By Rodolfo Paoletti, Dr. David Kritchevsky
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Extra resources for Advances in lipid research. / Volume 14
15. Changes in rat liver HMG-CoA reductase activity in rats weaned on day 21 and killed at the indicated times. Reproduced, with permission, from McNamara et al. (1972). Regulation ofHMG-CoA 29 Reductase ther increase from normal adult nadir levels to those of peak pup activity near midnight is blocked. The initial rise thus would appear to involve processes other than synthesis, possibly relief of inhibition of reductase activity or conversion to a catalytically more active form. D. POSSIBLE EXPLANATIONS FOR T H E PATTERN DEVELOPMENTAL While the presence of cholesterol in maternal milk (6 mg of cholesterol per gram of solids), and its absence from rat chow, might b e a factor both in the low reductase activities present during suckling and the dramatic rise in activity that follows weaning, the free and total cholesterol content of liver remains within ± 10% of adult levels from 0 to 30 days.
At present, there is insufficient information available to allow one to choose a pattern of interaction among these three classes of effectors that would adequately explain reductase regulation. Furthermore, action through factors other than hormones cannot at present be excluded. IX. Modulation of HMG-CoA Reductase Activity A. INTRODUCTION Concepts evolved early in the development of a field of research often are discarded in light of later knowledge. Less frequently, but by no means rarely, still further work suggests that these early concepts may, after all, have merit.
Insulin and Glucagon. Considerable evidence implicates insulin in the diurnal rhythm of reductase. In normal rats the serum insulin level undergoes a diurnal variation (Unger et al, 1963; Kaul and Berdanier, 1972) that temporally coincides with the rhythm of HMG-CoA reductase (Huber et al, 1973a; Nepokroeff et al, 1974). In streptozotocin-diabetic rats mean reductase activity is very low, and the variation in amplitude appears to be essentially abolished after 7 days (Nepokroeff et al, 1974) (Fig.
Advances in lipid research. / Volume 14 by Rodolfo Paoletti, Dr. David Kritchevsky