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Neuroprotection of immortalized hippocampal neurones by brain-derived neurotrophic factor and Raf-1 protein kinase: role of extracellular signal-regulated protein kinase and phosphatidylinositol 3-kinase.

Abstract：

:We have investigated the molecular mechanisms of neurotrophin-mediated cell survival in HT22 cells, a murine cell line of hippocampal origin, expressing the brain-derived neurotrophic factor (BDNF) receptor TrkB as well as the TrkB.T1 splice variant. Stimulation with BDNF protected HT22-TrkB cells, but not HT22-TrkB.T1 cells, against programmed cell death induced by serum deprivation. BDNF did not, however, provide protection against oxidative glutamate toxicity, indicating that serum deprivation-induced cell death differs substantially from glutamate-induced cell death. Using a pharmacological strategy to block either the extracellular signal-regulated protein kinase (ERK) or the phosphatidylinositol 3-kinase (PI3) pathway, we show that activation of PI3 kinase is required for the neuroprotective activity of BDNF in HT22 cells. To further analyse the role of ERK in neuroprotection we expressed an inducible deltaRaf-1:ER fusion protein in HT22 cells. Activation of this conditionally active form of Raf-1 induced a sustained phosphorylation of ERK, and protected the cells from serum withdrawal-induced cell death. Inhibition of ERK activation at different time points revealed that a prolonged activation of ERK is essential to protect HT22 cells from cell death triggered by the withdrawal of serum, indicating that the duration of ERK activation is of major importance for its neuroprotective biological function.

journal_name

J Neurochem

journal_title

Journal of neurochemistry

authors

Rössler OG,Giehl KM,Thiel G

doi

10.1046/j.1471-4159.2003.02255.x

keywords:

subject

Has Abstract

pub_date

2004-03-01 00:00:00

pages

1240-52

issue

5

eissn

0022-3042

issn

1471-4159

pii

2255

journal_volume

88

pub_type

杂志文章

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