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2017 ; 18
(9
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Hepatocyte Growth Factor Mediates Enhanced Wound Healing Responses and Resistance
to Transforming Growth Factor-??-Driven Myofibroblast Differentiation in Oral
Mucosal Fibroblasts
#MMPMID28837064
Dally J
; Khan JS
; Voisey A
; Charalambous C
; John HL
; Woods EL
; Steadman R
; Moseley R
; Midgley AC
Int J Mol Sci
2017[Aug]; 18
(9
): ä PMID28837064
show ga
Oral mucosal wounds are characterized by rapid healing with minimal scarring,
partly attributable to the "enhanced" wound healing properties of oral mucosal
fibroblasts (OMFs). Hepatocyte growth factor (HGF) is a pleiotropic growth
factor, with potential key roles in accelerating healing and preventing fibrosis.
HGF can exist as full-length or truncated (HGF-NK), NK1 and NK2 isoforms. As OMFs
display elevated HGF expression compared to dermal fibroblasts (DFs), this study
investigated the extent to which HGF mediates the preferential cellular functions
of OMFs, and the influence of pro-fibrotic, transforming growth factor-??
(TGF-??) on these responses. Knockdown of HGF expression in OMFs by
short-interfering RNA (siHGF) significantly inhibited OMF proliferative and
migratory responses. Supplementation with exogenous TGF-?? also significantly
inhibited proliferation and migration, concomitant with significantly
down-regulated HGF expression. In addition, knockdown abrogated OMF resistance to
TGF-??-driven myofibroblast differentiation, as evidenced by increased ?-smooth
muscle actin (?-SMA) expression, F-actin reorganisation, and stress fibre
formation. Responses were unaffected in siHGF-transfected DFs. OMFs expressed
significantly higher full-length HGF and NK1 levels compared to patient-matched
DFs, whilst NK2 expression was similar in both OMFs and DFs. Furthermore, NK2 was
preferentially expressed over NK1 in DFs. TGF-?? supplementation significantly
down-regulated full-length HGF and NK1 expression by OMFs, while NK2 was less
affected. This study demonstrates the importance of HGF in mediating "enhanced"
OMF cellular function. We also propose that full-length HGF and HGF-NK1 convey
desirable wound healing properties, whilst fibroblasts preferentially expressing
more HGF-NK2 readily undergo TGF-??-driven differentiation into myofibroblasts.