Abstract
Atherosclerosis (AS) is a chronic inflammatory disease with high morbidity and mortality rates worldwide. This study aimed to investigate the role of circular RNA protein tyrosine phosphatase receptor type A (circRNA_PTPRA) in oxidized low-density lipoprotein (ox-LDL)-induced human umbilical vein endothelial cell (HUVECs) injury and its underlying molecular mechanism. The expression of circRNA-PTPRA and microRNA (miR)-671-5p was assessed by quantitative reverse transcription PCR (qRT-PCR). The interaction between circRNA-PTPRA and miR-671-5p was predicted using bioinformatic analysis. Cell viability and apoptosis were determined using the Cell Counting Kit-8 (CCK-8) assay and flow cytometry, respectively. Inflammation in HUVECs was analyzed by measuring the secretion of tumor necrosis factor alpha (TNF-α), interleukin-1beta (IL-1β), and IL-6 using enzyme-linked immunosorbent assay (ELISA). Cleaved-caspase-3 expression was assessed using western blotting. The results indicated that circRNA-PTPRA expression was significantly increased and miR-671-5p expression was decreased in the serum of patients with AS and in ox-LDL-treated HUVECs. The interaction between circRNA-PTPRA and miR-671-5p was verified by dual luciferase reporter and RNA pull-down assays. In HUVECs, downregulation of circRNA-PTPRA reversed ox-LDL-induced reduction in cell viability, increase in apoptosis, and enhanced inflammation, whereas all these effects mediated by circRNA-PTPRA downregulation in ox-LDL-treated HUVECs were abolished by miR-671-5p downregulation. In conclusion, circRNA-PTPRA downregulation protects against ox-LDL-induced HUVECs injury by upregulating miR-671-5p, thereby providing potential therapeutic targets for AS.
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Data Availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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XL contributed to the conception and design of the study, data acquisition, analysis and interpretation, and also drafted and critically revised the manuscript. XZ contributed to data collection, statistical analysis, and manuscript preparation. All the authors declare that they have read and approved the final manuscript.
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Luo, X., Zhou, X. CircRNA-PTPRA Knockdown Inhibits Atherosclerosis Progression by Repressing ox-LDL-Induced Endothelial Cell Injury via Sponging of miR-671-5p. Biochem Genet 61, 187–201 (2023). https://doi.org/10.1007/s10528-022-10256-x
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DOI: https://doi.org/10.1007/s10528-022-10256-x