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1973) are those of rat milk and of suckling rat liver cytosol. , 1973) and hepatic (Krzemien and Haven, 1974) microsomes. E. SUMMARY At present, there is reliable evidence for modulation of reductase activity both in vivo and in vitro, b u t there is little or no evidence that establishes their mechanism, or their relationship to each other and to physiological control processes. Determining how the in vitro processes of activation and inactivation relate to the in vivo effects of hormones and diet will b e an interesting and important subject for future research.
1971) (Fig. 10) and material precipitated by antibody to purified reductase (Higgins and Rudney, 1973) rise and fall roughly in phase with the diurnal variation in reductase activity. , 1971). By kinetic analysis of activity data, Dugan et al. (1972) calculated that the rate of reductase synthesis increases 10-fold when the activity begins its diurnal rise. The diurnal increase in reductase synthesis appears to depend upon a preliminary period of de novo RNA synthesis (Edwards and Gould, 1974).
1972), and certain rat and mouse hepatomas (Goldfarb and Pitot, 1971). It has b e e n repeatedly demonstrated in many laboratories. However, the existence of rhythmic variations in reductase activity in other species, particularly in humans, or in other tissues has not yet b e e n established. , 1972). Only one other enzyme in the cholesterol metabolic pathway, cholesterol 7-a-hydroxylase, is known to have a diurnal rhythm. This enzyme catalyzes the first reaction in the catabolism of cholesterol to bile acids (Danielsson, 1972).