title: Innate lymphoid cells, precursors and plasticity.
abstract: Innate lymphoid cells (ILC) have only recently been recognized as a separate entity of the lymphoid lineage. Their subpopulations share common characteristics in terms of early development and major transcriptional circuitry with their related cousins of the T cell world. It is currently hypothesized that ILCs constitute an evolutionary older version of the lymphoid immune system. They are found at all primary entry points for pathogens such as mucosal surfaces of the lung and gastrointestinal system, the skin and the liver, which is the central contact point for pathogens that breach the intestinal barrier and enter the circulation. There, ILC contribute to the first line defense as well as to organ homeostasis. However, ILC are not only involved in classical defense tasks, but also contribute to the organogenesis of lymphoid organs as well as tissue remodeling and even stem cell regeneration. ILC may, therefore, implement different functions according to their emergence in ontogeny, their development and their final tissue location. We will review here their early development from precursors of the fetal liver and the adult bone marrow as well as their late plasticity in adaptation to their environment.
authors.affiliation: Research Centre Immunology, University Medical Centre of the Johannes Gutenberg University Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany; Institute of Medical Microbiology and Hygiene, University Medical Centre of the Johannes Gutenberg University Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany; Max-Planck-Institute of Immunobiology and Epigenetics, Stübeweg 51, D79108 Freiburg, Germany.
authors.forename: Konrad
authors.initials: K
authors.lastname: Gronke
authors.affiliation: Research Centre Immunology, University Medical Centre of the Johannes Gutenberg University Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany; Institute of Medical Microbiology and Hygiene, University Medical Centre of the Johannes Gutenberg University Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany; Max-Planck-Institute of Immunobiology and Epigenetics, Stübeweg 51, D79108 Freiburg, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Kofoed-Nielsen
authors.affiliation: Research Centre Immunology, University Medical Centre of the Johannes Gutenberg University Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany; Institute of Medical Microbiology and Hygiene, University Medical Centre of the Johannes Gutenberg University Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany. Electronic address: diefenbach@uni-mainz.de.
authors.forename: Andreas
authors.initials: A
authors.lastname: Diefenbach
mesh_terms: D000818:Animals; D015415:Biomarkers; D002454:Cell Differentiation / Q000235:genetics / Q000276:immunology; D019070:Cell Lineage / Q000235:genetics / Q000276:immunology; D000066670:Cell Plasticity; D018507:Gene Expression Regulation, Developmental; D006801:Humans; D007113:Immunity, Innate; D016131:Lymphocyte Subsets / Q000166:cytology / Q000276:immunology* / Q000378:metabolism*; D010641:Phenotype; D054504:Precursor Cells, T-Lymphoid / Q000166:cytology / Q000276:immunology* / Q000378:metabolism*; D015398:Signal Transduction; D013602:T-Lymphocytes, Cytotoxic / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D006377:T-Lymphocytes, Helper-Inducer / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D015415:Biomarkers; D014157:Transcription Factors
keywords: Development; Innate lymphoid cells; Plasticity; Precursor