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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 J+Biol+Chem
2015 ; 290
(18
): 11704-14
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Carboxyl terminus of HSC70-interacting protein (CHIP) down-regulates
NF-?B-inducing kinase (NIK) and suppresses NIK-induced liver injury
#MMPMID25792747
Jiang B
; Shen H
; Chen Z
; Yin L
; Zan L
; Rui L
J Biol Chem
2015[May]; 290
(18
): 11704-14
PMID25792747
show ga
Ser/Thr kinase NIK (NF-?B-inducing kinase) mediates the activation of the
noncanonical NF-?B2 pathway, and it plays an important role in regulating immune
cell development and liver homeostasis. NIK levels are extremely low in quiescent
cells due to ubiquitin/proteasome-mediated degradation, and cytokines stimulate
NIK activation through increasing NIK stability; however, regulation of NIK
stability is not fully understood. Here we identified CHIP (carboxyl terminus of
HSC70-interacting protein) as a new negative regulator of NIK. CHIP contains
three N-terminal tetratricopeptide repeats (TPRs), a middle dimerization domain,
and a C-terminal U-box. The U-box domain contains ubiquitin E3 ligase activity
that promotes ubiquitination of CHIP-bound partners. We observed that CHIP bound
to NIK via its TPR domain. In both HEK293 and primary hepatocytes, overexpression
of CHIP markedly decreased NIK levels at least in part through increasing
ubiquitination and degradation of NIK. Accordingly, CHIP suppressed NIK-induced
activation of the noncanonical NF-?B2 pathway. CHIP also bound to TRAF3, and CHIP
and TRAF3 acted coordinately to efficiently promote NIK degradation. The TPR but
not the U-box domain was required for CHIP to promote NIK degradation. In mice,
hepatocyte-specific overexpression of NIK resulted in liver inflammation and
injury, leading to death, and liver-specific expression of CHIP reversed the
detrimental effects of hepatic NIK. Our data suggest that CHIP/TRAF3/NIK
interactions recruit NIK to E3 ligase complexes for ubiquitination and
degradation, thus maintaining NIK at low levels. Defects in CHIP regulation of
NIK may result in aberrant NIK activation in the liver, contributing to live
injury, inflammation, and disease.