Responses of suprachiasmatic nucleus neurons to optic nerve stimulation in rat hypothalamic slice preparation

Shigenobu Shibata, Yutaka Oomura, Kiichi Hattori, Hitoshi Kita

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61 Citations (Scopus)

Abstract

Stimulation of the optic nerve evoked two positive waves (P1 and P2) with short latencies and a following large negative wave (N) in the suprachiasmatic nucleus (SCN) of hypothalamic slice preparations. The conduction velocities of the P1, P2 and N waves were assumed to be 2.9 m/s, 0.5 m/s and 0.4 m/s, respectively. The N wave disappeared in low Ca2+ medium and all responses disappeared when TTX was added to the medium at a concentration of 10-6 M. The results indicate that the P1 and P2 waves were responses of the optic nerve in the SCN and the N wave was that of SCN neurons. Following optic nerve stimulation 15 out of 212 single SCN neurons were excited; 10 were excited then inhibited, 14 were excited followed by rhythmic oscillation, and 4 were inhibited. The results demonstrate neuronal projections from the optic nerve to the SCN, and suggest that the major role of the excitatory influence on SCN neurons is responsible for the elevation of neuronal activity in the SCN during the daytime.

Original languageEnglish
Pages (from-to)83-89
Number of pages7
JournalBrain Research
Volume302
Issue number1
DOIs
Publication statusPublished - 1984 Jun 4
Externally publishedYes

Keywords

  • field potential
  • rat brain slice
  • retinohypothalamic pathway
  • suprachiasmatic nucleus
  • unit activity

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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