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2017 ; 8
(2
): e2606
Nephropedia Template TP
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Coordinate activities of BRD4 and CDK9 in the transcriptional elongation complex
are required for TGF?-induced Nox4 expression and myofibroblast
transdifferentiation
#MMPMID28182006
Ijaz T
; Jamaluddin M
; Zhao Y
; Zhang Y
; Jay J
; Finnerty CC
; Herndon DN
; Tilton RG
; Brasier AR
Cell Death Dis
2017[Feb]; 8
(2
): e2606
PMID28182006
show ga
Transdifferentiation of quiescent dermal fibroblasts to secretory myofibroblasts
has a central role in wound healing and pathological scar formation. This
myofibroblast transdifferentiation process involves TGF?-induced de novo
synthesis of alpha smooth muscle cell actin (?SMA)+ fibers that enhance
contractility as well as increased expression of extracellular matrix (ECM)
proteins, including collagen and fibronectin. These processes are mediated
upstream by the reactive oxygen species (ROS)-producing enzyme Nox4, whose
induction by TGF? is incompletely understood. In this study, we demonstrate that
Nox4 is involved in ?SMA+ fiber formation and collagen production in primary
human dermal fibroblasts (hDFs) using a small-molecule inhibitor and
siRNA-mediated silencing. Furthermore, TGF?-induced signaling via Smad3 is
required for myofibroblast transformation and Nox4 upregulation.
Immunoprecipitation-selected reaction monitoring (IP-SRM) assays of the activated
Smad3 complex suggest that it couples with the epigenetic reader and
transcription co-activator bromodomain and extraterminal (BET) domain containing
protein 4 (BRD4) to promote Nox4 transcription. In addition, cyclin-dependent
kinase 9 (CDK9), a component of positive transcription elongation factor, binds
to BRD4 after TGF? stimulation and is also required for RNA polymerase II
phosphorylation and Nox4 transcription regulation. Surprisingly, BRD4 depletion
decreases myofibroblast differentiation but does not affect collagen or
fibronectin expression in primary skin fibroblasts, whereas knockdown of CDK9
decreases all myofibroblast genes. We observe enhanced numbers and persistence of
myofibroblast formation and TGF? signaling in hypertrophic scars. BRD4 inhibition
reverses hypertrophic skin fibroblast transdifferentiation to myofibroblasts. Our
data indicate that BRD4 and CDK9 have independent, coordinated roles in promoting
the myofibroblast transition and suggest that inhibition of the Smad3-BRD4
pathway may be a useful strategy to limit hypertrophic scar formation after burn
injury.