Abstract
Hypercholesterolemia and low testosterone concentrations in men are associated with a high risk factor for atherosclerosis. It is known that cholesterol serves as the major precursor for the synthesis of the sex hormones. The bioactive peptides of the renin–angiotensin-system localized in the gonads play a key role in the relation between cholesterol and testosterone by modulating steroidogenesis and inhibiting testosterone production. In the present work, we evaluated the effects of diet-induced hypercholesterolemia on circulating testosterone levels and its relationship with the testicular RAS-regulating specific aminopeptidase activities in male mouse. A significant decrease in serum circulating levels of testosterone was observed after induced hypercholesterolemia. The changes found in aminopeptidase activities suggest a role of Ang III and Ang IV in the regulation of steroidogenesis.
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