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CJAP ›› 2021, Vol. 37 ›› Issue (6): 594-600.doi: 10.12047/j.cjap.6111.2021.064

• ORIGINAL ARTICLES • Previous Articles     Next Articles

Effects of miR-133b on oxLDL-induced vascular endothelial cell injury by targeting SGTB

CHEN Gang, CHEN Jiu-lin, WU Jun   

  1. Department of Internal Medicine-Cardiovascular, Qian Xi Nan People's Hospital, Guizhou 562400, China
  • Received:2020-06-09 Revised:2021-01-29 Online:2021-11-28 Published:2021-11-25

Abstract: Objective: To investigate the effect of microRNA-133b (miR-133b) on oxidized low density lipoprotein (oxLDL) induced vascular endothelial cell injury by targeting small protein molecules rich in glutamine 34-tetrapeptide repeats (SGTB). Methods: Human umbilical vein endothelial cells (EVC-304) were induced by 100 μg/ml oxLDL for 24 h to construct a vascular endothelial cell injury model. EVC-304 cells were divided into control group, oxLDL group (oxLDL treatment), oxLDL+miR-NC group (transfectted with 20 nmol/L miR-NC+oxLDL treatment), oxLDL+miR-133b group (transfectted with 20 nmol/L miR-133b mimics +oxLDL treatment), oxLDL+si-NC group (transfectted with 20 nmol/L si-NC+oxLDL treatment), oxLDL+si-SGTB group (transfected with 20 nmol/L si-SGTB+oxLDL treatment), oxLDL+miR-133b+ pcDNA group (transfected with 20 nmol/L si-SGTB and pcDNA+oxLDL), oxLDL+miR-133b+pcDNA-SGTB group (transfected with 20 nmol/L si-SGTB and pcDNA-SGTB), 9 wells in each group. Real-time quantitative PCR (qRT-PCR) and Western blot were used to detect the expression levels of miR-133b and SGTB; flow cytometry was used to detect cell apoptosis; kits were used to detect malondialdehyde (MDA) content and the activities of superoxide disproportionation enzyme (SOD) and glutathione peroxidase (GSH-Px). The expression levels of Bcl-2 and Bax protein were detected by Western blot. The dual luciferase reporter gene assay and Western blot were used to verify the targeted and regulatory between miR-133b and SGTB. Results: Compared with the control group, the expressions of miR-133b and Bcl-2 in EVC-304 cells were decreased significantly after oxLDL induction, while the expression levels of SGTB and Bax were sincreased ignificantly (P<0.05), the MDA content and apoptosis rate were increased significantly (P<0.05), and the activities of SOD and GSH-Px were decreased significantly (P<0.05). Over-expression of miR-133b or interfering with SGTB inhibited oxLDL-induced apoptosis and oxidative stress in EVC-304 cells (P< 0.05). miR-133b directly bound to SGTB, miR-133b overexpression significantly down-regulated SGTB expression (P<0.05), miR-133b inhibition significantly up-regulated SGTB expression (P<0.05) Over-expression of SGTB reversed the effect of over-expressing miR-133b on oxLDL-induced vascular endothelial cell injury (P<0.05). Conclusion: miR-133b could attenuate oxidative stress damage and apoptosis induced by oxLDL in vascular endothelial cells by targeting and inhibiting SGTB expression.

Key words: microRNA-133b, small protein molecules rich in glutamine 34-tetrapeptide repeats, oxidized low density lipoprotein, vascular endothelial cells, apoptosis, oxidative stress injury

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