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2017 ; 7
(1
): 4946
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Physical Binding of Endothelial MCAM and Neural Transmembrane Protease
Matriptase-Novel Cell Adhesion in Neural Stem cell Vascular Niche
#MMPMID28694515
Tung HH
; Lee SL
Sci Rep
2017[Jul]; 7
(1
): 4946
PMID28694515
show ga
Brain neural stem cells and transit amplifying cells in the subventricular zone
(SVZ) of the lateral ventricles are in direct contact with the microvascular
endothelium. The mechanisms/molecules of direct cell contact in the SVZ
neurovascular niche are not fully understood. We previously showed that neural
stem/progenitor (NS/P) cells induce brain endothelial signaling in direct cell
contact through matriptase (MTP) on NS/P cell surface. In the present study,
using pull-down and LC-MS/MS, we identified melanoma cell adhesion molecule
(MCAM) the brain endothelial molecule that interacts with MTP. MCAM physically
binds to the CUB domains of MTP and induces a chain of brain endothelial
signaling including p38MAPK activation, GSK3? inactivation and subsequently
?-catenin activation; none of these signaling events occurred when either MTP or
MCAM is deleted. MTP-MCAM binding and induction of endothelial signaling were all
sensitive to cholera toxin. Together, we identified key molecules that may
represent a mechanism in neural stem cell vascular niche regulation.