Defect internalization and tyrosine kinase activation in Aire deficient antigen presenting cells exposed to Candida albicans antigens
Copyright policy )Defect internalization and tyrosine kinase activation in Aire deficient antigen presenting cells exposed to Candida albicans antigens
Patients with Autoimmune polyendocrine syndrome type I (APS I) present with multiple endocrine failures due to organ-specific autoimmune disease, thought to be T-cell-mediated. Paradoxically, APS I patients suffer from chronic mucocutaneous candidiasis. The mutated gene has been identified as the Autoimmune regulator (AIRE). Aire is expressed in medullary epithelial cells of the thymus and in antigen presenting cells in the periphery. T cells from Aire deficient mice and men displayed an enhanced proliferative response against Candida antigen in vitro, suggesting that Aire deficient T cells are competent in recognizing Candida albicans. In contrast, monocytes from APS I patients displayed a decreased and delayed internalization of zymosan. Furthermore, Candida antigen activated monocytes from APS I patients show decreased and altered phoshotyrosine kinase activation. In conclusion, Aire deficient APCs have a defect receptor mediated internalization of Candida which affects kinase activation, likely altering the innate Candida immune response.
- University of Helsinki Finland
- Karolinska Institute Sweden
- Uppsala University Hospital Sweden
- Akademiska Barnsjukhuset Sweden
Cell Extracts, Male, Antigens, Fungal, T-Lymphocytes, Antigen-Presenting Cells, Protein-Tyrosine Kinases, Lymphocyte Activation, Enzyme Activation, Fungal Proteins, Mice, Inbred C57BL, Mice, Cell Wall, Candida albicans, Animals, Humans, Female, Polyendocrinopathies, Autoimmune, Cells, Cultured, Cell Proliferation, Signal Transduction
Cell Extracts, Male, Antigens, Fungal, T-Lymphocytes, Antigen-Presenting Cells, Protein-Tyrosine Kinases, Lymphocyte Activation, Enzyme Activation, Fungal Proteins, Mice, Inbred C57BL, Mice, Cell Wall, Candida albicans, Animals, Humans, Female, Polyendocrinopathies, Autoimmune, Cells, Cultured, Cell Proliferation, Signal Transduction
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