Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 269.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 269.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\26370512
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Mol+Cell+Biol
2015 ; 35
(23
): 3962-73
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
High CO2 Leads to Na,K-ATPase Endocytosis via c-Jun Amino-Terminal Kinase-Induced
LMO7b Phosphorylation
#MMPMID26370512
Dada LA
; Trejo Bittar HE
; Welch LC
; Vagin O
; Deiss-Yehiely N
; Kelly AM
; Baker MR
; Capri J
; Cohn W
; Whitelegge JP
; Vadász I
; Gruenbaum Y
; Sznajder JI
Mol Cell Biol
2015[Dec]; 35
(23
): 3962-73
PMID26370512
show ga
The c-Jun amino-terminal kinase (JNK) plays a role in inflammation,
proliferation, apoptosis, and cell adhesion and cell migration by phosphorylating
paxillin and ?-catenin. JNK phosphorylation downstream of AMP-activated protein
kinase (AMPK) activation is required for high CO2 (hypercapnia)-induced
Na,K-ATPase endocytosis in alveolar epithelial cells. Here, we provide evidence
that during hypercapnia, JNK promotes the phosphorylation of LMO7b, a scaffolding
protein, in vitro and in intact cells. LMO7b phosphorylation was blocked by
exposing the cells to the JNK inhibitor SP600125 and by infecting cells with
dominant-negative JNK or AMPK adenovirus. The knockdown of the endogenous LMO7b
or overexpression of mutated LMO7b with alanine substitutions of five potential
JNK phosphorylation sites (LMO7b-5SA) or only Ser-1295 rescued both LMO7b
phosphorylation and the hypercapnia-induced Na,K-ATPase endocytosis. Moreover,
high CO2 promoted the colocalization and interaction of LMO7b and the Na,K-ATPase
?1 subunit at the plasma membrane, which were prevented by SP600125 or by
transfecting cells with LMO7b-5SA. Collectively, our data suggest that
hypercapnia leads to JNK-induced LMO7b phosphorylation at Ser-1295, which
facilitates the interaction of LMO7b with Na,K-ATPase at the plasma membrane
promoting the endocytosis of Na,K-ATPase in alveolar epithelial cells.