Abstract
Phytohemagglutinin (PHA) markedly stimulates 3H-hypoxanthine incorporation by lymphocytes of normal subjects as revealed by radioautography. There is no corresponding increase in activity of hypoxanthine phosphoribosyltransferase (HPRT) in lysates but the level of phosphoribosylpyrophosphate (PRPP), the cosubstrate for the reaction, is higher. Lymphocytes from a patient with partial HPRT deficiency responded to PHA as did the normals, whereas the response in Lesch-Nyhan (LN) subjects was variable. PHA-stimulated lymphocytes from two LN patients showed some increase in 3H-hypoxanthine incorporation, while two others failed to respond. The observations provide further evidence of genetic heterogeneity among LN patients.
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