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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cell+Mol+Med
2017 ; 21
(9
): 1791-1802
Nephropedia Template TP
Zhang X
; Gao S
; Tanaka M
; Zhang Z
; Huang Y
; Mitsui T
; Kamiyama M
; Koizumi S
; Fan J
; Takeda M
; Yao J
J Cell Mol Med
2017[Sep]; 21
(9
): 1791-1802
PMID28244642
show ga
Carbenoxolone (CBX) is a clinically prescribed drug for the treatment of
digestive ulcer and inflammation. It is also a widely used pharmacological
inhibitor of several channels in basic research. Given that the overactivity of
several channels, including those inhibitable by CBX, underlies bladder
dysfunction, we tested the potential therapeutic application and mechanism of CBX
in the treatment of voiding dysfunction. In a mouse model of cystitis induced by
cyclophosphamide (CYP), CBX administration prevented the CYP-elicited increase in
bladder weight, oedema, haemorrhage, and urothelial injury. CBX also greatly
improved micturition pattern, as manifested by the apparently decreased
micturition frequency and increased micturition volume. Western blot results
showed that CBX suppressed CYP-induced increase in protein carbonyls, COX-2, and
iNOS. Further analysis using cultured urothelial cells revealed that acrolein,
the major metabolite of CYP, caused protein oxidation, p38 activation, and
urothelial injury. These effects of acrolein were reproduced by TRPV4 agonists
and significantly prevented by antioxidant NAC, p38 inhibitor SB203580, TRPV4
antagonist RN-1734, and CBX. Further studies showed that CBX potently suppressed
TRPV4 agonist-initiated calcium influx and subsequent cell injury. CBX attenuated
CYP-induced cystitis in vivo and reduced acrolein-induced cell injury in vitro,
through mechanisms involving inhibition of TRPV4 channels and attenuation of the
channel-mediated oxidative stress. CBX might be a promising agent for the
treatment of bladder dysfunction.