Synergistic Anticancer Activity of Topotecan— Cyclin-Dependent Kinase Inhibitor Combinations against Drug-Resistant Small Cell Lung Cancer (SCLC) Cell Lines — Oak Academic Publishing
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Synergistic Anticancer Activity of Topotecan— Cyclin-Dependent Kinase Inhibitor Combinations against Drug-Resistant Small Cell Lung Cancer (SCLC) Cell Lines
Ludwig Boltzmann Cluster of Translational Oncology, Vienna, Austria
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Ludwig Boltzmann Cluster of Translational Oncology, Vienna, Austria
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Ludwig Boltzmann Cluster of Translational Oncology, Vienna, Austria
,
Ludwig Boltzmann Cluster of Translational Oncology, Vienna, Austria.
1 Ludwig Boltzmann Cluster of Translational Oncology, Vienna, Austria
2 Ludwig Boltzmann Cluster of Translational Oncology, Vienna, Austria
3 Ludwig Boltzmann Cluster of Translational Oncology, Vienna, Austria
4 Ludwig Boltzmann Cluster of Translational Oncology, Vienna, Austria.
Extended - stage small cell lung cancer (SCLC) responds to platinum/vepeside-based first-line chemotherapy but relapses rapidly as drug-resistant tumor. Topotecan (TPT) is the single chemotherapeutic agent approved for second-line treatment of SCLC. However, the response to TPT is short-lived and novel treatment modalities need to be developed. Sequential treatment of cytotoxic drugs and inhibitors of cyclin-dependent kinases (CDKs) showed promising preclinical anticancer activity and, in the present work, combinations of TPT with CDK inhibitors olomoucine, roscovitine and CDK4I are shown to exhibit synergistic cytotoxic activity against SCLC cell lines. Highest activity was found against TPT-resistant NCI-H417 and DMS153 cell lines and moderate chemosensitizing effects against a primary SCLC cell line and sensitive GLC19 cells at levels of CDK inhibitors which exerted low toxicity. A combination of 0.6 μM TPT with 0.6 μM roscovitine, exhibiting no significant cytotoxicity as single agents, reduced viability of the TPT-resistant NCI-H417 line (IC50 > 10 μM) by 50%. In the TPT resistant cell lines olomoucine and roscovitine, targeting CDK1,2,5,7, were highly effective, whereas in the more sensitive cell lines CDK4I, inhibiting mainly CDK4/6, showed activity. In NCI-417 cells, preincubation with roscovitine for one day proved synergistic with TPT. Thus, in good accordance with previous findings, CDK inhibitors are able to convert SCLC cancer cells which are cell-cycle arrested by a blockade of topoisomerase I by TPT to apoptotic cells. Since nowadays several CDK inhibitors are at various phases of clinical testing their combination with TPT seems to constitute a promising approach to improve second-line chemotherapy in SCLC.
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