Cited by 279Stress Responses and CortisolAdrenal Hormones and DisordersNeuropeptides and Animal Physiology

Neonatal endotoxin exposure alters the development of the hypothalamic-pituitary-adrenal axis: early illness and later responsivity to stress

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Shanks, N, Larocque, S, Meaney, MJ·1995·The Journal of Neuroscience

Abstract

The long-term consequences of neonatal endotoxin exposure on hypothalamic-pituitary-adrenal axis (HPA) function were assessed in adult female and male Long-Evans rats. At 3 and 5 d of age, pups were administered endotoxin (Salmonella enteritidis, 0.05 mg/kg, i.p.) at a dose that provokes a rapid and sustained physiological response, but with no mortality. As adults, neonatally endotoxin-treated animals exhibited significantly greater adrenocorticotrophic hormone (ACTH) and corticosterone responses to restraint stress than controls. In addition, dexamethasone pretreatment was less effective in suppressing ACTH responses to restraint stress in endotoxin-treated animals than in controls, suggesting decreased negative-feedback sensitivity to glucocorticoids. Neonatal endotoxin treatment elevated resting-state median eminence levels of corticotropin-releasing hormone (CRH) and arginine vasopressin in adult male animals, and arginine vasopressin in both adult males and females. Neonatal exposure to endotoxin also increased CRH mRNA expression in the paraventricular nucleus of the hypothalamus of adult males, with no difference in females. Finally, glucocorticoid receptor density was reduced across a wide range of brain regions in the neonatal endotoxin-treated, adult animals. These data illustrate the interactive nature of immune and endocrine systems during development. It appears that endotoxin exposure during critical stages of development decreases glucocorticoid negative-feedback inhibition of ACTH secretagogue synthesis, thus increasing HPA responsiveness to stress. The implication of these findings is that exposure to gram-negative LPS in early life can alter the development of neural systems which govern endocrine responses to stress and may thereby predispose individuals to stress-related pathology.

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Crossref · 10.1523/jneurosci.15-01-00376.1995

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  • Exposure of neonatal animals to low-dose endotoxins resulted in activation of Toll-like receptors.

    “Exposure of neonatal animals to low-dose endotoxins resulted in the activation of TLRs (364, 365).”
  • Neonatal animals exposed to low-dose endotoxins showed long-term HPA axis alterations, with increased mean glucocorticoid concentrations resulting from an increase in glucocorticoid pulse frequency and amplitude.

    “In addition, they showed long-term HPA axis alterations in activity, as evidenced by increased mean glucocorticoid concentrations resulting from an increase in glucocorticoid pulse frequency and amplitude.”
  • Colonization by microbiota regulates expression of critical HPA axis genes in hippocampus and modulates hippocampal serotonin concentration, which affects HPA activation.

    “Colonization by microbiota has been shown to regulate the expression of critical HPA axis genes in hippocampus and modulate hippocampal serotonin concentration, which also affects HPA activation (Luo et al., 2018; Farzi et al., 2015; Shanks et al., 1995; Clarke et al., 2013).”

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Research works printed but not linked: 5

  1. Bhatnagar S, Shanks N, Meaney MJ (in press) Hypothalamic-pitui- tary-adrenal function in chronic, intermittently cold stressed handled and nonhandled rats. J Neuroendocrinol, in press.
  2. O'Grady MP, Hall NRS (199 1) Long-term effects of neuroendocrine- immune interactions during early development. In: Psychoneuroim- munology, Second Edition (Ader R, Felten DL, Cohen N, eds), pp 561-572. San Diego: Academic.
  3. Shanks N, LaRocque S, Meaney MJ (in press a) Hypothalamic-pi- tuitary-adrenal responses to endotoxin challenge in neonatal rats: me- diation via CRH. J Neuroendocrinol, in press.
  4. Shanks N, McCormick CM, Meaney MJ (in press b) Sex differences in HPA responses to endotoxin challenge in the neonate: reversal by gonadectomy. Dev Brain Res, in press.
  5. Viau V, Meaney MJ (in press) Androgen regulation of hypothalamic- pituitary-adrenal responses to stress in male rats: role of the medial preoptic area. J Neurosci, in press.

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Authors
Shanks, N., Larocque, S., & Meaney, M.
Affiliations
Douglas Mental Health University Institute (CA)
Venue
The Journal of Neuroscience
Published
1995-01-01
Volume
15
Issue
1
Pages
376-384
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2097726093
Cited by
278
References
66
Citations by year
2026: 3 · 2025: 3 · 2024: 3 · 2023: 4 · 2022: 3 · 2021: 11 · 2020: 9 · 2019: 5 · 2018: 7 · 2017: 16 · 2016: 12 · 2015: 9 · 2014: 10 · 2013: 10 · 2012: 18
FWCI
3.56
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Pittsburgh
  • Medical Research Council Canada
  • Medical Center, University of Pittsburgh
  • Natural Sciences and Engineering Research Council of Canada
  • Medical Research Council
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
lipopolysaccharide, hypothalamic-pituitary-adrenal axis, stress responsivity, glucocorticoid negative feedback, ACTH, corticosterone, restraint stress, corticotropin-releasing factor, vasopressin, paraventricular nucleus, endocrine-immune interaction, developmental programming, sex differences, Long-Evans rats
MeSH terms
Adrenocorticotropic Hormone, Animals, Animals, Newborn, Arginine Vasopressin, Corticotropin-Releasing Hormone, Dexamethasone, Endotoxins, Female, Hypothalamo-Hypophyseal System, Male, Median Eminence, Paraventricular Hypothalamic Nucleus, Pituitary-Adrenal System, Rats, Inbred Strains, Receptors, Glucocorticoid, Restraint, Physical, RNA, Messenger, Stress, Physiological, Transcortin, Rats

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