on SARS-CoV replication in different cell lines <italic>in vitro</italic></p></caption><table frame="hsides" rules="groups"><thead><tr><th rowspan="2">Cell lines<xref rid="tblfn1" ref-type="table-fn">a</xref></th><th colspan="3">Neutral red (NR) uptake assay (ng/ml)<hr></hr></th></tr><tr><th>IC<sub>50</sub><xref rid="tblfn2" ref-type="table-fn">b</xref></th><th>CC<sub>50</sub><xref rid="tblfn3" ref-type="table-fn">c</xref></th><th>SI<xref rid="tblfn4" ref-type="table-fn">d</xref></th></tr></thead><tbody><tr><td>Vero76</td><td align="char">0.16 ± 0.09<xref rid="tblfn5" ref-type="table-fn">e</xref></td><td align="char">>100</td><td>>625</td></tr><tr><td>Vero E6</td><td align="char">4.6 ± 4.3</td><td align="char">>100</td><td>>22</td></tr><tr><td>MA104</td><td align="char">0.29 ± 0.3</td><td align="char">>100</td><td>>345</td></tr><tr><td>Calu-3</td><td>ND<xref rid="tblfn6" ref-type="table-fn">f</xref></td><td align="char">>100</td><td>ND</td></tr></tbody></table><table-wrap-foot><fn id="tblfn1"><label>a</label><p>Vero 76, Vero E6, and MA104 cells were seeded to the 96-well tissue culture plate in 0.1 ml at 2 × 10<sup>5</sup> cells/ml. Calu-3 cells were seeded in 0.1 ml at 4 × 10<sup>5</sup> cells/ml.</p></fn></table-wrap-foot><table-wrap-foot><fn id="tblfn2"><label>b</label><p>IC<sub>50</sub>: 50% inhibitory concentration.</p></fn></table-wrap-foot><table-wrap-foot><fn id="tblfn3"><label>c</label><p>CC<sub>50</sub>: 50% cytotoxic concentration.</p></fn></table-wrap-foot><table-wrap-foot><fn id="tblfn4"><label>d</label><p>SI: selectivity index.</p></fn></table-wrap-foot><table-wrap-foot><fn id="tblfn5"><label>e</label><p>Values are expressed as means ± standard deviation.</p></fn></table-wrap-foot><table-wrap-foot><fn id="tblfn6"><label>f</label><p>Could not be determined, due to lack of virus-induced CPE in this cell line.</p></fn></table-wrap-foot></table-wrap></p><p id="para.0050">The activity of IFN-alfacon 1 was further tested in a virus yield reduction assay. IFN-alfacon 1 reduced virus yields by 90% at 3.3 ng/ml in Vero 76 cells. IFN-alfacon 1 reduced virus yields by 90% at 3.02 ng/ml in Vero E6 cells. IFN-alfacon 1 had an IC<sub>90</sub> = 0.33 ng/ml in MA104 cells, which confirmed the activity demonstrated by NR assay (<xref rid="tbl2" ref-type="table">Table 2</xref>). SARS-CoV was found to productively infect human bronchial epithelial Calu-3 cells; SARS-CoV-induced CPE was initially observed in medium containing 20% FCS at day 8 and 2% FCS at day 4 <xref rid="bib24" ref-type="bibr">[24]</xref>. Based on these observations, IFN-alfacon 1 was evaluated to test the inhibitory effect on plating of SARS-CoV infection from the culture fluids of the infected Calu-3 cells. The supernatants were kept frozen at −80 °C until they were needed for assessing infectious viral titers by a standard TCID50 assay with permissive Vero 76 cells, as described above. The activity of IFN-alfacon 1 was confirmed by the virus yield reduction assay. IFN-alfacon 1 blocked viral production after incubation for 3 days in comparison to mock-treated cells and reduced virus yields by 90% at 0.046 ng/ml (<xref rid="tbl2" ref-type="table">Table 2</xref>). IFN-alfacon 1 inhibited SARS-CoV infection in Calu-3 with SI value of 2173 (<xref rid="tbl2" ref-type="table">Table 2</xref>). We also verified that SARS-CoV can infect human bronchial epithelial Calu-3 cells without causing significant cytopathic effects within 3 days of infection (<xref rid="tbl3" ref-type="table">Table 3</xref>).