Cholinergic modulation of appetite-related synapses in mouse lateral hypothalamic slice

Young-Hwan Jo, Denise Wiedl, Lorna W. Role

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Nicotine administration reduces appetite and alters feeding patterns; a major deterrent to smoking cessation is hyperphagia and resultant weight gain. We demonstrate here that lateral hypothalamic (LH) circuits involving melanin-concentrating hormone (MCH) neurons are subject to cholinergic modulation that may be related to the effects of nicotine on appetite control. Cholinergic input to the perifornical LH area of the mouse is confirmed by examination of immunostaining for vesicular acetylcholine (ACh) transporter (VAT) in conjunction with antibodies to MCH and the vesicular GABA transporter (vGABAT). vAChT-positive neurons border the LH, and VAT-positive projections are detected throughout the perifornical area. MCH-positive dendrites appear studded with vGABAT-positive contacts, consistent with recordings of GABAergic inputs to LH/MCH neurons identified by their location, morphology, electrophysiological profile, and MCH expression. Activation of presynaptic nicotinic ACh receptors (nAChRs) enhances GABAergic transmission. GABAergic transmission is potentiated by (1) direct nicotine application, (2) increasing local ACh concentration, and (3) stimulation of cholinergic projections. Based on pharmacological studies and comparisons of wild-type versus α7 nAChR subunit mutant mice, we propose that α7*-nAChRs are required for the modulation of GABAergic inputs in LH. Prenatal exposure to nicotine elicits a persistent elevation of GABAergic transmission in the LH of postnatal pups. Furthermore, GABAergic inputs to LH of prenatal nicotine-exposed pups are insensitive to subsequent nicotine challenge. Our studies support the hypothesis that nicotine administration or elevated cholinergic tone enhance inhibition of perifonical LH/MCH neurons via activation of presynaptic α7*- nAChRs.

Original languageEnglish (US)
Pages (from-to)11133-11144
Number of pages12
JournalJournal of Neuroscience
Volume25
Issue number48
DOIs
StatePublished - Nov 30 2005

Fingerprint

Appetite
Nicotine
Synapses
Cholinergic Agents
Nicotinic Receptors
Neurons
Cholinergic Receptors
Vesicular Acetylcholine Transport Proteins
Lateral Hypothalamic Area
Hyperphagia
Feeding Behavior
Smoking Cessation
Dendrites
Acetylcholine
Weight Gain
melanin-concentrating hormone
Pharmacology
Antibodies

Keywords

  • MCH
  • Motivation
  • Nicotine
  • Obesity
  • Orexin
  • Reward

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Cholinergic modulation of appetite-related synapses in mouse lateral hypothalamic slice. / Jo, Young-Hwan; Wiedl, Denise; Role, Lorna W.

In: Journal of Neuroscience, Vol. 25, No. 48, 30.11.2005, p. 11133-11144.

Research output: Contribution to journalArticle

Jo, Young-Hwan ; Wiedl, Denise ; Role, Lorna W. / Cholinergic modulation of appetite-related synapses in mouse lateral hypothalamic slice. In: Journal of Neuroscience. 2005 ; Vol. 25, No. 48. pp. 11133-11144.
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