| abstract |
Genetically engineered cells are provided which can serve as universal donor cells in such applications as reconstruction of vascular linings or the administration of therapeutic agents. The cells include a DNA sequence which is expressed by the cell and which codes for a protein having complement inhibitory activity and which provides protection against complement-based lysis, i.e. hyperacute rejection. In addition, the cell's natural genome is changed so that proteins encoded by the class I or class II major histocompatability complex genes do not appear on the cell's surface. In this way, attack by T-cells is avoided. Optionally the cells can include a self-destruction mechanism so that they can be removed from the host when no longer needed. |