On May 9, 2024 Cimeio Therapeutics, a biotechnology company leading the field of epitope shielding, reported data for its CD52 program during this week’s Annual Meeting of the American Society of Cell & Gene Therapy (ASGCT) (Free ASGCT Whitepaper) in Baltimore (Press release, Cimeio Therapeutics, MAY 9, 2024, View Source [SID1234642983]). The abstract is titled "Molecular Shielding of CD52 Retains Expression, Anti-Phagocytic Don’t Eat Me Function and Protects from Alemtuzumab-Mediated Depletion."
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The study is the first showing that T cells expressing an engineered CD52 can be effectively shielded from Alemtuzumab-mediated depletion, while maintaining the general features of this receptor. Cimeio’s research team also showed for the first time that CD52 mediates an anti-phagocytotic ‘Don’t Eat Me’ signal, which is retained by the engineering. This program can serve as the basis for a novel approach to treating patients with T cell malignancies, non-genotoxic conditioning, and aiding in improving the persistence of allogeneic CAR T cells.
"Exhaustive screening as well as comprehensive expression, glycan and functional analyses allowed us to identify a base editable point mutation that protected T cells from Alemtuzumab, while allowing CD52 to maintain its cell surface expression, processing and function," said Stefanie Urlinger, Ph.D., Chief Scientific Officer at Cimeio. "We are excited to explore the full potential of our engineered CD52 receptor in the future. This can represent a viable alternative to CD52 knock-out on allogeneic CAR T cells, mediating resistance to lymphodepletion using Alemtuzumab and perhaps also contributing to a prolonged in vivo persistence."