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2017 ; 7
(1
): 365
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Plasminogen Activator Inhibitor-1 Protects Mice Against Cardiac Fibrosis by
Inhibiting Urokinase-type Plasminogen Activator-mediated Plasminogen Activation
#MMPMID28336948
Gupta KK
; Donahue DL
; Sandoval-Cooper MJ
; Castellino FJ
; Ploplis VA
Sci Rep
2017[Mar]; 7
(1
): 365
PMID28336948
show ga
Plasminogen activator inhibitor-1 (PAI-1) is known to protect mice against
cardiac fibrosis. It has been speculated that PAI-1 may regulate cardiac fibrosis
by inactivating urokinase-type plasminogen activator (uPA) and ultimately plasmin
(Pm) generation. However, the in vivo role of PAI-1 in inactivating uPA and
limiting the generation of Pm during cardiac fibrosis remains to be established.
The objective of this study was to determine if the cardioprotective effect of
PAI-1 is mediated through its ability to directly regulate urokinase -mediated
activation of plasminogen (Pg). An Angiotensin II (AngII)-aldosterone (Ald)
infusion mouse model of hypertension was utilised in this study. Four weeks after
AngII-Ald infusion, PAI-1-deficient (PAI-1(-/-)) mice developed severe cardiac
fibrosis. However, a marked reduction in cardiac fibrosis was observed in
PAI-1(-/-)/uPA(-/-) double knockout mice that was associated with reduced
inflammation, lower expression levels of TGF-? and proteases associated with
tissue remodeling, and diminished Smad2 signaling. Moreover, total ablation of
cardiac fibrosis was observed in PAI-1(-/-) mice that express inactive plasmin
(Pm) but normal levels of zymogen Pg (PAI-1(-/-)/Pg(S743A/S743A)). Our findings
indicate that PAI-1 protects mice from hypertension-induced cardiac fibrosis by
inhibiting the generation of active Pm.