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[Experimental study on human leukemia cell line K562 senescence induced by ginsenoside Rg1]
Shizhong Cai1, Yue Zhou, Jun Liu
1Department of Histology and Embryology, Institute of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing 400016, China. csz.chn@gmail.com
Objective:
To observe the effect and mechanism of ginsenoside Rg1 in inducing senescence human leukemia K562 cell line.
Method:
Proliferation of K562 cell line induced by Rg1 was detected by MTT colorimetric test for the purpose to screen optimal active concentration and time (20 micromol x L(-1) , 48 h). Impact of Rg1 on cell cycle was analyzed using flow cytometry. The percentage of staining positive cells was detected by SA-beta-Gal staining. The expressions of senescence-related genes such as p16, p53, p21, Rb, were detected by RT-PCR and the changes in ultramicro-morphology were observed by transmission electron microscopy.
Result:
Rg1 can significantly inhibit the proliferation of K562 cells in vitro and arrest the cells in G2/M phase. The percentage of positive cells stained by SA-beta-Gal was dramatically increased (P < 0.05) and the expression of cell senescence-related genes were up-regulated. The observation of ultrastructure showed that cell volume increase, heterochromatin condensation and fragmentation, mitochondrial volume increase, lysosomes increase in size and number.
Conclusion:
Rg1 can induce the senescence of leukemia cell line K562 and play an important role in regulating p53-p21-Rb, p16-Rb cell signaling pathway.
Insights
Ginsenoside Rg1 induces senescence in human leukemia K562 cells by inhibiting proliferation and regulating key cell signaling pathways. This natural compound shows potential for leukemia treatment by promoting cancer cell aging.
Area of Science:
- Oncology
- Cell Biology
- Pharmacology
Background:
- Leukemia K562 cells are a common model for studying human leukemia.
- Ginsenoside Rg1 is a natural compound with potential therapeutic properties.
Purpose of the Study:
- To investigate the effect of ginsenoside Rg1 on inducing senescence in human leukemia K562 cells.
- To elucidate the underlying mechanisms of Rg1-induced senescence.
Main Methods:
- MTT assay for proliferation.
- Flow cytometry for cell cycle analysis.
- SA-beta-Gal staining for senescence.
- RT-PCR for gene expression (p16, p53, p21, Rb).
- Transmission electron microscopy for ultrastructure.
Main Results:
- Ginsenoside Rg1 significantly inhibited K562 cell proliferation and induced G2/M phase arrest.
- Increased SA-beta-Gal staining and upregulation of senescence-related genes (p16, p53, p21, Rb).
- Ultrastructural changes consistent with senescence observed.
Conclusions:
- Ginsenoside Rg1 effectively induces senescence in K562 leukemia cells.
- Rg1 plays a role in regulating the p53-p21-Rb and p16-Rb signaling pathways.
