Crossref journal-article
Wiley
Journal of Neurochemistry (311)
Abstract

Abstract:Neurotrophic factors (NTFs) can protect against or sensitize neurons to excitotoxicity. We studied the role played by various NTFs in the excitotoxic death of purified embryonic rat motor neurons. Motor neurons cultured in brain‐derived neurotrophic factor, but not neurotrophin 3, glial‐derived neurotrophic factor, or cardiotrophin 1, were sensitive to excitotoxic insult. BDNF also induces excitotoxic sensitivity (ES) in motor neurons when BDNF is combined with these other NTFs. The effect of BDNF depends on de novo protein and mRNA synthesis. Reagents that either activate or inhibit the 75‐kDa NTF receptor p75NTRdo not affect BDNF‐induced ES. The low EC50for BDNF‐induced survival and ES suggests that TrkB mediates both of these biological activities. BDNF does not alter glutamate‐evoked rises of intracellular Ca2+, suggesting BDNF acts downstream. Both wortmannin and LY294002, which specifically block the phosphatidylinositol 3‐kinase (PI3K) intracellular signaling pathway in motor neurons, inhibit BDNF‐induced ES. We confirm this finding using a herpes simplex virus (HSV) that expresses the dominant negative p85 subunit of PI3K. Infecting motor neurons with this HSV, but not a control HSV, blocks activation of the PI3K pathway and BDNF‐induced ES. Through the activation of TrkB and the PI3K signaling pathway, BDNF renders developing motor neurons susceptible to glutamate receptor‐mediated cell death.

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Fryer, H. J. L., Wolf, D. H., Knox, R. J., Strittmatter, S. M., Pennica, D., O’Leary, R. M., Russell, D. S., & Kalb, R. G. (2000). Brain‐Derived Neurotrophic Factor Induces Excitotoxic Sensitivity in Cultured Embryonic Rat Spinal Motor Neurons Through Activation of the Phosphatidylinositol 3‐Kinase Pathway. Journal of Neurochemistry, 74(2), 582–595. Portico.

Authors 8
  1. Hugh J. L. Fryer (first)
  2. Daniel H. Wolf (additional)
  3. Ronald J. Knox (additional)
  4. Stephen M. Strittmatter (additional)
  5. Diane Pennica (additional)
  6. Rhona M. O'Leary (additional)
  7. David S. Russell (additional)
  8. Robert G. Kalb (additional)
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Dates
Type When
Created 22 years, 5 months ago (March 12, 2003, 1:43 a.m.)
Deposited 1 year, 7 months ago (Jan. 3, 2024, 11:41 a.m.)
Indexed 1 year, 1 month ago (July 29, 2024, 8:32 a.m.)
Issued 25 years, 6 months ago (Feb. 1, 2000)
Published 25 years, 6 months ago (Feb. 1, 2000)
Published Online 23 years, 8 months ago (Dec. 25, 2001)
Published Print 25 years, 6 months ago (Feb. 1, 2000)
Funders 0

None

@article{Fryer_2000, title={Brain‐Derived Neurotrophic Factor Induces Excitotoxic Sensitivity in Cultured Embryonic Rat Spinal Motor Neurons Through Activation of the Phosphatidylinositol 3‐Kinase Pathway}, volume={74}, ISSN={1471-4159}, url={http://dx.doi.org/10.1046/j.1471-4159.2000.740582.x}, DOI={10.1046/j.1471-4159.2000.740582.x}, number={2}, journal={Journal of Neurochemistry}, publisher={Wiley}, author={Fryer, Hugh J. L. and Wolf, Daniel H. and Knox, Ronald J. and Strittmatter, Stephen M. and Pennica, Diane and O’Leary, Rhona M. and Russell, David S. and Kalb, Robert G.}, year={2000}, month=feb, pages={582–595} }