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Reduction of myocardial infarct size by SM-198110, a novel Na+/H+ exchange inhibitor, in rabbits

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Abstract

The effects of 3-[2-({[amino(imino)methyl]amino}carbonyl)-4-chloro-1H-indol-1-yl]-1-propanesulphonic acid monohydrate (SM-198110), a novel potent Na+/H+ exchange inhibitor, and cariporide (Hoe642), another Na+/H+ exchange inhibitor, were studied in a myocardial ischaemia and reperfusion injury model. Anaesthetized rabbits were subjected to occlusion of the coronary artery for 30 min followed by reperfusion for 5 h. SM-198110 or cariporide was administered before ischaemia and before reperfusion. We also assessed the anti-necrotic effect of SM-198110 when given before reperfusion, both alone and together with glibenclamide, a KATP channel blocker, 5-hydroxydecanoate (5-HD), a mitochondrial KATP channel-selective blocker and 8-(p-sulphophenyl)-theophylline (8-SPT), an adenosine receptor blocker. The infarct size was reduced dose-dependently by i.v. administration of SM-198110 before ischaemia, with a significant reduction in serum creatine phosphokinase activity. Infarct sizes, normalized to the size of the area-at-risk (means±SE) were: vehicle 56.6±3.7%; low-dose SM-198110 39.2±6.3%; mid-dose 32.8±7.4% (P<0.05); high-dose 22.1±6.7% (P<0.01). This anti-necrotic effect of SM-198110 was achieved without significant haemodynamic changes. Cariporide given before ischaemia also reduced infarct size significantly and dose-dependently. SM-198110 administered before reperfusion also resulted in a dose-dependent reduction in the infarct size. Infarct sizes were: vehicle 56.6±3.7%; low-dose SM-198110 44.5±5.7%; mid-dose 36.3±6.6% (P<0.01); high-dose 34.7±3.8% (P<0.01). In contrast, cariporide given before reperfusion did not reduce infarct sizes significantly. The anti-necrotic effect of SM-198110 was observed even when given 10 min after the beginning of reperfusion. Glibenclamide and 5-HD abolished the anti-necrotic effect of treatment before reperfusion with SM-198110. However, the co-administration of 8-SPT with SM-198110 did not affect infarct size. These results suggest that, in addition to Na+/H+ exchange inhibition, mitochondrial and/or sarcolemmal KATP channels contribute to the anti-necrotic effect of SM-198110 when the latter is given before reperfusion.

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Acknowledgements

We thank Ms. Masako Toda and Kenji Miyazaki for excellent technical assistance during the course of this study. We are grateful to other members of Cardiovascular Group for their contribution to this work and for valuable discussion.

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Correspondence to Kazuto Yamada.

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Yamada, K., Matsui, K., Ogawa, S. et al. Reduction of myocardial infarct size by SM-198110, a novel Na+/H+ exchange inhibitor, in rabbits. Naunyn Schmied Arch Pharmacol 371, 408–419 (2005). https://doi.org/10.1007/s00210-005-1062-6

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  • DOI: https://doi.org/10.1007/s00210-005-1062-6

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