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Role of catalase in myocardial protection against ischemia in heat shocked rats

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Abstract

It was recently reported that in rats exposure to heat shock leads to appearance of a myocardial heat shock protein (HSP 70) and to an increase in myocardial catalase activity. This correlated with an improvement in post-ischemic function either in Langendorff-perfused hearts after low-flow ischemia or in working hearts after short-term, no-flow ischemia. We investigated the effect of the same hyperthermic treatment on functional recovery from no-flow ischemia of various durations in isolated working rat hearts performing at high or low external workloads. Rats were heated to core temperature of 42° C for 15 min. No significant protein oxidation (% oxidized methionine) was observed 2.5 hr after treatment. A protein with migration characteristics similar to HSP 70 was observed in hearts of heat shocked rats 24 hr after this treatment while their myocardial catalase activity was not increased. Hearts of similarly treated rats were excised 24 hr after hyperthermia and perfused in a working mode with Krebs-Henseleit buffer (1.25 mM Ca2+, 11 mM glucose). At 15 cm H2O preload and 100 cm H2O afterload after 30 min no-flow ischemia, control hearts recovered to 36.9%, 2%, 47.6%, and 21.5% of the preischemic values of heart rate-peak systolic pressure product (RPP), aortic output, coronary flow, and cardiac output, respectively. After only 25 min of ischemia the respective recovered values were 61.6%, 11.5%, 58.7%, and 33.5%. Throughout the recovery period these hemodynamic values were consistently higher in hearts of heat shocked animals than in those of control hearts but the differences were not statistically significant. After 25 min ischemia only 2 out of 7 control hearts recovered some aortic output, whereas in the heat shocked animals all 5 hearts recovered. After only 20 min of no-flow ischemia and at a lower workload (12.5 cm H2O preload and 75 cm H2O afterload), control hearts recovered to 85.1% of RPP, 54.1% of aortic output, and 68.3% of cardiac output. None of these variables was significantly improved by heat shock pretreatment. In summary, we were unable to demonstrate a similar degree of protective effect of heat shock pretreatment as compared to other reports where both HSP 70 and increased catalase activity were present. The reason(s) could be related to lack of induction of myocardial catalase activity in our study.

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  1. Department of Physiology, Faculty of Medicine, University of Ottawa, 451 Smyth Road, K1H 8M5, Ottawa, Ontario, Canada

    Stephen R. Wall, Henry Fliss & Borivoj Korecky

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  1. Stephen R. Wall
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Wall, S.R., Fliss, H. & Korecky, B. Role of catalase in myocardial protection against ischemia in heat shocked rats. Mol Cell Biochem 129, 187–194 (1993). https://doi.org/10.1007/BF00926367

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