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2018 ; 8
(1
): 6277
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Acute Hyperthermia Inhibits TGF-?1-induced Cardiac Fibroblast Activation via
Suppression of Akt Signaling
#MMPMID29674727
Narikawa M
; Umemura M
; Tanaka R
; Fujita T
; Yokoyama U
; Ishigami T
; Kimura K
; Tamura K
; Ishikawa Y
Sci Rep
2018[Apr]; 8
(1
): 6277
PMID29674727
show ga
Transforming growth factor-?1 (TGF-?1) induces phenotypic changes in fibroblasts
to become myofibroblasts with increased production of extracellular matrix (ECM)
components and cytokines. It is also known that excessive activation of
myofibroblasts accelerates cardiac fibrosis, remodeling, and thus cardiac
dysfunction. However, no effective therapy has been established to prevent this
process although recent clinical studies have demonstrated the effectiveness of
hyperthermia in cardiac dysfunction. The aim of this study was to examine the
molecular mechanism of hyperthermia on TGF-?1-mediated phenotypic changes in
cardiac fibroblasts. TGF-?1 increased the expression of IL-6, ?-smooth muscle
actin (?-SMA), and collagen in human cardiac fibroblasts (HCFs). Hyperthermia
(42?°C) significantly prevented these changes, i.e., increases in IL-6, ?-SMA,
and collagen, as induced by TGF-?1 in a time-dependent manner. Immunoblotting
showed that hyperthermia decreased Akt/S6K signaling, but did not affect Smad2
and Smad3 signaling. Pharmacological inhibition of Akt signaling mimicked these
effects of hyperthermia. Furthermore, hyperthermia treatment prevented cardiac
fibrosis in Ang II infusion mice model. Putting together, our findings suggest
that hyperthermia directly inhibits TGF-?-mediated activation of HCFs via
suppressing Akt/S6K signaling.