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The specific activity of acid phosphatase in male and female rats follows a circadian rhythm. Preincubation of liver microsomes with testosterone led to an increase of phosphatase activity and a loss of circadian rhythm. NADH 5 alpha-reductase was inactivated by several animal and bacterial acid and alkaline phosphatases while the acid phosphatase from potatoes was ineffective. The extent of inhibition depends on the course of circadian rhythm of NADH 5 alpha-reductase activity. Preincubation of microsomes in the presence of testosterone inhibited the NADH 5 alpha-reduction of testosterone. No such inhibition was observed after preincubation of microsomes with progesterone.

Circadian Rhythm of Acid Phosphatase Activity in Rat Liver Microsomes and Dependence of NADH 5α-Reductase on Phosphatase Activity