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2016 ; 11
(5
): e0155486
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gab.com Text
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English Wikipedia
TGF-? Small Molecule Inhibitor SB431542 Reduces Rotator Cuff Muscle Fibrosis and
Fatty Infiltration By Promoting Fibro/Adipogenic Progenitor Apoptosis
#MMPMID27186977
Davies MR
; Liu X
; Lee L
; Laron D
; Ning AY
; Kim HT
; Feeley BT
PLoS One
2016[]; 11
(5
): e0155486
PMID27186977
show ga
Rotator cuff tears represent a large burden of muscle-tendon injuries in our
aging population. While small tears can be repaired surgically with good
outcomes, critical size tears are marked by muscle atrophy, fibrosis, and fatty
infiltration, which can lead to failed repair, frequent re-injury, and chronic
disability. Previous animal studies have indicated that Transforming Growth
Factor-? (TGF-?) signaling may play an important role in the development of these
muscle pathologies after injury. Here, we demonstrated that inhibition of TGF-?1
signaling with the small molecule inhibitor SB431542 in a mouse model of massive
rotator cuff tear results in decreased fibrosis, fatty infiltration, and muscle
weight loss. These observed phenotypic changes were accompanied by decreased
fibrotic, adipogenic, and atrophy-related gene expression in the injured muscle
of mice treated with SB431542. We further demonstrated that treatment with
SB431542 reduces the number of fibro/adipogenic progenitor (FAP) cells-an
important cellular origin of rotator cuff muscle fibrosis and fatty infiltration,
in injured muscle by promoting apoptosis of FAPs. Together, these data indicate
that the TGF-? pathway is a critical regulator of the degenerative muscle changes
seen after massive rotator cuff tears. TGF-? promotes rotator cuff muscle
fibrosis and fatty infiltration by preventing FAP apoptosis. TGF-? regulated FAP
apoptosis may serve as an important target pathway in the future development of
novel therapeutics to improve muscle outcomes following rotator cuff tear.