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Mutant Gene-Targeted Immunotherapy Approach Developed


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This news release, issued by Johns Hopkins Medicine, describes a novel targeted immunotherapy approach. This new approach employs bispecific antibodies to treat cancer by eliciting a Tcell response against mutated p53. The researchers used the Highly Automated Macromolecular Crystallography (AMX) and Frontier Microfocusing Macromolecular Crystallography (FMX) beamlines to characterize the molecular structure of the proteins. AMX and FMX are beamlines at the National Synchrotron Light Source II (NSLS-II) a U.S. Department of Energy (DOE) Office of Science User Facility at Brookhaven National Laboratory. NSLS-II offers a comprehensive suite of life science research capabilities. Johns Hopkins media contacts: Amy Mone, 410-614-2915, [email protected], or Valerie Mehl, 410-614-2916, [email protected]. Brookhaven Lab media contacts: Cara Laasch, 631-344-8458, [email protected] or Peter Genzer, 631-344-3174, [email protected]. ....

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Bispecific antibodies targeting mutant RAS neoantigens


Diabodies see the unseeable
RAS oncogene mutations are common in various cancers, controlling their growth and survival. Targeting mutant RAS proteins with antibodies has been unsuccessful due to low surface expression, even when targeting mutant RAS peptides presented via HLA on the surface of cancer cells. Douglass
et al. used phage display to generate single-chain variable fragments (scFvs) specific for mutant RAS peptide-HLA complexes. The authors tested various bispecific, T cell–engaging antibody formulations, finding that single-chain diabodies (scDbs) combining the aforementioned scFv with an anti-CD3 scFv were able to induce T cell activation and subsequent killing of tumor cells expressing mutant RAS peptide-HLA complexes. This scDb approach opens the door for antibody-based therapies against mutant neoantigens expressed at very low levels on the surface of cancer cells. ....

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