Claire M. Fraser

Ian Creese

"Dopamine Receptors" precisely chronicles the research being done on dopamine receptors, appraises the techniques and strategies being used, and provides thoughts on future trends. This volume is unique for its multidisciplinary coverage of dopamine receptors, with contributions ranging from physiological and behavioral studies to the biological characterization of dopamine receptors. Examines classifications of receptor subtypes based on ligand binding and adenylate cyclase studies, biochemical analysis, electrophysiological observations and autoradiography. This book also summarizes dopamine receptor involvement in a number of diseases and covers the role of autoreceptors in modulation of dopaminergic systems.

Dopamine Receptors

George Breese

Our understanding of the functional mechanisms relating dopamine activity to normal and abnormal behavior has been turned "upside-down" by the recent developments described in the chapters of this volume. Heretofore, it was generally agreed that all of the pharmacological and behavioral properties ascribed to dopamine systems were mediated via activation or inhibition of the subtype of dopamine receptors termed D2. The properties of these receptors were first characterized in 1975 following their identification by receptor binding techniques utilizing 3H-butyrophenones, potent antipsychotic drugs, used in the treatment of schizophrenia. Although another subtype of dopamine receptor had already been identified a few years earlier, now termed the Dl receptor, its functional properties were unknow- other than the fact that it was associated with the activation of the enzyme adenylate cyclase. Our absence of knowledge of the behavioral functions of this receptor stemmed primarily from the lack of selective agonist and antagonists for DI receptors - drugs which did not also interact with D2 receptors. Selective agents for D2 receptors did exist and hence the behavioral roles of D2 receptors were easily ascribed. The work described in this text is primarily stimulated by the development of two selective Dl receptor drugs - the antagonist SCH 23390 and the agonist SKF 38393. The studies described herein clearly show that D1 receptors do indeed have many behavioral functions, on the surface often similar to those responses mediated by D2 receptors.

Ian Creese

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