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Pattern recognition receptors Hayashi T; Nakamura T; Takaoka ANihon Rinsho Meneki Gakkai Kaishi 2011[]; 34 (5): 329-45Immunity is based on self/nonself discrimination. In vertebrates, two major systems, innate and adaptive immune systems, constitute host defense against invading microbes. Adaptive immunity is characterized by specific immune responses through B- or T-cell antigen receptors that are generated by somatic recombination, whereas nonspecific responses to microbes had been accentuated in innate immunity. However, the discovery of pattern recognition receptors (PRRs) that are encoded in the germ-line, including Toll-like receptors, RIG-I-like receptors, NOD-like receptors and AIM2-like receptors, advanced our understanding of a mechanism for innate immune recognition. These types of PRR recognize pathogen- or damage-associated molecular patterns (PAMPs or DAMPs) during infection or tissue damage, and commonly evoke the downstream gene induction programme, such as expression of type I interferons, inflammatory cytokines and chemokines. Dysregulation of PRR-triggered signal activation leads to pathologic inflammatory responses. In this regard, it has been shown that many of "autoinflammatory diseases", recently defined clinical entity, have putatively causative mutations in the genes that encode PRRs or their signaling mediators. In this review article, we describe recent overview of PRRs as innate sensors and update knowledge of "autoinflammatory diseases" particularly by focusing on their association with innate signaling.|Adaptor Proteins, Signal Transducing/physiology[MESH]|Autoimmunity/genetics/immunology[MESH]|Carrier Proteins/physiology[MESH]|Cytokines/metabolism[MESH]|Cytoskeletal Proteins/physiology[MESH]|Hereditary Autoinflammatory Diseases/*genetics/*immunology[MESH]|Humans[MESH]|Immunity, Innate/genetics/immunology[MESH]|Inflammasomes/physiology[MESH]|Inflammation Mediators/metabolism[MESH]|Interleukin-1beta/metabolism[MESH]|Intracellular Signaling Peptides and Proteins/physiology[MESH]|NF-kappa B[MESH]|NLR Family, Pyrin Domain-Containing 3 Protein[MESH]|Nod2 Signaling Adaptor Protein/physiology[MESH]|Pyrin[MESH]|Receptors, Pattern Recognition/genetics/*immunology[MESH]|Signal Transduction/genetics[MESH] |
