The tight junction-associated protein occludin is required for a postbinding step in hepatitis C virus entry and infection
The precise mechanisms regulating hepatitis C virus (HCV) entry into hepatic cells remain unknown. However, several cell surface proteins have been identified as entry factors for this virus. Of these molecules, claudin-1, a tight junction (TJ) component, is considered a coreceptor required for HCV entry. Recently, we have demonstrated that HCV envelope glycoproteins (HCVgp) promote structural and functional TJ alterations. Additionally, we have shown that the intracellular interaction between viral E2 glycoprotein and occludin, another TJ-associated protein, could be the cause of the mislocalization of TJ proteins. Herein we demonstrated, by using cell culture-derived HCV particles (HCVcc), that interference of occludin expression markedly reduced HCV infection. Furthermore, our results with HCV pseudotyped particles indicated that occludin, but not other TJ-associated proteins, such as junctional adhesion molecule A or zonula occludens protein 1, was required for HCV entry. Using HCVcc, we demonstrated that occludin did not play an essential role in the initial attachment of HCV to target cells. Surface protein labeling experiments showed that both expression levels and cell surface localization of HCV (co)receptors CD81, scavenger receptor class B type I, and claudin-1 were not affected upon occludin knockdown. In addition, immunofluorescence confocal analysis showed that occludin interference did not affect subcellular distribution of the HCV (co)receptors analyzed. However, HCVgp fusion-associated events were altered after occludin silencing. In summary, we propose that occludin plays an essential role in HCV infection and probably affects late entry events. This observation may provide new insights into HCV infection and related pathogenesis.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2009 |
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| Erschienen: |
2009 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:83 |
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| Enthalten in: |
Journal of virology - 83(2009), 16 vom: 13. Aug., Seite 8012-20 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Benedicto, Ignacio [VerfasserIn] |
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| Links: |
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| Themen: |
Journal Article |
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| Anmerkungen: |
Date Completed 08.09.2009 Date Revised 20.10.2021 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1128/JVI.00038-09 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM189187301 |
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| 100 | 1 | |a Benedicto, Ignacio |e verfasserin |4 aut | |
| 245 | 1 | 4 | |a The tight junction-associated protein occludin is required for a postbinding step in hepatitis C virus entry and infection |
| 264 | 1 | |c 2009 | |
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| 500 | |a Date Revised 20.10.2021 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a The precise mechanisms regulating hepatitis C virus (HCV) entry into hepatic cells remain unknown. However, several cell surface proteins have been identified as entry factors for this virus. Of these molecules, claudin-1, a tight junction (TJ) component, is considered a coreceptor required for HCV entry. Recently, we have demonstrated that HCV envelope glycoproteins (HCVgp) promote structural and functional TJ alterations. Additionally, we have shown that the intracellular interaction between viral E2 glycoprotein and occludin, another TJ-associated protein, could be the cause of the mislocalization of TJ proteins. Herein we demonstrated, by using cell culture-derived HCV particles (HCVcc), that interference of occludin expression markedly reduced HCV infection. Furthermore, our results with HCV pseudotyped particles indicated that occludin, but not other TJ-associated proteins, such as junctional adhesion molecule A or zonula occludens protein 1, was required for HCV entry. Using HCVcc, we demonstrated that occludin did not play an essential role in the initial attachment of HCV to target cells. Surface protein labeling experiments showed that both expression levels and cell surface localization of HCV (co)receptors CD81, scavenger receptor class B type I, and claudin-1 were not affected upon occludin knockdown. In addition, immunofluorescence confocal analysis showed that occludin interference did not affect subcellular distribution of the HCV (co)receptors analyzed. However, HCVgp fusion-associated events were altered after occludin silencing. In summary, we propose that occludin plays an essential role in HCV infection and probably affects late entry events. This observation may provide new insights into HCV infection and related pathogenesis | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 7 | |a Membrane Proteins |2 NLM | |
| 650 | 7 | |a OCLN protein, human |2 NLM | |
| 650 | 7 | |a Occludin |2 NLM | |
| 700 | 1 | |a Molina-Jiménez, Francisca |e verfasserin |4 aut | |
| 700 | 1 | |a Bartosch, Birke |e verfasserin |4 aut | |
| 700 | 1 | |a Cosset, François-Loïc |e verfasserin |4 aut | |
| 700 | 1 | |a Lavillette, Dimitri |e verfasserin |4 aut | |
| 700 | 1 | |a Prieto, Jesús |e verfasserin |4 aut | |
| 700 | 1 | |a Moreno-Otero, Ricardo |e verfasserin |4 aut | |
| 700 | 1 | |a Valenzuela-Fernández, Agustín |e verfasserin |4 aut | |
| 700 | 1 | |a Aldabe, Rafael |e verfasserin |4 aut | |
| 700 | 1 | |a López-Cabrera, Manuel |e verfasserin |4 aut | |
| 700 | 1 | |a Majano, Pedro L |e verfasserin |4 aut | |
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