Sensitivity of adagrasib in spheroids of KRAS wild-type and

KRAS G12C mutant cell line

  • In vitro 3D spheroids more closely mimic important features of solid tumors compared to 2D monolayer cultures.

  • These features include cell-cell interactions, morphology, degree of proliferation, diffusion of nutrients and oxygen, and gene expression profiles [1-3].

  • Spheroid cultures, therefore, provide an attractive model for anti-cancer drug screening in a complex cellular environment.

  • The small molecule inhibitor adagrasib (MRTX849), which selectively and irreversibly targets KRAS G12C, was evaluated in spheroids of a KRAS wild-type and a KRAS G12C mutant cell line.

  • A concentration-dependent decrease in spheroid diameter was observed for the KRAS G12C mutant cell line, whereas no visual decreases were observed for the KRAS wild-type cell line.

  • For quantitative evaluation of cell viability in these spheroids, an ATP-monitoring luminescence assay was used.

  • In cell viability assays, spheroids of KRAS G12C mutant cell line showed sensitivity to adagrasib, whereas the KRAS wild-type cell line remained unaffected.

3D spheroid morphology of KRAS wild-type U-87 MG cells and MIA PaCa-2 cells, exposed to a dilution series of adagrasib.
Dose-response curves of adagrasib in viability assays with the KRAS wild-type cell line U-87 MG and KRAS G12C mutant cell line MIA PaCa-2 in 3D culture.

References

1. Djordjevic et al. (2006) Cell-cell interactions in spheroids maintained in suspension. Acta Oncologica 45(4), 412-420.

2. Lama et al. (2013) Development, validation and pilot screening of an in vitro multi-cellular three-dimensional cancer spheroid assay for anti-cancer drug testing. Bioorganic & Medicinal Chemistry 21(4), 922-931.

3. Hamer et al. (2008) The genomic profile of human malignant glioma is altered early in primary cell culture and preserved in spheroids. Oncogene 27(14), 2091-2096.