Very little is known about the contribution of a low affinity neurotrophin receptor, p75, to neurotransmitter release. Here we show that nerve growth factor (NGF) induced a rapid release of glutamate and an increase of Ca2+ in cerebellar neurons through a p75-dependent pathway. The NGF-induced release occurred even in the presence of the Trk inhibitor K252a. The release caused by NGF but not brain-derived neurotrophic factor was enhanced in neurons overexpressing p75. Further, after transfection of p75-small interfering RNA, which down-regulated the endogenous p75 expression, the NGF-induced release was inhibited, suggesting that the NGF-induced glutamate release was through p75. We found that the NGF-increased Ca2+ was derived from the ryanodine-sensitive Ca2+ receptor and that the NGF-increased Ca2+ was essential for the NGF-induced glutamate release. Furthermore, scyphostatin, a sphingomyelinase inhibitor, blocked the NGF-dependent Ca2+ increase and glutamate release, suggesting that a ceramide produced by sphingomyelinase was required for the NGF-stimulated Ca2+ increase and glutamate release. This action of NGF only occurred in developing neurons whereas the brain-derived neurotrophic factor-mediated Ca2+ increase and glutamate release was observed at the mature neuronal stage. Thus, we demonstrate that NGF-mediated neurotransmitter release via the p75-dependent pathway has an important role in developing neurons.
Nerve Growth Factor-induced Glutamate Release Is via p75 Receptor, Ceramide, and Ca2+ from Ryanodine Receptor in Developing Cerebellar Neurons*
T. Numakawa,H. Nakayama,Shingo Suzuki,T. Kubo,F. Nara,Yumiko Numakawa,D. Yokomaku,T. Araki,T. Ishimoto,A. Ogura,T. Taguchi
Published 2003 in Journal of Biological Chemistry
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- Publication year
2003
- Venue
Journal of Biological Chemistry
- Publication date
2003-10-17
- Fields of study
Biology, Medicine, Chemistry
- Identifiers
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- Source metadata
Semantic Scholar, PubMed
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