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The classical understanding of the mechanism of anti-anginal or anti-ischemic drugs is an increase in blood supply to the heart and/or a decrease in oxygen consumption of the heart, maintaining energy balance in the heart between supply and demand and hence maintaining the tissue levels of high-energy phosphates. This scheme is reasonable. During reperfusion following ischemia, however, there is more serious damage to the heart, although the tissue levels of high-energy phosphates increase. This is probably because toxic substances are generated in the heart during ischemia/reperfusion. We propose that both lysophosphatidylcholine and palmitoyl-L-carnitine that accumulate in the myocardium during ischemia/reperfusion are candidates for the toxic substances that accelerate ischemia/reperfusion damage to the heart. Therefore, drugs that have anti-lysophosphatidylcholine and/or anti-palmitoyl-L-carnitine effects are promising for the treatment of ischemic heart diseases. We found that K-7259, a novel derivative of dilazep having a minimal effect on the normal heart, is a drug that attenuates the deleterious effects of both lysophosphatidylcholine and palmitoyl-L-carnitine on the heart, and therefore attenuates the ischemia/reperfusion damage.

A new approach to the understanding of the mechanism of ischemia/reperfusion damage in the heart and the effects of anti-ischemic drugs.