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P27

Thomsen-Friedenreich antigen CD176 as a new target of CAR-T cells and TRUCKs with inducible IL-12 expression to control multiple carcinomas

M Umland¹   L M Beermann¹   A C Dragon¹   A Bonifacius¹   P Kehler²   J Gellert²   T Lischke²   K Zimmermann¹   S B Riese¹   F Thol¹   B Maecker-Kolhoff¹   M Hudecek³   A Schambach¹   R Blasczyk¹   B Eiz-Vesper¹

1:Hannover Medical School;   2:Glycotope GmbH;   3:Universitätsklinikum Würzburg

Nearly 80% of carcinomas and leukemia are positive for glycan structures from the Thomsen-Friedenreich antigen family, one of whose members is CD176 (Galβ1-3GalNAcα1-R). Due to different modifications (e.g. sialylation), CD176 is not accessible for ligand binding on healthy cells. Thus, CD176 is a potential target for immunotherapy of multiple carcinomas, which is why we designed a CAR to direct T cells against the carbohydrate epitope. Moreover, to approach a current limitation of CAR-T cells mainly being inefficient in the microenvironment of solid tumors, we generated CD176 TRUCKs (“T cells redirected for universal cytokine-mediated killing”), which, additionally to the CAR, contain an inducible cassette for IL-12 expression (iIL-12) that is activated upon CAR signaling. Upon co-cultivation with CD176-positive cell lines derived from different carcinomas (e.g. lung, breast, pancreatic cancer), CD176 CAR-T cells and TRUCKs with iIL-12 were specifically activated and released pro-inflammatory cytokines (e.g. IFN-γ, TNF-α). Moreover, the engineered T cells secreted cytotoxic mediators (e.g. granzyme B, granulysin) and exhibited cytotoxicity towards different cancer cell lines shown by flow cytometry and confirmed by real-time impedance measurements (xCELLigence). Interestingly, CD176-specific TRUCKs with iIL-12 showed an even improved functionality compared to CD176 CAR-T cells. Our results demonstrate that engineered T cells targeting CD176 are a promising approach for the treatment of several different carcinomas with potentially absent “on-target/off-tumor” toxicities. Utilizing the TRUCK approach even enhanced the functionality of CD176 CAR-T cells and might enable the fight against solid tumors with heterogeneous microenvironments by recruitment and reprogramming of bystander immune cells.

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

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© 2021 Die Deutsche Gesellschaft für Gentherapie e.V.

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