L-cis diltiazem attenuates intracellular Ca(2+) overload by metabolic inhibition in guinea pig myocytes.

Abstract:

:We have previously demonstrated that treatment with L-cis diltiazem reduced cardiac infarct size in vivo. To examine the effect of L-cis diltiazem on Ca(2+) overload induced by ischemia/reperfusion, we used a model for Ca(2+) overload produced by metabolic inhibition in isolated guinea pig myocytes. Intracellular Ca(2+) concentration ([Ca(2+)](i)) was quantified by fura-2 fluorescence microscopy and Ca(2+) overload was induced by inclusion of 1 microM of carbonyl cyanide m-chrolophenylhydrazone (CCCP) for 40 min treatment followed by washout for 30 min. This treatment caused a large [Ca(2+)](i) elevation as well as a sustained contracture of the cardiomyocytes. The increase was suppressed by 10 microM of 2-[2-[4-(4-nitrobenzyloxy) phenyl] ethyl] isothiourea methanesulphonate (KB-R7943), a specific inhibitor of the Na(+)/Ca(2+) exchanger, but not by nitrendipine (10 microM). L-cis Diltiazem (10 microM) attenuated the [Ca(2+)](i) increase, suggesting that L-cis diltiazem elicits a cardioprotective effect via attenuation of the [Ca(2+)](i) increase induced by metabolic inhibition and energy repletion.

journal_name

Eur J Pharmacol

authors

Nishida M,Urushidani T,Sakamoto K,Nagao T

doi

10.1016/s0014-2999(99)00709-8

keywords:

subject

Has Abstract

pub_date

1999-12-03 00:00:00

pages

225-30

issue

2-3

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(99)00709-8

journal_volume

385

pub_type

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