期刊
JOURNAL OF EXPERIMENTAL MEDICINE
卷 213, 期 11, 页码 2399-2412出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1084/jem.20160258
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资金
- National Institute for Health Research Clinical Research Network
- British Association of Dermatologists
- British Skin Foundation
- Misses Barrie Charitable Trust
- Medical Research Council [CF7720]
- National Institute for Health Research Biomedical Research Centre [CF7722]
- Cancer Research UK [17722] Funding Source: researchfish
- Medical Research Council [MC_UU_12010/1, MC_UU_12010/5, 1093746] Funding Source: researchfish
- MRC [MC_UU_12010/5, MC_UU_12010/1] Funding Source: UKRI
Psoriasis is a chronic inflammatory skin disease associated with a T helper 17 response. Yet, it has proved challenging to identify relevant peptide-based T cell antigens. Antigen-presenting Langerhans cells show a differential migration phenotype in psoriatic lesions and express constitutively high levels of CD1a, which presents lipid antigens to T cells. In addition, phospholipase A(2) (PLA(2)) is highly expressed in psoriatic lesions and is known to generate neolipid skin antigens for recognition by CD1a-reactive T cells. In this study, we observed expression of a cytoplasmic PLA(2) (PLA(2)G4D) in psoriatic mast cells but, unexpectedly, also found PLA2G4D activity to be extracellular. This was explained by IFN-alpha-induced mast cell release of exosomes, which transferred cytoplasmic PLA(2) activity to neighboring CD1a-expressing cells. This led to the generation of neolipid antigens and subsequent recognition by lipid-specific CD1a-reactive T cells inducing production of IL-22 and IL-17A. Circulating and skin-derived T cells from patients with psoriasis showed elevated PLA2G4D responsiveness compared with healthy controls. Overall, these data present an alternative model of psoriasis pathogenesis in which lipid-specific CD1a-reactive T cells contribute to psoriatic inflammation. The findings suggest that PLA2 inhibition or CD1a blockade may have therapeutic potential for psoriasis.
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