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LINE-1 Methylation Analysis in Mesenchymal Stem Cells Treated with Osteosarcoma-Derived Extracellular Vesicles
Published on: February 1, 2020
Correlation study of DNA methylation of WNT6 gene with osteosarcoma in children
Li Li1, Chi Xu2, Pingtao Liu1
1Department I of Orthopedics, Jingmen No. 2 People's Hospital, Jingmen, Hubei 448000, P.R. China.
Insights
DNA methylation of the WNT6 gene is linked to childhood osteosarcoma. Lower WNT6 gene methylation correlates with poorer prognosis in pediatric osteosarcoma patients, indicating a potential biomarker.
Area of Science:
- Oncology
- Epigenetics
- Pediatric Cancer Research
Background:
- Osteosarcoma is a primary bone cancer affecting children and adolescents.
- DNA methylation plays a crucial role in gene regulation and cancer development.
- The WNT6 gene's role in osteosarcoma, particularly concerning its epigenetic regulation, requires further investigation.
Purpose of the Study:
- To assess the DNA methylation status of the WNT6 gene in pediatric osteosarcoma.
- To explore the relationship between WNT6 gene methylation and osteosarcoma in children.
- To determine the impact of WNT6 gene methylation on patient prognosis.
Main Methods:
- Immunohistochemical staining for WNT6 protein expression in 50 pediatric osteosarcoma samples.
- Methylation-specific PCR (MSP) to evaluate WNT6 gene DNA methylation levels.
- Western blot analysis in osteosarcoma (MG63) and normal osteoblast (Hfob1.19) cell lines.
- Statistical analysis of clinical and prognostic data to correlate WNT6 methylation with outcomes.
Main Results:
- WNT6 protein was expressed in 84% of primary osteosarcoma cases.
- DNA methylation of the WNT6 gene was detected in 18% of primary osteosarcoma samples.
- Osteosarcoma cells exhibited higher WNT6 protein expression and lower WNT6 gene methylation compared to normal osteoblasts.
- A negative correlation was found between WNT6 gene DNA methylation levels and the prognosis of children with osteosarcoma.
Conclusions:
- High WNT6 gene expression in pediatric osteosarcoma is associated with low DNA methylation levels.
- WNT6 gene DNA methylation is negatively correlated with the prognosis of children diagnosed with osteosarcoma.
- WNT6 gene methylation status may serve as a prognostic biomarker for pediatric osteosarcoma.
Abstract:
The aim of this study was to evaluate the status and explore the impact of DNA methylation of WNT6 gene with osteosarcoma in children. A total of 50 patients with primary osteosarcoma in children were enrolled. The expression of WNT6 protein was determined by immunohistochemical staining. The DNA methylation level of WNT6 gene was evaluated by methylation-specific PCR (MSP). Human MG63 osteosarcoma cells and human normal Hfob1.19 osteoblasts were selected and cultured. Western blot analysis was utilized to measure the expression of WNT6 in the two cell lines. MSP was used to assess the status of DNA methylation of WNT6 gene. The correlation between DNA methylation of WNT6 gene and prognosis of osteosarcoma in children was evaluated by statistical analysis of the clinical and prognostic data. The results of the immunohistochemical assay showed that 84% (42/50) of primary osteosarcoma was WNT6 positive. MSP indicated that DNA methylation of WNT6 gene was found in 9 cases (18%) of primary osteosarcoma. Western blot analysis showed that WNT6 protein expression in MG63 cells was significantly higher than that in normal human Hfob1.19 osteoblasts, whereas, the level of DNA methylation of WNT6 gene in MG63 cells was significantly lower than in Hfob1.19 cells. Analysis of survival, prognosis and their correlation found that the DNA methylation level of WNT6 gene was negatively correlated with the prognosis of children with osteosarcoma. In conclusion, there was a high level of WNT6 gene expression in primary osteosarcoma, which was mainly due to low DNA methylation level of WNT6 gene. The DNA methylation of WNT6 gene was negatively correlated with the prognosis of patients with osteosarcoma in children.
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