Metformin Results in Diametrically Opposed Effects by Targeting Non-Stem Cancer Cells but Protecting Cancer Stem Cells in Head and Neck Squamous Cell Carcinoma
Abstract
:1. Introduction
2. Results
2.1. Metformin Mitigates Cisplatin-Mediated Cell Death in HNSCC CSCs but Reduces Cell Proliferation in Non-Stem HNSCC Cells
2.2. Metformin Increases Stem Cell Characteristics in HNSCC CSC Population
2.3. Computational Binding Analysis Reveals Strong Interaction of Metformin with Mitochondrial Complex III
2.4. Expressions of Complex III Genes Correlate with Clinical Variables and Stem Cell Marker Expressions
3. Discussion
4. Materials and Methods
4.1. Cell Lines and Cultures
4.2. FACS Identification of ALDH+ and ALDH- Cell Populations
4.3. Cell Proliferation Assay
4.4. TUNEL Assay
4.5. Western Blot Analysis
4.6. Quantitative Real-Time PCR and siRNA Knockdown
4.7. Immunofluorescence
4.8. Computational Prediction of Metformin Binding Energy
4.9. Correlation of Complex III Gene Expressions to Survival and Histologic Grade
4.10. Correlation of Complex III Gene Expressions to Expressions of Stem Cell Markers Using TCGA Data
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Abbreviations
CSCs | Cancer stem cells |
HNSCC | Head and neck squamous cell carcinoma |
ROS | Reactive oxygen species |
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CD44 | forward: | 5′-AGAAGAAAGCCAGTGCGTCT-3′ |
CD44 | reverse: | 5′-TGACCTAAGACGGAGGGAGG-3′ |
GAPDH | forward: | 5′-TTCTTTTGCGTCGCCAGCC-3′ |
GAPDH | reverse: | 5′-CGTTCTCAGCCTTGACGGTG-3′ |
BMI1 | forward: | 5′-CGAGACAATGGGGATGTGGG-3′ |
BMI1 | reverse: | 5′-AAATGAATGCGAGCCAAGCG-3′ |
ALDH1A1 | forward: | 5′-CACGCCAGACTTACCTGTCC-3′ |
ALDH1A1 | reverse: | 5′-TTGTACGGCCCTGGATCTTG-3′ |
NANOG | forward: | 5′-AATGGTGTGACGCAGGGATG-3′ |
NANOG | reverse: | 5′-ACCTCGCTGATTAGGCTCCA-3′ |
POU5F1 | forward: | 5′-TCCCGAATGGAAAGGGGAGA-3′ |
POU5F1 | reverse: | 5′-GGCTGAATACCTTCCCAAATAGA-3′ |
ABCG2 | forward: | 5′-TTACGCACAGAGCAAAGCCA-3′ |
ABCG2 | reverse: | 5′-GCAAGGGGCTAGAAGAAGGG-3′ |
PROM1 | forward: | 5′-GAATCCTTTCCATTACGGCGG-3′ |
PROM1 | reverse: | 5′-CCTGAAAAGGAGTTCCCGCA-3′ |
LGR5 | forward: | 5′-GGAGTTACGTCTTGCGGGAA-3′ |
LGR5 | reverse: | 5′-CAGGCCACTGAAACAGCTTG-3′. |
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Kuo, S.Z.; Honda, C.O.; Li, W.T.; Honda, T.K.; Kim, E.; Altuna, X.; Abhold, E.; Wang-Rodriguez, J.; Ongkeko, W.M. Metformin Results in Diametrically Opposed Effects by Targeting Non-Stem Cancer Cells but Protecting Cancer Stem Cells in Head and Neck Squamous Cell Carcinoma. Int. J. Mol. Sci. 2019, 20, 193. https://doi.org/10.3390/ijms20010193
Kuo SZ, Honda CO, Li WT, Honda TK, Kim E, Altuna X, Abhold E, Wang-Rodriguez J, Ongkeko WM. Metformin Results in Diametrically Opposed Effects by Targeting Non-Stem Cancer Cells but Protecting Cancer Stem Cells in Head and Neck Squamous Cell Carcinoma. International Journal of Molecular Sciences. 2019; 20(1):193. https://doi.org/10.3390/ijms20010193
Chicago/Turabian StyleKuo, Selena Z., Christine O. Honda, Wei Tse Li, Thomas K. Honda, Elizabeth Kim, Xabier Altuna, Eric Abhold, Jessica Wang-Rodriguez, and Weg M. Ongkeko. 2019. "Metformin Results in Diametrically Opposed Effects by Targeting Non-Stem Cancer Cells but Protecting Cancer Stem Cells in Head and Neck Squamous Cell Carcinoma" International Journal of Molecular Sciences 20, no. 1: 193. https://doi.org/10.3390/ijms20010193