猕猴类人血型抗原B酶解的研究

Studied on enzymatical digestion of B-like antigen of cynomolgus monkey

目的:研究α半乳糖苷酶对猕猴类人血型抗原B的酶解,为制备人O型红细胞提供依据。方法:以重组的α半乳糖苷酶对猕猴类人血型抗原酶解B,观察红细胞酶解前后各项生化指标的变化及动物输血试验。结果:酶解后红细胞的形态、各项生化指标及功能正常。酶解红细胞回输后受体猕猴的血压、脉搏、呼吸与输血前相比无明显变化,酶解红细胞输血后体内的24小时存活率为96.5%和95.0%,半衰期均为16天,对照组红细胞在体内的24小时存活率为97.1%,半衰期为16天。受体猕猴的血液、尿液等主要生化指标与输血前相比无显著性差异(P>0.05)。结论:α半乳糖苷酶可以清除猕猴红细胞表面的类人B抗原,并且对猕猴红细胞的形态和功能无不良影响,酶解后红细胞输给同种异型受体不发生输血反应。提示人类ABO血型改造是可行的。

Objective：To study enzymatical digestion of human B-like antigen of cynomolgus monkey for providing basis of preparation of human type O red cells. Methods ：The B-like blood group antigen of eynomlgus monkey was digested by reeombined α-galactosidase and various biochemistry parameters were tested for pre- and post-digestion red cells and it was transfused to animal. Results ：The shape and various biochemistry parameters as weU as function of post-digestion were normal. The blood pressure, pulse and respiration of recipient monkeys had not distinctly charged post-transfusion compared with pre-transfusion. Viabilities within 24 h of digestion cells in vivo were 96.5% and 95.0% versus 97.1% in control,T1/2 were all 16 d versus 16 d in control. Components and concentration in recipient blood and urine did not show a significant change compared with eontrol（P 〉 0.05）. Conelusion：Human B-like antigen on eynomolgus monkey could be α-galaetosidase digested and it did not change the shape and function. There was no transfusion after human A-like eynomolgus monkeys received enzye-digestion huan B-like red cells, our results suggest that it may be possible to modify human ABO blood group.