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Ghrelin: new molecular pathways modulating appetite and adiposity.

Ruben Nogueiras1, Lynda M Williams, Carlos Dieguez

  • 1Department of Physiology, University of Santiago de Compostela, Santiago de Compostela, Spain. ruben.nogueiras@usc.es

Obesity Facts
|October 27, 2010
PubMed
Summary

Ghrelin, a hunger hormone, influences appetite and body fat. This review explores new neuronal pathways and peripheral mechanisms affecting ghrelin

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Area of Science:

  • Endocrinology
  • Neuroscience
  • Metabolism

Background:

  • Ghrelin is a key endogenous peptide hormone regulating hunger and adiposity.
  • Central nervous system pathways significantly modulate ghrelin's actions.
  • Ghrelin receptor (GHS-R1a) activation impacts neuropeptide Y (NPY) and agoutirelated peptide (AgRP) levels, driving appetite.

Purpose of the Study:

  • To review novel roles of ghrelin in energy balance regulation.
  • To highlight newly identified neuronal pathways mediating ghrelin's effects.
  • To examine peripheral mechanisms contributing to increased adiposity via ghrelin.

Main Methods:

  • Literature review focusing on ghrelin signaling.
  • Analysis of molecular events downstream of ghrelin receptor activation.

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  • Investigation of ghrelin O-acyltransferase (GOAT) in ghrelin modification.

    • Main Results:

    • Characterization of molecular events leading to ghrelin's orexigenic effect.
    • Discovery of ghrelin O-acyltransferase (GOAT) for targeted ghrelin system modulation.
    • Identification of novel neuronal pathways and peripheral mechanisms influencing energy balance.

    Conclusions:

    • Ghrelin's complex role in energy balance extends beyond simple hunger signaling.
    • Targeting the ghrelin/GHS-R1a system, potentially via GOAT, offers therapeutic avenues.
    • Further research into ghrelin's neuronal and peripheral actions is crucial for understanding adiposity.