Abstract
Anticancer therapy for solid tumors suffers from inadequate methods for the localized administration of cytotoxic agents. Fas ligand (FasL) has been reported to be cytotoxic to a variety of cells, including certain tumor cell lines. We therefore postulated that myoblasts could serve as non-transformed gene therapy vehicles for the continuous localized delivery of cytotoxic anticancer agents such as FasL. However, contrary to previous reports, fluorescence activated cell sorting (FACS) analyses revealed that both primary mouse and human myoblasts express Fas, the receptor for FasL. To avoid self-destruction and test the cytotoxic potential of myoblasts, the cells were isolated from mice deficient in Fas (lpr/lpr), the mouse counterpart of human autoimmune lymphoproliferative syndrome (ALPS). These primary mouse myoblasts were transduced with a retroviral vector encoding mouse FasL and expression of a biologically active and soluble form of the molecule was confirmed by the apoptotic demise of cocultured Fas-expressing Jurkat cells, the standard in the field. To test whether the lpr myoblasts expressing FasL could be used in anticancer therapy, human rhabdomyosarcoma derived cell lines were assayed for Fas and then tested in the ...Continue Reading
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