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Effects of CD4(+)CD25(+) regulatory T cells on allogeneic hematopoietic stem cell transplantation in sensitized mice / 中国实验血液学杂志
Journal of Experimental Hematology ; (6): 464-469, 2014.
Article in Chinese | WPRIM | ID: wpr-349689
ABSTRACT
The aim of this study was to investigate the effects of CD4(+)CD25(+) regulatory T cells (Treg) on allogeneic hematopoietic stem cell transplantation (HSCT) in sensitized mice so as to provide experimental evidence for clinical treatment of allogeneic HSCT rejection in sensitized recipients. The BALB/c mice were divided into 5 groups group A - mice were sensitized with injection of splenocytes; group B - mice were sensitized with splenocytes and treated with >5×10(5) Treg on day 7 before transplantation; group C - mice were sensitized with splenocytes and treated with 5×10(5) Treg on day 13 and 7 before transplantation; group D - mice were not sensitized, but treated with equal volume of PBS as control; group E - blank control. Each group had 15 mice. On day 0 of transplantation, mice in each group were irradiated lethally with 8 Gy by linear accelerator, and the bone marrow cells of C57BL/6 labeled by fluorescence staining were intravenously injected via the tail vein. The fluorescent cells in peripheral blood and organ tissue were detected by flow cytometry on different time points for homing assessment. Survival rates and hematopoietic reconstitution were also recorded and monitored. The results showed that on 12 and 24 hours after transplantation, as compared with the sensitized group, the number of fluorescence homing cells in different tissue of the applied Treg groups increased significantly and the differences were statistically significant (P < 0.05). The mice in sensitized group and blank control group all died on the 6-13 day, whereas the median survival time of mice in applied Treg once and twice were 15 days and 16 days respectively. Comparing with sensitized group, the difference was statistically significant (P < 0.001), but there was no significant difference between these two groups applied regulatory T cell (P > 0.05). It is concluded that applying Treg can induce immune tolerance of sensitized recipient to allogeneic HSCT and inhibit immune destruction and prolong the survival time, but can not induce full immune tolerance and at last sensitized mice died of rejection of hematopoietic stem cells.
Subject(s)
Full text: Available Index: WPRIM (Western Pacific) Main subject: Transplantation, Homologous / T-Lymphocytes, Regulatory / Hematopoietic Stem Cell Transplantation / Allergy and Immunology / Graft vs Host Disease / Immune Tolerance / Methods / Mice, Inbred BALB C / Mice, Inbred C57BL Limits: Animals Language: Chinese Journal: Journal of Experimental Hematology Year: 2014 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Transplantation, Homologous / T-Lymphocytes, Regulatory / Hematopoietic Stem Cell Transplantation / Allergy and Immunology / Graft vs Host Disease / Immune Tolerance / Methods / Mice, Inbred BALB C / Mice, Inbred C57BL Limits: Animals Language: Chinese Journal: Journal of Experimental Hematology Year: 2014 Type: Article