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Department of Microbiology and Immunology, Northeastern Ohio Universities College of Medicine, Rootstown 44272, USA. jjd@neoucom.edu
Resveratrol, a phytoalexin, was found to inhibit herpes simplex virus types 1 and 2 (HSV-1 and HSV-2) replication in a dose-dependent, reversible manner. The observed reduction in virus yield was not caused by the direct inactivation of HSV by resveratrol nor inhibition of virus attachment to the cell. The chemical did, however, target an early event in the virus replication cycle since it was most effective when added within 1 h of cell infection, less effective if addition was delayed until 6 h post-infection and not effective if added 9 h post-infection. Resveratrol was also found to delay the cell cycle at S-G2-M interphase, inhibit reactivation of virus from latently-infected neurons and reduce the amount of ICP-4, a major immediate early viral regulatory protein, that is produced when compared to controls. These results suggest that a critical early event in the viral replication cycle, that has a compensatory cellular counterpart, is being adversely affected.
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