<table-wrap position="float" id="tbl2"><label>Table 2</label><caption><p>Effect of interferon alfacon 1 on SARS-CoV replication in different cell lines <italic>in vitro</italic></p></caption><table frame="hsides" rules="groups"><thead><tr><th>Cell lines</th><th>Virus yield reduction assay IC<sub>90</sub> (ng/ml)<xref rid="tblfn7" ref-type="table-fn">a</xref></th><th>SI<xref rid="tblfn8" ref-type="table-fn">b</xref></th></tr></thead><tbody><tr><td>Vero 76</td><td align="char">3.3 ± 4.5</td><td align="char">30</td></tr><tr><td>Vero E6</td><td align="char">3.02 ± 2.3<xref rid="tblfn9" ref-type="table-fn">c</xref></td><td align="char">33</td></tr><tr><td>MA104</td><td align="char">0.33 ± 0.36</td><td align="char">303</td></tr><tr><td>Calu-3</td><td align="char">0.046 ± 0.011</td><td align="char">2173</td></tr></tbody></table><table-wrap-foot><fn id="tblfn7"><label>a</label><p>IC<sub>90</sub>: 90% inhibitory concentration.</p></fn></table-wrap-foot><table-wrap-foot><fn id="tblfn8"><label>b</label><p>SI: selective index (CC<sub>50</sub>/IC<sub>90</sub>), based on CC<sub>50</sub> > 100 ng/ml.</p></fn></table-wrap-foot><table-wrap-foot><fn id="tblfn9"><label>c</label><p>Values are expressed as means ± standard deviation.</p></fn></table-wrap-foot></table-wrap><table-wrap position="float" id="tbl3"><label>Table 3</label><caption><p>Cytotoxicity of interferon alfacon 1 and virus yield after infection with Urbani isolate in different untreated cell lines <italic>in vitro</italic></p></caption><table frame="hsides" rules="groups"><thead><tr><th>Cell lines</th><th>Cytotoxicity<xref rid="tblfn10" ref-type="table-fn">a</xref> (%)</th><th>Virus yield<xref rid="tblfn11" ref-type="table-fn">b</xref></th></tr></thead><tbody><tr><td>Vero 76</td><td align="char">2.55 ± 3.6</td><td align="char">4.5 ± 0.39</td></tr><tr><td>Vero E6</td><td align="char">24.5 ± 21.5</td><td align="char">4.3 ± 0.08</td></tr><tr><td>MA104</td><td align="char">18.9 ± 21.3</td><td align="char">4.9 ± 0.36</td></tr><tr><td>Calu-3</td><td align="char">33.9 ± 8.9</td><td align="char">3.6 ± 0.76</td></tr></tbody></table><table-wrap-foot><fn id="tblfn10"><label>a</label><p>Cytotoxicity of IFN-alfacon 1 at 100 ng/ml.</p></fn></table-wrap-foot><table-wrap-foot><fn id="tblfn11"><label>b</label><p>Log<sub>10</sub> CCID<sub>50</sub> ± SD per 0.1 ml.</p></fn></table-wrap-foot></table-wrap></p></sec><sec id="section.0020"><title>Discussion</title><p id="para.0055">Interferons have been considered as the first line of defense against viral infections. Interferon type I is divided into interferon-alpha (leukocyte interferon) produced by virus-infected leukocytes and interferon-beta (fibroblast interferon) produced by virus-infected fibroblasts, or virus-infected epithelial cells. Type 1 interferons (alpha/beta) have been shown to be effective for treating patients with hepatitis type C (HCV) <xref rid="bib27" ref-type="bibr">[27]</xref>. Alpha interferons, which not only block the replication of several viruses but also activate the immune system, have also been shown to be efficacious in treating hairy cell leukemia, malignant melanoma, and Kaposi’s sarcoma (an AIDS-related cancer) and interferon-alpha was shown to effectively inhibit SARS-CoV replication <xref rid="bib28" ref-type="bibr">[28]</xref>. IFN-alfacon 1 is a non-naturally occurring, novel synthetic recombinant type 1 interferon-alpha developed by comparing the amino acid sequences of several natural interferon-alpha subtypes and assigning the most frequently observed amino acid in each corresponding position to generate a consensus molecule. IFN-alfacon 1 was also approved by the US Food and Drug Administration as the new class of anti-HCV inhibitors. IFN-alfacon 1 is the only IFN tested in human trials. The re-treatment with IFN-alfacon 1 is effective therapy for patients with chronic hepatitis C who have either not responded to previous interferon therapy or relapsed after discontinuation of interferon therapy <xref rid="bib29" ref-type="bibr">[29]</xref>. Paragas et al. reported that the IFN-alfacon 1 had the anti-SARS-CoV activity only before infection in cell-based model <italic>in vitro</italic><xref rid="bib30" ref-type="bibr">[30]</xref>. In