Effects of histamine on hippocampal pyramidal cells of the rat in vitro

H. L. Haas, R. W. Greene

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

The actions of bath applied histamine on CA1 pyramidal cells were investigated in hippocampal slices of the rat. Histamine caused a) a slight depolarization but no significant change in resting membrane conductance; b) an abbreviation of long afterhyperpolarizations after single action potentials, bursts of action potentials or TTX resistant spikes; c) a loss of accommodation of firing. In the presence of TEA or barium, histamine prolonged and increased the size and number of the slow TTX resistant spikes. A depolarizing plateau which follows such spikes was also increased by histamine. Evoked synaptic potentials were unaffected by histamine, but the population spike was increased. The frequency of spontaneous chloride dependent potentials, which reflect interneurone firing, was also increased. These effects considerably outlasted histamine application and were mimicked by the H2-agonist impromidine but not the H1-agonist thiazolethylamine, and blocked by the H2-antagonists cimetidine and metiamide but not the H1-antagonists mepyramine or the beta-antagonist propranolol. It is concluded that histamine, by activating H2-receptors, antagonizes a calcium mediated potassium conductance in hippocampal pyramidal cells without affecting calcium current. By this mechanism histaminergic afferent fibres could effectively regulate cortical responsiveness by selectively potentiating large excitatory inputs of target neurones.

Original languageEnglish (US)
Pages (from-to)123-130
Number of pages8
JournalExperimental Brain Research
Volume62
Issue number1
DOIs
StatePublished - Mar 1986

Fingerprint

Pyramidal Cells
Histamine
Histamine Agonists
Action Potentials
Impromidine
Metiamide
Calcium
Pyrilamine
Synaptic Potentials
Histamine H2 Receptors
Cimetidine
Interneurons
Barium
Baths
Evoked Potentials
Propranolol
In Vitro Techniques
Chlorides
Potassium
Neurons

Keywords

  • Calcium dependent potassium current
  • H-receptor
  • Hippocampus
  • Histamine

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Effects of histamine on hippocampal pyramidal cells of the rat in vitro. / Haas, H. L.; Greene, R. W.

In: Experimental Brain Research, Vol. 62, No. 1, 03.1986, p. 123-130.

Research output: Contribution to journalArticle

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