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P53

rAAV displaying an anti-EGFR affibody transduces neuroendocrine tumor cell lines and organoids and mediates efficient enzyme prodrug tumor cell killing

C Rothschild-Gronau(1) T Hellberg(2) K Detjen(2) B Wiedenmann(2) K M Müller(1)

1:Cellular and Molecular Biotechnology, Bielefeld University; 2:Department of Hepatology and Gastroenterology, Charité University Medicine

Malignant tumors remain a leading cause of death and novel, specific, and effective therapies are urgently needed for several tumor types. Recombinant adeno-associated viruses (rAAV) provide well-characterized biological and structural features enabling tumor targeting at the capsid and at the genetic level. The epidermal growth factor receptor (EGFR) is a validated tumor marker addressed by several therapeutic antibodies. We explored the potential of rAAV for tumor therapy by rational insertion of a small antibody mimetic in the capsid and endowing them with a trans-gene encoding a prodrug-activating enzyme. The EGFR binding Affibody ZEGFR:1907 was genetically incorporated within the variable region IV (453-loop) of rAAV-VP2 of the serotypes AAV2 or AAV9. The respective mosaic rAAVs were produced successfully. We demonstrated EGFR-dependent binding and transduction in model cell lines (MCF7, HeLa, A431). Ultimately, patient derived neuroendocrine tumor cells were transduced and killed mediated by thymidine kinase expression and ganciclovir activation.

Sekretariat der DG-GT e.V.
Institut für Experimentelle Hämatologie
Hildegard Büning
Carl-Neuberg-Str. 1
30625 Hannover

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