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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
2017 ; 8
(ä): 15502
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The ubiquitin ligase ZNRF1 promotes caveolin-1 ubiquitination and degradation to
modulate inflammation
#MMPMID28593998
Lee CY
; Lai TY
; Tsai MK
; Chang YC
; Ho YH
; Yu IS
; Yeh TW
; Chou CC
; Lin YS
; Lawrence T
; Hsu LC
Nat Commun
2017[Jun]; 8
(ä): 15502
PMID28593998
show ga
Caveolin-1 (CAV1), the major constituent of caveolae, plays a pivotal role in
various cellular biological functions, including cancer and inflammation. The
ubiquitin/proteasomal pathway is known to contribute to the regulation of CAV1
expression, but the ubiquitin ligase responsible for CAV1 protein stability
remains unidentified. Here we reveal that E3 ubiquitin ligase ZNRF1 modulates
CAV1 protein stability to regulate Toll-like receptor (TLR) 4-triggered immune
responses. We demonstrate that ZNRF1 physically interacts with CAV1 in response
to lipopolysaccharide and mediates ubiquitination and degradation of CAV1. The
ZNRF1-CAV1 axis regulates Akt-GSK3? activity upon TLR4 activation, resulting in
enhanced production of pro-inflammatory cytokines and inhibition of
anti-inflammatory cytokine IL-10. Mice with deletion of ZNRF1 in their
hematopoietic cells display increased resistance to endotoxic and polymicrobial
septic shock due to attenuated inflammation. Our study defines ZNRF1 as a
regulator of TLR4-induced inflammatory responses and reveals another mechanism
for the regulation of TLR4 signalling through CAV1.