Cited by 557Stress Responses and CortisolAdrenal Hormones and DisordersNeuropeptides and Animal Physiology

Regulation of pituitary ACTH secretion during chronic stress

Aguilera, Greti·1994·Frontiers in Neuroendocrinology

Abstract

Maintenance of adequate levels of response of the hypothalamic-pituitary-adrenal axis during chronic stress is important for survival. Three basic patterns of response can be identified depending on the type of stress: (a) desensitization of ACTH responses to the sustained stimulus, but hyperresponsiveness to a novel stress despite elevated plasma glucocorticoid levels, as occurs in physical-psychological paradigms; (b) no desensitization of ACTH response to the repeated stimulus and hyperresponsiveness to a novel stress, as occurs during repeated painful stress and insulin hypoglycemia; and (c) small and transient increases in ACTH, but sustained elevations of plasma corticosterone and diminished ACTH responses. The level of response of the pituitary corticotroph is determined by differential regulation of the hypothalamic regulators, corticotropin-releasing hormone (CRH) and vasopressin (VP), and the sensitivity of the negative glucocorticoid feedback. While osmotic stimulation increases VP expression in magnocellular neurons of the paraventricular (PVN) and supraoptic nuclei of the hypothalamus, chronic stress paradigms with high pituitary responsiveness are associated with activation of CRH and CRH/VP parvicellular neurons of the PVN, predominantly of the VP-containing population. While moderate increase of CRH output is important for stimulation of POMC transcription, the increase of the VP:CRH secretion ratio appears to be important in maintaining the secretory capacity of the pituitary corticotroph during chronic stimulation. Decreased sensitivity of the glucocorticoid feedback, probably due to interaction of glucocorticoid receptors with transcription factors induced by CRH and VP, is critical for the maintenance of ACTH responses in the presence of elevated plasma glucocorticoid levels during chronic stress. Although both CRH and VP receptors are activated and undergo regulatory variations during chronic stress, only the changes in VP receptor levels are parallel to the changes in pituitary ACTH responsiveness. The inhibitory effect of chronic osmotic stimulation on ACTH secretion in spite of high circulating levels of VP is probably the result of diminished activity of parvicellular PVN neurons and downregulation of pituitary VP receptors. Although the exact interaction between regulatory factors and the molecular mechanisms controlling the sensitivity of the corticotroph during adaptation to chronic stress remain to be determined, it is clear that regulation of the proportional secretion of CRH and VP in the PVN, modulation of pituitary VP receptors, and the sensitivity to feedback inhibition play a critical role.

Integrity signals

Registry

Crossref · 10.1006/frne.1994.1013

Cites

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • CRH and AVP are both required as stimulatory inputs to corticotrope cells for a complete ACTH response in physiologically normal and various stressful conditions.

    “In essence, CRH and AVP are both required as stimulatory inputs to corticotrope cells for a complete ACTH response in physiologically normal as well as in various stressful conditions (32, 38, 48–51).”

Cited by

Sorted by citations

Authors
Aguilera, G.
Affiliations
National Institutes of Health (US)
Corresponding author
Aguilera, Greti
Venue
Frontiers in Neuroendocrinology
Publisher
Elsevier BV
Published
1994-12
Volume
15
Issue
4
Pages
321-350
ISSN
0091-3022 (ISSN-L)
OpenAlex
W2031934304
Cited by
557
References
0
Citations by year
2026: 10 · 2025: 11 · 2024: 14 · 2023: 16 · 2022: 11 · 2021: 12 · 2020: 11 · 2019: 14 · 2018: 11 · 2017: 17 · 2016: 21 · 2015: 19 · 2014: 14 · 2013: 18 · 2012: 18
FWCI
5.50
Type
journal article
Language
en
Open access
closed
Locations
  • Frontiers in Neuroendocrinology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
ACTH secretion, chronic stress, hypothalamic-pituitary-adrenal axis, corticotropin-releasing factor, vasopressin, corticotrophs, glucocorticoid negative feedback, paraventricular nucleus, supraoptic nucleus, osmotic stimulation, glucocorticoid receptor, stress adaptation, corticosterone, insulin-induced hypoglycemia
MeSH terms
Adrenocorticotropic Hormone, Animals, Corticosterone, Corticotropin-Releasing Hormone, Glucocorticoids, Homeostasis, Humans, Hypothalamus, Pituitary Gland, Stress, Physiological, Vasopressins

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review