1. Dual ON/OFF-switch chimeric antigen receptor controlled by two clinically approved drugs.
- Author
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Giordano Attianese GMP, Shui S, Cribioli E, Triboulet M, Scheller L, Hafezi M, Reichenbach P, Gainza P, Georgeon S, Correia BE, and Irving M
- Subjects
- Humans, Animals, Mice, Cell Line, Tumor, Antineoplastic Agents pharmacology, Immunotherapy, Adoptive methods, Proto-Oncogene Proteins c-bcl-2 metabolism, Xenograft Model Antitumor Assays, Receptors, Antigen, T-Cell metabolism, Receptors, Antigen, T-Cell immunology, Lymphocyte Activation drug effects, Interferon-gamma metabolism, Interferon-gamma immunology, Aniline Compounds, Receptors, Chimeric Antigen immunology, Receptors, Chimeric Antigen metabolism, Sulfonamides pharmacology, T-Lymphocytes immunology, T-Lymphocytes drug effects, Bridged Bicyclo Compounds, Heterocyclic pharmacology
- Abstract
The ability to remotely control the activity of chimeric antigen receptors (CARs) with small molecules can improve the safety and efficacy of gene-modified T cells. Split ON- or OFF-switch CARs involve the dissociation of tumor-antigen binding from T cell activation (i.e., CD3ζ) on the receptor (R-) and signaling (S-) chains, respectively, that either associate or are disrupted in the presence of a small molecule. Here, we have developed an inducible (i)ON-CAR comprising the anti-apoptotic B cell lymphoma protein 2 protein in the ectodomain of both chains which associate in the presence of venetoclax. We showed that inducible ON (iON)-CAR T cells respond to target tumors cells in the presence of venetoclax or the BH3 mimetic navitoclax in a dose-dependent manner, while there is no impact of the drugs on equivalent second generation-CAR T cells. Within 48 h of venetoclax withdrawal, iON-CAR T cells lose the ability to respond to target tumor cells in vitro as evaluated by Interferon-gamma (IFNγ) production, and they are reliant upon the presence of venetoclax for in vivo activity. Finally, by fusing a degron sequence to the endodomain of the iON-CAR S-chain we generated an all-in-one ON/OFF-switch CAR, the iONØ-CAR, down-regulated by lenalidomide within 4 to 6 for functionally inactive T cells (no IFNγ production) within 24 h. We propose that our remote-control CAR designs can reduce toxicity in the clinic. Moreover, the periodic rest of iON and iONØ-CAR T cells may alleviate exhaustion and hence augment persistence and long-term tumor control in patients., Competing Interests: Competing interests statement:Provisional intellectual property filing has been filed for iON and iONØ CAR designs with inventors including G.M.P.G.A., B.E.C., SS., and M.I.
- Published
- 2024
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