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Intracerebroventricular (icv) injection of alpha-human atrial natriuretic polypeptide (alpha hANP) or alpha-rat ANP (0.6 and 3 nmol/rat) elicited an increase in plasma GH levels both in conscious freely moving rats and in urethane-anesthetized rats when given at the trough of spontaneous GH secretion. Antiserum specific for rat GRF did not affect the plasma GH increase induced by icv injection of alpha hANP. Intracerebroventricular injection of alpha ANP (3 nmol/rat) failed to stimulate GH secretion in conscious rats pretreated with cysteamine (30 mg/100 g BW, sc), a depletor of somatostatin (SRIF), and in conscious rats during constant iv infusion of SRIF (55 ng/ml). GH release induced by iv injection of synthetic rat GRF (200 ng/100 g BW) was exaggerated by alpha hANP (3 nmol/rat, icv) in conscious rats. These results suggest that central ANP stimulates pituitary GH secretion possibly by inhibiting SRIF release from the hypothalamus in the rat.
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