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Role of the MEOX2 homeobox gene in neurovascular dysfunction in Alzheimer disease.

Abstract：

:Neurovascular dysfunction substantially contributes to Alzheimer disease. Here, we show that transcriptional profiling of human brain endothelial cells (BECs) defines a subset of genes whose expression is age-independent but is considerably altered in Alzheimer disease, including the homeobox gene MEOX2 (also known as GAX), a regulator of vascular differentiation, whose expression is low in Alzheimer disease. By using viral-mediated MEOX2 gene silencing and transfer, we show that restoring expression of the protein it encodes, GAX, in BECs from individuals with Alzheimer disease stimulates angiogenesis, transcriptionally suppresses AFX1 forkhead transcription factor-mediated apoptosis and increases the levels of a major amyloid-beta peptide (Abeta) clearance receptor, the low-density lipoprotein receptor-related protein 1 (LRP), at the blood-brain barrier. In mice, deletion of Meox2 (also known as Gax) results in reductions in brain capillary density and resting cerebral blood flow, loss of the angiogenic response to hypoxia in the brain and an impaired Abeta efflux from brain caused by reduced LRP levels. The link of MEOX2 to neurovascular dysfunction in Alzheimer disease provides new mechanistic and therapeutic insights into this illness.

journal_name

Nat Med

journal_title

Nature medicine

authors

Wu Z,Guo H,Chow N,Sallstrom J,Bell RD,Deane R,Brooks AI,Kanagala S,Rubio A,Sagare A,Liu D,Li F,Armstrong D,Gasiewicz T,Zidovetzki R,Song X,Hofman F,Zlokovic BV

doi

10.1038/nm1287

keywords:

subject

Has Abstract

pub_date

2005-09-01 00:00:00

pages

959-65

issue

9

eissn

1078-8956

issn

1546-170X

pii

nm1287

journal_volume

11

pub_type

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