RESUMO
Objective To study the lymphoproliferative responses to HHV-6(Human Herpesvirus-6,HHV-6)among patients with oral squamous cell carcinoma,and to discuss the role of HHV-6 in the pathogenesis of oral squamous cell carcinoma.Methods IgG antibody to HHV-6 in plasma was identified by indirect immunofluorescence(IIF).Immuno-magnetic beads were used to prepare CD4+ T cells and CD8+ T cells.The proliferation of CD4+ T cells,CD8+ T cells and PBMCs stimulated with HHV-6 or anti-CD3 antibodies was measured by 3H-thymidine uptake.The percentage of CD4+ C25+ Treg cells(Regulatory T cell,Treg)within the peripheral blood CD4+ T cell compartment was analyzed by flow cytometry.Results Significantly higher proportion of patients with oral squamous cell carcinoma had IgG antibody to HHV-6(8/8) in plasma as compared with those in control subjects(12/20);The proliferative responses of PBMCs and CD4+ T cells from patients with oral squamous cell carcinoma to HHV-6 were significantly decreased as compared to those from HHV-6-infected and healthy individuals(P