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Modification of apoptosis-inducing activity of gallic acid by saliva
K Aoki1, S Ishiwata, H Sakagami
1Department of Operative Dentistry, Meikai University School of Dentistry, Sakado, Saitama, Japan.
Abstract:
Gallic acid, a structural unit of tannin, induced apoptotic cell death, characterized by nuclear condensation and caspase activation in human oral tumor cell lines (HSC-2, HSG). Agarose gel electrophoresis demonstrated that gallic acid produced large DNA fragments in these cells, as well as in T-cell leukemia (MOLT-4) and erythroleukemia (K-562) cells, whereas it induced internucleosomal DNA fragmentation in human myelogenous leukemic cell lines (HL-60, ML-1, U-937, THP-1). This indicates that induction of internucleosomal DNA fragmentation or production of large DNA fragments depends on both target cells and inducers. Addition of total saliva dose-dependently reduced the cytotoxicity induction by gallic acid. These data suggested that the biological action of gallic acid might be modified by physiological fluids.
Insights
Gallic acid, a tannin component, triggers programmed cell death in oral tumor cells. Physiological fluids like saliva can modify its cytotoxic effects, highlighting the importance of cellular context.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- Gallic acid is a phenolic compound found in tannins.
- Apoptosis is a critical process in regulating cell death.
- Understanding the cytotoxic mechanisms of natural compounds is vital for drug discovery.
Purpose of the Study:
- To investigate the apoptotic effects of gallic acid on human oral tumor cell lines.
- To determine the DNA fragmentation patterns induced by gallic acid in various cancer cell lines.
- To explore the influence of physiological fluids on gallic acid's cytotoxicity.
Main Methods:
- Treatment of human oral tumor cell lines (HSC-2, HSG) and leukemia cell lines (MOLT-4, K-562, HL-60, ML-1, U-937, THP-1) with gallic acid.
- Assessment of apoptotic cell death markers, including nuclear condensation and caspase activation.
- Agarose gel electrophoresis to analyze DNA fragmentation patterns.
- Evaluation of gallic acid's cytotoxicity in the presence of total saliva.
Main Results:
- Gallic acid induced apoptotic cell death, characterized by nuclear condensation and caspase activation, in oral tumor cells.
- Large DNA fragments were observed in T-cell leukemia (MOLT-4) and erythroleukemia (K-562) cells.
- Internucleosomal DNA fragmentation occurred in human myelogenous leukemic cell lines (HL-60, ML-1, U-937, THP-1).
- Total saliva dose-dependently reduced the cytotoxic effects of gallic acid.
Conclusions:
- Gallic acid induces apoptosis in oral tumor cells through distinct DNA fragmentation pathways depending on the cell type.
- The cytotoxic activity of gallic acid can be modulated by physiological fluids, such as saliva.
- These findings suggest that the biological actions of gallic acid are influenced by the surrounding biological environment.