Effects of multi and selective targeted tyrosine kinase inhibitors on function and signaling of different bladder cancer cells - 25/08/18
, Friederike Kessel a, Pietro Di Fazio b, Rainer Hofmann a, Axel Hegele aBienvenue sur EM-consulte, la référence des professionnels de santé.
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| pages | 10 |
| Iconographies | 8 |
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Graphical abstract |
Highlights |
• | mRNA analysis of RTK-signaling, proliferation and apoptosis separate bladder cancer cells in epithelial and mesenchymal like clusters. |
• | The functional cell responses towards BGJ398 and TKI258 treatment are heterogeneous. |
• | BGJ398 and TKI258 have cell specific effects on signaling with respect to p21 and MAP-kinase pathway. |
• | Drug actions of BGJ398 and TKI258 may result in different therapeutic outcome depending on the genetic background of bladder cancer cells. |
Abstract |
Background |
Signaling of receptor tyrosine kinases (RTK) is dysregulated in various malignancies including bladder cancer. RTKs trigger pro-proliferative, anti-apoptotic and metastatic signaling pathways. Here, we assessed the effects of a selective tyrosine kinase inhibitor (TKI) (BGJ398) targeting fibroblast growth factor receptor (FGFR) and a pan-TKI (TKI258) targeting (FGFR), platelet derived growth factor receptor (PDGFR) and vascular endothelial growth factor receptor (VEGFR) in bladder cancer cells.
Methods |
Levels of mRNA transcripts were measured in nine human cell lines by quantitative RT-PCR. Cell function was assessed for viability, colony formation, migration, apoptosis and proliferation. Protein mediators of signal transduction were measured by Western-blot.
Results |
mRNA transcripts encoding RTK-related components, transcription factors, epithelial and mesenchymal transition (EMT) markers as well as cell cycle and apoptotic factors were determined in the cell lines. Principal component analysis ordered one epithelial-like cell cluster (5637, BFTC-905, MGHU4, RT112) and one mesenchymal-like cell cluster (T24, UMUC3, HU456, TCC-SUP). Cell response scores towards TKI258 and BGJ398 treatment were heterogeneous between cell lines and correlated with certain transcript levels. Analysis of signal transduction pathways revealed inhibition of fibroblast growth factor receptor (FGFR) signaling and induction of cell cycle dependent kinase (CDKN1A, p21) in epithelial-like cells differing in this regard from responses to mesenchymal-like cells that exhibited inhibition of mitogen-activated protein kinase (MAPK).
Conclusion |
RTK and EMT related transcript analysis separate bladder cancer cells in two clusters. Functional responses towards TKI258 and BGJ398 treatment of bladder Fcancer cells were heterogeneous with deviating effects on signaling and possibly different therapeutic outcome.
Le texte complet de cet article est disponible en PDF.Keywords : Bladder cancer, Tyrosine kinase inhibitor, Cell function, Signal transduction, Transcript analysis
Plan
Vol 106
P. 316-325 - octobre 2018 Retour au numéro
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