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2015 ; 35
(9
): 1573-87
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Requisite role for Nck adaptors in cardiovascular development,
endothelial-to-mesenchymal transition, and directed cell migration
#MMPMID25691664
Clouthier DL
; Harris CN
; Harris RA
; Martin CE
; Puri MC
; Jones N
Mol Cell Biol
2015[May]; 35
(9
): 1573-87
PMID25691664
show ga
Development of the cardiovascular system is critically dependent on the ability
of endothelial cells (ECs) to reorganize their intracellular actin architecture
to facilitate migration, adhesion, and morphogenesis. Nck family cytoskeletal
adaptors function as key mediators of actin dynamics in numerous cell types,
though their role in EC biology remains largely unexplored. Here, we demonstrate
an essential requirement for Nck within ECs. Mouse embryos lacking endothelial
Nck1/2 expression develop extensive angiogenic defects that result in lethality
at about embryonic day 10. Mutant embryos show immature vascular networks, with
decreased vessel branching, aberrant perivascular cell recruitment, and reduced
cardiac trabeculation. Strikingly, embryos deficient in endothelial Nck also fail
to undergo the endothelial-to-mesenchymal transition (EnMT) required for cardiac
valve morphogenesis, with loss of Nck disrupting expression of major EnMT
markers, as well as suppressing mesenchymal outgrowth. Furthermore, we show that
Nck-null ECs are unable to migrate downstream of vascular endothelial growth
factor and angiopoietin-1, and they exhibit profound perturbations in
cytoskeletal patterning, with disorganized cellular projections, impaired focal
adhesion turnover, and disrupted actin-based signaling. Our collective findings
thereby reveal a crucial role for Nck as a master regulator within the
endothelium to control actin cytoskeleton organization, vascular network
remodeling, and EnMT during cardiovascular development.
|*Epithelial-Mesenchymal Transition
[MESH]
|Adaptor Proteins, Signal Transducing/*genetics/metabolism
[MESH]