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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2016 ; 7
(ä): 13546
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PPFIA1 drives active ?5?1 integrin recycling and controls fibronectin
fibrillogenesis and vascular morphogenesis
#MMPMID27876801
Mana G
; Clapero F
; Panieri E
; Panero V
; Böttcher RT
; Tseng HY
; Saltarin F
; Astanina E
; Wolanska KI
; Morgan MR
; Humphries MJ
; Santoro MM
; Serini G
; Valdembri D
Nat Commun
2016[Nov]; 7
(ä): 13546
PMID27876801
show ga
Basolateral polymerization of cellular fibronectin (FN) into a meshwork drives
endothelial cell (EC) polarity and vascular remodelling. However, mechanisms
coordinating ?5?1 integrin-mediated extracellular FN endocytosis and exocytosis
of newly synthesized FN remain elusive. Here we show that, on Rab21-elicited
internalization, FN-bound/active ?5?1 is recycled to the EC surface. We identify
a pathway, comprising the regulators of post-Golgi carrier formation PI4KB and
AP-1A, the small GTPase Rab11B, the surface tyrosine phosphatase receptor PTPRF
and its adaptor PPFIA1, which we propose acts as a funnel combining FN secretion
and recycling of active ?5?1 integrin from the trans-Golgi network (TGN) to the
EC surface, thus allowing FN fibrillogenesis. In this framework, PPFIA1 interacts
with active ?5?1 integrin and localizes close to EC adhesions where post-Golgi
carriers are targeted. We show that PPFIA1 is required for FN
polymerization-dependent vascular morphogenesis, both in vitro and in the
developing zebrafish embryo.
|Adaptor Proteins, Signal Transducing/genetics/*metabolism
[MESH]