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2014 ; 5
(6
): e1308
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Chronic restraint stress decreases the repair potential from mesenchymal stem
cells on liver injury by inhibiting TGF-?1 generation
#MMPMID24967970
Yang X
; Han ZP
; Zhang SS
; Zhu PX
; Hao C
; Fan TT
; Yang Y
; Li L
; Shi YF
; Wei LX
Cell Death Dis
2014[Jun]; 5
(6
): e1308
PMID24967970
show ga
Chronic psychological stress has been demonstrated to play an important role in
several severe diseases, but whether it affects disease therapy or not remains
unclear. Mesenchymal stem cells (MSCs) have been demonstrated to have therapeutic
potentials in treating tissue injury based on their multidifferentiation
potential toward various cell types. We investigated the effect of chronic
restraint stress on therapeutic potential of MSCs on carbon tetrachloride
(CCl4)-induced liver injury in mice. CCl4-induced mice were injected with
enhanced green fluorescent protein-MSCs, which was followed by chronic restraint
stress administration. Corticosterone and RU486, a glucocorticoid receptor (GR)
antagonist, were employed in vivo and in vitro, too. In the present study, we
illustrated that MSCs could repair liver injury by differentiating into
myofibroblasts (MFs) which contribute to fibrosis, whereas stress repressed
differentiation of MSCs into MFs displayed by reducing ?-smooth muscle actin
(?-SMA, a solid marker of MFs) expression. Whereas RU486 could maintain the liver
injury reduction and liver fibrosis increases induced by MSCs in stressed mice
and block the decrease of ?-SMA expression induced by stress. Furthermore,
chronic stress inhibited MFs differentiation from MSCs by inhibiting transforming
growth factor-?1 (TGF-?1)/Smads signaling pathway which is essential for MFs
differentiation. Chronic stress reduced autocrine TGF-?1 of MSCs, but not blunted
activation of Smads. All these data suggested that corticosterone triggered by
chronic stress impaired liver injury repair by MSCs through inhibiting TGF-?1
expression which results in reduced MFs differentiation of MSCs.