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We studied the interactions between human herpesvirus 6B (HHV-6B) and its host cell. Productive infections of T-cell lines led to G1/S- and G2/M-phase arrest in the cell cycle concomitant with an increased level and enhanced DNA-binding activity of p53. More than 70% of HHV-6B-infected cells did not bind annexin V, indicating that the majority of cells were not undergoing apoptosis. HHV-6B infection induced Ser20 and Ser15 phosphorylation on p53, and the latter was inhibited by caffeine, an ataxia telangiectasia mutated kinase inhibitor. Thus, a productive HHV-6B infection suppresses T-cell proliferation concomitant with the phosphorylation and accumulation of p53.

Human Herpesvirus 6B Induces Cell Cycle Arrest Concomitant with p53 Phosphorylation and Accumulation in T Cells