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lüll Skin-resident T cells: the ups and downs of on site immunity Clark RAJ Invest Dermatol 2010[Feb]; 130 (2): 362-70The cutaneous surface of a normal adult individual contains approximately 20 billion T cells, nearly twice the number present in the entire circulation. Recent studies have shown a role for these cells in both normal immunity and in inflammatory skin diseases such as psoriasis. Regulatory T cells protect against autoimmune reactions to self antigens and assist in the resolution of cutaneous inflammation. However, they can also shield tumors from immune detection, allow latent infections to persist and can dysfunction under the conditions present in inflammatory skin diseases. Th17 T cells protect organisms against extracellular pathogens but also have a key role in the pathogenesis of psoriasis. Evidence suggests that effector memory T cells produced during immune reactions survive and persist long term within the skin, providing local and rapid protection against pathogen reexposure. This review summarizes the current understanding of how skin-resident T cells contribute to normal and aberrant immunity in the skin.|Animals[MESH]|Autoimmunity[MESH]|Endocytosis[MESH]|Humans[MESH]|Immune System[MESH]|Immunologic Memory[MESH]|Inflammation[MESH]|Interleukin-17/chemistry[MESH]|Mice[MESH]|Models, Biological[MESH]|Psoriasis/immunology[MESH]|Skin Physiological Phenomena[MESH]|Skin/*metabolism/pathology[MESH]|T-Lymphocyte Subsets/immunology[MESH]|T-Lymphocytes/*metabolism[MESH] |