Prolonged survival of rats receiving kidney allografts perfused with concanavalin A.
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Biomedical subjects
Publications and source records attributed to D Steinmuller.
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A technique of interlamellar keratoplasty was employed to evaluate the influence of difference in histocompatibility on the results of corneal transplantation in highly inbred rats. The degree of corneal clarity and vascularity and the incidence of rejection of relatively conpatible ("weak") and incompatible ("strong") allografts were recorded blindly in recipients with normal and vascularized corneas and in recipients sensitized with donor tissue either before or after corneal grafting. In contrast to the well-known effects of histocompatibility on skin and organ allografts, there was no substantial effect whatsoever of histocompatibility on either the severity of corneal allograft reactions orthe incidence of rejection. Consequently, the results of this experimental investigation suggest that tissue typing may have little or no value in clinical keratoplasty.
The immunogenicity of an antigenic cell is a distinctly different property from its antigenic composition. Two clinical problems might well be beneficially affected by modifying the immunogenicity of cell membrane antigens: Can the immunogenicity of tumor-specific antigens on malignant cells be increased so that effective immunity to the tumor will lead to its destruction? Conversely, can the immunogenicity of histocompatibility antigens on grafted organs be minimized so that they will survive a foreign host? Evidence is accumulating to indicate that under certain conditions a tumor vaccine can be developed utilizing autochthonous tumor cells, removed from the host, chemically modified in vitro, and reinjected into the original host which will effectively, augment specific immunologic defenses against residual tumor cells. Similarly, the moderately immunosuppressed host will tolerate grafts after suitable immunogenic modification in vitro. Both approaches may have ready clinical application, even before the mechanisms have been worked.
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