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Localization of serotonin in the hypothalamus and the mesencephalon of the guinea-pig

An immunohistochemical study using monoclonal antibodies

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Summary

The distribution of serotonin in the hypothalamus and the mesencephalon of guinea-pigs pretreated with both pargyline and L-tryptophan was investigated immunohistochemically using monoclonal antibodies to 5-HT. 5-HT-positive fibers and varicosities appeared distributed throughout the hypothalamus. Some areas showed a greater density of immunoreactivity: the suprachiasmatic nucleus, the region of the supraoptic crest, the area of the medial forebrain bundle, the ventral part of the nucleus ventromedialis, the median eminence and the ventral part of the mammillary bodies. 5-HT nerve fibers were also scattered in the posterior lobe of the pituitary. An extensive supraependymal plexus of immunoreactive axons was observed in most ventricular regions. No 5-HT positive cell bodies were present in the hypothalamus of the guinea-pig under our experimental conditions, whereas an intense serotonin immunoreactivity was detected in perikarya of the brain stem. 5-HT cell bodies were found predominantly in the raphe region including the nucleus raphe dorsalis and raphe medianus, nucleus interpeduncularis, reticular formation and dorsal area of the medial lemniscus.

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Warembourg, M., Poulain, P. Localization of serotonin in the hypothalamus and the mesencephalon of the guinea-pig. Cell Tissue Res. 240, 711–721 (1985). https://doi.org/10.1007/BF00216360

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