Abstract
Purpose
l-Theanine is a unique non-protein amino acid found in green tea, which has been identified as a safe dietary supplement. It has been reported that l-theanine exerts various biological activities. In this study, we explored the anti-cancer effects of l-theanine on melanoma cells.
Methods
A375, B16–F10, and PIG1 cell lines were used in the present study. EdU labeling, TUNEL and Annexin V/PI staining, wound-healing, and transwell migration assay were performed to detect the effects of l-theanine on melanoma cell proliferation, apoptosis, and migration. Brain and muscle Arnt-like protein 1 (BMAL1) was knocked down in melanoma cells to evaluate if l-theanine plays the anti-cancer role through regulating circadian rhythm of melanoma cells. The western blot, qRT-PCR, and dual luciferase assay were performed to explore the mechanism involved in the effects of l-theanine on melanoma cells.
Results
l-Theanine apparently reduced the viability of melanoma cells. Further experiments showed that l-theanine attenuated the proliferation and migration, and promoted apoptosis of melanoma cells. l-Theanine significantly enhanced the expression of BMAL1, a clock gene in melanoma cells. Down-regulation of BMAL1 suppressed the anti-cancer effects of l-theanine on melanoma cells. Further experiments indicated that the p53 transcriptional activity raised by l-theanine was dependent on BMAL1 expression in melanoma cells.
Conclusion
l-Theanine exerts the anti-cancer effect on melanoma cells through attenuating the proliferation and migration, and promoting apoptosis of them, which is dependent on the regulation of the clock gene Bmal1 in melanoma cells.
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Abbreviations
- BMAL1:
-
Brain and muscle Arnt-like protein
- CLOCK:
-
Circadian locomotor output cycles kaput
- CRY1:
-
Cryptochrome 1
- EdU:
-
5-Ethynyl-2′-deoxyuridine
- ICAM-1:
-
Intracellular adhesion molecule-1
- MMP:
-
Matrix metalloproteinase
- PCNA:
-
Proliferating cell nuclear antigen
- PER1:
-
Period 1
- PER2:
-
Period 2
- TUNEL:
-
Terminal deoxynucleotidyl transferase dUTP nick-end labeling
- VCAM-1:
-
Vascular cell adhesion molecule-1
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Acknowledgements
This work was funded by the National Natural Science Foundation of China [Nos. 81711703].
Funding
This work was supported by the National Natural Science Foundation of China [Nos. 81711703].
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RZ, ZY, and LL conceived and designed the research. RZ, SZ, ZG, YW, and GY performed the experiment and acquired the data. RZ and SZ performed statistical analysis. RZ and LL drafted the manuscript. LL handled funding and supervision.
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Zhang, R., Zheng, S., Guo, Z. et al. l-Theanine inhibits melanoma cell growth and migration via regulating expression of the clock gene BMAL1. Eur J Nutr 61, 763–777 (2022). https://doi.org/10.1007/s00394-021-02677-y
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DOI: https://doi.org/10.1007/s00394-021-02677-y