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[Defective expression of TGFBR3 gene and its molecular mechanisms in non-small cell lung cancer cell lines]
Xiefang Jiang1, Rengyun Liu, Zhe Lei
1Soochow University Laboratory of Cancer Molecular Genetics, Suzhou 215123, China.
Background And Objective:
It has been reported that defective expression of TGFBR3 was found in non-small cell lung cancer (NSCLC). However, its molecular mechanisms remain unclear. The aim of this study is to investigate expression of TGFBR3 in NSCLC cell lines and normal human bronchial epithelial cell (HBEpiC), and to explore potential molecular mechanisms underlying inactivation of TGFBR3 gene.
Methods:
Western blot was performed to determine the expression of TGFBR3 in HBEpiC and NSCLC cell lines. Automatic image analysis was carried out to estimate relative expression of TGFBR3 protein. We screened for mutation of the promoter region of TGFBR3 gene using DNA direct sequencing. Bisulfite-sodium modification sequencing was used to detect the methylation status of TGFBR3 promoter.
Results:
TGFBR3 protein level was abnormally reduced in NSCLC cell lines as compared with HBEpiC. There was significant difference in TGFBR3 expression between the highly metastatic cell line 95D and non-metastatic cell lines, including LTEP-alpha-2, A549 and NCI-H460. No mutation and methylation was found in upstream sites -165 to -75 of the proximal promoter of TGFBR3 in HBEpiC and NSCLC cell lines. Hypermethylation was shown in upstream sites -314 to -199 of the distal promoter of TGFBR3 in HBEpiC and NSCLC cell lines.
Conclusion:
Reduced expression of TGFBR3 was observed in NSCLC cell lines, especially in 95D, suggesting that TGFBR3 might play an important role in development and progression of NSCLC and correlate with NSCLC invasion and migration. The methylation event occurring at TGFBR3 promoter is not a major cause for reduction of TGFBR3 expression.
Insights
Transforming growth factor beta receptor 3 (TGFBR3) is downregulated in non-small cell lung cancer (NSCLC). Promoter methylation does not appear to be the primary cause for this reduced TGFBR3 expression in NSCLC.
Area of Science:
- Oncology
- Molecular Biology
- Gene Expression Analysis
Context:
- Defective expression of TGFBR3 has been observed in non-small cell lung cancer (NSCLC).
- The precise molecular mechanisms underlying TGFBR3 inactivation in NSCLC remain largely unelucidated.
- Understanding these mechanisms is crucial for developing targeted therapies.
Purpose:
- To investigate the expression levels of TGFBR3 in NSCLC cell lines versus normal human bronchial epithelial cells (HBEpiC).
- To explore potential molecular mechanisms, including gene mutations and promoter methylation, responsible for TGFBR3 inactivation in NSCLC.
- To correlate TGFBR3 expression with NSCLC metastatic potential.
Summary:
- TGFBR3 protein levels were significantly reduced in NSCLC cell lines compared to HBEpiC.
- A notable difference in TGFBR3 expression was observed between highly metastatic (95D) and non-metastatic NSCLC cell lines.
- While hypermethylation was detected in the distal promoter region, it was not identified as the primary driver for reduced TGFBR3 expression.
Impact:
- The findings suggest TGFBR3 plays a significant role in NSCLC development, progression, and metastasis.
- This study highlights the potential of TGFBR3 as a biomarker for NSCLC invasion and migration.
- The research clarifies that promoter methylation is not the main mechanism behind TGFBR3 downregulation in NSCLC.
