title: Increased lymphoproliferative response to human herpesvirus type 6A variant in multiple sclerosis patients.
abstract: Several reports have suggested an association of human herpesvirus 6 (HHV-6) and multiple sclerosis (MS) based on immunohistochemical demonstration of HHV-6 antigens in inflammatory lesions, detection of increased HHV-6 specific serum antibody titers, and amplification of HHV-6 DNA from sera and cerebrospinal fluid of MS patients but not in controls. Characterization of the cellular immune response of MS patients to HHV-6 may further clarify the role of HHV-6 in MS and provide insight into the pathogenesis of this immune-mediated disease. We have compared lymphoproliferative responses to HHV-6A (U1102)-, HHV-6B (Z29)-, and HHV-7 (H7SB)-infected cell lysates in healthy controls and patients with MS. Most healthy controls (71%) proliferated to HHV-6B lysate, and fewer (33%) responded to the HHV-6A lysate. In contrast, 67% of MS patients had a lymphoproliferative response to HHV-6A, which is a significant increase in comparison with healthy controls. A similar frequency of lymphoproliferative response (78%) to HHV-6B was demonstrated in MS patients. Lymphoproliferation to HHV-7 lysate was demonstrated in 23% of healthy controls and 28% of MS patients. These results indicate that the lymphoproliferative response to the HHV-6A variant, which was recently reported to have greater neurotropism, is increased in MS patients.
authors.affiliation: Neuroimmunology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA.
authors.forename: S S
authors.initials: SS
authors.lastname: Soldan
authors.forename: T P
authors.initials: TP
authors.lastname: Leist
authors.forename: K N
authors.initials: KN
authors.lastname: Juhng
authors.forename: H F
authors.initials: HF
authors.lastname: McFarland
authors.forename: S
authors.initials: S
authors.lastname: Jacobson
mesh_terms: D000328:Adult; D002460:Cell Line; D015654:Herpesvirus 6, Human / Q000276:immunology*; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis; D008213:Lymphocyte Activation; D009103:Multiple Sclerosis / Q000276:immunology* / Q000378:metabolism
chemical_list: D007371:Interferon-gamma