Abstract
Epithelial-mesenchymal transition (EMT) is a key event preceding tumor cell metastasis that increases cell invasiveness and cancer stem cell (CSC) populations. Studies suggest that genes used in generating circadian rhythms also serve in regulating EMT. To test the role of circadian clocks in cellular EMT events two cancer cell lines were compared, one that has a well-established circadian clock, C6 from rat glioma, and one that does not, MCF-7 from human breast tumor. MCF-7 tumorsphere cultures were tested for evidence of circadian rhythms because of previously reported circadian rhythm enhancement in C6 tumorspheres shown by elevated rhythm amplitude and increased expression of circadian clock gene Per2. Bioluminescence imaging of Per2 gene expression in MCF-7 tumorspheres revealed a previously unconfirmed circadian clock in this important cancer research model. Inducing CSC generation through EMT in C6 and MCF-7 monolayer cultures revealed circadian oscillations in the size of the post-EMT CSC population, confirming that circadian rhythms are additional processes controlling this stage of cancer progression. EMT was verified by distinct cellular morphological changes and expression of stem cell proteins OCT4, nestin, MSI1, and CD133 along with EMT-related proteins ZEB1, vimentin, and TWIST. Quantifying single-cell events and behaviors through time-lapse imaging indicated the post-EMT population size was determined largely by circadian rhythms in epithelial-like cancer cells undergoing EMT. We then identified a specific phase of the circadian rhythm in Per2 gene activation as a potential target for therapeutic treatments that may suppress EMT, minimize CSCs, and limit metastasis.
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Abbreviations
- ANOVA:
-
Analysis of variance
- BLI:
-
Bioluminescence imaging
- CCD:
-
Charge-coupled device
- CSC:
-
Cancer stem cell
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- DMEM:
-
Dulbecco’s modified eagle medium
- E-cell:
-
Epithelial cancer cell
- EGF:
-
Epidermal growth factor
- EMT:
-
Epithelial-mesenchymal transition
- FBS:
-
Fetal bovine serum
- FGF:
-
Fibroblast growth factor
- GFAP:
-
Glial fibrillary acidic protein
- HEPES:
-
4-(2-Hydroxyethyl)-1-piperazineethanesulfonic acid
- ICC:
-
Immunocytochemistry
- JTK:
-
Jonckheere-Terpstra-Kendall
- LED:
-
Light-emitting diode
- LS:
-
Lomb-Scargle
- M-cell:
-
Mesenchymal cancer cell
- MAPK:
-
Mitogen activated protein kinase
- MET:
-
Mesenchymal-epithelial transition
- miRNA:
-
MicroRNA
- MSI1:
-
Musashi RNA binding protein 1
- OCT4:
-
Octamer-binding transcription factor 4
- PBS:
-
Phosphate-buffered saline
- PCNA:
-
Proliferating cell nuclear antigen
- PDGF:
-
Platelet derived growth factor
- PDGFRA:
-
Platelet derived growth factor receptor alpha
- qRT-PCR:
-
Quantitative real-time polymerase chain reaction
- ROI:
-
Region of interest
- SCM:
-
Stem cell medium
- SCN:
-
Suprachiasmatic nucleus
- SD:
-
Standard deviation
- SEM:
-
Standard error of the mean
- SM:
-
Serum medium
- TLI:
-
Time-lapse imaging
- TWIST:
-
Twist family basic-helix-loop-helix transcription factor
- ZEB1:
-
Zinc finger E-box binding homeobox 1
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Acknowledgments
We would like to thank Prof. Kathryn M. Eisenmann of The University of Toledo, OH for graciously providing the MCF-7 cell line. We also thank Profs. William Maltese and Amit K. Tiwari of The University of Toledo for valuable advice, Profs. Hitoshi Okamura and Kazuhiro Yagita of Kyota University, Japan for the Per2::Per2:luc construct, and Prof. Vipa Phuntumart of Bowling Green State University, OH for assistance with PCR. We are grateful to BGSU students Ben Fry, Sanjhi D. Gandhi, Jordan C. Hennemyre, and Bomani Ngozi for assistance with data analysis.
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De, A., Beligala, D.H., Sharma, V.P. et al. Cancer stem cell generation during epithelial-mesenchymal transition is temporally gated by intrinsic circadian clocks. Clin Exp Metastasis 37, 617–635 (2020). https://doi.org/10.1007/s10585-020-10051-1
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DOI: https://doi.org/10.1007/s10585-020-10051-1