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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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Regulation of pituitary cell function by adiponectin.

Francisca Rodriguez-Pacheco1, Antonio J Martinez-Fuentes, Sulay Tovar

  • 1Department of Cell Biology, Physiology and Immunology, University of Córdoba, E-14014 Córdoba, Spain.

Endocrinology
|October 14, 2006
PubMed
Summary

Adiponectin, an adipokine hormone, regulates pituitary hormone production by inhibiting growth hormone (GH) and luteinizing hormone (LH) secretion. This study reveals adiponectin

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Area of Science:

  • Neuroendocrinology
  • Hormone regulation
  • Cellular signaling

Background:

  • Adiponectin is an adipokine with known metabolic and anti-inflammatory effects.
  • Adiponectin receptors (AdipoR1, AdipoR2) are present in various tissues, including the pituitary.
  • Pituitary hormones influence adiponectin secretion and receptor expression.

Purpose of the Study:

  • To investigate adiponectin's role in regulating pituitary hormone production, specifically GH and LH.
  • To examine adiponectin's interaction with key regulators of somatotrophs and gonadotrophs.

Main Methods:

  • Primary rat pituitary cell cultures were used.
  • Effects of adiponectin on GH and LH secretion were measured.
  • Gene expression of adiponectin receptors (GHS-R, GHRH-R, GnRH-R) was analyzed.

Main Results:

  • Adiponectin inhibited basal and stimulated GH and LH release.
  • Adiponectin altered the expression of GHRH-R, GHS-R, and GnRH-R.
  • The pituitary was found to express adiponectin and its receptors.

Conclusions:

  • Adiponectin plays a neuroendocrine role in controlling somatotroph and gonadotroph function.
  • Local or systemic adiponectin influences pituitary hormone secretion.
  • Adiponectin signaling impacts GH and LH release pathways.