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Updated: Mar 8, 2026
Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
Published on: August 5, 2022
Missing in metastasis B, regulated by DNMT1, functions as a putative cancer suppressor in human lung giant-cell
Hong Wang1,2, Xiaomin Yu2, Xiaofang Wang2
1School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Abstract:
Missing in metastasis B (MIM-B) has been widely reported to inhibit cancer cell invasion and proliferation in a variety of human cancers. However, the functions of MIM-B in lung cancers are still controversial. In addition, the mechanisms and regulation of MIM-B are poorly understood. In the present study, we found that the invasion level of 95C human lung giant-cell carcinoma cells was elevated when MIM-B was knocked down, while the invasion of 95D was suppressed when MIM-B was overexpressed, proving that MIM-B suppresses human lung giant-cell carcinoma cell invasion, which is similar to its function in most cancers. Furthermore, we reported that an increase in DNA methylation density in the promoter of MIM-B by DNA methyltransferase 1 (DNMT1) is correlated with the silencing of MIM-B expression and the high metastasis of 95D human lung giant-cell carcinoma cell line. Taken together, MIM-B, which is regulated by DNMT1 through DNA methylation, is a putative cancer suppressor in human lung giant-cell carcinoma.
Insights
Missing in metastasis B (MIM-B) suppresses lung cancer invasion. DNA methylation by DNMT1 silences MIM-B, promoting metastasis in lung giant-cell carcinoma.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Missing in metastasis B (MIM-B) is known to inhibit cancer cell invasion and proliferation.
- The role and regulatory mechanisms of MIM-B in lung cancers remain unclear and debated.
- Understanding MIM-B's function is crucial for developing targeted lung cancer therapies.
Purpose of the Study:
- To investigate the function of MIM-B in human lung giant-cell carcinoma.
- To elucidate the regulatory mechanisms controlling MIM-B expression in lung cancer.
- To determine if MIM-B acts as a tumor suppressor in this specific cancer type.
Main Methods:
- Gene knockdown and overexpression experiments in 95C and 95D human lung giant-cell carcinoma cell lines.
- Analysis of DNA methylation density in the MIM-B promoter region.
- Correlation studies between MIM-B expression, DNA methylation, and cellular invasion/metastasis.
Main Results:
- MIM-B knockdown increased invasion in 95C cells, while MIM-B overexpression suppressed invasion in 95D cells.
- Increased DNA methylation density in the MIM-B promoter was observed.
- DNA methyltransferase 1 (DNMT1) was found to increase DNA methylation, correlating with MIM-B silencing and high metastasis in 95D cells.
Conclusions:
- MIM-B functions as a suppressor of invasion in human lung giant-cell carcinoma.
- DNMT1 regulates MIM-B expression via DNA methylation, impacting lung cancer metastasis.
- MIM-B is a potential tumor suppressor in human lung giant-cell carcinoma, regulated by epigenetic mechanisms.
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