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Brain melanocortin receptors: from cloning to function

R A Adan¹, W H Gispen

¹Department of Medical Pharmacology, Rudolf Magnus Institute for Neurosciences, Utrecht University, The Netherlands. adan@med.ruu.nl

|January 1, 1997

Summary

The melanocortin (MC) system in the brain, including MC receptors, influences grooming, blood pressure, and weight. Some MC effects are not mediated by cloned brain MC receptors.

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Area of Science:

Neuroscience
Endocrinology
Pharmacology

Background:

The cloning and characterization of brain melanocortin (MC) receptors have advanced understanding of the MC system.
MC receptors are involved in various physiological processes, including grooming, blood pressure regulation, and energy homeostasis.

Purpose of the Study:

To review the structure, expression, and function of brain MC receptors.
To discuss the role of MC receptors in mediating various physiological and behavioral effects.
To highlight MC receptor-independent effects of melanocortins.

Main Methods:

Review of literature on MC receptor cloning, expression, and ligand identification.
Analysis of studies investigating MC receptor involvement in physiological responses.
Comparison of MC receptor-mediated and non-mediated effects.

Main Results:

MC receptors are implicated in melanocortin-induced grooming, blood pressure reduction, and weight control.
Functional opioid antagonism, anti-pyretic, and anti-inflammatory effects are likely MC receptor-mediated.
Certain melanocortin effects, such as on avoidance behavior and blood pressure increase by gamma 2-MSH, are not mediated by cloned brain MC receptors.

Conclusions:

The melanocortin system, particularly brain MC receptors, plays a significant role in regulating diverse physiological functions.
Further research is needed to fully elucidate the mechanisms underlying all melanocortin actions.
Understanding MC receptor pharmacology is crucial for developing targeted therapeutics.

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