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Human herpesvirus 6 envelope cholesterol is required for virus entry
Honglan Huang1, Yongmei Li1, Tomohiko Sadaoka2
1Department of Microbiology, Osaka University, Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
The Journal of General Virology
|January 25, 2006
Summary
Cholesterol in human herpesvirus 6 (HHV-6) envelopes is crucial for infectivity. Removing cholesterol from HHV-6 virions stops infection, but adding it back restores infectivity, highlighting cholesterol's role in viral entry.
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- Human herpesvirus 6 (HHV-6) is a significant human pathogen.
- The composition and function of viral envelopes are critical for infectivity.
- The specific role of cholesterol in the HHV-6 envelope remains incompletely understood.
Purpose of the Study:
- To investigate the role of cholesterol within the human herpesvirus 6 (HHV-6) envelope.
- To determine the impact of cholesterol depletion and repletion on HHV-6 infectivity and entry mechanisms.
Main Methods:
- Utilized methyl-beta-cyclodextrin (MbetaCD) to selectively deplete cholesterol from HHV-6 virions.
- Assessed viral infectivity following cholesterol manipulation.
- Monitored viral binding to host cells.
- Evaluated HHV-6-induced cell fusion.
Main Results:
- Depletion of cholesterol from HHV-6 virions using MbetaCD completely abolished viral infectivity.
- The addition of exogenous cholesterol successfully rescued the infectivity of cholesterol-depleted HHV-6.
- MbetaCD treatment had only a minor effect on HHV-6 binding to cells.
- Envelope cholesterol depletion significantly impaired HHV-6 infectivity and reduced HHV-6-mediated cell fusion.
Conclusions:
- Cholesterol is an essential component of the HHV-6 envelope.
- The cholesterol present in the HHV-6 envelope plays a critical role in the viral fusion process.
- Cholesterol is a key determinant for efficient viral entry of HHV-6 into host cells.