Abstract
Autotaxin (ATX) promotes cancer cell survival, growth, migration, invasion and metastasis. ATX converts extracellular lysophosphatidylcholine (LPC) into lysophosphatidate (LPA). As these lipids have been reported to affect cell signaling through their own G-protein-coupled receptors, ATX could modify the balance of this signaling. Also, ATX affects cell adhesion independently of its catalytic activity. We investigated the interactions of ATX, LPC and LPA on the apoptotic effects of Taxol, which is commonly used in breast cancer treatment. LPC had no significant effect on Taxol-induced apoptosis in MCF-7 breast cancer cells, which do not secrete significant ATX. Addition of incubation medium from MDA-MB-435 melanoma cells, which secrete ATX, or recombinat ATX enabled LPC to inhibit Taxol-induced apoptosis of MCF-7 cells. Inhibiting ATX activity blocked this protection against apoptosis. We conclude that LPC has no significant effect in protecting MCF-7 cells against Taxol treatment unless it is converted to LPA by ATX. LPA strongly antagonized Taxol-induced apoptosis through stimulating phosphatidylinositol 3-kinase and inhibiting ceramide formation. LPA also partially reversed the Taxol-induced arrest in the G2/M phase of the cell cycle. Our results support the hypothesis that therapeutic inhibition of ATX activity could improve the efficacy of Taxol as a chemotherapeutic agent for cancer treatment.
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Abbreviations
- ATX:
-
autotaxin
- DAPI:
-
4,6-diamidino-2-phenylindole
- FBS:
-
fetal bovine serum
- LPA:
-
lysophosphatidate
- LPC:
-
lysophosphatidylcholine
- MAPK:
-
mitogen-activated protein kinase
- PI3K:
-
phosphatidylinositol 3-kinase
- TMRE:
-
tetramethlyrhodamine ethyl ester
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Acknowledgements
We thank Mr M Czernick and Mr J Dewald for excellent technical support in the fluorescence-activated cell sorting analysis and preparing labeled LPA, respectively. We thank Dr M Sawyer for help with the isobologram analysis, Dr E Posse de Chaves for advice on DAPI staining and Drs F Bamforth and GS Cembrowski for their support. We thank Dr T Clair for providing recombinant ATX and the ATX antibody. Drs KR Lynch and TL Macdonald donated the VPC8a202 and VPC51299 and Dr JA Boutin gave us S32826. DNB is a Medical Scientist of the Alberta Heritage Foundation for Medical Research. ISG is a recipient of a Recruitment Award from the Alberta Cancer Board/Alberta Cancer Foundation. NS is a recipient of scholarships from Iranian Ministry of Health and the Bell McLeod Educational Fund, University of Alberta. The work was supported by the Canadian Institutes of Health Research (MOP 81137).
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Samadi, N., Gaetano, C., Goping, I. et al. Autotaxin protects MCF-7 breast cancer and MDA-MB-435 melanoma cells against Taxol-induced apoptosis. Oncogene 28, 1028–1039 (2009). https://doi.org/10.1038/onc.2008.442
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DOI: https://doi.org/10.1038/onc.2008.442
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