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To obtain better arterio grafts, we prepared three samples from adventitia of swine carotid arteries, and their antigenicity was studied with immunological procedures. Sample I was prepared from swine carotid arteries, by eliminating the extraneous fat and connective tissues. Sample II was prepared from Sample I by treatment with chymotrypsin, and Sample III was prepared from Sample II by treatment with 3% glutaraldehyde for 14 days. From the three samples, the water soluble protein fractions were extracted, and abbreviated as E-I, E-II and E-III, respectively. Immunopharmacological tests in guinea pigs and rabbits including active and passive anaphylaxis, passive cutaneous anaphylaxis, Schultz-Dale test and Arthus's phenomenon among these extracts revealed cross reactions between E-I and E-II. Also, precipitin test and Ouchterlony's method, precipitation was observed between E-I and E-II, and it was suggested that there might be at least a common antigen between E-I and E-II. The rabbits which had been implanted subcutaneously at the back with the minced Sample I evoked severe reactions and died after intravenous injection of E-I at the 3rd or 5th month after implantation. No reaction was observed between Sample III and E-III in the same experiment. From the above results, it was suggested that the antigenicity of swine carotid arteries could be eliminated by the treatment with chymotrypsin and glutaraldehyde.

Studies on the antigenicity of swine arterio graft