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Related Experiment Videos

[Ghrelin--structure, function and clinical applications].

J Bronský1, K Kotaska, R Průsa

  • 1Ustav klinické biochemie a patobiochemie UK 2. LF a FN Motol, Praha. bronsky@email.cz

Ceskoslovenska Fysiologie
|February 16, 2005
PubMed
Summary

Ghrelin, a hormone produced in the stomach, regulates appetite and metabolism. Its levels change with food intake and nutritional status, signaling hunger and impacting overall homeostasis.

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Area of Science:

  • Endocrinology
  • Neuroendocrinology
  • Metabolism

Context:

  • Ghrelin is a 28-amino acid peptide hormone originating primarily from gastric enteroendocrine cells.
  • It is also synthesized in the pancreas, kidneys, placenta, hypothalamus, and pituitary gland.
  • Gastrectomy significantly reduces plasma ghrelin levels by 65-80%.

Purpose:

  • To elucidate the multifaceted roles of ghrelin in human physiology.
  • To understand ghrelin's function as a key regulator of energy homeostasis.
  • To explore ghrelin's relationship with appetite, metabolism, and neuroendocrine responses.

Summary:

  • Ghrelin stimulates growth hormone, prolactin, and ACTH secretion.
  • It exhibits orexigenic effects, influences sleep-wake cycles, gastric function, cardiovascular parameters, and glucose metabolism.
  • Ghrelin acts as a counter-regulatory hormone to leptin, integrating metabolic and neuroendocrine signals during starvation.

Impact:

  • Ghrelin levels dynamically reflect short-term food intake and long-term nutritional status.
  • Decreased ghrelin is observed post-feeding and in obesity, while elevated levels occur during starvation and anorexia nervosa.
  • Negative correlations exist between ghrelin levels and BMI, body fat, adipocyte size, insulin, glucose, and leptin, highlighting its role as a hunger signal.

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