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Testicular gamma glutamyl-transpeptidase: an index of Sertoli cell function in man.

Many workers have studied testicular enzymes as specific markers of spermatogenesis (Bishop, 1968). However, the enzymes evaluated have primarily reflected the presence or absence of germ cells per se and have added little to our understanding of maturational events that was not already available by histological examination. We gamma glutamyl-transpeptidase cell rat enzyme spermatogenesis In vitamin -deficient rats, testicular levels of gamma glutamyl-transpeptidase were high, despite virtually complete germ cell depletion, although the activities of lactic dehydrogenase and sorbitol dehydrogenase fell in proportion to the reduced number of advanced germ cells. To assess the relationship of gamma glutamyl-transpeptidase to the functional integrity of the seminiferous tubule in man, we have measured its concentration in homogenates made from testicular biopsies of normal and infertile men with a variety of disorders of spermatogenesis. Eleven men were studied, and each subject was examined clinically to assess testicular function. Primary and secondary sexual development, presence of congenital somatic defects and testicular size (dimensions and volume) were evaluated. Three to five serial blood samples were obtained for measurements