Combined gemcitabine and CHK1 inhibitor treatment induces apoptosis resistance in cancer stem cell-like cells enriched with tumor spheroids from a non-small cell lung cancer cell line
Douglas D. Fang , Joan Cao , Jitesh P. Jani , Konstantinos Tsaparikos , Alessandra Blasina , Jill Kornmann , Maruja E. Lira , Jianying Wang , Zuzana Jirout , Justin Bingham , Zhou Zhu , Yin Gu , Gerrit Los , Zdenek Hostomsky , Todd VanArsdale
Front. Med. ›› 2013, Vol. 7 ›› Issue (4) : 462 -476.
Combined gemcitabine and CHK1 inhibitor treatment induces apoptosis resistance in cancer stem cell-like cells enriched with tumor spheroids from a non-small cell lung cancer cell line
Evaluating the effects of novel drugs on appropriate tumor models has become crucial for developing more effective therapies that target highly tumorigenic and drug-resistant cancer stem cell (CSC) populations. In this study, we demonstrate that a subset of cancer cells with CSC properties may be enriched into tumor spheroids under stem cell conditions from a non-small cell lung cancer cell line. Treating these CSC-like cells with gemcitabine alone and a combination of gemcitabine and the novel CHK1 inhibitor PF-00477736 revealed that PF-00477736 enhances the anti-proliferative effect of gemcitabine against both the parental and the CSC-like cell populations. However, the CSC-like cells exhibited resistance to gemcitabine-induced apoptosis. Collectively, the spheroid-forming CSC-like cells may serve as a model system for understanding the mechanism underlying the drug resistance of CSCs and for guiding the development of better therapies that can inhibit tumor growth and eradicate CSCs.
drug resistance / cancer stem cell / checkpoint kinase 1 (CHK1) / PF-00477736 / lung cancer / tumorigenicity
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Higher Education Press and Springer-Verlag Berlin Heidelberg
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