Horizontal knife cuts either ventral or dorsal to the hypthalamic paraventricular nucleus block testicular regression in golden hamsters maintained in short days

Shin Ichi T. Inouye*, Fred W. Turek

*Corresponding author for this work

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

The possible involvement of efferent pathways from the suprachiasmatic nucleus (SCN) in the photoperiodic regulation of reproduction was studied by measuring the testis size of hamsters bearing a horizontal knife cut either ventral or dorsal to the hypothalamic paraventricular nucleus (PVN) that were transferred from photostimulatory long days (light:dark (L:D) 14:10 h) to non-stimulatory short days (L:D 6:18 h). Knife cuts placed either ventral or dorsal to the PVN blocked testicular regression induced by exposure to short days. These results indicate that efferent fibers running dorsally from the SCN to the PVN are involved in relaying photoperiodic information from the SCN to the PVN. Furthermore, recently-defined efferents that leave the PVN dorsally and terminate in the spinal cord appear to be responsible for relaying seasonal information about day-length to the pineal-reproductive axis of hamsters.

Original languageEnglish (US)
Pages (from-to)102-107
Number of pages6
JournalBrain research
Volume370
Issue number1
DOIs
StatePublished - Apr 2 1986

Keywords

  • paraventricular nucleus
  • photoperiodism
  • pineal gland
  • rhythm
  • suprachiasmatic nucleus

ASJC Scopus subject areas

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

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