The influence of serotonergic inputs on peptide neurons in the rat suprachiasmatic nucleus: An immunocytochemical study

The influence of serotonin (5-hydroxytryptamine; 5-HT) innervation on peptide-containing neurons in the rat suprachiasmatic nucleus (SCN) was investigated by peroxidase-anti-peroxidase (PAP) immunocytochemistry. The 5-HT neuronal system was chemically severed by 5,6-dihydroxytryptamine (5,6-DHT) inj...

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Veröffentlicht in:Neuroscience letters 1985-11, Vol.61 (3), p.273-277
Hauptverfasser: Kawakami, Fumio, Okamura, Hitoshi, Fukui, Kenji, Yanaihara, Chizuko, Yanaihara, Noboru, Nakajima, Teruo, Ibata, Yasuhiko
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Sprache:eng
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Zusammenfassung:The influence of serotonin (5-hydroxytryptamine; 5-HT) innervation on peptide-containing neurons in the rat suprachiasmatic nucleus (SCN) was investigated by peroxidase-anti-peroxidase (PAP) immunocytochemistry. The 5-HT neuronal system was chemically severed by 5,6-dihydroxytryptamine (5,6-DHT) injection into the medial forebrain bundle bilaterally. After this treatment, a marked decrease of vasoactive intestinal peptide (VIP)-like immunoreactivity in neuronal perikarya occurred in the SCN corresponding to a decrease in number of 5-HT immunoreactive fibers and terminals. However, no alteration of arginine-vasopressin-like immunoreactivity was detected between 5,6-DHT-treated animals and the controls. It is speculated that VIP-like immunoreactive neurons play an important role in the SCN under the influence of strong 5-HT innervation.
ISSN:0304-3940
1872-7972
DOI:10.1016/0304-3940(85)90476-8