Heterodimerization of hypothalamic G-protein-coupled receptors involved in weight regulation.

Abstract:

BACKGROUND:Melanocortin 3 and 4 receptors (MC3R and MC4R) are known to play an essential role in hypothalamic weight regulation. In addition to these two G-protein-coupled receptors (GPCRs), a huge number of other GPCRs are expressed in hypothalamic regions, and some of them are involved in weight regulation. So far, homodimerization was shown for a few of these receptors. Heterodimerization of unrelated receptors may have profound functional consequence but heterodimerization of GPCRs involved in weight regulation was not reported yet. METHODS:A selective number of hypothalamically expressed GPCRs were cloned into a eukaryotic expression vector. Cell surface expression was demonstrated by an ELISA approach. Subcellular distribution was investigated by confocal laser microscopy. A sandwich ELISA and fluorescence resonance energy transfer (FRET) were used to determine protein-protein interaction. RESULTS:Via sandwich ELISA and FRET approach we could demonstrate a robust interaction of the MC4R with GPR7, both of which are expressed in the hypothalamic nucleus paraventricularis. Moreover, we determined a strong interaction of MC3R with the growth hormone secretagogue receptor expressed in the nucleus arcuatus. CONCLUSION:Identification GPCR heterodimerization adds to the understanding of the complexity of weight regulation and may provide important information to develop therapeutic strategies to treat obesity.

journal_name

Obes Facts

journal_title

Obesity facts

authors

Rediger A,Tarnow P,Bickenbach A,Schaefer M,Krude H,Gruters A,Biebermann H

doi

10.1159/000209862

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

80-6

issue

2

eissn

1662-4025

issn

1662-4033

pii

000209862

journal_volume

2

pub_type

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