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Updated: May 1, 2026
In Vitro and In Vivo Assessment of T, B and Myeloid Cells Suppressive Activity and Humoral Responses from Transplant Recipients
Published on: August 12, 2017
[Research on the suppressive effect on transplantation rejection by indoleamine 2, 3-dioxygenase]
Chuan Li1, Xiangchen Dai1, Tong Liu1
1Department of General Surgery, Tianjin Medical University General Hospital, Tianjin 300052, China.
Objective:
To study the suppressive effect of indoleamine 2, 3-dioxygenase on transplantation rejection in mice heterotopic cardiac transplantation.
Methods:
Adenovirus vector containing IDO gene was used to infect donor (C57BL/6) DC to obtain IDO(+)DC. Mouse heterotopic cardiac transplantation models were established (C57BL/6-BALB/c) and the following groups were set up, including the control group, DC injection group, TC injection group, IDO(+)DC injection group and co-injection group of IDO(+)DC and TC, 12 donors and 12 recipients in each group.Survival time of the donor heart in every group was observed. Meanwhile, donor hearts were harvested 7 days post transplantation for different examinations, including pathological examination, mRNA expression of IDO through real-time PCR, IDO protein expression through Western blot. Peripheral blood of recipients was also harvested for CD3(+)T lymphocyte apoptosis rate examination through fluorescence-activated cell sorting.One-way ANOVA and Kaplan-Meier Survival Analysis were used for statistic analysis of IDO expression, CD3(+)T lymphocyte apoptosis rate and survival time of the donor heart respectively.
Results:
Cadiac allograft median survival time of each group were 7.0, 7.5, 11.0, 17.5, 24.0 days respectively. Compared with control and DC injection group, IDO(+)DC, TC and co-injection group significantly prolonged the survival time of donor hearts (t = 3.523-8.449, P < 0.01). Both IDO mRNA and protein expression showed significant increase(t = 5.974-16.176, P < 0.01). The CD3(+)T lymphocyte apoptosis rate was also significantly increased (t = 6.324-38.120, P < 0.01). Compared with IDO(+)DC or TC group alone, co-injection group significantly prolonged the survival time of the donor heart (t = 5.971 and 2.831, P < 0.05). Both IDO mRNA and protein expression showed significant increase (t = 2.853-15.194, P < 0.01).Furthermore, the CD3(+)T lymphocyte apoptosis rate was significantly increased as well (t = 26.069 and 7.643, P < 0.05).
Conclusions:
Suppressive effect of co-injection of IDO(+)DC and TC is much more effective than administration of IDO(+)DC or TC alone, which suggests that IDO achieved immune suppressive effect through the pathway of tryptophan depletion and accumulation of TC.
