Abstract
Store-operated Ca2+ entry is a pathway that is remodelled in a variety of cancers, and altered expression of the components of store-operated Ca2+ entry is a feature of breast cancer cells of the basal molecular subtype. Studies of store-operated Ca2+ entry in breast cancer cells have used non-specific pharmacological inhibitors, complete depletion of intracellular Ca2+ stores and have mostly focused on MDA-MB-231 cells (a basal B breast cancer cell line). These studies compared the effects of the selective store-operated Ca2+ entry inhibitors Synta66 and YM58483 (also known as BTP2) on global cytosolic free Ca2+ ([Ca2+]CYT) changes induced by physiological stimuli in a different breast cancer basal cell line model, MDA-MB-468. The effects of these agents on proliferation as well as serum and epidermal growth factor (EGF) induced migration were also assessed. Activation with the purinergic receptor activator adenosine triphosphate, produced a sustained increase in [Ca2+]CYT that was entirely dependent on store-operated Ca2+ entry. The protease activated receptor 2 activator, trypsin, and EGF also produced Ca2+ influx that was sensitive to both Synta66 and YM58483. Serum-activated migration of MDA-MB-468 breast cancer cells was sensitive to both store-operated Ca2+ inhibitors. However, proliferation and EGF-activated migration was differentially affected by Synta66 and YM58483. These studies highlight the need to define the exact mechanisms of action of different store-operated calcium entry inhibitors and the impact of such differences in the control of tumour progression pathways.
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Abbreviations
- ATP:
-
Adenosine triphosphate
- CM:
-
Complete media
- CPA:
-
Cyclopiazonic acid
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- EGF:
-
Epidermal growth factor
- EGFR:
-
Epidermal growth factor receptor
- ER:
-
Endoplasmic reticulum
- FBS:
-
Foetal bovine serum
- IP3 :
-
Inositol 1,4,5-trisphosphate
- PAR2:
-
Protease-activated receptor 2
- PBS:
-
Phosphate-buffered saline
- PLC:
-
Phospholipase C
- SOCE:
-
Store-operated Ca2+ entry
- SRM:
-
Serum-reduced media
- STIM1:
-
Stromal interaction molecule 1
- STR:
-
Short tandem repeat
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Acknowledgements
This research was partially supported by the National Health and Medical Research Council (NHMRC; project Grant 1079672). G.R.M. is supported by the Mater Foundation. The Translational Research Institute is supported by a Grant from the Australian Government.
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GR.M. and S.J.R.-T. are associated with QUE Oncology Inc.
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Azimi, I., Bong, A.H., Poo, G.X.H. et al. Pharmacological inhibition of store-operated calcium entry in MDA-MB-468 basal A breast cancer cells: consequences on calcium signalling, cell migration and proliferation. Cell. Mol. Life Sci. 75, 4525–4537 (2018). https://doi.org/10.1007/s00018-018-2904-y
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DOI: https://doi.org/10.1007/s00018-018-2904-y