Modulation of vascular gene expression by hypoxia.

Abstract:

PURPOSE OF REVIEW:Angiogenesis and inflammation are important features in atherosclerotic plaque destabilization. The transcription factors hypoxia-inducible factor-1alpha and Notch are key regulators of angiogenesis. In addition, hypoxia-inducible factor-1alpha has been linked to regulation of inflammatory processes and innate immunity. This review will document how hypoxia-inducible factor-mediated signaling pathways are initiated in hypoxic cells, and how the hypoxia-inducible factor and Notch-dependent signaling pathways are functionally integrated. RECENT FINDINGS:Activation of the hypoxia-inducible factor-mediated signaling events by hypoxia is complex and regulated by a cascade of molecular events that will be reviewed in detail. The activated form of hypoxia-inducible factor enhances Notch-dependent activation of Notch target genes, thereby providing a mechanism by which hypoxia can regulate the differentiation status of a cell. Recent observations implicate the Notch signaling pathway in proper specification of cell identity, position and behavior in a developing blood vessel sprout, and the hypoxia-inducible factor-mediated signaling pathway is critical for induction of expression of vascular endothelial growth factor. SUMMARY:Hypoxia-inducible factor and Notch transcription factors represent potentially attractive targets for regulation of angiogenesis and possibly inflammation. In view of the pleiotropic effects of these transcription factors, however, successful targeting of these signaling pathways will require the development of gene specific (and possibly tissue-specific) modulators and extensive validation in relevant model systems.

journal_name

Curr Opin Lipidol

authors

Ruas JL,Lendahl U,Poellinger L

doi

10.1097/MOL.0b013e3282efe49d

subject

Has Abstract

pub_date

2007-10-01 00:00:00

pages

508-14

issue

5

eissn

0957-9672

issn

1473-6535

pii

00041433-200710000-00005

journal_volume

18

pub_type

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