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Sci Transl Med. 2012 Nov 21;4(161):161ra150. doi: 10.1126/scitranslmed.3004660.

Mesenchymal stem cells regulate blood-brain barrier integrity through TIMP3 release after traumatic brain injury.

Author information

1
Blood Systems Research Institute, San Francisco, CA 94118, USA.

Abstract

Mesenchymal stem cells (MSCs) may be useful for treating a variety of disease states associated with vascular instability including traumatic brain injury (TBI). A soluble factor, tissue inhibitor of matrix metalloproteinase-3 (TIMP3), produced by MSCs is shown to recapitulate the beneficial effects of MSCs on endothelial function and to ameliorate the effects of a compromised blood-brain barrier (BBB) due to TBI. Intravenous administration of recombinant TIMP3 inhibited BBB permeability caused by TBI, whereas attenuation of TIMP3 expression in intravenously administered MSCs blocked the beneficial effects of the MSCs on BBB permeability and stability. MSCs increased circulating concentrations of soluble TIMP3, which blocked vascular endothelial growth factor-A-induced breakdown of endothelial cell adherens junctions in vitro and in vivo. These findings elucidate a potential molecular mechanism for the beneficial effects of MSCs on the BBB after TBI and demonstrate a role for TIMP3 in the regulation of BBB integrity.

PMID:
23175708
PMCID:
PMC3890105
DOI:
10.1126/scitranslmed.3004660
[Indexed for MEDLINE]
Free PMC Article

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