Astrocytic laminin regulates pericyte differentiation and maintains blood brain barrier integrity.

Abstract:

:Blood brain barrier (BBB) breakdown is not only a consequence of but also contributes to many neurological disorders, including stroke and Alzheimer's disease. How the basement membrane (BM) contributes to the normal functioning of the BBB remains elusive. Here we use conditional knockout mice and an acute adenovirus-mediated knockdown model to show that lack of astrocytic laminin, a brain-specific BM component, induces BBB breakdown. Using functional blocking antibody and RNAi, we further demonstrate that astrocytic laminin, by binding to integrin α2 receptor, prevents pericyte differentiation from the BBB-stabilizing resting stage to the BBB-disrupting contractile stage, and thus maintains the integrity of BBB. Additionally, loss of astrocytic laminin decreases aquaporin-4 (AQP4) and tight junction protein expression. Altogether, we report a critical role for astrocytic laminin in BBB regulation and pericyte differentiation. These results indicate that astrocytic laminin maintains the integrity of BBB through, at least in part, regulation of pericyte differentiation.

journal_name

Nat Commun

journal_title

Nature communications

authors

Yao Y,Chen ZL,Norris EH,Strickland S

doi

10.1038/ncomms4413

subject

Has Abstract

pub_date

2014-03-03 00:00:00

pages

3413

issn

2041-1723

pii

ncomms4413

journal_volume

5

pub_type

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