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The effect of ischaemia-reperfusion on [3H]inositol phosphates and Ins(1,4,5)P3 levels in cardiac atria and ventricles — a comparative study

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Abstract

In this study incorporation of [3H]inositol into inositol phosphates and phosphoinositides as well as tissue Ins(1,4,5)P3 levels of the atria and ventricles of isolated, perfused rat hearts were compared. Although the incorporation of [3H]inositol into the phosphoinositides of atria and ventricles was similar, significantly higher (2–3 fold) incorporation rates into inositol phosphates were observed in atrial tissue. Using a D-myo-[3H]Ins(1,4,5)P3 assay system, the Ins(1,4,5)P3 levels observed in atria from perfused rat hearts were also significantly higher than those obtained under the same experimental circumstances in the ventricles.

Since previous studies on whole hearts showed inhibition of the phosphatidylinositol (PI) pathway during ischaemia with an immediate significant stimulation upon reperfusion [12, 20], the effects of ischaemia and 1 min postischaemic reperfusion were also examined separately in atria and ventricles. The results showed that 20 min of global ischaemia significantly depressed Ins(1,4,5)P3 levels as well as incorporation of [3H]inositol into ventricular InSP2 and InSP3. Reperfusion caused an immediate (within 1 min) increase in Ins(1,4,5)P3 levels and also [3H]inositol incorporation into all three cytosolic inositol phosphates in the ventricles. However, the effect of ischaemia and reperfusion on Ins(1,4,5)P3 levels as well as the incorporation of [3H]inositol into the inositol phosphates were less prominent in the atria. It therefore appears that the differential responses of the atria and the ventricles to an oxygen deficiency [41] are also reflected in the differences in PI metabolism during ischaemia-reperfusion.

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Authors and Affiliations

  1. Department of Medical Physiology and Biochemistry, MRC Program for Experimental Biology, University of Stellenbosch Medical School, P. O. Box 19063, 7505, Tygerberg, South Africa

    R. Mouton, S. Genade, B. Huisamen, M. Malan & A. Lochner

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  1. R. Mouton
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  2. S. Genade
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  4. M. Malan
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Mouton, R., Genade, S., Huisamen, B. et al. The effect of ischaemia-reperfusion on [3H]inositol phosphates and Ins(1,4,5)P3 levels in cardiac atria and ventricles — a comparative study. Mol Cell Biochem 115, 195–202 (1992). https://doi.org/10.1007/BF00230331

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  • DOI: https://doi.org/10.1007/BF00230331

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