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論文(リポジトリ) |
論文(リポジトリ)
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宮路, 智香子
概要:
Recent studies demonstrated that murine liver contained extrathymically differentiated T cells. These cells express inte
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rmediate (int) level of TCR (CD3) and IL-2Rβ chain. However, it has been unknown about the development of these int TCR cells without requirement of thymus. Here, we investigated how the int TCR cells were differentiated and proliferated. The int TCR cells but not the other peripheral T cells responded to exogenous IL-7 which supported TCR cell differentiation in thymus. Similar to the bone marrow (BM), the liver contained hematopoietic stem cells (c-kit^+Lin^-) which enabled to reconstitute T, B, macrophage and myeloid cells in irradiated SCID mice. In vitro, the hematopoietic stem cells in the liver did not differentiate into the int TCR cells either in the presence of fetal thymus or thymic stromal cells. However liver-derived stromal cells which could produce IL-7 and other cytokines, supported int TCR cell differentiation. On the other hand, those in BM did not develop the int TCR cells in any condition. Taken together, the int TCR cells in the liver are supposed to be developed in situ from the hematopoietic stem cells in the liver in association with some cytokines like IL-7.
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| 2.
論文(リポジトリ) |
論文(リポジトリ)
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羽生, 忠正
概要:
To study joint destruction and osteoporosis in patients with rheumatoid arthritis (RA), we investigated bone loss using
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histomorphometric analysis. We also examined the property of colony forming unit-fibroblastic (CFU-F) isolated from tibial bone marrow in rats with collagen-induced arthritis (CIA) and iliac bone marrow in human. Our findings showed decreases of parameters of bone formation and of the number of alkaline phosphatase-positive CFU-F during onset of arthritis. We speculated that reduced bone formation was the predominant mechanism of bone loss in the pathogenesis of RA. We also demonstrated that the lymphocytes in the joints of CIA comprised resident T cells that are extrathymically generated in situ. In vivo treatment with various monoclonal antibody, these γδT cells and CD 8 _<αα>^+ cells were associated with suppression of the disease, especially after its onset. On the other hand, in patients with RA, CD57^+T cells levels were elevated, especially high in joints and its adjacent bone marrow. CD57^+T cells contained higher proportions of CD ^4-^8- cells and γδT cells than CD57^-T cells. We suggested that CD57^+T cells with NK cell marker probably were a counterpart of extrathymic T cells in human and had unique immuno-suppressive functions. In rats with CIA, great increase in number of granulocytes were also observed before the onset of arthritis. From these results, we are performing the evaluation of these treatment which makes it possible to decrease the granulocytes or to increase the CD57^+T cells using previous analysis system of bone formation.
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| 3.
論文(リポジトリ) |
論文(リポジトリ)
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橋本, 誠雄
概要:
In a series of recent studies, extrathymic T cell differentiation in mice has been reported. These T cells may be more p
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rimitive than that of thymic origin. Since they carry self reactive forbidden clones, it could be benefical for elimenating their own atypical cells. They express IL-2Rβ similar to NK cells, containing CD4 or CD8 double negative cells. Their morphology is large granular lymphocyte (LGL). This study is to elucidate the possibility that CD56 positive T cells with a morphology of LGL are the counterpart of extrathymic T cells in human. CD56 positive T cells were abundant in the liver comparing in peripheral blood from same donor. The phenotype of T cells in the liver mononuclear cells (MNC), CD56 positive T cells had considerably higher proportion of TCR-γδ aquisition, and CD4, CD8 double negative population were also existed in one of the case who had high population of CD56 positive T cells. While CD56 positive cells were absent in the thymus. CD56 positive T cells were able to proliferate in serum-rich medium condition supplemented with IL-2. CD56 positive T cells were also harvested from bone marrow cells in a liquid culture without thymic environment. These results described above and similarities of the extrathymic T cells in mice, strongly indicate the possibility that CD56 positive T cells is a counterpart of extrathymic T cells in humans.
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