Cited by 70Stress Responses and CortisolHypothalamic control of reproductive hormonesAdrenal Hormones and Disorders

The DOI matches its Crossref record; 18 of the 18 references it cites were found in a registry or an index.

Evidence of a corticotropin-releasing hormone pulse generator in the macaque hypothalamus

Abstract

The secretion of hormones from the hypothalamic-pituitary axis is, in general, characterized by an episodic pattern of release. In the adrenal axis, ACTH and cortisol levels in peripheral blood display irregularly pulsatile ultradian patterns that are superimposed on the well characterized circadian rhythm. While it is generally accepted that CRH is released from the hypothalamus in a similar manner, very few studies have actually examined the temporal release of CRH. To examine the temporal release of CRH directly, we have established an in vitro perifusion system using the hemisectioned macaque hypothalamus. Perifusate samples were collected at 10-min intervals for 20 h and assayed for CRH by RIA. In control animals, a very regular, pulsatile pattern of hormone release was present, with a pulse interval of 90 +/- 11 min. Although this interval closely approximates the average pulse interval of ACTH and cortisol in the human, the regular pattern revealed in our study has not been demonstrated previously in the adrenal axis in vivo and suggests that factors outside the hypothalamus play a major role in controlling adrenal hormone levels. When hypothalami were perifused with dexamethasone added to the culture medium, no change in pulsatile activity was detected, indicating that a site outside of the hypothalamus may function as the primary center of feedback inhibition by adrenal glucocorticoids in the central nervous system. Because the very regular pulses of CRH that we observed bear striking similarity to the circhoral pulses of GnRH, we speculate that CRH may play a more subordinate role in regulating the adrenal axis and that other releasing factors and/or feedback effects at the pituitary level may be more important in the generation of the irregularly pulsatile, circadian patterns of ACTH and cortisol seen in peripheral blood.

Overview

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Crossref · 10.1210/endo.130.5.1572307

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18 of 18 references verified0 citation errors · 0 not checkable

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Metadata

Authors
Mershon, J. L., Sehlhorst, C. S., Rebar, R. W., & Liu, J. H.
Affiliations
University of Cincinnati Medical Center (US)
Venue
Endocrinology
Published
1992-05
Volume
130
Issue
5
Pages
2991-2996
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W2034889240
Cited by
70
References
18
Citations by year
2026: 1 · 2024: 1 · 2023: 1 · 2022: 3 · 2020: 2 · 2019: 3 · 2018: 3 · 2017: 1 · 2016: 6 · 2015: 2 · 2014: 4 · 2013: 2 · 2012: 2
FWCI
0.20
Type
journal article
Language
en
Open access
closed
Locations
  • Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
Keywords
corticotropin-releasing factor, pulsatile hormone secretion, hypothalamus, macaque, hypothalamic-pituitary-adrenal axis, ACTH, cortisol, ultradian rhythms, circadian rhythm, glucocorticoid feedback inhibition, gonadotropin-releasing hormone, perifusion
MeSH terms
Animals, Corticotropin-Releasing Hormone, Dexamethasone, Female, Hypothalamus, Kinetics, Macaca fascicularis, Macaca mulatta, Male, Perfusion, Radioimmunoassay, Time Factors

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