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Epstein-Barr virus induces actin polymerization in human B cells
I Melamed1, L Stein, C M Roifman
1Division of Immunology/Allergy, Hospital for Sick Children, Toronto, Ontario, Canada.
Journal of Immunology (Baltimore, Md. : 1950)
|September 1, 1994
Summary
Epstein-Barr virus (EBV) infection requires actin rearrangement. Blocking actin conversion inhibits EBV-induced B cell proliferation, revealing a key mechanism for viral entry.
Area of Science:
- Virology
- Cell Biology
- Immunology
Background:
- Epstein-Barr virus (EBV) selectively infects human and primate lymphocytes, inducing cell proliferation and immortalization.
- The precise molecular mechanisms underlying EBV infection tropism and cellular entry remain largely unknown.
- Actin cytoskeleton dynamics are implicated in the activation and transformation of various cell types.
Purpose of the Study:
- To investigate the role of actin rearrangement in Epstein-Barr virus (EBV) infection of B cells.
- To determine if EBV-induced B cell proliferation is dependent on actin dynamics.
Main Methods:
- Comparing the effects of transforming and non-transforming EBV strains on actin conversion.
- Utilizing botulinum C2 toxin and cytochalasin to inhibit globular actin (G-actin) to filamentous actin (F-actin) conversion.
- Assessing the impact of these inhibitors on EBV-induced B cell proliferation.
Main Results:
- A transforming strain of EBV, but not a non-transforming strain, stimulated the conversion of G-actin to F-actin.
- Inhibition of G-actin to F-actin conversion using botulinum C2 toxin or cytochalasin blocked EBV-induced B cell proliferation.
- These results demonstrate a direct link between actin rearrangement and EBV's ability to infect and proliferate B cells.
Conclusions:
- Actin rearrangement, specifically the conversion of G-actin to F-actin, is essential for Epstein-Barr virus (EBV) infection of B cells.
- Targeting actin dynamics may represent a novel strategy to inhibit EBV-mediated B cell proliferation and transformation.