Summary
We have found that the 5-HT target tissue of denervated adult rat brain contains high levels of a serotonergic neurons related-trophic factor(s) [SNTF]. Specific denervation of 5-HT fibers from the hippocampus [by 5,7-dihydroxytryptamine injection in the afferent pathway] induces 5-HT homotypic collateral sprouting in a month. The 5-HT-denervated hippocampus was shown to be a rich environment for the growth of grafted fetal 5-HT neurons. Grafted fetal 5-HT neurons exhibited higher 5-HT levels and 5-HT synaptosomal high-affinity uptake, more dense fibers and larger cell bodies in the 5-HT-denervated hippocampus than in normal hippocampus. Extracts [hypotonic solution in high-speed supernatant fraction] obtained from the denervated hippocampus were found to be trophic in vitro and in vivo. Extracts placed in raphe cell culture [rich in 5-HT neurons] increased the 5-HT high-affinity uptake. Extracts when added to grafted 5-HT neurons increased the 5-HT content of fetal 5-HT neurons in the normal hippocampus. The grafted 5-HT neurons and trophic extracts were also tested in the cerebellum, a brain region with sparse 5-HT innervation. We found that grafted 5-HT neurons seldom survived in this brain region. The denervated hippocampal extracts greatly increased the survival rate of the grafted 5-HT neurons, and significantly increased the density of the fibers in the cerebellum. These observations indicate that brain derived SNTF is trophic to 5-HT neurons at three levels — survival, neurite extension and transmitter maturation.
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Zhou, F.C., Azmitia, E.C. (1991). A Neurotrophic Factor — SNTF — for Serotonergic Neurons. In: Fozard, J.R., Saxena, P.R. (eds) Serotonin: Molecular Biology, Receptors and Functional Effects. Birkhäuser Basel. https://doi.org/10.1007/978-3-0348-7259-1_6
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