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Related Experiment Videos

A novel endogenous corticotropin release inhibiting factor

E Redei1, P A Rittenhouse, S Revskoy

  • 1Department of Pharmacology, University of Pennsylvania, Philadelphia 19104, USA. e-redei@nwu.edu

Annals of the New York Academy of Sciences
|June 18, 1998
PubMed
Summary

Researchers identified a novel peptide, prepro-thyrotropin releasing hormone (TRH) 178-199, acting as a corticotropin release inhibiting factor (CRIF). This peptide regulates ACTH production and may play a role in autoimmune diseases like rheumatoid arthritis.

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Corticotrophs and peptides.

Archives of physiology and biochemistry·2002

Area of Science:

  • Neuroendocrinology
  • Immunology
  • Molecular Biology

Background:

  • Adrenocorticotropic hormone (ACTH) is crucial for stress response and glucocorticoid secretion.
  • A hypothalamic corticotropin release inhibiting factor (CRIF) has been theorized but not previously identified.
  • Thyroid hormones and glucocorticoids interact within the hypothalamic-pituitary-adrenal (HPA) axis.

Purpose of the Study:

  • To identify and characterize a novel endogenous CRIF.
  • To investigate the role of prepro-TRH 178-199 in regulating ACTH synthesis and secretion.
  • To explore the potential link between this CRIF, thyroid hormones, glucocorticoids, and autoimmune diseases such as rheumatoid arthritis.

Main Methods:

  • Identification of a 22 amino acid peptide, prepro-TRH 178-199.

Related Experiment Videos

  • In vitro assays to assess inhibition of ACTH synthesis and secretion.
  • In vivo studies to evaluate stress-induced ACTH secretion.
  • Analysis of peptide abundance in brain regions, including the median eminence.
  • Examination of gene expression markers for rheumatoid arthritis (RA) under varying thyroid hormone conditions.

    • Main Results:

    • Prepro-TRH 178-199 was identified as a potent inhibitor of basal and stimulated ACTH synthesis and secretion.
    • This peptide is abundant in the median eminence, with stress-dependent changes in concentration.
    • Thyroid hormone regulation of prepro-TRH 178-199 influences endogenous glucocorticoid levels.
    • Hypothyroidism exacerbated RA markers (IL-1 beta, MIP-1 alpha) and altered HPA activity.

    Conclusions:

    • Prepro-TRH 178-199 functions as an endogenous CRIF, physiologically regulating ACTH production.
    • Regulation of prepro-TRH is linked to thyroid hormones and impacts glucocorticoid levels.
    • This peptide may be a key factor in the pathogenesis of rheumatoid arthritis and other autoimmune diseases exacerbated by low glucocorticoids.