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Related Experiment Videos

Steroid control of central neuronal interactions and function.

G Fink1, R Rosie, W J Sheward

  • 1MRC Brain Metabolism Unit, University Department of Pharmacology, Edinburgh, Scotland.

The Journal of Steroid Biochemistry and Molecular Biology
|January 1, 1991
PubMed
Summary
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Steroids impact the brain through fast, intermediate, and long-term effects. Glucocorticoids and estrogen modulate the hypothalamic-pituitary-adrenal axis and reproductive functions, influencing hormone release and behavior.

Area of Science:

  • Neuroendocrinology
  • Steroid hormone action
  • Neurobiology

Background:

  • Steroids exert diverse temporal effects on the brain, categorized as fast (ms-s), intermediate (h-days), and long-term (days-weeks/irreversible).
  • This review focuses on intermediate and long-term reversible effects, particularly of glucocorticoids and estrogen.

Purpose of the Study:

  • To review the mechanisms of intermediate and long-term steroid actions on the brain.
  • To elucidate the roles of glucocorticoids and estrogen in neuroendocrine regulation and behavior.

Main Methods:

  • Review of existing literature on steroid feedback mechanisms.
  • Analysis of lesion and electrical stimulation studies.
  • In situ hybridization studies to examine gene expression.

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Main Results:

  • Glucocorticoid negative feedback involves modulation of pituitary responsiveness to corticotrophin-releasing factor-41 (CRF-41) and arginine vasopressin (AVP), acting primarily at the paraventricular nuclei.
  • Estrogen exhibits dose-dependent effects: low concentrations inhibit gonadotropin secretion, while high concentrations (pre-ovulatory surge) stimulate Luteinizing Hormone-Releasing Hormone (LHRH) synthesis and release, and increase pituitary responsiveness.
  • Estrogen's action on LHRH neurons may involve disinhibition via interneurons, potentially reducing proopiomelanocortin mRNA synthesis.

Conclusions:

  • Steroids, especially glucocorticoids and estrogen, exert complex temporal effects on neuroendocrine axes.
  • Estrogen orchestrates a coordinated cascade affecting LHRH and pituitary function, leading to the ovulatory surge and influencing mating behavior essential for species continuation.
  • The brain-pituitary system demonstrates remarkable efficiency in utilizing single steroids for complex regulatory functions.