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Vol. 296, Issue 2, 412-419, February 2001
Department of Pharmacology, Osaka University of Pharmaceutical
Sciences, Takatsuki, Osaka, Japan
We investigated the effects of pre- or post-ischemic treatment with
KB-R7943, a new Na+/Ca2+ exchange inhibitor, on
ischemic acute renal failure (ARF) in rats, and these were compared
with the effects of verapamil. Ischemic ARF was induced by clamping the
left renal pedicle for 45-min followed by reperfusion, 2 weeks after
contralateral nephrectomy. Renal function markedly decreased 24 h
after reperfusion. Pre-ischemic treatment with KB-R7943 or verapamil
attenuated the ARF-induced renal dysfunction. The
ischemia/reperfusion-induced renal dysfunction was overcome by
post-ischemic treatment with KB-R7943 but not with verapamil.
Histopathological examination of the kidney of ARF rats revealed severe
renal damage, and suppression of the damage was seen with post-ischemic
treatment with KB-R7943. KB-R7943 markedly suppressed the increment of
endothelin-1 (ET-1) content in the kidney at 2, 6, and 24 h after
reperfusion. No significant changes in Na+/Ca2+
exchanger protein expression in renal tissue were observed with 45-min
ischemia, 6 h after reperfusion and KB-R7943 treatment. These
results suggest that Ca2+ overload via the reverse mode of
Na+/Ca2+ exchange, followed by ET-1
overproduction, seems to play an important role in the pathogenesis of
the ischemia/reperfusion-induced ARF. KB-R7943, which is effective in
both cases of pre- and post-ischemic treatments, may prove to be an
effective therapeutic agent for cases of ischemic ARF.
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