Abstract
Ischemic preconditioning (IPC) is a phenomenon by which a brief period of ischemia or hypoxia can result in an adaptive cardioprotective effect when the myocardium is subjected to a more prolonged ischemic insult. IPC occurs in all animals studied as well as in humans and has two phases, an early phase that lasts for 1–2 h following the IPC stimulus and a delayed phase or second window of protection (SWOP) that appears 12–24 h after IPC and lasts for 48–72 h (Przyklenk and Kloner, 1998). A number of mediators (i.e., adenosine, bradykinin, and opioids) and signaling pathways [i.e., tyrosine kinase (TK) and protein kinase C (PKC)] are involved in triggering the transduction of the preconditioning stimulus to the appropriate end effector in the heart. The end effector is most likely an enzyme, a small heat-shock protein (HSP), or an ion channel. The majority of evidence suggests that the ATP-sensitive potassium channel (KATP channel) is the end effector of both early and delayed IPC and pharmacologically induced preconditioning, and information will be presented to support this hypothesis. Recently, controversy has arisen as to whether the KATP channel subtype is responsible for the preconditioning effect is the surface or sarcolemmal channel (sarc KATP) or the mitochondrial channel (mito KATP), and evidence will be presented both for and against a role for these channel subtypes in classical or delayed IPC. Theories will also be presented concerning the mechanisms by which opening of the sarc KATP or mito KATP channels produces the cardioprotective effect of IPC. Finally, a comment will be made concerning future directions and questions that still need to be answered as to the role and function of the KATP channel in cardiac preconditioning.
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Gross, G.J. (2001). Role of ATP-Sensitive K+ Channels in Cardiac Preconditioning. In: Archer, S.L., Rusch, N.J. (eds) Potassium Channels in Cardiovascular Biology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1303-2_38
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DOI: https://doi.org/10.1007/978-1-4615-1303-2_38
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