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2017 ; 8
(54
): 92914-92925
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MicroRNA-21 inhibits mitochondria-mediated apoptosis in keloid
#MMPMID29190966
Wu H
; Wang J
; Ma H
; Xiao Z
; Dong X
Oncotarget
2017[Nov]; 8
(54
): 92914-92925
PMID29190966
show ga
MicroRNA-21 acts as an oncogene by promoting cell proliferation and migration,
whereas inhibiting apoptosis in majority of cancers. MicroRNA-21 is upregulated
in human keloid fibroblasts. We hypothesized that microRNA-21 may contribute to
pathogenesis of keloid fibroblasts. First, enhanced miR-21 but reduced
mitochondrial-mediated apoptosis observed in keloid tissues indicated its
importance in keloids development. Second, upregulation of microRNA-21 induced a
decrease in the ratio of BAX to BCL-2 and suppressed mitochondrial fission in
keloid fibroblasts. Third, by attenuating the decline in cellular mitochondrial
membrane potential, overexpression of miR-21 suppressed cytochrome c release to
the cytoplasm, followed by a decrease in the activity of intracellular caspase-9
and caspase-3, suggesting that mitochondrial-mediated proapoptotic pathway was
impaired. Simultaneously, intracellular reactive oxygen species were decreased,
indicating microRNA-21 undermined oxidative stress. This phenotype was reversed
by miR-21 inhibition. Therefore, our study demonstrates that inhibition of
microRNA-21 induces mitochondrial-mediated apoptosis in keloid fibroblasts,
proposing microRNA-21 as a potential therapeutic target in keloid fibroblasts.