Circular RNA SERPINE2 promotes development of glioblastoma by regulating the miR-361-3p/miR-324-5p/BCL2 signaling pathway.

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Emerging evidence has revealed that circRNAs are involved in cancer progression, regulating cancer-related genes through sponging microRNAs (miRNAs). In our study, we identified a novel upregulated circRNA, circSERPINE2, through analyzing circRNAs microarray data of glioblastoma from GEO datasets (GSE146463). Quantitative real-time PCR was used to further confirm the upregulation of circSERPINE2 in glioblastoma cell lines and tissues. Silencing circSERPINE2 inhibits glioblastoma proliferation in vivo and in vitro through cell counting kit-8 (CCK-8) assay, colony formation assay, flow cytometry analysis, and western blot analysis and xenograft tumor model. Mechanistically, circSERPINE2 could directly sponge miR-324-5p and miR-361-3p. BCL2, known as a novel anti-apoptosis gene, is a target gene both of miR-324-5p and miR-361-3p. Thus, circSERPINE2 promotes BCL2 expression through sponging miR-324-5p and miR-361-3p. In conclusion, our study revealed the biological function and mechanism of circSERPINE2 in glioblastoma progression and that circSERPINE2 could be a potential therapeutic target for glioblastoma.", "claims": [{"id": "claim-method", "statement": "The heatmap analysis was done by analyzing the GEO (GSE146463) chip data using the R package Limma R.", "kind": "methodological", "target": null, "evidence": [{"asset": "source:pmid:34553034", "locator": "sections[12] \"Heatmap analysis\" paragraph 2", "quote": "The heatmap analysis was done by analyzing the GEO (GSE146463) chip data using the R package Limma R."}], "state": "complete"}, {"id": "claim-data-access", "statement": "At the start of this study, we downloaded microarray chip data (GSE146463), containing 8 glioblastoma (G) cells and 3 neural progenitor (N) cells, from the GEO website and conducted a differential expression analysis on the data.", "kind": "methodological", "target": null, "evidence": [{"asset": "source:pmid:34553034", "locator": "sections[3] \"circSERPINE2 is upregulated in the glioma tissue and cells\" paragraph 2", "quote": "At the start of this study, we downloaded microarray chip data (GSE146463), containing 8 glioblastoma (G) cells and 3 neural progenitor (N) cells, from the GEO website and conducted a differential expression analysis on the data."}], "state": "complete"}], "gaps": []}, "experiment": {"state": "complete", "objective": null, "steps": [{"id": "read_published_estimate", "order": 1, "name": "Read the published estimate from the source", "kind": "other", "state": "complete", "blocked_on": null, "description": "The claim, method and evidence span published with the source article.", "duration_hours": null, "parameters": {}, "inputs": ["source:pmid:34553034"], "outputs": ["the published estimate and its evidence"], "instruments": [], "reagents": []}, {"id": "obtain_source_data", "order": 2, "name": "Obtain the source data from the named repository", "kind": "data-preparation", "state": "complete", "blocked_on": null, "description": "The GEO series accession resolves and its sample accessions are listed. 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