Abstract:
BACKGROUND:Patients with multiple sclerosis (MS) have a decreased frequency of CD8+ T cells reactive to their own Epstein-Barr virus (EBV) infected B cells. We have proposed that this might predispose to the development of MS by allowing EBV-infected autoreactive B cells to accumulate in the central nervous system. The decreased CD8+ T cell response to EBV results from a general CD8+ T cell deficiency and also a decreased proportion of EBV-specific T cells within the total CD8+ T cell population. Because decreased HLA class I expression on monocytes and B cells has been reported in MS and could influence the generation and effector function of EBV-specific CD8+ T cells, the present study was undertaken to measure the expression of HLA molecules on B cells and monocytes in patients with MS. METHODS:We used flow cytometry to determine the proportions of T cells, natural killer cells, B cells and monocytes in peripheral blood mononuclear cells (PBMC) and to quantify the expression of HLA molecules on T cells, B cells and monocytes of 59 healthy subjects and 62 patients with MS who had not received corticosteroids or immunomodulatory therapy in the previous 3 months. RESULTS:The levels of HLA class I and class II molecules expressed on T cells, B cells and monocytes were normal in patients with MS, with the exception of two patients with secondary progressive MS with very low class II expression on B cells. In confirmation of previous studies we also found that the percentage of CD8+ T cells was significantly decreased whereas the percentage of CD4+ T cells and the CD4:CD8 ratio were significantly increased in patients with MS compared to healthy subjects. CONCLUSIONS:The decreased CD8+ T cell response to EBV-infected B cells in MS patients is not due to decreased HLA class I expression on monocytes or B cells. In a small proportion of patients decreased HLA class II expression on B cells might impair the CD8+ T cell response to EBV by reducing CD4+ T cell help.
journal_name
BMC Neuroljournal_title
BMC neurologyauthors
Pender MP,Csurhes PA,Pfluger CM,Burrows SRdoi
10.1186/1471-2377-11-95subject
Has Abstractpub_date
2011-08-03 00:00:00pages
95issn
1471-2377pii
1471-2377-11-95journal_volume
11pub_type
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