this case, IFN-alfacon 1 most likely induces an antiviral state in the target cells, which produce a cellular environment that is not suitable for viral replication. However, IFN-alfacon 1 did not show activity when the cells were treated with IFN-alfacon 1 after infection with SARS-CoV, suggesting that IFN-alfacon 1 might not directly block viral replication in cells that are already infected <xref rid="bib30" ref-type="bibr">[30]</xref>. Loutfy et al. demonstrated that IFN-alfacon 1 was combined with corticosteroids, in a preliminary pilot study, to assess potential clinical benefit and safety for SARS patients. This data suggested that IFN-alfacon 1 might function as an antiviral therapeutic for the treatment of SARS patients <xref rid="bib31" ref-type="bibr">[31]</xref>.</p><p id="para.0060">Epithelial cells are a primary barrier to infection by microorganisms entering the host via body cavities. Epithelial cells are organized in a polarized fashion with two distinct membrane domains, the apical and basolateral domains <xref rid="bib32" ref-type="bibr">[32]</xref>. The primary targets for SARS-CoV infection are the epithelial cells in the respiratory and intestinal tract. It has been reported that the angiotensin-converting enzyme 2 (ACE-2) is the functional receptor for SARS-CoV <xref rid="bib33" ref-type="bibr">[33]</xref>. Mossel et al. demonstrated that Vero E6, MA104 and Calu-3 cells expressed human ACE-2 on the apical membrane domain. The infection was initiated successfully from the apical, but not from the basolateral side <xref rid="bib23" ref-type="bibr">[23]</xref>. Tseng et al. published the first SARS-CoV <italic>in vitro</italic> replication model using monolayers and polarized Calu-3 cells. The receptor for SARS-CoV is localized on and mediates infection through the apical plasma membrane of respiratory epithelial cells and SARS-CoV entry and release may be focused on the apical surface of these cells <xref rid="bib24" ref-type="bibr">[24]</xref>. Except Calu-3 cells, no human respiratory epithelial cell lines have been shown as yet to support SARS-CoV infection. In addition to searching for vaccines against SARS-CoV, it is important for advancing our knowledge to understand how SARS-CoV interact with the polarized lung epithelial cells and, to look for other approaches to block viral replication as a means of chemotherapeutic control.</p><p id="para.0065">We developed this simple assay system to screen one compound in Calu-3 cells, which had been infected with SARS-CoV isolate, by virus yield reduction assay. Calu-3 cells were treated with IFN-alfacon 1 and, inoculated with SARS-CoV isolate, the titers of infectious viral particles in the supernatants harvested after infection for 3 days. We verified that SARS-CoV can be propagated in Calu-3 cells in 3 days (<xref rid="tbl3" ref-type="table">Table 3</xref>). The human lung Calu-3 cell line provides a useful model for evaluating efficacy and mechanisms of anti-SARS compounds such as interferon. IFN-alfacon 1 was shown to be more active against SARS-CoV when tested in human lung epithelial Calu-3 cells than in African green monkey epithelial cells (<xref rid="tbl2" ref-type="table">Table 2</xref>). In our two assay systems, IFN-alfacon 1 demonstrated significant antiviral activity in neutral red uptake assay and virus yield reduction assay. 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Bailey, Charles Swann, and Meeyeon Ahn for kindly providing technical assistance, and Anna Marie H. Vaughan for excellent secretarial help. This work was supported by contracts NO1-A1-30048 and NO1-AI-15354 from the Virology Branch, National Institute of Allergic and Infectious Diseases, National Institutes of Health.</p></ack></back></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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