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Related Experiment Videos

Inverse agonism gains weight.

Roger A H Adan1, Martien J H Kas

  • 1Rudolf Magnus Institute of Neuroscience, Department of Pharmacology and Anatomy, University Medical Center, Universiteitsweg 100, 3584 CG Utrecht, The Netherlands. r.a.h.adan@med.uu.nl

Trends in Pharmacological Sciences
|June 26, 2003
PubMed
Summary

Agouti-related protein (AgRP) acts as an inverse agonist, not just an antagonist, by suppressing constitutive activity of melanocortin receptors. This discovery highlights inverse agonism

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Area of Science:

  • Neuroendocrinology
  • Receptor pharmacology

Background:

  • Inverse agonism is a newly recognized mechanism for receptor regulation.
  • Agouti-related protein (AgRP) is released in the brain and stimulates food intake.
  • AgRP interacts with brain melanocortin receptors involved in body weight control.

Purpose of the Study:

  • To characterize Agouti-related protein (AgRP) as an inverse agonist.
  • To elucidate the role of AgRP in regulating melanocortin receptor activity.
  • To establish the physiological relevance of inverse agonism in body weight regulation.

Main Methods:

  • Investigated the interaction of AgRP with melanocortin receptors (MC3R and MC4R).
  • Assessed the effect of AgRP on both agonist-induced and constitutive receptor activity.

Related Experiment Videos

  • Analyzed the balance between AgRP- and alpha-melanocyte-stimulating hormone (alpha-MSH)-containing neurons.

    • Main Results:

    • AgRP antagonizes alpha-MSH effects on melanocortin receptors.
    • AgRP suppresses the constitutive activity of MC3R and MC4R, identifying it as an inverse agonist.
    • Neuronal activity balance dictates melanocortin receptor activation.

    Conclusions:

    • Agouti-related protein (AgRP) functions as an endogenous inverse agonist.
    • Inverse agonism plays a significant physiological role in controlling body weight.
    • Understanding AgRP's inverse agonism offers new insights into metabolic regulation.