Related Experiment Video
Updated: May 20, 2025
Through the Looking Glass: Time-lapse Microscopy and Longitudinal Tracking of Single Cells to Study Anti-cancer Therapeutics
Published on: May 14, 2016
Eurycomalactone switched hepatocellular carcinoma cells into quiescence through 5'tRFAla/DVL/β-catenin pathway
Zhipeng Zhang1, Yanmei Wu1, Wenqiang Liang1
1The Medical Interdisciplinary Science Research Center of Western Guangdong, The Second Affiliated Hospital of Guangdong Medical University, 524003, Zhanjiang, Guangdong Province, People's Republic of China.
Abstract:
Although tsRNA has been demonstrated to modulate various physiological processes analogous to miRNA, the potential regulatory functions and mechanisms of tsRNAs related to the pharmacological effects of small molecule drugs remain unclear. Herein, it is shown that eurycomalactone (ELT), a natural product, can reversibly switch hepatocellular carcinoma (HCC) PLC/PRF/5 and HUH7 cells into a quiescent state. This quiescence is characterized by cell proliferation inhibition without cytotoxicity, cell cycle arrest at the G0/G1 phase, and cell reactivation following the removal of ELT. Given the established role of β-catenin activity in mediating cancer cellular quiescence or proliferation, a notable reduction in total, cytoplasmic, and nuclear β-catenin expression, along with its downstream targets Survivin, c-myc, and Cyclin D1, was observed in ELT-treated cells. Subsequently, two new tsRNAs, namely 5'tRFAla and 5'tiRNAAla, which match well with the mRNAs of two pivotal upstream regulators (DVL2 and DVL3) of β-catenin based on bioinformatics analyses, were detected to be significantly decreased in ELT-treated PLC/PRF/5 cells using Arraystar small RNA microarray analyses. Consistently, the concentrations of the DVL2 and DVL3 proteins were also found to be reduced by ELT. The mimic of 5'tRFAla could increase the relative expression of DVL2 and DVL3 mRNA and rescue their decrease induced by ELT, while the mimic of 5'tiRNAAla could not. It therefore seems that ELT could down-regulate the expression of 5'tRFAla, leading to the suppression of DVL2 and DVL3 mRNA translation, consequently inhibiting the β-catenin signaling pathway and reversibly switching HCC cells into a quiescent state. Conclusively, our findings imply that tsRNAs, like miRNAs, might activate the translation of their matched mRNAs in non-dividing cells and provide a possible potential for repressing tumor cell growth, although further evidence is still needed.
Insights
Eurycomalactone (ELT) induces reversible cell quiescence in hepatocellular carcinoma (HCC) by downregulating 5'tRF'$, Ala', a type of tsRNA. This mechanism inhibits the beta-catenin pathway, offering potential for tumor growth repression.
Area of Science:
- Molecular Biology
- Cancer Research
- Pharmacology
Background:
- The role of tRNA-derived small RNAs (tsRNAs) in drug response is largely unknown.
- Eurycomalactone (ELT) is a natural product with potential anti-cancer properties.
- Hepatocellular carcinoma (HCC) cells exhibit complex regulatory mechanisms involving cell cycle and signaling pathways.
Purpose of the Study:
- To investigate the mechanism by which ELT induces reversible quiescence in HCC cells.
- To identify potential tsRNA regulators involved in ELT's pharmacological effects.
- To elucidate the role of the beta-catenin signaling pathway in ELT-mediated quiescence.
Main Methods:
- Hepatocellular carcinoma cell culture (PLC/PRF/5 and HUH7) treated with ELT.
- Cell proliferation, cytotoxicity, and cell cycle analysis (G0/G1 arrest).
- Western blotting for beta-catenin and downstream targets (Survivin, c-myc, Cyclin D1).
- Arraystar small RNA microarray to detect tsRNA expression.
- Bioinformatic analysis to predict tsRNA-mRNA interactions.
- tsRNA mimic transfection to validate regulatory roles.
Main Results:
- ELT induced reversible cell cycle arrest at G0/G1 without cytotoxicity.
- ELT treatment reduced beta-catenin signaling pathway components.
- Two tsRNAs, 5'tRF Ala and 5'tiRNA Ala , were identified, with 5'tRF Ala significantly decreased by ELT.
- Overexpression of 5'tRF Ala mimicked ELT's effect on DVL2/DVL3 expression and beta-catenin pathway, while 5'tiRNA Ala did not.
- ELT downregulates 5'tRF Ala , suppressing DVL2/DVL3 translation and inhibiting beta-catenin signaling.
Conclusions:
- ELT induces reversible quiescence in HCC cells by downregulating 5'tRF Ala , leading to beta-catenin pathway inhibition.
- tsRNAs may function analogously to miRNAs in regulating mRNA translation, particularly in non-dividing cells.
- This study highlights tsRNAs as potential therapeutic targets for repressing tumor growth in HCC.
More Related Videos
12:02Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols
Published on: June 6, 2017
06:28Immunofluorescence to Monitor the Cellular Uptake of Human Lactoferrin and its Associated Antiviral Activity Against the Hepatitis C Virus
Published on: October 1, 2015
