A comparison of class II antigenicity of human tracheal allografts stored in cialit and in merthiolate

This report deals with some of the immunological aspects of the transplantation and preservation of human tracheal grafts. The immunological behavior of the transplanted graft depends largely on the interaction of the preservatives with the tissue proteins. Using monoclonal antibodies and the immunoperoxidase staining technique we have investigated the effect of Merthiolate, Cialit, formaldehyde/ Merthiolate, and formaldehyde/Cialit preservation techniques on monomorphic determinants of class II transplantation antigens in human tracheal allografts. Unpreserved grafts were found to express class II antigens. These antigens were totally destroyed after 7 days in formaldehyde and 42 days in Cialit and Merthiolate. Preservation in Cialit and Merthiolate showed a gradual disintegration of the histological structures. In contrast, buffered formaldehyde did not appear to alter the histological structure of the tracheal graft. Irrespective of the mode of preservation, the cartilaginous tissue appeared to persist virtually unaffected. No essential differences were observed between the immunological staining of tracheal grafts preserved in Cialit and Merthiolate.