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Tumor cell growth is inhibited by suppressing metallothionein-I synthesis
1Department of Radiobiochemistry, School of Pharmaceutical Sciences, University of Shizuoka, Yada, Japan. takedaa@ys7.u-shizuoka-ken.ac.jp
Abstract:
The effect of metallothionein (MT)-I antisense oligodeoxynucleotide (ODN) on the growth of three kinds of tumor cells was studied, since MTs may be involved in cell growth. When MT-I antisense ODN was added to leukemia P388 cells, cell growth was inhibited in a manner dependent on the dose and incubation time. MT-I antisense ODN was also inhibitory for other tumor cell lines, i.e. Ehrlich carcinoma and sarcoma 180. A significant decrease in the level of MT, but not of Zn, was observed in MT-I antisense ODN-treated cells. On the other hand, control ODN did not inhibit the cell growth appreciably. These results indicate that MT-I expression may be necessary for the growth and survival of these tumor cells.
Insights
Metallothionein-I (MT-I) antisense oligodeoxynucleotide (ODN) inhibited tumor cell growth, including leukemia, Ehrlich carcinoma, and sarcoma 180. This suggests MT-I expression is crucial for tumor cell growth and survival.
Area of Science:
- Molecular Biology
- Cancer Research
- Biochemistry
Background:
- Metallothioneins (MTs) are proteins involved in cellular processes, potentially including cell growth.
- The specific role of MT-I in tumor cell proliferation requires further investigation.
Purpose of the Study:
- To investigate the effect of MT-I antisense oligodeoxynucleotide (ODN) on the growth of various tumor cell lines.
- To determine if MT-I expression is essential for tumor cell survival and proliferation.
Main Methods:
- Treatment of leukemia P388, Ehrlich carcinoma, and sarcoma 180 cells with MT-I antisense ODN.
- Dose- and time-dependent analysis of cell growth inhibition.
- Measurement of MT and zinc (Zn) levels in treated cells.
Main Results:
- MT-I antisense ODN significantly inhibited the growth of all tested tumor cell lines.
- Inhibition was dependent on both the dose and incubation time of the ODN.
- A notable decrease in MT levels, but not Zn levels, was observed in treated cells.
- Control ODN showed no significant effect on cell growth.
Conclusions:
- MT-I expression appears necessary for the growth and survival of these tumor cells.
- Targeting MT-I with antisense ODN represents a potential strategy for cancer therapy.