Abstract
Objective: Circular RNAs (circRNAs) have been extensively implicated in osteoarthritis (OA) progression. Therefore, this study explores the impact of hsa_circ_0004662 on OA progression and the related molecular mechanism.
Methods: Human articular chondrocyte injury was induced by IL-1β to construct the OA model in vitro. Hsa_circ_0004662 and microRNA (miR)-424-5p expression in chondrocytes was evaluated with qRT-PCR. Vascular endothelial growth factors A (VEGFA) expression was examined with qRT-PCR and western blot after hsa_circ_0004662 knockdown or miR-424-5p overexpression in chondrocytes. Subsequent to loss- and gain-of-function assays in IL-1β-induced chondrocytes, the proliferation and apoptosis of chondrocytes were assessed with CCK-8 assay and flow cytometry, respectively. The expression of MMP13, Aggrecan, and apoptosis-related proteins Bax and Bcl-2 was measured with western blot. The binding of miR-424-5p to hsa_circ_0004662 and VEGFA was assessed with a dual-luciferase reporter gene assay.
Results: Hsa_circ_0004662 was up-regulated, but miR-424-5p was down-regulated in IL-1β-induced chondrocytes. Mechanistically, both hsa_circ_0004662 and VEGFA bound to miR-424-5p, and hsa_circ_0004662 enhanced VEGFA expression by downregulating miR-424-5p. Hsa_circ_0004662 knockdown elevated cell proliferation, decreased apoptosis and MMP13 and Bax expression, and increased Aggrecan and Bcl- 2 expression in IL-1β-induced chondrocytes, which was counteracted by further miR- 424-5p down-regulation or VEGFA overexpression.
Conclusion: Hsa_circ_0004662 facilitates OA progression via the miR-424-5p/ VEGFA axis.
[PMID: 32937098]
[http://dx.doi.org/10.1186/s10020-021-00270-x] [PMID: 33446092]
[http://dx.doi.org/10.1007/978-981-13-3681-2_6] [PMID: 30888652]
[http://dx.doi.org/10.1097/BOR.0000000000000479] [PMID: 29227353]
[http://dx.doi.org/10.1007/s11914-018-0477-1] [PMID: 30155845]
[http://dx.doi.org/10.1186/s12943-020-01286-3] [PMID: 33317550]
[http://dx.doi.org/10.1155/2021/8231414] [PMID: 34527744]
[http://dx.doi.org/10.1093/jb/mvaa119] [PMID: 33135071]
[http://dx.doi.org/10.18632/aging.203073] [PMID: 34032607]
[http://dx.doi.org/10.3390/ijms22115959] [PMID: 34073090]
[PMID: 27158337]
[http://dx.doi.org/10.21037/tp-21-244] [PMID: 34430434]
[http://dx.doi.org/10.1007/s00264-013-2192-y] [PMID: 24297611]
[http://dx.doi.org/10.1155/2020/6971503] [PMID: 33376732]
[http://dx.doi.org/10.2147/DDDT.S210220] [PMID: 31631977]
[http://dx.doi.org/10.2147/DDDT.S216596] [PMID: 31686786]
[http://dx.doi.org/10.1016/j.jot.2020.09.006] [PMID: 33376672]
[http://dx.doi.org/10.1016/j.bone.2020.115352] [PMID: 32247817]
[http://dx.doi.org/10.1016/j.mcna.2019.10.007] [PMID: 32035570]
[http://dx.doi.org/10.1016/j.arr.2020.101249] [PMID: 33383189]
[http://dx.doi.org/10.1111/os.12923] [PMID: 33675175]
[http://dx.doi.org/10.3892/etm.2021.10714] [PMID: 34594416]
[http://dx.doi.org/10.3349/ymj.2018.59.3.349] [PMID: 29611396]
[http://dx.doi.org/10.1002/jcp.30091] [PMID: 33037617]
[http://dx.doi.org/10.1186/s13018-021-02391-9] [PMID: 33849596]
[http://dx.doi.org/10.1007/s00535-019-01585-7] [PMID: 31037450]
[http://dx.doi.org/10.18632/aging.203420] [PMID: 34413269]
[http://dx.doi.org/10.1111/os.12690] [PMID: 32436304]
[http://dx.doi.org/10.1002/1878-0261.12468] [PMID: 30719845]
[http://dx.doi.org/10.3892/etm.2021.10682] [PMID: 34539843]
[http://dx.doi.org/10.1002/2211-5463.12801] [PMID: 31975545]
[http://dx.doi.org/10.1002/jbmr.2828] [PMID: 27163679]
[http://dx.doi.org/10.2174/156652408786733739] [PMID: 19075669]
[http://dx.doi.org/10.1007/s11010-020-03712-y] [PMID: 32236863]
[http://dx.doi.org/10.1016/j.lfs.2020.118011] [PMID: 32592723]