目的 利用脆弱拟杆菌来源的基因重组α-半乳糖苷酶清除猪皮细胞及基质的异种抗原(α-Gal抗原) ,降低猪皮基质敷料的免疫原性. 方法 2月龄健康无皮肤疾患的猪皮皮片,经剖层裁切成不同的规格后,分别经碘酊和75%乙醇溶液浸泡消毒,随后用PBS清洗后进行酶解条件的摸索;采用免疫荧光法检测猪皮的α-Gal抗原,双抗夹心ELISA法检测残留酶,通过对酶解猪皮的残留酶和α-Gal抗原的检测进而优化、改进酶解条件和洗涤条件,以确立最佳酶解工艺. 结果 建立了有效的酶解方法和洗涤方法,酶解后猪皮的α-Gal抗原清除率>90%,残留酶不能检出(间接ELISA法检测微量α-半乳糖苷酶的下限为1 ng/ml). 结论 所建立的酶解工艺和洗涤工艺可有效清除猪皮细胞及基质的α-Gal抗原,建立了制备低免疫原性猪皮敷料的方法.%Objective To reduce immunogenicity of porcine skin by removingα-Gal epitopes expressed in cell surface and extracellular matrix using recombinant α-galactosidase produced by Bacteroides fragilis.Methods The porcine skin was harvested from healthy 2-month-old pigs without any skin disorders before being sterilized by iodine and 75%alcohol, respectively.Enzymatic removal of α-Gal antigen was followed by washing with PBS.The α-Gal antigen in the prepared porcine skin was measured with immunofluorostaining of cryosections and the residual enzyme was measured with a double-antibody sandwich ELISA method.Enzymatic removal procedures were optimized by detecting residual enzyme and the effi-cacy ofα-Gal removal under different enzymatic and washing conditions.Results Efficient enzymatic and washing methods were established to removeα-Gal antigen.Theα-Gal removal efficacy was above 90% and residual enzyme was undetect-able (αprescribed minimum ofα-galactosidase detection with indirect ELISA was 1 ng/ml) .Conclusion It is feasible to efficiently removeα-Gal antigen under these enzymatic and washing conditions, and a method of producing low-immunoge-nicity pig skin dressing for burn is established.
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