Strich 2023 MiPschool Obergurgl
Link: MiPschool Obergurgl 2023
Strich Sophie (2023)
Event: MiPschool Obergurgl 2023
Authors: Torres-Quesada Omar, Strich Sophie, Feichtner Andreas, Schwaighofer Selina, Doerrier Carolina, Schmitt Sabine, Gnaiger Erich, Stefan Eduard
Protein kinases play an important role in numerous signaling pathways regulating cell proliferation, cell cycle, and metabolism. Deregulation of kinase functions have been connected to various human diseases, such as cancer . In recent years, kinase inhibitors have gained recognition by aiming to block single or multiple oncogenic kinase pathways . In these lines, blockade of kinase activities has been shown to converge on the central energetic organelle, the mitochondria [3, 4]. Furthermore, colon cancer cells rely on mitochondrial OXPHOS as major source of energy, contradicting the Warburg effect .
To increase the understanding of small molecule-based kinase blockers and their cell-type-specific adverse effects, we set out to record the impact of kinase drugs on mitochondrial respiration using High-resolution FluoRespirometry in several colon cancer cell models. We observed that the impact of kinase inhibitors depends on the mutational background of the tested cancer cell lines as well as on cell culture medium formulations . First, we detected off-target effects of sunitinib, an FDA-approved multikinase blocker, only in a more physiological cell culture medium as compared with classical formulations. Second, mitochondrial profiling of the glycolytic kinase inhibitor PFK158 revealed off-target mitochondrial dysfunction. Third, we were able to show that inhibition of kinase signaling is connected to mitochondrial reactive oxygen species (ROS), which can be influenced by protein kinase modulators. In summary, cell-based mitochondrial bioenergetic profiles have the power to identify off-target effects of kinase inhibitors and allow a detailed mechanistic insight on drug-induced perturbations in cancer cell metabolism.
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• Keywords: kinase signaling, mitochondria, kinase inhibitors, cancer, drug off-target effects
• O2k-Network Lab: AT Innsbruck Oroboros
- Torres-Quesada Omar1,2, Strich Sophie2, Feichtner Andreas2,3, Schwaighofer Selina3, Doerrier Carolina4, Schmitt Sabine4, Gnaiger Erich4, Stefan Eduard2,3
- Division of Medical Biochemistry, Medical University of Innsbruck, Innrain 80/82, 6020 Innsbruck, Austria
- Tyrolean Cancer Research Institute (TKFI), Innrain 66, 6020 Innsbruck, Austria.
- Institute of Biochemistry and Center for Molecular Biosciences, University of Innsbruck, Innrain 80/82, 6020 Innsbruck, Austria
- Oroboros Instruments, Schoepfstrasse 18, 6020 Innsbruck, Austria
- Corresponding authorS: so[email protected]; [email protected]
Labels: Pathology: Cancer
HRR: Oxygraph-2k, O2k-Fluorometer Event: E2