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WIF-1 gene inhibition and Wnt signal transduction pathway activation in NSCLC tumorigenesis
Qiong Tang1, Hui Zhao1,2, Bingjun Yang2
1Department of Respiratory Medicine, Tianjin Union Medical Center, Tianjin 300121, P.R. China.
Abstract:
The aim of the present study is to explore the differential expression of key molecules associated with Wnt signaling in both clinical non-small cell lung cancer (NSCLC) tissue and adjacent normal lung tissue, and to discuss the tumorigenic role of the activation of Wnt signaling pathways in NSCLC. A total of 52 NSCLC patients were employed in the present study. Lung cancer tissue samples and paracarcinoma tissue samples were obtained from these patients, who had undergone surgical resection of their primary cancer. The cases were diagnosed by hematoxylin and eosin staining. Using reverse transcription-quantitative polymerase chain reaction and immunohistochemical straining, the messenger RNA (mRNA) and protein expression levels of Wnt inhibitory factor-1 (WIF-1) and important molecules associated with Wnt signaling pathways were detected. Compared with normal tissues, a marked decreased in the mRNA and protein expression levels of WIF-1, and an increase in β-catenin and cyclin D1 expression, were observed in tumor tissues. This suggests that the activation of the Wnt/β-catenin signaling pathway may be closely associated with lymph nodal metastasis and lower pathological classification. However, no obvious difference could be observed in adenomatous polyposis coli (APC) expression levels between lung cancer tissues and adjacent tissues to the carcinoma. The activation of the Wnt/β-catenin signaling pathway in NSCLC could be initiated by WIF-1 gene inhibition without APC expression changes, and this may be different to the mechanism in other tumors.
Insights
Wnt signaling pathway activation, indicated by decreased Wnt inhibitory factor-1 (WIF-1) and increased β-catenin/cyclin D1, is linked to non-small cell lung cancer (NSCLC) progression. This activation occurs without changes in adenomatous polyposis coli (APC) expression.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Signaling Pathways
Background:
- Non-small cell lung cancer (NSCLC) is a leading cause of cancer mortality worldwide.
- Aberrant activation of signaling pathways, including the Wnt pathway, is implicated in tumorigenesis and progression of NSCLC.
- Understanding the specific molecular mechanisms driving Wnt pathway activation in NSCLC is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the differential expression of Wnt signaling pathway molecules in NSCLC tissues compared to adjacent normal lung tissues.
- To elucidate the role of Wnt signaling pathway activation in the development and progression of NSCLC.
- To explore the potential mechanisms of Wnt pathway activation in NSCLC, focusing on Wnt inhibitory factor-1 (WIF-1) and adenomatous polyposis coli (APC).
Main Methods:
- Analysis of 52 NSCLC patient samples, including tumor and adjacent normal lung tissues.
- Diagnosis confirmation using hematoxylin and eosin staining.
- Quantification of messenger RNA (mRNA) and protein expression levels of WIF-1, β-catenin, cyclin D1, and APC using reverse transcription-quantitative polymerase chain reaction and immunohistochemical staining.
Main Results:
- Tumor tissues exhibited significantly decreased mRNA and protein expression of WIF-1 compared to normal tissues.
- Tumor tissues showed increased expression of β-catenin and cyclin D1 compared to normal tissues.
- No significant difference in adenomatous polyposis coli (APC) expression was observed between tumor and normal tissues.
- Wnt/β-catenin signaling pathway activation correlated with lymph node metastasis and lower pathological classification in NSCLC.
Conclusions:
- The findings suggest that Wnt/β-catenin signaling pathway activation plays a tumorigenic role in NSCLC.
- Wnt pathway activation in NSCLC may be initiated by WIF-1 gene inhibition, independent of APC expression changes.
- This mechanism of Wnt pathway activation in NSCLC might differ from that observed in other cancer types.
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