Secretion of Corticotrophin Releasing Factor from the Adrenal During Splanchnic Nerve Stimulation in Conscious Calves

Overview

Journal J Physiol

Specialty Physiology

Date 1988 Jun 1

PMID 2843642

Citations 14

Authors

A V Edwards

C T Jones

Affiliations

Soon will be listed here.

Abstract

1. The output of corticotrophin releasing factor-like immunoreactivity (CRF) from the adrenal gland has been investigated using the 'adrenal clamp' technique in conscious calves. 2. Stimulation of the peripheral end of the splanchnic nerve for 10 min increased the mean output of CRF progressively, so that it had risen by about twentyfold, to a peak incremental value of 24 +/- 4 pmol min-1 kg-1 at 10 min. This response was significantly increased by stimulating in bursts at 40 Hz for 1 s at 10 s intervals, which raised the mean CRF output by 44 +/- 7 pmol min-1 kg-1 at 10 min (P less than 0.05). 3. The mean output of adrenaline and noradrenaline rose more abruptly in response to splanchnic nerve stimulation with peak incremental values realized within 2.5 min. However, the ratios of adrenal CRF to catecholamine output were closely similar during the later stages of stimulation (7.5-10 min). There was a similarly abrupt rise in adrenal cortisol output in response to splanchnic nerve stimulation which was, nevertheless, linearly related to arterial plasma ACTH concentration throughout. 4. In hypophysectomized calves, administration of adrenocorticotrophic hormone (ACTH1-24) at a dose of 5 ng min-1 kg-1 reduced the output of adrenal CRF in response to splanchnic nerve stimulation by about 50% (P less than 0.05). 5. CRF isolated from adrenal venous effluent plasma, collected both at rest and during splanchnic nerve stimulation, was separated by reverse-phase high-pressure liquid chromatography and found to elute in a position identical to that of human 41CRF. This suggests that adrenal CRF is structurally closely similar to its pituitary counterpart.

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