Tepotinib is a novel tyrosine kinase inhibitor recently approved for the treatment of non-small cell lung cancer (NSCLC). In this study, we evaluated the tepotinib's potential to perpetrate pharmacokinetic drug interactions and modulate multidrug resistance (MDR). Accumulation studies showed that tepotinib potently inhibits ABCB1 and ABCG2 efflux transporters, which was confirmed by molecular docking. In addition, tepotinib inhibited several recombinant cytochrome P450 (CYP) isoforms with varying potency. In subsequent drug combination experiments, tepotinib synergistically reversed daunorubicin and mitoxantrone resistance in cells with ABCB1 and ABCG2 overexpression, respectively. Remarkably, MDR-modulatory properties were confirmed in ex vivo explants derived from NSCLC patients. Furthermore, we demonstrated that anticancer effect of tepotinib is not influenced by the presence of ABC transporters associated with MDR, although monolayer transport assays designated it as ABCB1 substrate. Finally, tested drug was observed to have negligible effect on the expression of clinically relevant drug efflux transporters and CYP enzymes. In conclusion, our findings provide complex overview on the tepotinib's drug interaction profile and suggest a promising novel therapeutic strategy for future clinical investigations.

• Klíčová slova
• ABC transporter, cytochrome P450, drug interaction, multidrug resistance, non-small cell lung cancer, tepotinib,
• MeSH
• ABC transportéry antagonisté a inhibitory   MeSH
• chemorezistence účinky léků   MeSH
• cytostatické látky farmakologie   MeSH
• lékové interakce * MeSH
• lidé MeSH
• mnohočetná léková rezistence účinky léků   MeSH
• nádory plic farmakoterapie   metabolismus   patologie   MeSH
• nemalobuněčný karcinom plic farmakoterapie   metabolismus   patologie   MeSH
• piperidiny farmakologie   MeSH
• protinádorové látky farmakologie   MeSH
• pyridaziny farmakologie   MeSH
• pyrimidiny farmakologie   MeSH
• techniky in vitro MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• ABC transportéry MeSH
• cytostatické látky MeSH
• piperidiny MeSH
• protinádorové látky MeSH
• pyridaziny MeSH
• pyrimidiny MeSH
• tepotinib MeSH Prohlížeč

The primary cilium is considered as a key component of morphological cellular stability. However, cancer cells are notorious for lacking primary cilia in most cases, depending upon the tumour type. Previous reports have shown the effect of starvation and cytostatics on ciliogenesis in normal and cancer cells although with limited success, especially when concerning the latter. In this study, we evaluated the presence and frequency of primary cilia in breast fibroblasts and in triple-negative breast cancer cells after treatment with cytostatics finding that, in the case of breast fibroblasts, primary cilia were detected at their highest incidence 72 hours after treatment with 120 nM doxorubicin. Further, multiciliated cells were also detected after treatment with 80 nM doxorubicin. On the other hand, treatment with taxol increased the number of ciliated cells only at low concentrations (1.25 and 3.25 nM) and did not induce multiciliation. Interestingly, triple-negative breast cancer cells did not present primary cilia after treatment with either doxorubicin or taxol. This is the first study reporting the presence of multiple primary cilia in breast fibroblasts induced by doxorubicin. However, the null effect of these cytostatics on primary cilia incidence in the evaluated triple negative breast carcinomas cell lines requires further research.

• Klíčová slova
• doxorubicin, multiple cilia, primary cilium, triple-negative breast cancer,
• MeSH
• cilie účinky léků   metabolismus   MeSH
• cytostatické látky toxicita   MeSH
• doxorubicin farmakologie   MeSH
• fibroblasty účinky léků   metabolismus   MeSH
• lidé MeSH
• nádorové buněčné linie MeSH
• paclitaxel farmakologie   MeSH
• proliferace buněk účinky léků   MeSH
• viabilita buněk účinky léků   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• cytostatické látky MeSH
• doxorubicin MeSH
• paclitaxel MeSH