Aryl hydrocarbon hydroxylase and 16?-hydroxylase in cultured human lymphocytes

Abstract
Aryl hydrocarbon hydroxylase and 16α-hydroxylase were examined in intact, cultured human lymphocytes. The two microsomal mixed-function oxygenases had different pH optima and showed competitive inhibition for enzyme induction and activity. Population distributions were lognormal for both enzymes, giving apparent evidence for polygenic control. Induced levels of AHH were slightly higher among first-order relatives of lung or colon cancer patients than in the control group. The correlation coefficient (r) for AHH and SAH co-inducibility was −0.08, indicating no correlation and suggesting the absence of association between the two enzymes in man.