ArticlePloS one2026
A Transgenic mouse tolerant to syngeneic cancer cells expressing truncated human epidermal growth factor receptor.
Article in PloS one, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Epidermal Growth Factor Receptor (EGFR) is often present on the cell surface of a wide variety human malignancies, including non-small-cell lung cancer (NSCLC), glioblastoma (GBM), pancreatic ductal carcinoma (PDC), and castration-resistant prostate cancer (CRPC). Efforts to optimize immunotherapies targeting EGFR are limited by murine intolerance of human EGFR. To overcome this obstacle, we developed C57BL/6 mice in which a truncated variant of human EGFR (hEGFRt), lacking the ligand binding domain and cytoplasmic domain, is expressed from the CAG regulatory elements comprised of the CMV enhancer, β-actin promoter, and β-globin poly-adenylation signals. Cetuximab, a high-affinity, clinically available anti-human EGFR antibody, retains affinity for hEGFRt. The hEGFRt cDNA in the CAG-hEGFRt transgene is flanked by loxP sites to enable its excision thereby reducing interaction of hEGFRt-directed immunotherapies with normal tissues. The CAG-hEGFRt(f/f) transgene is abundantly expressed in hematopoietic lymphoid and myeloid cells, with low-level expression evident also in non-hematopoietic liver, lung, kidney, and brain. Mx1-Cre-mediated transgene excision in adult mice reduces hEGFRt ~ 5-fold in blood mononuclear cells. CAG-hEGFRt(f/f) adult mice are tolerant of syngeneic NSCLC, GBM, prostate, and PDC lines expressing hEGFRt. These mice retain hEGFRt tolerance after transgene deletion. CAG-hEGFRt(f/f) mice provide a new and important tool for the development of immunotherapies targeting hEGFR.
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