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Related Experiment Videos

GPR39 receptor expression in the mouse brain.

Valerie R Jackson1, Hans-Peter Nothacker, Olivier Civelli

  • 1Department of Developmental and Cell Biology, University of California Irvine, Irvine, California 92697-4625, USA. ocivelli@uci.edu

Neuroreport
|May 19, 2006
PubMed
Summary

The GPR39 receptor, targeted by the anti-appetite hormone obestatin, is surprisingly not found in the hypothalamus. Highest GPR39 mRNA levels are in the amygdala, hippocampus, and auditory cortex.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Molecular Biology

Background:

  • Obestatin, a bioactive peptide hormone secreted by the stomach, functions as an appetite suppressant.
  • G protein-coupled receptor 39 (GPR39) has been identified as the specific receptor for obestatin.
  • While GPR39 is known to be present in the central nervous system, its exact location remains undetermined.

Purpose of the Study:

  • To investigate the precise localization of GPR39 mRNA expression within the central nervous system.
  • To correlate GPR39 expression patterns with the known or hypothesized sites of obestatin's anorexigenic effects.

Main Methods:

  • In-situ hybridization was employed to detect and quantify GPR39 mRNA.
  • Brain tissue from relevant regions was analyzed for GPR39 gene expression.

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Main Results:

  • GPR39 mRNA was detected at high levels in the amygdala, hippocampus, and auditory cortex.
  • Lower levels of GPR39 mRNA were observed in several other brain regions.
  • Notably, GPR39 mRNA expression was absent in the hypothalamus, a region previously expected to mediate obestatin's effects.

Conclusions:

  • The expression pattern of GPR39 in the brain does not align with the anticipated hypothalamic localization for obestatin's appetite-suppressing action.
  • These findings suggest a potentially novel mechanism or alternative brain regions involved in obestatin signaling and appetite regulation.
  • Further research is warranted to elucidate the functional significance of GPR39 in the amygdala, hippocampus, and auditory cortex in the context of appetite control.