The Circular RNA Circ_0099630/miR-940/receptor-associated Factor 6 Regulation Cascade Modulates the Pathogenesis of Periodontitis

Overview

Journal J Dent Sci

Specialty Dentistry

Date 2022 Oct 27

PMID 36299308

Authors

Xue-Qin Zhao

Chuan-Bei Ao

Yi-Tong Yan

Affiliations

Soon will be listed here.

Abstract

Background/purpose: Periodontitis is one of the highly prevalent chronic inflammatory conditions in adults. The importance of circular RNAs (circRNAs) in the regulation of inflammation has been gradually reported in recent years, but the role of circRNA circ_0099630 in periodontitis has not been reported.

Materials And Methods: The contents of circ_0099630, microRNA-940 (miR-940) and tumor necrosis factor (TNF) receptor-associated factor 6 (TRAF6) were measured using quantitative real-time polymerase chain reaction (qRT-PCR) or Western blot. Inflammatory factor secretion, cell proliferation, and apoptosis were analyzed under the application of Enzyme-linked immunosorbent assay (ELISA), Cell Counting Kit-8 (CCK8), 5-ethynyl-2'-deoxyuridine (EdU) and flow cytometry, respectively. The Western blot also analyzed the phosphorylation levels of RELA proto-oncogene (P65) and IkappaBalpha (IκBα), key molecules of the nuclear factor kappa-B (NF-κB) pathway. The relationship between miR-940 and circ_0099630 or TRAF6 was verified by luciferase reporter system and RNA immunoprecipitation (RIP) assay.

Results: Higher abundance of circ_0099630 and TRAF6 and lower miR-940 expression were observed in periodontitis, and circ_0099630 knockdown attenuated the damage of human PDL cells (PDLCs) induced by lipopolysaccharides (LPS). The relationship between miR-940 and circ_0099630 or TRAF6 was evidenced, while miR-940 downregulation diminished the repair effect of si-circ_0099630 on overexpression LPS-induced damage in PDLCs. Similarly, TRAF6 upregulation impaired the mitigating effect of miR-940 overexpression on LPS-induced injury in PDLCs. Circ_0099630 silencing evidently curbed the phosphorylation levels of P65 and IκBα and thus attenuating the inflammatory response by acting on the miR-940/TRAF6 axis.

Conclusion: Silencing circ_0099630 alleviates LPS-induced periodontal ligament cell injury via targeting miR-940/TRAF6/NF-κB in periodontitis.

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