Abstract
Abuse of anabolic androgenic steroids (AAS) is associated with serious side effects, such as hypertension and fluid retention. Renal alpha(1)- and alpha(2)-adrenoceptors are implicated in the regulation of blood pressure and fluid balance. In the present study, the levels of renal alpha(1A)-, alpha(1B)-, alpha(2A)- and alpha(2B)-adrenoceptors, and spleen alpha(1B)-adrenoceptors, were quantified in tissue membranes from rats treated with the AAS nandrolone decanoate (15 mg/kg) for 14 days. The radioligands used were [(3)H]-prazosin and [(3)H]-RX821002. The nandrolone treatment caused a 50% reduction of kidney alpha(1B)-adrenoceptors (from 15 fmol/mg protein in control rats to 6.5 fmol/mg protein in treated rats). In contrast, the levels of kidney alpha(1A)-, alpha(2A)- and alpha(2B)-, and spleen alpha(1B)-adrenoceptors were unaffected. These results raise the possibility that a decreased level of kidney alpha(1B)-adrenoceptors may cause some of the effects observed on blood pressure and fluid balance in heavy abuse of AAS.
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