The hypothalamo-infundibular growth hormone-releasing hormone (GH-RH) system of the rat

István Merchenthaler, Csaba Csontos, Imre Kallo, Akira Arimura

Research output: Contribution to journalArticle

17 Citations (Scopus)


Two to 10 days after complete unilateral surgical isolation of the medial basal hypothalamus (MBH) or 3 months following neonatal monosodium glutamate (MSG) treatment, the presence of growth hormone-releasing hormone (GH-RH) immunoreactive neuronal structures was studied in rats using vibratome sections and GH-RH immunocytochemistry. (1) Neonatal MSG treatment resulted in a dramatic decrease of GH-RH immunoreactivity in the median eminence (ME), but not complete disappearance as reported earlier. (2) Unilateral complete deafferentation of the MBH caused only a slight decrease in GH-RH immunostaining in the posterior regions of the ipsilateral median eminence (ME). At this level GH-RH accumulation was observed in scattered transected fibers lateral to the cut, outside of the MBH. Our findings indicate that the arcuate nucleus is the major source of GH-RH immunoreactive structures in the ME. Although, however, in very small numbers, the existence of other sources of GH-RH terminals cannot be excluded.

Original languageEnglish
Pages (from-to)297-302
Number of pages6
JournalBrain research
Issue number2
Publication statusPublished - Jul 23 1986


  • deafferentation
  • immunocytochemistry
  • monosodium glutamate

ASJC Scopus subject areas

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

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