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表達IDO的Kupffer細胞對小鼠移植皮片存活的影響

摘要:目的:探討表達吲哚胺2,3二氧化酶(IDO)的KC對同種異體小鼠移植皮片存活時間的影響及其機制。方法:構建BABL/c →C57BL/6的皮膚移植模型,分別于移植術后第2、7、14天輸注KC,于移植術后第7天每組各取2只皮瓣行HE染色和TUNEL以檢測淋巴細胞浸潤和凋亡情況。KaplanMeier對數秩檢驗對各組進行生存分析。結果:輸入表達IDO和FasL的KC能明顯延長BABL/c →C57BL/6皮膚移植模型中皮膚移植物的存活時間,1－甲基色氨酸能阻斷此效應。IFNγ組皮瓣浸潤淋巴細胞的凋亡率較高(Plt;0.05)。結論:表達IDO和FasL的KC在體內能明顯延長同種異體小鼠皮片的存活時間,IDO在KC維持外周免疫耐受中發揮重要作用。Abstract: Objective: To investigate kupffer cells(KC) expressing indoleamine 2,3dioxygenase(IDO) on the survival of grafted skin in mouse and its underlying mechanism. Methods: BABL/c skin was transplanted to C57BL/6. Donor KC were injected i.v. at days 2,7, 14 before transplantation. HE and TUNELAP were used to identify infiltrating cells and apoptotic cells in section of skin allografts from 7 days posttransplantation respectively. The survival rate of recipients among groups were analyzed by Logrank test. Results: Injection of KC expressing IDO and FasL from BABL/c mice into C57BL/6 could prolong a skin graft survival from the donor, but 1methyltryptophan could block the effect in vivo. The apoptosis rate of lymphocyte among skin graft in IFNγ group is more than other group(Plt;0.05). Conclusion: IDO and FasLexpressing KC from the donor of mouse can significantly prolong the skin graft survival. IDO may play an important role in KC to induce immune tolerance.