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Brain-derived neurotrophic factor promotes the survival and sprouting of serotonergic axons in rat brain
Open accessAbstract
A pathology of brain serotonergic (5-HT) systems has been found in psychiatric disturbances, normal aging and in neurodegenerative disorders including Alzheimer's and Parkinson's disease. Despite the clinical importance of 5-HT, little is known about the endogenous factors that have neurotrophic influences upon 5-HT neurons. The present study examined whether chronic pain parenchymal administration of the neurotrophins brain-derived neurotrophic factor (BDNF), neurotrophin-3 (NT-3) or NGF could prevent the severe degenerative loss of serotonergic axons normally caused by the selective 5-HT neurotoxin p-chloroamphetamine (PCA). The neurotrophins (5–12 micrograms/d) or the control substances (cytochrome c or PBS vehicle) were continuously infused into the rat frontoparietal cortex using an osmotic minipump. One week later, rats were subcutaneously administered PCA (10 mg/kg) or vehicle, and the 5-HT innervation was evaluated after two more weeks of neurotrophin infusion. As revealed with 5-HT immunocytochemistry, BDNF infusions into the neocortex of intact (non-PCA-lesioned) rats caused a substantial increase in 5-HT axon density in a 3 mm diameter region surrounding the cannula tip. In PCA-lesioned rats, intracortical infusions of BDNF completely prevented the severe neurotoxin-induced loss of 5-HT axons near the infusion cannula. In contrast, cortical infusions of vehicle or the control protein cytochrome c did not alter the density of serotonergic axons in intact animals, nor did control infusions prevent the loss of 5-HT axons in PCA-treated rats. NT-3 caused only a modest sparing of the 5-HT innervation in PCA-treated rats, and NGF failed to prevent the loss of 5-HT axon density. The immunocytochemical data were supported by neurochemical evaluations which showed that BDNF attenuated the PCA-induced loss of 5-HT and 5- HIAA contents and 3H-5-HT uptake near the infusion cannula. Thus, BDNF can promote the sprouting of mature, uninjured serotonergic axons and dramatically enhance the survival or sprouting of 5-HT axons normally damaged by the serotonergic neurotoxin PCA.
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Metadata
- Authors
- Mamounas, L., Blue, M., Siuciak, J., & Altar, C.
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 1995-12-01
- Volume
- 15
- Issue
- 12
- Pages
- 7929-7939
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- OpenAlex
- W1871684389
- Cited by
- 474
- References
- 5
- FWCI
- 3.94
- Type
- journal article
- Language
- en
- Open access
- hybrid
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