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2014 ; 31
(3
): 319-331
Nephropedia Template TP
gab.com Text
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English Wikipedia
B-LINK: a hemicentin, plakin, and integrin-dependent adhesion system that links
tissues by connecting adjacent basement membranes
#MMPMID25443298
Morrissey MA
; Keeley DP
; Hagedorn EJ
; McClatchey STH
; Chi Q
; Hall DH
; Sherwood DR
Dev Cell
2014[Nov]; 31
(3
): 319-331
PMID25443298
show ga
Basement membrane (BM), a sheet-like form of extracellular matrix, surrounds most
tissues. During organogenesis, specific adhesions between adjoining tissues
frequently occur; however, their molecular basis is unclear. Using live-cell
imaging and electron microscopy, we identify an adhesion system that connects the
uterine and gonadal tissues through their juxtaposed BMs at the site of anchor
cell (AC) invasion in C. elegans. We find that the extracellular matrix component
hemicentin (HIM-4), found between BMs, forms punctate accumulations under the AC
and controls BM linkage to promote rapid invasion. Through targeted screening, we
identify the integrin-binding cytolinker plakin (VAB-10A) and integrin
(INA-1/PAT-3) as key BM-BM linkage regulators: VAB-10A localizes to the AC-BM
interface and tethers hemicentin to the AC while integrin promotes hemicentin
punctae formation. Together, plakin, integrin, and hemicentin are founding
components of a cell-directed adhesion system, which we name a BM-LINKage
(B-LINK), that connects adjacent tissues through adjoining BMs.