Leptin, the obese gene product, rapidly modulates synaptic transmission in the hypothalamus

Steven R. Glaum, Manami Hara, Vytautas P. Bindokas, Chong C. Lee, Kenneth S. Polonsky, Graeme I. Bell, Richard J. Miller*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

160 Scopus citations

Abstract

We examined the effects of leptin, the product of the obese gene, on synaptic transmission in the arcuate nucleus in rat hypothalamic slices. Both leptin and neuropeptide Y (NPY) reduced the evoked glutamatergic excitatory postsynaptic current in the arcuate nucleus. NPY also depressed the GABAergic inhibitory postsynaptic current, although leptin had no effect. Leptin also decreased the input resistance of arcuate neurons, and this was accompanied by the activation of an outward current at depolarized potentials. Leptin modulated Ca2+ signals in acutely isolated arcuate neurons. In some cells, the intracellular calcium concentration rise produced by 50 mM K+ was decreased, whereas in others it was increased. However, leptin produced no effects on synaptic transmission and little or no effect on Ca2+ signaling in the hypothalamus of Zucker fatty rats that contain mutated leptin receptors. On the other hand, NPY exhibited synaptic modulatory effects in Zucker lean and fatty rats. These data suggest that leptin can produce rapid synaptic modulatory effects in the arcuate nucleus, which may contribute to its effects on food intake.

Original languageEnglish (US)
Pages (from-to)230-235
Number of pages6
JournalMolecular pharmacology
Volume50
Issue number2
StatePublished - Aug 1996

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology

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