Selective Inhibition of Various Mitogen Responses in Human Lymphocytes
Adenosine and deoxyadenosine are known inhibitors of the in vitro proliferative response of peripheral blood lymphocytes(PBL) to various mitogens(1–7). Erythro-9-(2-hydroxy-3-nonyl)-adenine hydrochloride (EHNA), an inhibitor of the enzyme adenosine deaminase(ADA), potentiates the inhibitory effects of both adenosine and deoxyadenosine. The incorporation of3H-leucirie into protein appeared to be a more sensitive index of adenosine toxicity than the incorporation of3H-thymidine(1). A differential sensitivity of cultured human T and B lymphoblasts towards the toxic effects of adenosine and deoxyadenosine has been observed: T cells are more sensitive than B cells(8,9). On the basis of3H-thymidine incorporation, mouse splenic cells stimulated by lipopolysaccharide(LPS) were less sensitive to the addition of adenosine than the concanavalin A(ConA) stimulated cells (10). Using a plaque forming cell assay, a biphasic effect of adenosine was seen on the in vitro antibody production in mice; concentrations of adenosine around 1mM stimulated antibody production in vitro, whereas concentrations above 1.5 mM had inhibitory effects (10).
KeywordsPeripheral Blood Lymphocyte Proliferative Response Thymidine Uptake Human Peripheral Blood Lymphocyte Leucine Incorporation
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