ICaspase 9 Suicide Gene System
Overview
Affiliations
Although cellular therapies may be effective in cancer treatment, their potential for expansion, damage of normal organs, and malignant transformation is a source of concern. The ability to conditionally eliminate aberrant cells in vivo would ameliorate these concerns and broaden the application of cellular therapy. We devised an inducible T-cell safety switch that can be stably and efficiently expressed in human T cells without impairing phenotype, function, or antigen specificity. This system is based on the fusion of human caspase 9 to a modified human FK-binding protein, allowing conditional dimerization using a small-molecule drug. When exposed to a synthetic dimerizing drug, the inducible caspase 9 (iC9) becomes activated and leads to the rapid apoptosis of cells expressing this construct. We have demonstrated the clinical feasibility and efficacy of this approach after haploidentical hematopoietic stem cell transplant (haplo-HSCT). A single dose of a small-molecule drug (AP1903) eliminated more than 90 % of the modified T cells within 30 min after administration and symptoms resolved without recurrence. This system has the potential to broaden the clinical applications of cellular therapy.
Clinical progress in the development of CAR T cells to treat malignant glioma.
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PMID: 39605384 PMC: 11601352. DOI: 10.1101/2024.11.13.623476.
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PMID: 39560995 PMC: 11735097. DOI: 10.1172/JCI181143.
Synthetic Cells and Molecules in Cellular Immunotherapy.
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PMID: 38904025 PMC: 11186374. DOI: 10.7150/ijbs.94346.
Chimeric Antigen Receptor (CAR)-T Cell Therapy for Non-Hodgkin's Lymphoma.
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PMID: 38550613 PMC: 10972674. DOI: 10.20411/pai.v9i1.647.