The innate immune system has evolved means to recognize and react suitably to foreign entities such as infectious agents. In many cases infectious microorganisms threaten the integrity and function of the target organs or tissues; therefore, consequent to their recognition the immune system becomes activated to ensure their elimination. Toll-like receptors (TLR) constitute a family of receptors specialized in the recognition of molecular patterns typically associated with infectious agents. Different TLRs exist, each selective for molecular entities and motifs belonging to a specific pathogen group. Consequently, it is thought that the molecular nature of invading microorganisms activates specific TLRs to drive adequate anti-infectious immunity. For instance, nucleic acid-specific, intracellular receptors (TLR3/7/8/9) are used to sense viruses and drive antiviral immunity, while other receptors (such as TLR2 and TLR4) recognize and promote immunity against bacteria, yeast, and fungi. Yet, it is becoming evident that activation of TLR pathways trigger mechanisms that not only stimulate but also regulate the immune system. For instance, TLR stimulation by viruses will drive antiviral interferon but also immunoregulatory cytokine production and regulatory T cell activation. Stimulation of TLRs by bacteria or using molecular agonists can also trigger both immune stimulatory and regulatory responses. TLR stimulation by infectious agents likely serves to activate but also control anti-infectious immunity, for instance prevent potential immunopathological tissue damage which can be caused by acute immune defense mechanisms. Previous work by us and others has shown that the immunoregulatory arm of TLR stimulation can additionally help control autoreactive processes in autoimmune disease. Hence, it is becoming established that gut commensals, which also play a crucial part in the control of autoimmune disease, establish immune regulatory mechanisms through activation of particular TLRs. In sum, it appears that TLRs are key immune players that not only stimulate but also regulate immune processes in health and disease. In this Research Topic, we wish to review the dual role of TLRs as activators and regulators of immune responses. We aim to motivate data-driven opinions as to the importance of context of TLR agonism for determining immune activation vs. regulation. The presentation of ongoing original works, as well as data and opinions around other innate immune receptors pertaining to this topic, are also encouraged.

This volume provides methods on the role of TLRs in immune responses and on the various approaches targeting different TLRs in cancer, autoimmunity and in vaccine development. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and key tips on troubleshooting and avoiding known pitfalls. Authoritative and cutting-edge, Toll-Like Receptors: Methods and Protocols aims to be a useful and practical guide to new researchers and experts looking to expand their knowledge.

This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.

The third edition of this acclaimed work provides clinicians and investigators with a wealth of state-of-the-art information that will lead to fresh approaches in thinking about liver physiology and liver diseases. Developed by a panel of renowned international authors, this edition outlines a range of important advances in our understanding of the liver’s role as an immune organ and the functions of innate and adaptive immunity in the pathogenesis of all liver diseases. Indeed, the liver is a vitally important immune organ producing liver-derived products that can trigger the innate and adaptive immune system to initiate, mediate, regulate, and resolve systemic inflammation. The book begins with an analysis of the core concepts of immunology, including the definition of autoimmunity and its unique application to the liver, a tolerogenic organ. Subsequent chapters then explore the biological elements of liver diseases caused by epigenetics, genetics, and innate and adaptive immunity. Specific clinical presentations and aspects of liver diseases are also examined, such as Hepatitis C, non-alcoholic fatty liver disease and parasitic infections. Closing chapters then discuss liver diseases among specific populations, including pediatrics, those with comorbidities and preexisting conditions, pregnant women, and finally patients with transplanted organs. A timely and invaluable update to the clinical literature, Liver Immunology: Principles and Practice, Third Edition, is once again a comprehensive work that will not only enhance the understanding of liver diseases but also provide the kind of novel insights that greatly accelerates the evidence-based care of children and adults afflicted with these diseases. This volume is again a must-read for clinicians at all levels, for investigators and for students.

Immune or immunological tolerance is the process by which the immune system does not attack an antigen. It occurs in three forms: central tolerance, peripheral tolerance and acquired tolerance. Central tolerance is immunological tolerance developed during T and B cell differentiation. Peripheral tolerance is immunological tolerance developed after T and B cells mature and enter the periphery. Acquired or induced tolerance is the immune system's tolerance for external antigens. This book presents the latest research from around the world.

This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.

This book contains twelve chapters contributed by prestigious international experts who are at the forefront of B cell research, and aims to provide a cutting-edge and comprehensive overview of all aspects of B cells, including B cell development, maturation and activation, germinal center reaction, memory and plasma cell differentiation, and antibody-mediated positive and negative regulation of humoral immune responses. There are also three chapters describing human diseases caused by B cell abnormalities, including primary antibody deficiencies, autoimmune diseases, and B cell malignancies. We hope that this book will become a standard and routine reference for both basic researchers and clinicians.

Toll-Like Receptors—Advances in Research and Application: 2013 Edition is a ScholarlyEditions™ book that delivers timely, authoritative, and comprehensive information about Toll-Like Receptor 1. The editors have built Toll-Like Receptors—Advances in Research and Application: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Toll-Like Receptor 1 in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Toll-Like Receptors—Advances in Research and Application: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.

This volume in The Year in Immunology series focuses on reviews covering novel approaches to our understanding of immunoregulatory mechanisms. A wide-range of topics is covered within this volume, including: Lineage determination of T cells Roles of various receptors in B-cell activation Activation of plasmactyoid dendritic cells Micro-RNAs (miRNAs) in inflammation and immunity Autoimmune disorders NOTE: Annals volumes are available for sale as individual books or as a journal. For information on institutional journal subscriptions, please visit www.blackwellpublishing.com/nyas. ACADEMY MEMBERS: Please contact the New York Academy of Sciences directly to place your order (www.nyas.org). Members of the New York Academy of Science receive full-text access to the Annals online and discounts on print volumes. Please visit http://www.nyas.org/MemberCenter/Join.aspx for more information about becoming a member.