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Improved β-thalassemia treatment using protected blood stem cell transplant with toxin-free preparation and natural selection inside the body

Updated

Abstract

A new CD117-blocking monoclonal antibody (CIM058) has shown potency in blocking wild-type hematopoietic stem and progenitor cells (HSPCs).

  • Ex vivo gene therapy and genome engineering of HSPCs could provide one-time cures for certain conditions.
  • Toxic conditioning, particularly the use of busulfan, presents a significant safety concern for hematopoietic stem cell transplantation.
  • CIM058 was generated to specifically block CD117, a target previously identified as promising for antigen-specific therapy.
  • Combining CIM058 with engineered CD34+ HSPCs resistant to this antibody improved disease outcomes in a beta-thalassemia model.
  • This approach may reduce the need for myeloablative conditioning regimens, potentially lowering associated morbidities.

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Funding

Competing interests

Funding: Research was supported by the European Research Council (L.T.J.). Sponsored research agreement with Cimeio Therapeutics AG (Cimeio) (L.T.J. and T.I.C.). Decision to publish was the sole responsibility of L.T.J. L.T.J.’s employer, the Basel University Hospital, receives financial compensation for L.T.J.’s consulting. Employment: Ridgeline Discovery GmbH: A. S., A. W., L.C.W. Employment: Cimeio Therapeutics: A. C., E-M. G., E. TB., J. B., L. G. P., F. L., V. DS., C. D., S. Y., S. U. Cimeio co-founder: R.M., R.L., L.T.J. Personal financial interests: L.T.J.: co-founder, board member of Cimeio AG. Holding Cimeio equity: University of Basel, R.M., R.L., A. S., A. C., T. B., A. W., L.C.W., E-M. G., E. TB., J. B., L. G. P., F. L., V. DS., C. D., S. Y., S. U., L.T.J. Inventors on a patent application related to the findings reported here: R.M., R.L., A. S., A. C., A. W., L.C.W., E. TB., L. G. P., F. L., S. U., L.T.J. Hold a patent on CAST-Seq (US11319580B2): T.C. and G.A. D.R.L. is a co-founder of Beam Therapeutics, Prime Medicine, Pairwise Plants, Editas Medicine, and nChroma Bio, companies that use or deliver genome editing or epigenome-modifying agents.
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