Effects of adenosine on GABAergic synaptic inputs to identified ventrolateral preoptic neurons

N. L. Chamberlin, E. Arrigoni, T. C. Chou, T. E. Scammell, R. W. Greene, C. B. Saper

Research output: Contribution to journalArticle

97 Scopus citations

Abstract

The ventrolateral preoptic nucleus (VLPO) is a key regulator of behavioral state that promotes sleep by directly inhibiting brain regions that maintain wakefulness. Subarachnoid administration of adenosine (AD) or AD agonists promotes sleep and induces expression of Fos protein in VLPO neurons. Therefore, activation of VLPO neurons may contribute to the somnogenic actions of AD. To define the mechanism through which AD activates VLPO neurons, we prepared hypothalamic slices from 9 to 12-day-old rat pups and recorded from 43 neurons in the galaninergic VLPO cluster; nine neurons contained galanin mRNA by post hoc in situ hybridization. Bath application of AD (20 μM) to seven of these neurons had no direct effect but caused a significant decrease in the frequency of spontaneous miniature inhibitory postsynaptic currents in the presence of tetrodotoxin, indicating a presynaptic site of action. We conclude that AD-mediated disinhibition increases the excitability of VLPO neurons thus contributing to the somnogenic properties of AD.

Original languageEnglish (US)
Pages (from-to)913-918
Number of pages6
JournalNeuroscience
Volume119
Issue number4
DOIs
StatePublished - Jul 16 2003

Keywords

  • Adenosine
  • Galanin
  • Hypothalamus
  • Presynaptic
  • Sleep
  • mIPSC

ASJC Scopus subject areas

  • Neuroscience(all)

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