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J Clin Endocrinol Metab. 2016 May;101(5):2122-9. doi: 10.1210/jc.2015-3291. Epub 2015 Dec 16.

Decreased Hypothalamic Glucagon-Like Peptide-1 Receptor Expression in Type 2 Diabetes Patients.

Author information

1
Diabetes Center and Department of Internal Medicine (J.S.t.K., L.v.B., R.G.I., M.D.), VU University Medical Center, 1007 MB Amsterdam, The Netherlands; Amsterdam Brain and Cognition Center (R.B., A.A.) and Department of Endocrinology and Metabolism (S.E.l.F.), Academic Medical Center, University of Amsterdam, 1100 DE Amsterdam, The Netherlands; and Department of Neuropsychiatric Disorders (D.F.S.), Netherlands Institute for Neuroscience, An Institute of the Royal Netherlands Academy of Arts and Sciences, 1105 BA Amsterdam, The Netherlands.

Abstract

CONTEXT:

Glucagon-like peptide-1 (GLP-1) and GLP-1 receptor agonist treatment in type 2 diabetes (T2DM) reduce blood glucose and food intake. It has been suggested that these effects are partly mediated through central GLP-1 receptors (GLP-1Rs). The rodent and nonhuman primate hypothalamus show clear GLP-1R expression. However, a detailed description of GLP-1R expression in the human hypothalamus is lacking, and it is unknown whether this expression is altered in T2DM patients.

OBJECTIVE:

The objective of the study was to investigate the GLP-1R distribution in the human postmortem hypothalamus and to determine whether hypothalamic GLP-1R expression is altered in T2DM patients.

DESIGN:

We investigated the distribution of GLP-1R expression throughout the human hypothalamus by means of in situ hybridization. We also performed quantifications of GLP-1R mRNA expression in two hypothalamic nuclei (ie, the paraventricular nucleus [PVN] and infundibular nucleus [IFN]), comparing patients with T2DM and control subjects.

RESULTS:

We found that GLP-1R mRNA was expressed in a number of hypothalamic nuclei including the PVN and the IFN, both involved in the regulation of energy metabolism. We observed sporadic colocalization of the GLP-1R in the IFN with the orgexigenic neuropeptide Y, agouti-related peptide, or proopiomelanocortin transcripts. Comparison of GLP-1R mRNA in the PVN and IFN between T2DM patients and control subjects revealed a decreased expression in T2DM patients.

CONCLUSIONS:

Our studies show that GLP-1R is widely expressed throughout the human hypothalamus. The decreased expression of GLP-1R in the PVN and IFN of T2DM patients may be related to the dysregulation of feeding behavior and glucose homeostasis in T2DM.

PMID:
26672638
DOI:
10.1210/jc.2015-3291
[Indexed for MEDLINE]

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