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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
2016 ; 291
(26
): 13789-801
Nephropedia Template TP
gab.com Text
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English Wikipedia
Tumor Necrosis Factor-stimulated Gene 6 (TSG-6)-mediated Interactions with the
Inter-?-inhibitor Heavy Chain 5 Facilitate Tumor Growth Factor ?1
(TGF?1)-dependent Fibroblast to Myofibroblast Differentiation
#MMPMID27143355
Martin J
; Midgley A
; Meran S
; Woods E
; Bowen T
; Phillips AO
; Steadman R
J Biol Chem
2016[Jun]; 291
(26
): 13789-801
PMID27143355
show ga
Fibroblasts are central to wound healing and fibrosis through TGF?1-triggered
differentiation into contractile, ?-smooth muscle actin (?-SMA)-positive
myofibroblasts. This is mediated by accumulation of a pericellular matrix of
hyaluronan (HA) and the HA-dependent co-localization of CD44 with the epidermal
growth factor receptor (EGFR). Interactions of HA with hyaladherins, such as
inter-?-inhibitor (I?I) and tumor necrosis factor-stimulated gene-6 (TSG-6), are
also essential for differentiation. This study investigated the mechanisms
involved. TSG-6 and ?-SMA had different kinetics of induction by TGF?1, with
TSG-6 peaking before ?-SMA Si CD44 or EGFR inhibition prevented differentiation
but had no effect on TSG-6 expression. TSG-6 was essential for differentiation,
and mAb A38 (preventing I?I heavy chain (HC) transfer), HA-oligosaccharides,
cobalt, or Si bikunin prevented TSG-6 activity, preventing differentiation. A38
also prevented the EGFR/CD44 association. This suggested that TSG-6/I?I HC
interaction was necessary for the effect of TSG-6 and that HC stabilization of HA
initiated the CD44/EGFR association. The newly described HC5 was shown to be the
principal HC expressed, and its cell surface expression was prevented by siRNA
inhibition of TSG-6 or bikunin. HC5 was released by hyaluronidase treatment,
confirming its association with cell surface HA. Finally, HC5 knockdown by siRNA
confirmed its role in myofibroblast differentiation. The current study describes
a novel mechanism linking the TSG-6 transfer of the newly described HC5 to the
HA-dependent control of cell phenotype. The interaction of HC5 with cell surface
HA was essential for TGF?1-dependent differentiation of fibroblasts to
myofibroblasts, highlighting its importance as a novel potential therapeutic
target.