Related Experiment Videos
Inhibition of in vitro tumor cell invasion by transmethylation inhibitors
1Department of Tumor Biochemistry, Research Institute, Center for Adult Diseases, Osaka.
Abstract:
Three inhibitors of S-adenosylmethionine-mediated transmethylation, 5'-methylthioadenosine (MTA), 2'-deoxyadenosine and sinefungin, inhibited in vitro invasion by a highly invasive clone (Cl-30) of rat ascites hepatoma cells, AH 130 (AH cells). Difluoromethylthioadenosine (DFMTA), a non-metabolizable derivative of MTA, also caused strong inhibition of invasion at concentrations that did not suppress the growth of the tumor cells. Cl-30 cells precultured in methionine-depleted medium showed decreased invasiveness. DFMTA was also effective on the invasion by fibrosarcoma, B16 melanoma and human lung carcinoma cell lines.
Insights
Inhibitors of S-adenosylmethionine transmethylation, including difluoromethylthioadenosine (DFMTA), significantly reduced cancer cell invasion. This suggests targeting transmethylation pathways could be a novel strategy for cancer therapy.
Area of Science:
- Biochemistry
- Cancer Biology
- Pharmacology
Background:
- Cancer cell invasion is a critical step in metastasis.
- S-adenosylmethionine (SAM)-mediated transmethylation is essential for various cellular processes, including cell proliferation and invasion.
Purpose of the Study:
- To investigate the role of SAM-mediated transmethylation in cancer cell invasion.
- To evaluate the efficacy of transmethylation inhibitors on cancer cell invasion in vitro.
Main Methods:
- In vitro invasion assays using a highly invasive rat ascites hepatoma cell line (AH 130, Cl-30).
- Treatment with S-adenosylmethionine inhibitors: 5'-methylthioadenosine (MTA), 2'-deoxyadenosine, sinefungin, and difluoromethylthioadenosine (DFMTA).
- Assessment of cell growth and invasiveness under different culture conditions (e.g., methionine-depleted medium).
Main Results:
- MTA, 2'-deoxyadenosine, and sinefungin inhibited AH 130 cell invasion.
- DFMTA demonstrated potent inhibition of invasion at non-cytotoxic concentrations.
- Methionine depletion reduced Cl-30 cell invasiveness.
- DFMTA also inhibited invasion in fibrosarcoma, B16 melanoma, and human lung carcinoma cell lines.
Conclusions:
- S-adenosylmethionine-mediated transmethylation plays a significant role in cancer cell invasion.
- DFMTA is a promising inhibitor of cancer cell invasion, effective across multiple cancer types.
- Targeting transmethylation pathways represents a potential therapeutic strategy for inhibiting cancer metastasis.