Abstract
Cerebral vascular endothelial cells (EC) isolated from human brain do not constitutively express class II MHC antigens. However, incubation in the presence of human interferon-gamma (IFNγ) resulted in the expression of both HLA-DR and -DP antigens. FACS analysis revealed that approximately 40% of the EC population expressed HLA-DR antigen. Quantitation by ELISA demonstrated that maximum expression was observed with 100 U/ml IFNγ for 4 days. Treatment with IFNγ also increased class II mRNA levels in all EC cultures tested.
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