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Methylglyoxal-induced apoptosis in human prostate carcinoma: potential modality for prostate cancer treatment
D M Milanesa1, M S Choudhury, C Mallouh
1Department of Urology, New York Medical College, Valhalla, NY 10595, USA.
Objective:
To examine the cellular effects of methylglyoxal (MG), a toxic physiological metabolite, on human prostatic cancer PC-3 cells.
Methods:
The effects of MG on cell growth and viability were evaluated first, and then its effects on the cell cycle and the glycolytic process were analyzed by Western blots and specific assays. Possible MG-induced apoptosis was also assessed by DNA analysis using agarose gel electrophoresis.
Results:
MG > or =3 mM caused severe growth inhibition, resulting in nearly 100% cell death by 24h. The time course study revealed that expression of cyclin D(1), cdk2, and cdk4 was significantly (>50%) downregulated in 3 h of MG (3 mM) exposure, followed by the dephosphorylation of retinoblastoma protein by 6 h. Both the glyceraldehyde-3-phosphate dehydrogenase activity and the cellular lactate level were also reduced by approximately 50 and 80%, respectively, following 6-hour MG exposure. Induction of apoptosis by MG was indicated by partial degradation of poly(ADP-ribose) polymerase and further confirmed by discrete DNA fragmentation detected on an agarose gel.
Conclusion:
MG is capable of inducing apoptosis in prostatic cancer PC-3 cells, due primarily to a blocking of the cell cycle progression (G(1) arrest) and glycolytic pathway. Therefore, MG could be a potent apoptosis inducer, which may have a potential for prostate cancer treatment.
Insights
Methylglyoxal (MG) induces apoptosis in human prostate cancer cells by arresting cell cycle progression and inhibiting the glycolytic pathway. This suggests MG
Area of Science:
- Biochemistry
- Cell Biology
- Oncology
Background:
- Methylglyoxal (MG) is a toxic metabolite found in physiological conditions.
- Prostate cancer remains a significant health concern, necessitating novel therapeutic strategies.
Purpose of the Study:
- To investigate the cellular effects of methylglyoxal (MG) on human prostate cancer PC-3 cells.
- To determine MG's potential as an apoptosis inducer for prostate cancer treatment.
Main Methods:
- Cell viability and growth assays were performed.
- Western blots and specific assays analyzed cell cycle and glycolytic processes.
- Apoptosis was assessed via DNA fragmentation analysis.
Main Results:
- Methylglyoxal (MG) at concentrations ≥3 mM caused significant growth inhibition and cell death.
- MG exposure led to downregulation of cell cycle proteins (cyclin D1, cdk2, cdk4) and retinoblastoma protein dephosphorylation.
- Glyceraldehyde-3-phosphate dehydrogenase activity and lactate levels were reduced, indicating glycolytic inhibition.
- MG induced apoptosis, evidenced by poly(ADP-ribose) polymerase degradation and DNA fragmentation.
Conclusions:
- Methylglyoxal (MG) effectively induces apoptosis in prostate cancer PC-3 cells.
- Apoptosis is mediated by cell cycle arrest (G1 phase) and inhibition of the glycolytic pathway.
- MG demonstrates potential as a therapeutic agent for prostate cancer treatment.