Early Preconditioning
Is thought to be stimulated by local action of adenosine, opiates and bradykinin which are all endogenously released by ischemic cells. The presence of each substance is not required but the protection is more potent if they are. They activate G-protein coupled pathways, which carries a protective signal to an end-effector. There have been many suggestions to what this might be, the sarcolemmal ATP-sensitive potassium channel, the mitochondrial ATP-sensitive potassium channel, the mitochondrial permeability transition pore, reactive oxygen species generation, chloride channels, the inward rectifier potassium channel and connexon 43 related channels.
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