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Deregulation of the hypoxia inducible factor-1α pathway in monocytes from sporadic amyotrophic lateral sclerosis patients.

Abstract：

:The clinical course of the degenerative motor neuron disorder amyotrophic lateral sclerosis (ALS) is closely related to hypoxia. The normal response to hypoxia involves two pathways in particular: the hypoxia inducible factor 1α (HIF-1α) pathway (which notably controls the synthesis of vascular endothelial growth factor (VEGF)) and the nuclear factor kappa B (NF-κb) pathway (responsible for the production of inflammatory mediators, including prostaglandin E2 (PGE2)). Defects in VEGF gene expression are known to cause motor neuron degeneration in animal models. Circulating monocytes are precursors of the microglia, which are involved in the pathogenesis of ALS. To establish whether the HIF-1 and/or NF-κB pathways are deregulated during hypoxia in early-stage, sporadic ALS, we analyzed the response to acute (1 h) and prolonged (24 h) hypoxia in monocytes from ALS and healthy controls. We measured protein expression and mRNA transcription for VEGF, HIF-1, HIF-2, prolyl hydroxylases 1 and 2 (PHD-1 and -2, part of the HIF proteasome-dependent degradation pathway) and their modulation by PGE2. Our results showed that (i) the HIF-1 (but not HIF-2) and VEGF production induced by acute and prolonged hypoxia was selectively and markedly altered in ALS patients and (ii) this defect was not compensated for by PGE2 addition. Moreover, altered HIF-1α activation was associated with low levels of proteolysis by PHD-2 in cells from sporadic ALS patients (relative to controls). For the first time, we have demonstrated clinical and functional abnormalities in the HIF-1 pathway during hypoxia in monocytes from sporadic ALS patients.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Moreau C,Gosset P,Kluza J,Brunaud-Danel V,Lassalle P,Marchetti P,Defebvre L,Destée A,Devos D

doi

10.1016/j.neuroscience.2010.10.040

subject

Has Abstract

pub_date

2011-01-13 00:00:00

pages

110-7

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(10)01395-3

journal_volume

172

pub_type

杂志文章

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