Abstract
Purpose
To investigate the combination of conventional cytotoxic anticancer agents and a small molecule kinase inhibitor in preclinical models of non-small-cell lung cancer (NSCLC).
Methods
We compared the induction of apoptosis by DNA-damaging anticancer drugs and PKC412, a predominantly protein kinase C (PKC)-specific small molecule inhibitor, in six NSCLC cell lines of different histologic and genetic backgrounds. The outcome of various combinations and schedules of DNA-damaging agents and PKC412 was studied, and isobolograms were calculated. Conditional expression of pro-apoptotic BAK was applied to specifically target apoptotic signal transduction in combination with drug therapy.
Results
Resistance of NSCLC cells to DNA damage–induced apoptosis was mainly determined at the mitochondrial step of the intrinsic pathway of caspase activation. PKC412 effectively inhibited the growth factor signal transduction, but failed to induce apoptosis in NSCLC cells resistant to DNA-damaging agents. Combining conventional anticancer drugs with PKC412 at different doses and schedules resulted in unpredictable outcomes, including synergistic, additive, and antagonistic interactions. In contrast, conditional expression of BAK reliably sensitized drug-resistant NSCLC cells to apoptosis induced by cytotoxic agents or PKC412.
Conclusions
Combining DNA-damaging anticancer drugs with a pharmacologic inhibitor of growth and survival factor signaling in NSCLC may result in unpredictable treatment outcomes. In contrast, targeting specific death effector mechanisms, such as apoptotic signal transduction, is a promising strategy to sensitize NSCLC to cytotoxic agents or kinase inhibitors.
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Acknowledgments
This work contains parts of a Medical Doctoral Thesis by Melanie Guyot. Drs. Thomas Meyer, Özlem Türeci, Wolfgang Hillen, Gary Nolan, and Gerard Evan are thanked for providing reagents. This work was supported by the Deutsche Forschungsgemeinschaft (SCHU1541/5-1), Deutsche Krebshilfe (107993), and Wilhelm Sander-Stiftung (2005.136.3).
Conflict of interest
Martin Schuler and Frank Breitenbuecher have received research funding from Novartis. Martin Schuler has served as a compensated consultant to Novartis.
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432_2012_1220_MOESM1_ESM.eps
Clonogenic survival of NSCLC cells following treatment with PKC412, etoposide, or combinations of both drugs. Note that etoposide treatment at a concentration of 6.25 μM completely prevented the clonogenic survival of NCI-H460 cells, whereas cotreatment with etoposide (6.2 μM) and PKC412 (50 μM) produced some clones (upper panel). A similar pattern emerged in A549 cells, which exhibited an increased clonogenic survival following cotreatment with etoposide (6.25 μM) plus PKC412 (50 μM) as compared to monotherapy with etoposide (lower panel) (EPS 15180 kb)
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Meiler, J., Guyot, M., Hoffarth, S. et al. Individual dose and scheduling determine the efficacy of combining cytotoxic anticancer agents with a kinase inhibitor in non-small-cell lung cancer. J Cancer Res Clin Oncol 138, 1385–1394 (2012). https://doi.org/10.1007/s00432-012-1220-4
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DOI: https://doi.org/10.1007/s00432-012-1220-4