Leptin suppresses development of GLP-1 inputs to the paraventricular nucleus of the hypothalamus

Author:

Biddinger Jessica E1ORCID,Lazarenko Roman M1ORCID,Scott Michael M2,Simerly Richard1ORCID

Affiliation:

1. Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, United States

2. Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, United States

Abstract

The nucleus of the solitary tract (NTS) is critical for the central integration of signals from visceral organs and contains preproglucagon (PPG) neurons, which express leptin receptors in the mouse and send direct projections to the paraventricular nucleus of the hypothalamus (PVH). Here, we visualized projections of PPG neurons in leptin-deficient Lepob/ob mice and found that projections from PPG neurons are elevated compared with controls, and PPG projections were normalized by targeted rescue of leptin receptors in LepRbTB/TB mice, which lack functional neuronal leptin receptors. Moreover, Lepob/ob and LepRbTB/TB mice displayed increased levels of neuronal activation in the PVH following vagal stimulation, and whole-cell patch recordings of GLP-1 receptor-expressing PVH neurons revealed enhanced excitatory neurotransmission, suggesting that leptin acts cell autonomously to suppress representation of excitatory afferents from PPG neurons, thereby diminishing the impact of visceral sensory information on GLP-1 receptor-expressing neurons in the PVH.

Funder

National Institute of Diabetes and Digestive and Kidney Diseases

National Institute of Mental Health

Publisher

eLife Sciences Publications, Ltd

Subject

General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

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