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PROLONGED SURVIVAL OF XENOGRAFTS DESPITE SENSITIZATION

We have reported cell-mediated immunity to corneal protein antigens after corneal homotransplantation in man and after xenografts in animals. Patients were followed weekly with the Leucocyte Migration inhibition (LMI) Test. Similar results were obtained in animals by direct and indirect MIF production.When rabbit embryonic cartilage is placed around a guinea pig corneal transplant into a rabbit's eye, sensitization occurs as shown previously. The xenograft is rejected in the second week if no cartilage is added, or if it is surrounded by silicon strips. It is rejected in the third week when rabbit adult cartilage is used and not rejected for 4-7 weeks with embryonic cartilage implantation. Embryonic cartilage produces factors that inhibit neovascularization.The experiments suggest that senaitization occurs in each instance but that expression of the efferent arc of the immune response is delayed by the inhibition of graft vascularization by the embryonic cartilage.