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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

hepatitis B virus --- innate immunity --- adaptive immunity --- antigen-specific immune response --- treatment

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The Nod-like receptor (NLR) family of proteins are evolutionary conserved molecules that in plants and mammals have been implicated in innate immune sensing of microbes and infection-associated physiological changes, contributing to immune protection of the challenged host organism through the instruction of inflammatory responses, antimicrobial defense and adaptive immunity. Recent data however suggests that the biological roles of NLR go beyond the function of classical pattern recognition molecules (PRM) as they have been implicated in essential cellular processes including autophagy, apoptosis, modification of signal transduction and gene transcription as well as reproductive biology. In this research topic, we aim to provide a comprehensive state-of the art overview of the emerging functions of NLR in plant and mammalian immunity, cell biology and reproductive biology. Potential topics may include, but are not limited to the following areas: • Functions of NLRs as PRMs in infection • Cross-talk of NLRs with other PRMs • Signal transduction pathways of NLRs • New functions of NLRs other than pattern recognition • Structural aspects of NLR activation • Mechanisms of NLRs in cell biological processes • Aspects of NLRs in reproductive biology • Functions of NLRs in plant immune responses

Adaptive Immunity --- PAMP --- pathogens --- MAMP --- innate immunity --- Bacteria --- Sensing --- virus --- LRR --- DAMP

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The goal of this research topic was to gather current knowledge on the interaction of bacterial exotoxins and effector proteins with the host immune system. The following 16 research and review articles in this special issue describe mechanisms of immune modification and evasion and provide an overview over the complexity of bacterial toxin interaction with different cells of the immune system.

Adaptive Immunity --- Super antigen --- Immune Evasion --- Quorum Sensing --- Bacterial Toxins --- innate immune response --- infectious diseases --- Bacterial effector protein

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This book provides an essential overview of the role of phosphoinositide-3-phosphate kinase (PI3K) isoforms in modulating the function of immune system cells and their involvement in disease. PI3K is a family of kinases involved in basic cellular processes such as proliferation, migration and cell death. Recent work has highlighted the multiple roles of PI3K classes and subunits and their involvement in the immune response to the body’s own and foreign antigens and diseases such as cancer and autoimmunity. This book offers a detailed introduction to the biology of the three PI3K classes, followed by an extensive discussion of the diverse roles of AKT and PI3K isoforms in immune cells. Based on this knowledge, it subsequently explains in more detail how specific isoforms are connected to immune-mediated diseases. The book concludes by highlighting the latest advances in the production of isoform-specific inhibitors and their use in various human diseases. This book is intended as a reference guide for students and researchers interested in the multifaceted aspects of PI3K biology.

Histology. Cytology --- Immunology. Immunopathology --- immunologie --- cytologie --- histologie --- Immunology. --- Immune system. --- Cellular signal transduction. --- Cytology. --- Autoimmunity. --- Immunospecificity. --- Immune Cell Signalling. --- Cell Biology. --- Adaptive Immunity. --- Fosfatidilinositols --- Immunitat cel·lular

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Natural Killer (NK) cells are innate lymphocytes, now recognized as members of a larger family of “Innate lymphoid cells” (ILCs). Both murine and human NK cells are well characterized effector cells with cytotoxic as well as cytokine production ability which mainly react in response to microbial and cell stress stimuli, thus playing a central role in the defense against pathogen infection, in tumor surveillance and in regulating immune homeostasis. Despite these established concepts, our understanding of the complexity of NK cells, also in view of their developmental and functional relationship with other ILC subsets, is only recently emerging. This Research Topic highlights the recent advances in NK cell (and ILC) research in human and mouse from basic research to clinical applications.

natural killer cells --- ILC --- NK cells --- immune therapy --- viral infection --- NK cell education --- immunotherapy --- MHC-I --- cancer --- immune regulation --- adaptive immunity