Abstract

We studied multidrug transport in human autoimmune T line cells and peripheral blood leukocytes, because muitidrug transport is pleiotropically limiting the intracellular accumulation of immunosuppressive and chsmotherapeutie agents. We observed that a subpopulation of peripheral blood leukocytes containing CD4+. CD8+ and Ig+ lymphocytes expressed a muitidrug transport system. Lymphocytic muitidrug transport was seen with all peripheral blood samples analyzed, but showed considerable variations between individuals. In further studies with human lymphocytic cell lines multidrug transport was seen with 1823 human CD4+ T cell lines, interestingly, expression of multidrug transport was independent of T cell activation. No significant transport was observed with EBV-transformed human B lymphocytes, rat T line cells or rat, mouse, or guinea pig leukocytes.

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