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. 1986 Oct;379:1–16. doi: 10.1113/jphysiol.1986.sp016237

Effects of synthetic adrenocorticotrophin on adrenal medullary responses to splanchnic nerve stimulation in conscious calves.

A V Edwards, D Hansell, C T Jones
PMCID: PMC1182881  PMID: 3031282

Abstract

Right medullary and various cardiovascular responses to stimulation of the peripheral end of the splanchnic nerve have been investigated in the presence and absence of exogenous adrenocorticotrophin, ACTH1-24, (5 ng min-1 kg-1). The adrenal-clamp technique was employed in conscious calves, after the pituitary stalk had been cauterized and they had recovered from anaesthesia. The intravenous infusion of ACTH1-24 increased the plasma ACTH concentration by about 1100 pg ml-1 and right adrenal venous output of cortisol by about 400 ng min-1 kg body weight-1. Stimulation of the splanchnic nerve at 4 Hz for 10 min had no effect on either arterial plasma ACTH concentration or the adrenal output of cortisol. Closely similar amounts of both adrenaline and noradrenaline were released in response to nerve stimulation in the presence and absence of exogenous ACTH. In contrast, the fall in adrenal vascular resistance of about 40%, which normally occurred in response to splanchnic nerve stimulation, was completely abolished by ACTH. The adrenal produced relatively large quantities of met-enkephalin-containing peptides. During splanchnic nerve stimulation the output of these increased 2-100-fold, at which time free met5-enkephalin accounted for only 10-20% of total. During ACTH infusion the output of free met5-enkephalin was reduced at rest and during nerve stimulation, but that of total met-enkephalin-containing peptides was unaffected. These results indicate that ACTH or an adrenal steroid may alter the processing of proenkephalin in the adrenal medulla acutely but not total opiate secretion. Alternatively, the presence of ACTH could act by influencing the population of chromaffin cells activated by splanchnic nerve stimulation.

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Selected References

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