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This book is about the recent advances in the structural and functional characterization of receptors that influence intracellular signalling events through interaction with intracellular GTP-binding proteins (G proteins). Molecular cloning of members of the G protein-coupled receptor superfamily has complemented pharmacological investigations in providing a realization of the structural and functional diversity of these receptors. An increased understanding of the involvement of particular receptor subtypes in normal and pathophysiological processes represents exciting possibilities for the development of highly specific and effective therapeutic agents.

This book is about the unique ability of the heart to protect itself against the serious consequences of an abrupt reduction in blood flow to the myocardium - a phenomenon which is switched on by stress and termed myocardial preconditioning. This volume describes the main features and characteristics of preconditioning, with respect to the time-course of the protective effect of the phenomenon (first and second windows) and the different sequelae of myocardial ischaemia against which it protects, such as myocardial injury, arrhythmias and contractile dysfunction. The proposed mechanisms underlying the fascinating form of cardioprotection are discussed. Among these are the role of endogenous labile mediators, receptor-linked G proteins, ATP-sensitive potassium channels and protein kinase C activation.