Abstract
Standard treatment regimen of gliomas has almost reached a bottleneck in terms of survival benefit. Immunotherapy has been explored and applied in glioma treatment. Immunosuppression, as a hallmark of glioma, could be alleviated by inhibiting certain abnormally expressed biomarkers. Here, transcriptome data of 325 whole grade gliomas were collected from the CGGA database. The TCGA RNA sequencing database was used for validation. Western blot was used to verify the expression level of VAT1 on cellular level. The results showed that the expression of VAT1 was positively correlated with the grades of glioma as classified by WHO. A higher expression level of VAT1 was observed in the mesenchymal subtype of gliomas. The area under the curve suggested that the expression level of VAT1 might be a potential prognostic marker of mesenchymal subtype. In survival analysis, we found that patients with high VAT1 expression level tended to have shorter overall survival, which indicated the prognostic value of VAT1 expression. The results of gene ontology analysis showed that most biological processes of VAT1-related genes were involved in immune and inflammatory responses. The results of GSEA analysis showed a negative correlation between VAT1 expression and immune cells. We also identified that the expression of immune checkpoints increased with VAT1 expression. Therefore, the high expression level of VAT1 in patients with glioma was a potential indicator of a lower survival rate for patients with gliomas. Remarkably, VAT1 contributed to glioma-induced immunosuppression and might be a novel target in glioma immunotherapy.
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Abbreviations
- CGGA:
-
Chinese Glioma Genome Atlas
- DA:
-
Dopamine
- GBM:
-
Glioblastoma
- GO:
-
Gene ontology
- GSEA:
-
Gene set enrichment analysis
- GSVA:
-
Gene set variation analysis
- IDH:
-
Isocitrate dehydrogenase
- Mfn:
-
Mitofusin
- NK:
-
Natural Killer
- OS:
-
Overall survival
- siRNA:
-
Small interfering RNA
- TCGA:
-
The Cancer Genome Atlas
- TMZ:
-
Temozolomide
- VAT1:
-
Vesicle amino transport protein 1
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This work was supported by funding from the National Natural Science Foundation of China (No. 81903060) and Beijing Tiantan Hospital Miaopu Project (No. 2017MP05).
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PY, KYW, and XS designed the research. CBZ and ZLW helped with the data analysis. PY and QL performed the experiments. KYW and XS assisted with the experiments. JFW and TJ did the surgeries. PY wrote the original draft. All authors reviewed and edited the final manuscript.
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Supplementary information
262_2021_2865_MOESM1_ESM.pdf
Supplementary Fig.1 GSVA analysis of data from the CGGA (A) and TCGA (B) databases showing the correlation between VAT1 expression and the expression of dopamine-related pathways. (PDF 3953 kb)
262_2021_2865_MOESM2_ESM.pdf
Supplementary Fig.2. GSEA analysis of data from the CGGA database showing the immune checkpoint-related pathway enrichment status of VAT1 positively correlated genes. Enrichment status of CTLA-4-related signaling pathway (A), PDCD1-related pathway (B), LAG3-related pathway (C), and PDCD1LG2-related pathway (D). The NES value is greater than 2 and FDR q value is less than 0.05 in all figures. (PDF 1265 kb)
262_2021_2865_MOESM3_ESM.pdf
Supplementary Fig.3 (related to Figure 6A) A demonstration of full-length gels and blots in western blot analysis. (PDF 288 kb)
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Yang, P., Wang, K., Zhang, C. et al. Novel roles of VAT1 expression in the immunosuppressive action of diffuse gliomas. Cancer Immunol Immunother 70, 2589–2600 (2021). https://doi.org/10.1007/s00262-021-02865-z
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DOI: https://doi.org/10.1007/s00262-021-02865-z