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Lipid rafts play an important role in the early stage of severe acute respiratory syndrome-coronavirus life cycle

Identifieur interne : 003B54 ( Main/Exploration ); précédent : 003B53; suivant : 003B55

Lipid rafts play an important role in the early stage of severe acute respiratory syndrome-coronavirus life cycle

Auteurs : Gui-Mei Li [Japon] ; Yong-Gang Li [Japon, Thaïlande] ; Masanobu Yamate [Japon] ; Shu-Ming Li [Japon] ; Kazuyoshi Ikuta [Japon, Thaïlande]

Source :

RBID : Pascal:07-0134374

Descripteurs français

English descriptors

Abstract

Lipid rafts are involved in the life cycle of many viruses. In this study, we showed that lipid rafts also play an important role in the life cycle of severe acute respiratory syndrome (SARS)-coronavirus (CoV). Cholesterol depletion by pretreatment of Vero E6 cells with methyl-β-cyclodextrin (MβCD) inhibited the production of SARS-CoV particles released from the infected cells. This inhibition was prevented by addition of cholesterol to the culture medium, indicating that the reduction of virus particle release was caused by the loss of cholesterol in the cell membrane. In contrast, cholesterol depletion at the post-entry stage (3 h post-infection) caused only a limited effect on virus particle release. Northern blot analysis revealed that the levels of viral mRNAs were significantly affected by pretreatment with MpCD, but not by treatment at 3 h post-infection. Interestingly, no apparent evidence for colocalization of angiotensin converting enzyme 2 with lipid rafts in the membrane of Vero E6 cells was obtained. These results suggest that lipid rafts could contribute to SARS-CoV infection in the early replication process in Vero E6 cells.


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<div type="abstract" xml:lang="en">Lipid rafts are involved in the life cycle of many viruses. In this study, we showed that lipid rafts also play an important role in the life cycle of severe acute respiratory syndrome (SARS)-coronavirus (CoV). Cholesterol depletion by pretreatment of Vero E6 cells with methyl-β-cyclodextrin (MβCD) inhibited the production of SARS-CoV particles released from the infected cells. This inhibition was prevented by addition of cholesterol to the culture medium, indicating that the reduction of virus particle release was caused by the loss of cholesterol in the cell membrane. In contrast, cholesterol depletion at the post-entry stage (3 h post-infection) caused only a limited effect on virus particle release. Northern blot analysis revealed that the levels of viral mRNAs were significantly affected by pretreatment with MpCD, but not by treatment at 3 h post-infection. Interestingly, no apparent evidence for colocalization of angiotensin converting enzyme 2 with lipid rafts in the membrane of Vero E6 cells was obtained. These results suggest that lipid rafts could contribute to SARS-CoV infection in the early replication process in Vero E6 cells.</div>
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