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Fifty-odd years have elapsed since the first observation of the response of visceral smooth muscle to an adenine nucleotide was reported by Drury and Szent Gyorgi (1929). It is now known that purinergic receptors mediating responses to adenosine and the adenine nucleotides (AMP, ADP and ATP) are present in all types of visceral smooth muscle. Adenine itself and other endogenous purine derivatives appear to have no direct effects, or only minimal effects, on most visceral smooth muscles. Airway smooth muscle is an exception in this regard, and responds to purine bases and non-adenine nucleosides and nucleotides. Knowledge of the distribution of purinergic receptor sites on the plasma membrane of visceral musculature has grown particularly rapidly since Burnstock and his colleagues (1970) proposed that ATP, or a related adenine derivative, is the inhibitory transmitter released from non cholinergic non-adrenergic nerves present in the gut. Much evidence has been presented favoring the view that ATP is the inhibitory transmitter, and evidence to the contrary has also been put forward. The hypothesis remains controversial primarily because specific blockers of the postsynaptic purinergic site, with which the hypothesis might be tested, have not been found. Nevertheless, the numerous studies designed to investigate the purinergic nerve hypothesis have generated much information concerning the nature of the purinergic receptors in visceral smooth muscle.
This book aims to provide a brief update on the functions of purinergic receptors in various systems, in addition to the signaling pathway activated to mediate these functions. We address the influence of hypoxia by modulating the activity of these receptors under physiological and pathophysiological conditions. Additionally, we describe the mechanisms of induction of pain and inflammation in different systems. Finally, the book discusses some of the main bioinformatics tools currently used to improve or discover new prototypes capable of selectively acting on these receptors with estimated parameters of satisfactory solubility and toxicity for possible commercial implementation.
In the first 20 years that followed the purinergic signalling hypothesis in 1972, most scientists were sceptical about its validity, largely because ATP was so well established as an intracellular molecule involved in cell biochemistry and it seemed unlikely that such a ubiquitous molecule would act as an extracellular signalling molecule. However, after the receptors for ATP and adenosine were cloned and characterized in the early 1990s and ATP was established as a synaptic transmitter in the brain and sympathetic ganglia, the tide turned. More recently it has become clear that ATP is involved in long-term (trophic) signalling in cell proliferation, differentiation and death, in development and regeneration, as well as in short-term signalling in neurotransmission and secretion. Also, important papers have been published showing the molecular structure of P2X receptors in primitive animals like Amoeba and Schistosoma, as well as green algae. This has led to the recognition of the widespread nature of the purinergic signalling system in most cell types and to a rapid expansion of the field, including studies of the pathophysiology as well as physiology and exploration of the therapeutic potential of purinergic agents. In two books, Geoffrey Burnstock and Alexej Verkhratsky have aimed at drawing together the massive and diverse body of literature on purinergic signalling. The topic of this first book is purinergic signalling in the peripheral and central nervous systems and in the individual senses. In a second book the authors focus on purinergic signalling in non-excitable cells, including those of the airways, kidney, pancreas, endocrine glands and blood vessels. Diseases related to these systems are also considered.
Illustrations by Lorie M. Gavulic, MFA Sponsored by the American Society for Neurochemistry.
This is an overview of the fast-moving field of purinergic signalling through adenosine and ATP receptors. Authors are the leading authorities in their fields Subject matter is important for understanding tissue protection Subject matter is of intense interest for new drug development
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Physiological, pharmacological and molecular biological data generated over the past three decades have demonstrated the existence of two major families of extracellular receptors, the P1, a family of four G-protein coupled receptors and the P2, a family of at least 12 receptors responsive to purine (ATP, ADP) and pyrimidine (UTP) nucleotides through which adenosine and ATP can function as extracellular messengers. The present two-part volume represents an integrated compendium of invited chapters by leading researchers in the area focusing on advances in the understanding of purinergic and pyrimidinergic signaling systems, their role(s) in tissue function and pathophysiology and advances in developing potential new medications based on the modulation of P1 and P2 receptor signaling processes. The volumes will thus provide the reader with a topical, comprehensive and integrated overview of this important area.
This book overviews purinergic receptors that are playing key roles in human and pathophysiological processes. The book elaborates on how selective P1 and P2 modulators have been developed as therapeutics for a variety of diseases. It also provides an overview of current perspectives in the design of purinergic receptor modulators and future challenges such as the availability of selective ligands for all receptor subtypes. Divided into 12 chapters, this comprehensive volume also offers a multidisciplinary perspective on the historical evolution, starting with a chapter devoted to the roots and early discoveries of adenosine and its receptors, followed by a twenty-year retrospective on the synthesis, properties, and functional potential of adenosine receptor ligands, probes, and functional conjugates. In the next chapters, experts in the field delve into topics such as the therapeutic potential of adenosine receptor ligands in wound healing and fibrosis, the therapeutic benefits of A2A receptor antagonists, the A2B adenosine receptor as a target for brain ischemia or demyelination, the development and latest advancements in clinical trials of A3 adenosine receptor ligands. Other chapters describe bifunctional tools to study adenosine receptors, allosteric modulators of adenosine receptors, and new computational approaches to inspect adenosine receptor-ligand recognition processes. Furthermore, the book discusses the role of P2X4 receptors in immunity and inflammation. The final chapters illustrate CD73 inhibitors as antitumor agents, and bacterial ectonucleotidases as underexplored antibacterial drug targets. This book is a valuable resource for scholars working in the field of medicinal chemistry, as well as researchers in the industry, providing readers with a comprehensive understanding of adenosine receptor biology and its therapeutic potential.