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Tetrazolium violet induces G0/G1 arrest and apoptosis in brain tumor cells
Yunfeng Zhao1, Nan Zhang, Qingzhong Kong
1School of Life Science, Shandong University, Jinan 250100, China.
Abstract:
Tetrazolium violet (TV), a potent anticancer agent, has been shown to induce cell growth-inhibition in tumor cells. However, the related mechanism has not been revealed yet. In this report we assessed the influence of TV on cell growth and cell cycle in brain tumor cells. Treatment of C6 tumor cells with TV (5-15 microM for 24-72 h) resulted in a growth inhibition in a dose and time-dependent manner and G0/G1 phase arrest, determined by flow cytometry analysis. These effects were accompanied by apoptosis other than necrosis, evidenced by nuclear condensation, terminal deoxynucleotidyl transferase-mediated nick end labeling (TUNEL) assay and trypan blue exclusion assay plus lactate dehydrogenase (LDH) release assay. Treatment of cells with TV at 15 microM for 24 h resulted in an increase in the activity of caspase-3, evidenced by colorimetric assay, and a dramatic up-regulation of p53, accompanied with a significant increase of Bax/Bcl-2 ratio, as evidenced by immunofluorescence assay. These results suggest that TV induces growth inhibition of C6 cells through p53-midiated apoptotic pathway and G0/G1 checkpoint mechanism. Although detailed mechanisms remain to be explored, selective blockage of tumor cells in G0/G1 phase accompanied by p53-associated apoptosis makes tetrazolium violet a promising anticancer agent, meriting further investigations.
Insights
Tetrazolium violet effectively inhibits brain tumor cell growth by inducing apoptosis and cell cycle arrest. This anticancer agent shows promise through its p53-mediated pathway and G0/G1 checkpoint mechanism.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Tetrazolium violet (TV) is a known anticancer agent.
- The precise mechanism of TV's action on tumor cells, particularly brain tumors, remains largely unelucidated.
- Understanding TV's effects on cell cycle and apoptosis is crucial for its therapeutic development.
Purpose of the Study:
- To investigate the effects of Tetrazolium violet (TV) on the growth and cell cycle progression of C6 brain tumor cells.
- To elucidate the mechanism underlying TV-induced cell growth inhibition, focusing on apoptosis and cell cycle regulation.
Main Methods:
- C6 tumor cells were treated with varying concentrations (5-15 microM) and durations (24-72 h) of TV.
- Cell growth inhibition was assessed using cell counting and viability assays.
- Cell cycle distribution was analyzed via flow cytometry.
- Apoptosis was evaluated using nuclear condensation, TUNEL assay, trypan blue exclusion, and LDH release assays.
- Caspase-3 activity, p53 levels, and Bax/Bcl-2 ratio were determined using colorimetric and immunofluorescence assays.
Main Results:
- TV demonstrated dose- and time-dependent inhibition of C6 cell growth.
- TV treatment led to a significant G0/G1 phase cell cycle arrest.
- Apoptosis, characterized by nuclear condensation and increased caspase-3 activity, was induced by TV, not necrosis.
- TV significantly upregulated p53 and increased the Bax/Bcl-2 ratio, indicating activation of the intrinsic apoptotic pathway.
Conclusions:
- Tetrazolium violet induces growth inhibition in C6 brain tumor cells via a p53-mediated apoptotic pathway.
- TV selectively blocks tumor cells in the G0/G1 phase, triggering apoptosis.
- These findings highlight TV as a promising anticancer agent warranting further investigation for brain tumor therapy.
