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2015 ; 35
(5
): 778-88
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Stabilization of ATF5 by TAK1-Nemo-like kinase critically regulates the
interleukin-1?-stimulated C/EBP signaling pathway
#MMPMID25512613
Zhang ZY
; Li SZ
; Zhang HH
; Wu QR
; Gong J
; Liang T
; Gao L
; Xing NN
; Liu WB
; Du RL
; Zhang XD
Mol Cell Biol
2015[Mar]; 35
(5
): 778-88
PMID25512613
show ga
Interleukin-1? (IL-1?) is a key proinflammatory cytokine that initiates several
signaling cascades, including those involving CCAAT/enhancer binding proteins
(C/EBPs). The mechanism by which IL-1? propagates a signal that activates C/EBP
has remained elusive. Nemo-like kinase (NLK) is a mitogen-activated protein
kinase (MAPK)-like kinase associated with many pathways and phenotypes that are
not yet well understood. Using a luciferase reporter screen, we found that
IL-1?-induced C/EBP activation was positively regulated by NLK. Overexpression of
NLK activated C/EBP and potentiated IL-1?-triggered C/EBP activation, whereas
knockdown or knockout of NLK had the opposite effect. NLK interacted with
activating transcription factor 5 (ATF5) and inhibited the proteasome-dependent
degradation of ATF5 in a kinase-independent manner. Consistently, NLK deficiency
resulted in decreased levels of ATF5. NLK cooperated with ATF5 to activate C/EBP,
whereas NLK could not activate C/EBP upon knockdown of ATF5. Moreover, TAK1, a
downstream effector of IL-1? that acts upstream of NLK, mimicked the ability of
NLK to stabilize ATF5 and activate C/EBP. Thus, our findings reveal the TAK1-NLK
pathway as a novel regulator of basal or IL-1?-triggered C/EBP activation though
stabilization of ATF5.