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2018 ; 15
(9
): 875-882
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Morphine Induces Fibroblast Activation through Up-regulation of Connexin 43
Expression: Implication of Fibrosis in Wound Healing
#MMPMID30008599
Wu PC
; Hsu WL
; Chen CL
; Lam CF
; Huang YB
; Huang CC
; Lin MH
; Lin MW
Int J Med Sci
2018[]; 15
(9
): 875-882
PMID30008599
show ga
Morphine is the most effective drugs for attenuating various types of severe
pain, but morphine abuse carries a high risk of systemic fibrosis. Our previous
have indicated that systemic administration of morphine hinders angiogenesis and
delays wound healing. Here we have explained the pathological mechanism
underlying the effect of morphine on wound healing. To determine how morphine
affects wound healing, we first created a wound in mice treated them with a
combination of a low doses (5 mg/kg/day) and high doses (20 or 30 mg/kg/day) of
morphine. An In vivo study revealed that high-dose morphine-induced abnormal
myofibroblasts persist after the end of wound healing because of connexin 43
(Cx43) upregulation. High-dose morphine-induced Cx43 increased the expression
levels of focal adhesion molecules, namely fibronectin and alpha-smooth muscle
actin (?-SMA) through the activation of transforming growth factor (TGF)-?1
signaling. In addition, we found that Cx43 contributed to TGF-?RII/ Smad2/3
signaling for regulating the differentiation of fibroblasts into myofibroblasts
during high-dose morphine exposure. In conclusion, the abnormal regulation of
Cx43 by morphine may induce systemic fibrosis because of abnormal myofibroblast
function.