Prolyl hydroxylase inhibitors delay neuronal cell death caused by trophic factor deprivation.

Abstract:

:Nerve growth factor (NGF) serves a critical survival-promoting function for developing sympathetic neurons. Following removal of NGF, sympathetic neurons undergo apoptosis characterized by the activation of c-Jun N-terminal kinases (JNKs), up-regulation of BH3-only proteins including BcL-2-interacting mediator of cell death (BIM)(EL), release of cytochrome c from mitochondria, and activation of caspases. Here we show that two small-molecule prolyl hydroxylase inhibitors frequently used to activate hypoxia-inducible factor (HIF) - ethyl 3,4-dihydroxybenzoic acid (DHB) and dimethyloxalylglycine (DMOG) - can inhibit apoptosis caused by trophic factor deprivation. Both DHB and DMOG blocked the release of cytochrome c from mitochondria after NGF withdrawal, whereas only DHB blocked c-Jun up-regulation and phosphorylation. DHB, but not DMOG, also attenuated the induction of BIM(EL) in NGF-deprived neurons, suggesting a possible mechanism whereby DHB could inhibit cytochrome c release. DMOG, on the other hand, was substantially more effective at stabilizing HIF-2alpha and inducing expression of the HIF target gene hexokinase 2 than was DHB. Thus, while HIF prolyl hydroxylase inhibitors can delay cell death in NGF-deprived neurons, they do so through distinct mechanisms that, at least in the case of DHB, are partly independent of HIF stabilization.

journal_name

J Neurochem

authors

Lomb DJ,Straub JA,Freeman RS

doi

10.1111/j.1471-4159.2007.04873.x

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

1897-906

issue

5

eissn

0022-3042

issn

1471-4159

pii

JNC4873

journal_volume

103

pub_type

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