[The effect of chloroquine on lymphocytic HLA-A and B antigens]

The author investigated the effect of 20%, 15%, 10%, 5%, 2.5%, 1.25% chloroquine on HLA-A,B antigens on lymphocytes and on the reaction HLA-A,B antigen-antibody. HLA-A,B antigens are not released by chloroquine from the lymphocyte surface and their expressivity does not change, as was revealed by examination of the micro-lymphocytotoxic and absorption test. Higher concentrations of chloroquine cause poly-reactivity of lymphocytes. A 20%, 15% and sometimes also 10% and 5% of chloroquine solution block the reaction HLA-A, B antigen--HLA antibodies. The reason for this is the destructive action of chloroquine on rabbit complement.