Abstract
Previous studies have shown that endothelial cells in the central nervous system (CNS) of normal guinea-pigs constitutively express certain MHC class II determinants, whilst the expression of other determinants is apparent during the acute phase of chronic relapsing experimental allergic encephalomyelitis (CREAE). The expression of MHC class II determinants is retained by endothelial cells derived from normal guinea-pig brain tissue and maintained in culture. This present study demonstrates that the MHC class II molecules on these cells can be recognized by allogeneic lymphocytes, resulting in a proliferative response which is enhanced by the addition of exogenous IL-2. The endothelial cells were incapable of presenting either purified protein derivative or ovalbumin, but they could present autologous myelin basic protein (MBP), an encephalitogen implicated in the pathogenesis of EAE. The resulting lymphocyte proliferative response was of the same magnitude as that obtained when a control population of macrophages was used to present MBP. These results, therefore, suggest that cerebrovascular endothelia have the potential to play a role in the pathogenesis of EAE.
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