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2015 ; 135
(4
): 1016-1024
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RNA-Seq and ChIP-Seq reveal SQSTM1/p62 as a key mediator of JunB suppression of
NF-?B-dependent inflammation
#MMPMID25501661
Zhang X
; Jin JY
; Wu J
; Qin X
; Streilein R
; Hall RP
; Zhang JY
J Invest Dermatol
2015[Apr]; 135
(4
): 1016-1024
PMID25501661
show ga
Mice with epidermal deletion of JunB transcription factor displayed a
psoriasis-like inflammation. The relevance of these findings to humans and the
mechanisms mediating JunB function are not fully understood. Here we demonstrate
that impaired JunB function via gene silencing or overexpression of a dominant
negative mutant increased human keratinocyte cell proliferation but decreased
cell barrier function. RNA-seq revealed over 500 genes affected by JunB loss of
function, which included the upregulation of an array of proinflammatory
molecules relevant to psoriasis. Among these were tumor necrosis factor ? (TNF?),
CCL2, CXCL10, IL6R, and SQSTM1, an adaptor protein involved in nuclear factor
kappa-light-chain-enhancer of activated B cells (NF-?B) activation. Chromatin
immunoprecipitation (ChIP)-Seq and gene reporter analyses showed that JunB
directly suppressed SQSTM1 by binding to a consensus AP-1 cis element located
around 2?kb upstream of SQSTM1-transcription start site. Similar to JunB loss of
function, SQSTM1-overexpression induced TNF?, CCL2, and CXCL10. Conversely, NF-?B
inhibition genetically with a mutant I?B? or pharmacologically with pyrrolidine
dithiocarbamate (PDTC) prevented cytokine, but not IL6R, induction by JunB
deficiency. Taken together, our findings indicate that JunB controls epidermal
growth, barrier formation, and proinflammatory responses through direct and
indirect mechanisms, pinpointing SQSTM1 as a key mediator of JunB suppression of
NF-?B-dependent inflammation.
|Adaptor Proteins, Signal Transducing/*genetics/metabolism
[MESH]