Abstract
Extracellular vesicle (EV) has received increasing attention over the last decade. However, biomarkers and mechanisms underlying remain largely limited. Three microarray profiles, GSE78718 (K562 leukemia cell line), GSE45301 (U87-MG glioblastoma cell line), and GSE9589 (SW480 colon cancer cell line), were analyzed for the overlapped differentially expressed genes (DEGs). SurvExpress was used for the prognostic analysis of hub genes signature. Predicted transcription factors networks were built by NetworkAnalysis. Characterization between hub genes and immune cells was analyzed by the tumor immune estimation resources (TIMER) and single-sample gene set enrichment analysis (ssGSEA). The most significantly enriched pathway was lysosome. Hub genes included lysosomal-associated membrane protein 1 (LAMP1), heat shock protein family A (Hsp70) member 5 (HSPA5), lysosomal-associated membrane protein 2 (LAMP2), integrin subunit alpha V (ITGAV), and transmembrane protein 30A (TMEM30A). Significant prognostic values of hub genes signature were identified in glioblastoma (P-value = 0.006), but not colon cancer. In colon cancer, ITGAV displayed remarkably high correlation with tumor immune infiltrating cells. In glioblastoma, the highest correlation was found between HSPA5 and dendritic cell. Moreover, distinct association of immune cells between cell and EV were identified via ssGSEA. This study identified biomarkers in EV with potential immunological insights and clinical values.
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Abbreviations
- DEGs:
-
Differentially expressed genes
- GEO:
-
Gene Expression Omnibus
- EV:
-
Extracellular vesicles
- GO:
-
Gene ontology
- KEGG:
-
Kyoto Encyclopedia of Genes and Genomes
- PPI:
-
Protein–protein interaction
- TCGA:
-
The caner genome atlas
- TFs:
-
Transcription factors
- TIICs:
-
Tumor immune infiltrating cells
- TIMER:
-
Tumor immune estimation resources
- SsGSEA:
-
Single-sample gene set enrichment analysis
- LAMP1:
-
Lysosomal-associated membrane protein 1
- HSPA5:
-
Heat shock protein family A (Hsp70) member 5
- LAMP2:
-
Lysosomal-associated membrane protein 2
- ITGAV:
-
Integrin subunit alpha V
- TMEM30A:
-
Transmembrane protein 30A
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CY and WQ carried out data analysis; CY and WQ drafted the manuscript; CY and WQ participated in study design, data collection, and analysis; CY and WQ revised the manuscript; all authors read and approved the final manuscript.
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Supplementary Figure 1. Workflow of the integrated bioinformatics analysis across GSE78718, GSE9589 and GSE45301
. DEGs: differentially expressed genes; KEGG: Kyoto Encyclopedia of Genes and Genomes; GO: gene ontology; TIICs: tumor immune infiltrating cells (PDF 82 kb)
Supplementary Figure 2. Immune cells scores between cell lines and corresponding EVs in GSE78718 using ssGSEA
. A total of 28 types immune cells were included in this analysis. Markers: ns: p>0.05; *:p<0.05; **:p<0.01; ***:p<0.001; red: cell line; blue: microvesicles. (PDF 730 kb)
Supplementary Figure 3. Immune cells scores between cell lines and corresponding EVs in GSE9589
. A total of 28 types immune cells were included in this analysis. Markers: ns: p>0.05; *:p<0.05; **:p<0.01; ***:p<0.001; red: cell line; blue: microvesicles. (PDF 666 kb)
Supplementary Figure 4. Immune cells scores between cell lines and corresponding EVs in GSE4530
. A total of 28 types immune cells (one type was not identified due to the heterogeneity of gene profile) were included in this analysis. Markers: ns: p>0.05; *:p<0.05; **:p<0.01; ***:p<0.001; red: cell line; blue: exosomes. (PDF 651 kb)
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Wang, Q., Yu, C. Identification of biomarkers associated with extracellular vesicles based on an integrative pan-cancer bioinformatics analysis. Med Oncol 37, 79 (2020). https://doi.org/10.1007/s12032-020-01404-7
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DOI: https://doi.org/10.1007/s12032-020-01404-7