Experimental dermatology · 2010
Functional characterization of T cells differentiated in vitro from bone marrow-derived CD34 cells of psoriatic patients with family history.
СтатьяПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод в очереди
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Zhang Kaiming, Li Xinhua, Yin Guohua, Liu Yufeng, Tang Xuyuan
Аннотация
BACKGROUND: The strong but complex genetic background suggests that inherent and intrinsic rather than exogenous factors have a key role in immunopathogenesis of psoriasis. It is reasonable to speculate that the dysfunctional activity of psoriatic T cells may partly originate from the abnormal haematopoietic cells.
OBJECTIVES: To test if T cells originated from haematopoietic progenitor cells in psoriasis patients display functional alternations similar to previously reported abnormalities of circulating T cells.
METHODS: Bone marrow CD34(+) haematopoietic cells were isolated from psoriatic patients with family history and healthy subjects, and differentiated into T cells in vitro in the thymic stromal co-culture system. These cells were further subjected to functional comparisons such as in vitro proliferation, secretion of cytokines such as IL-4, IL-8 and IFN-gamma, and inducing the production of C-myc, Bcl-xL, and Ki67 proteins in human keratinocytes.
RESULTS: While bone marrow-derived CD34(+) cells from both patients and healthy volunteers developed into mature T cells within weeks in the thymic environment in vitro, the differentiated T cells from psoriatic patients showed higher proliferation and stronger capacity to secret TH1 cytokines in response to streptococcal superantigen. The differentiated T cells from psoriatic patients, but not from normal controls, induced overexpression of C-myc and Ki67, but not Bcl-XL, in keratinocytes.
CONCLUSIONS: T cells differentiated from CD34(+) cells of psoriatic patients, but not normal controls, are functionally similar to psoriatic circulating T cells, suggesting that the dysfunctional activity of T cells in psoriatic patients can be traced back to the early development of haematopoietic cells.
OBJECTIVES: To test if T cells originated from haematopoietic progenitor cells in psoriasis patients display functional alternations similar to previously reported abnormalities of circulating T cells.
METHODS: Bone marrow CD34(+) haematopoietic cells were isolated from psoriatic patients with family history and healthy subjects, and differentiated into T cells in vitro in the thymic stromal co-culture system. These cells were further subjected to functional comparisons such as in vitro proliferation, secretion of cytokines such as IL-4, IL-8 and IFN-gamma, and inducing the production of C-myc, Bcl-xL, and Ki67 proteins in human keratinocytes.
RESULTS: While bone marrow-derived CD34(+) cells from both patients and healthy volunteers developed into mature T cells within weeks in the thymic environment in vitro, the differentiated T cells from psoriatic patients showed higher proliferation and stronger capacity to secret TH1 cytokines in response to streptococcal superantigen. The differentiated T cells from psoriatic patients, but not from normal controls, induced overexpression of C-myc and Ki67, but not Bcl-XL, in keratinocytes.
CONCLUSIONS: T cells differentiated from CD34(+) cells of psoriatic patients, but not normal controls, are functionally similar to psoriatic circulating T cells, suggesting that the dysfunctional activity of T cells in psoriatic patients can be traced back to the early development of haematopoietic cells.