Optic nerve stimulation-induced increase of release of 3h-glutamate and 3h-aspartate but not 3h-gaba from the suprachiasmatic nucleus in slices of rat hypothalamus

Shyh Yuh Liou, Shigenobu Shibata, Katsunori Iwasaki, Showa Ueki

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156 Citations (Scopus)


This study investigates the possibility of glutamate and/or aspartate as an excitatory transmitter in the retinohypothalamic fibers' terminal within the anterior hypothalamus, including the suprachiasmatic nucleus (SCN). We studied the release of [3]H-Glu and 3H-Asp from the SCN of rat hypothalamic slices produced by optic nerve stimulation. Stimulation of the optic nerve released 3H-Glu, 3H-Asp but not 3H-GABA, while stimulation of the SCN released all three. These releases were suppressed in both Ca2+ free Krebs and tetrodotoxin (TTX) 1 μM containing Krebs. The present result with previous electrophysiological observations strongly suggest that glutamate and/or aspartate are included in this retinohypothalamic termination, while GABA is included in intrinsic and/or extrinsic neurons of the SCN, excluding the terminal of the retinohypothalamic fibers.

Original languageEnglish
Pages (from-to)527-531
Number of pages5
JournalBrain Research Bulletin
Issue number4
Publication statusPublished - 1986 Apr
Externally publishedYes


  • Electrophysiology
  • Excitatory amino acids
  • Release experiment
  • Retinohypothalamic pathway
  • Suprachiasmatic nucleus

ASJC Scopus subject areas

  • Neuroscience(all)


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