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Metaxins regulate cancer stem cell-like properties in H1299 cells
Heabin Kim1, Seung-Hyun Jung1, Seonmi Jo2
1Department of Bio-material Research, National Marine Biodiversity Institute of Korea, Seocheon, Republic of Korea.
Background:
Lung cancer remains the leading cause of cancer-related mortality and has the highest rates of recurrence and resistance to therapy. Metaxins (MTX1 and MTX2) are outer mitochondrial membrane proteins involved in protein trafficking. In this study, we aimed to elucidate the roles of metaxins in lung cancer.
Methods:
Lung cancer cells (H1299) were transfected with siRNA targeting MTX1 or MTX2. Gene expression and protein levels in the transfected cells were analyzed by reverse transcription polymerase chain reaction (RT-PCR) and western blotting.
Results:
We observed increased methylation levels of the MTX1 promoter in normal fibroblasts compared with those in lung cancer H1299 cells, suggesting that MTX1 expression was transcriptionally regulated. Functional assay results revealed that MTX1 or MTX2 knockdown reduced proliferation, epithelial-mesenchymal transition (EMT), and stemness, whereas their overexpression enhanced these properties in H1299 cells compared with controls. Both metaxins regulated cancer stem cell (CSC)-like features in H1299 cells by modulating levels of aldehyde dehydrogenase 1 (ALDH1) and other CSC markers. MTX1 and MTX2 exhibited interdependent regulation in cells overexpressing these metaxins, highlighting their cooperative roles in EMT and stemness.
Conclusions:
To the best of our knowledge, this is the first study to evidence the involvement of metaxins in CSC maintenance in lung cancer. The findings of this study indicate that MTX1 and MTX2 are potential therapeutic targets for overcoming EMT and stemness in patients with lung cancer.
Insights
Metaxins (MTX1 and MTX2) are key regulators of lung cancer progression, influencing proliferation, epithelial-mesenchymal transition, and stemness. Targeting these proteins may offer new therapeutic strategies for lung cancer treatment.
Area of Science:
- Mitochondrial protein research
- Cancer biology
- Molecular oncology
Background:
- Lung cancer is a leading cause of cancer mortality with high recurrence and therapy resistance.
- Metaxins (MTX1, MTX2) are outer mitochondrial proteins involved in protein trafficking.
- The role of metaxins in lung cancer remains largely unexplored.
Purpose of the Study:
- To investigate the function of metaxins (MTX1 and MTX2) in lung cancer.
- To determine if metaxins play a role in cancer stem cell maintenance and epithelial-mesenchymal transition (EMT).
Main Methods:
- Lung cancer cells (H1299) were treated with siRNA targeting MTX1 or MTX2.
- Gene and protein expression analyzed via RT-PCR and western blotting.
- Functional assays assessed proliferation, EMT, and stemness markers.
Main Results:
- MTX1 promoter methylation correlated with MTX1 expression levels.
- Knockdown of MTX1 or MTX2 reduced proliferation, EMT, and stemness.
- Overexpression of MTX1 or MTX2 enhanced these cancer-associated properties.
- Metaxins modulated aldehyde dehydrogenase 1 (ALDH1) and other cancer stem cell (CSC) markers.
- MTX1 and MTX2 showed interdependent regulation, cooperating in EMT and stemness.
Conclusions:
- This study provides the first evidence of metaxins' involvement in CSC maintenance in lung cancer.
- MTX1 and MTX2 are potential therapeutic targets for overcoming EMT and stemness in lung cancer patients.
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