小鼠异体皮移植创面使用细胞毒性T淋巴细胞抗原4-Ig重组腺病毒载体对其免疫功能的影响

目的　在小鼠背部移植异体皮后局部使用细胞毒性T淋巴细胞抗原 4 Ig(CTLA4 Ig)重组腺病毒载体 ,观察其对机体免疫功能的影响。　方法　将 6 0只BALB/c小鼠随机分为手术对照(A)组、CTLA4 Ig转染 (B)组及正常对照 (C)组 ,每组 2 0只。A、B组小鼠制作 1 .5cm× 1.5cm创面 ,移植同创面大小的C57BL小鼠皮肤后 ,A组小鼠创面涂抹不含腺病毒的交联聚丙烯酸树脂 (卡波姆霜 )0 .1g;B组小鼠创面涂抹含腺病毒的卡波姆霜 0 .1g,病毒滴度 5× 1 0 9/L。C组小鼠不作任何处理。术后 1d分别向 3组小鼠腹腔内注射体积分数 1 0 %绵羊红细胞 (SRBC)1ml。术后 7、1 4、2 1、2 8d收集血清进行凝集试验 ,检测SRBC抗体的效价 ,同时取BALB/c、C57BL及昆明小鼠的脾淋巴细胞作混合淋巴细胞培养 (MLC),观察CTLA4 Ig对脾淋巴细胞的抗原识别特异性及再次应答的影响。结果3组小鼠抗SRBC抗体效价组间比较 ,差异无显著性意义 (P >0.0 5 )。术后 1 4d内与A组比较 ,B组小鼠脾淋巴细胞与对C57BL小鼠脾淋巴细胞表现出特异性低反应 (P <0.0 5);1 4d后 ,A、B组的再次应答达到或超过C组 (P >0.0 5 )。结论　局部使用CTLA4 Ig重组腺病毒不影响小鼠的体液免疫功能 ,但可能引起系统性的特异性细胞免疫耐受。

The influence of the application of cytotoxic lymphocyte antigen 4-Ig adenovirus on the bum wounds with alloskin grafting on the murine function

OBJECTIVE: To investigate the influence of local application of cytotoxic lymphocyte antigen 4-Ig (CTLA4-Ig) adenovirus on the burn wound with alloskin grafting upon the murine immune function. METHODS: Sixty BALB/c mice were randomly divided into A (operation control), B (CTLA4-Ig transfection) and C (normal control) groups, with 20 mice in each group. Skin wounds (full-thickness loss) sized 1.5 cm x 1.5 cm were created on the backs of mice in A and B groups. Then the skin grafts of the same size obtained from C57BL mice were grafted into the skin wounds. 0.1 g of cross-linking polyacrylic resin (carbomer cream) without adenovirus was daubed onto the wounds in A group, and the same amount of carbomer cream with adenovirus in titers of 5 x 10(9)/L was daubed onto the wounds in B group, while no treatment was given in C group. 1 ml of 10% SRBC (sheep red blood cell) was injected intraperitoneally to all the mice of the three groups on the 1st post injury day (PID). Splenocytes from BALB/c, C57BL and Kunming mice were harvested for mixed lymphocyte culture on 7, 14, 21 and 28 PIDs. Agglutination assay was used in the same time to detect the SRBC antibody titers. RESULTS: The reaction of murine splenocytes in B group to the donor (C57BL) splenocytes was suppressed in a specific way (P < 0.05) within 14 PIDs. There was no difference in the titers of anti-SRBC antibody among the 3 groups (P > 0.05). CONCLUSION: Local application of CTLA4-Ig recombinant adenovirus exhibited no influence on the murine humoral immunity, but might induce systemic and specific T cell tolerance in immunity system.