In vivo measurement of enhanced agouti-related peptide release in the paraventricular nucleus of the hypothalamus through Gs activation of agouti-related peptide neurons

Authors

  • Zhenzhong Cui National Institute of Health
  • Adam S. Smith University of Kansas

DOI:

https://doi.org/10.14440/jbm.2019.288

Keywords:

AgRP, DREADD, in vivo microdialysis, arcuate nucleus of the hypothalamus

Abstract

Agouti-related peptide (AgRP) neurons of the hypothalamus play a role in hunger-triggered food intake, stability of body weight, and long-term energy balance. A recent study showed that activation of the Gs-linked G protein-coupled receptors (GCPR) expressed by hypothalamic AgRP neurons promotes a sustained increase in food intake. Enhanced AgRP release has been the postulated underlying mechanism. Here, we confirmed that activation of Gs-coupled receptors expressed by AgRP neurons in the arcuate nucleus (ARC) of the hypothalamus, which is the primary brain region for the synthesis and release of AgRP, leads to increased release of AgRP in the paraventricular nucleus of the hypothalamus (PVN). We were unable to confirm changes in AgRP expression or intracellular content using traditional histological techniques. Thus, we developed an assay to measure AgRP in the extracellular fluid in the brain using large molecular weight cut-off microdialysis probes. Our technique enables assessment of brain AgRP pharmacokinetics under physiological conditions and in response to specific pharmacological interventions designed to modulate AgRP signaling.

Author Biography

Adam S. Smith, University of Kansas

Department of Pharmacology & Toxicology

Assistant Professor

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Published

2019-07-04

How to Cite

1.
Cui Z, Smith AS. In vivo measurement of enhanced agouti-related peptide release in the paraventricular nucleus of the hypothalamus through Gs activation of agouti-related peptide neurons. J Biol Methods [Internet]. 2019Jul.4 [cited 2022May27];6(3):e116. Available from: https://jbmethods.org/jbm/article/view/288

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