Chemokines And Viral Infection

In the past five years, a large number of new chemokines and chemokine receptors have been identified. Alarming progress in the areas of bioinformatics and expressed sequence tag (EST) databases attributed to this development. Recent discoveries provide compelling evidences supporting the roles of these messengers and their receptors in the control of viral infection as well as in aiding virus survival. Chemokines in Viral Infections is the first to provide a comprehensive write up on the various evidences available to date on the interactions between host chemokine system and viral chemokines. This book intends to unravel the chemokine constellation in the context of viral infections, a versatility that was not fully understood five years ago. This book is excellent reading material and will be of interest to research scientists, clinicians and postgraduate students.

Chemokines represent a family of over 40 small proteins that, for the most part, are secreted into the environment and function by binding to G protein-coupled receptors (GPCRs) that are expressed on numerous different cell types. When initially identified close to 30 years ago, these molecules were associated with various human inflammatory diseases and it was recognized that expression may be integral in leukocyte recruitment to inflamed tissue. Within a relatively short period of time, early participants within the field determined that these proteins displayed distinct and conserved structural features and exerted potent chemotactic effects on defined lymphocyte subsets. There are now four sub-families of chemokines identified based on defined structural criteria relating to the positional location of conserved cysteine residues within the amino-terminus of the protein. Chemokines are now recognized as important in numerous biological processes ranging from maintaining the organizational integrity of secondary lymphoid tissue to participating in various aspects of both innate and adaptive immune responses following microbial infection.

A comprehensive review of what is known about the role of cytokines and chemokines in a variety of human infectious diseases, including gram-negative and -positive infections, listeriosis, mycobacterial infections, lyme arthritis, pneumonia, fungal infections, HIV, leishmaniasis, and sepsis. The authors demonstrate the different cytokine and chemokine production profiles in response to a wide variety of pathogens and the importance of host genetic factors in determining the type and magnitude of responses to a given microorganism. They also critically evaluate the use of cytokines and anticytokines in the treatment of infectious diseases and show how knowledge of cytokine pleiotropic effects, redundancy, and the complexity of the cytokine network has led to better design and better outcomes in cytokine-based therapies for specific infections.

The chemokines family of small proteins are involved in numerous b- logical processes ranging from hematopoiesis, angiogenesis, and basal l- kocyte trafficking to the extravasation and tissue infiltration of leukocytes in response to inflammatory agents, tissue damage, and bacterial or viral infection. Chemokines exert their effects through a family of seven G-protein coupled transmembrane receptors. Worldwide interest in the chemokine field surged dramatically early in 1996, with the finding that certain chemokine receptors were the elusive coreceptors, required along with CD4, for HIV infection. Today, though over 40 human chemokines have been described, the n- ber of chemokine receptors lags behind—only 17 human chemokine receptors have been identified so far. What has emerged over the years is that most chemokine receptors bind several distinct ligands, and indeed the majority of chemokines are able to bind to multiple chemokine receptors, explaining to some extent the apparent disparity in the numbers of chemokines and rec- tors. Yet in spite of the apparent redundancy in chemokine/chemokine rec- tor interactions, it is clear that in vivo, spatial, temporal, and indeed cell- and tissue-specific expression of both chemokines and their receptors are imp- tant factors in determining the precise nature of cellular infiltrates in phy- ological and pathological processes.

Chemokines are a superfamily of small proteins which play a crucial role in immune and inflammatory reactions and in viral infection. They attract and activate leukocytes and regulate diverse cellular systems and organs ranging from blood vessels to the central nervous system. This book provides an overview of the main structural and functional features of chemokines. It presents recent studies which indicate that chemokines regulate the trafficking of dendritic cells and hence the activation of specific immunity and the subsequent orientation of immunity. This volume will be a useful reference for immunologists, virologists, oncologists, pharmacologists and neurobiologists.

Persistent Viral Infections Edited by Rafi Ahmed Emory Vaccine Center, Atlanta, USA and Irvin S. Y. Chen UCLA School of Medicine, Los Angeles, USA During the past decade much of our attention has focused on diseases associated with viral persistence. Major breakthroughs in immunology, and the advent of molecular approaches to study pathogenesis have increased our understanding of the complex virus-host interactions that occur during viral persistence. Persistent Viral Infections focuses on: * The pathogenesis and immunology of chronic infections * Animal models that provide, or have the potential to provide, major insights This volume will be essential reading for virologists, immunologists, oncologists and neurologists.

Caroline Hébert and a panel of key experimentalists and clinical investigators comprehensively review the state-of-the-art in the chemokine field, ranging from the effects of chemokines and their receptors in retroviral infections, to their role in inflammation, angiogenesis/angiostasis, and tumor cell biology. The book examines in detail fifteen recently identified chemokines and elucidates the role of chemokine function in vivo from animal experiments. Animal models are also used to explore how chemokines operate in a variety of chronic and acute inflammatory diseases and in noninflammatory processes. A detailed review of the emerging role of chemokines in viral biology is also presented, with emphasis on HIV biology and novel therapeutic possibilities. Chemokines in Disease: Biology and Clinical Research summarizes the rapidly expanding knowledge of a dazzling array of chemokines and provides fresh insights into the development of powerful new drugs for treating a wide spectrum of diseases.