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- W2017568872 abstract "The present study investigated if the inotropic effect of angiotensin II (AngII) is altered during post-ischaemic reperfusion in hearts subjected to mild and severe ischaemia. The possible involvement of protein kinase C (PKC) in the change in the inotropic effect was also investigated.Isolated Langendorff-perfused rat hearts were perfused under constant flow with oxygenated Krebs-Henseleit buffer and paced at 360 beats min(-1). A saline-filled balloon catheter inserted into the left ventricle was used for measurement of contractile force. In the first series of experiments, hearts were subjected to continuous perfusion, 15- or 25-min global ischaemia followed by 45-min reperfusion. At the end of reperfusion, 0.1 micromol L(-1) AngII was infused for 5 min. In a second series of experiments, AngII was infused in hearts subjected to 25-min ischaemia followed by 45-min reperfusion in the absence or presence of the PKC inhibitor chelerythrine chloride (5 micromol L(-1)).The current study demonstrates that AngII exerts a positive inotropic effect in normoxic hearts with an increase of left ventricular developed pressure (LVDP) by 11% (P<0.05 vs. prior to AngII infusion). In post-ischaemic hearts subjected to 15-min ischaemia no effect of AngII was observed. In hearts subjected to 25 min of ischaemia, however, AngII evoked a negative inotropic response with a decrease of LVDP by 18% (P<0.05 vs. prior to AngII infusion). The negative inotropic effect of AngII was inhibited by the PKC inhibitor chelerythrine chloride.AngII exerts negative inotropic effect in severely injured post-ischaemic heart, possibly through the PKC pathway." @default.
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- W2017568872 date "2003-06-20" @default.
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- W2017568872 title "Various inotropic effects of angiotensin II in post-ischaemic rat hearts depending on ischaemic time with possible involvement of protein kinase C" @default.
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- W2017568872 doi "https://doi.org/10.1046/j.1365-201x.2003.01143.x" @default.
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