Mechanism of miR-518a-5p/HDAC6 axis in DNA oxidative damage in ovarian cancer SKOV3 cells
10.3969/j.issn.1671-7856.2025.03.007
- VernacularTitle:miR-518a-5p/HDAC6轴参与卵巢癌SKOV3细胞DNA氧化损伤的作用机制
- Author:
Ling ZHU
1
;
Weili CAI
1
;
Chao LIU
1
;
Guoying XU
1
;
Miao ZHANG
1
;
Yunfeng YE
1
Author Information
1. 江苏护理职业学院医学技术学院,江苏淮安 223005
- Publication Type:Journal Article
- Keywords:
miR-518a-5p;
histone deacetylase 6;
ovarian cancer;
DNA oxidative damage;
cell apoptosis
- From:
Chinese Journal of Comparative Medicine
2025;35(3):71-81
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the mechanism of the miR-518a-5p/histone deacetylase 6(HDAC6)axis in DNA oxidative damage in ovarian cancer(OC)SKOV3 cells.Methods Expression levels of miR-518a-5p and HDAC6 mRNA in OC tissues and in various cancer cells(A2780,SKOV3,CAOV3)were detected by qRT-PCR.SKOV3 cells were separated into Control,miR-NC,miR-518a-5p mimics,miR-518a-5p mimics+pcDNA-NC,and miR-518a-5p mimics+pc-HDAC6 groups.Cell proliferation and apoptosis were analyzed by colony-forming assay and Hoechst 33258 staining.Expression of phosphorylated histone H2AX(γ-H2AX)was detected by immunofluorescence assay and reactive oxygen species(ROS)were detected by flow cytometry.HDAC6,Bcl-2-associated X protein(Bax),and B-cell lymphoma-2(Bcl-2)protein expression were analyzed by Western blot.The regulatory relationship between miR-518a-5p and HDAC6 was analyzed by dual luciferase assay.The effect and mechanism of miR-518a-5p on oxidative DNA damage in OC cells were studied in a xenotransplantation tumor model.Results miR-518a-5p expression was decreased and HDAC6 expression was increased in OC tissues and A2780,SKOV3,and CAOV3 cells(P＜0.001).Expression levels of miR-518a-5p were lowest and expression levels of HDAC6 were highest in SKOV3 cells,and SKOV3 cells were therefore selected for subsequent experiments.miR-518a-5p expression,apoptosis rate,number of γ-H2AX-positive cells,relative ROS fluorescence intensity,and expression of Bax were all higher in the miR-518a-5p mimics group compared with the miR-NC group,while HDAC6 mRNA and protein expression,Bcl-2 expression,and colony-formation number were all lower(P＜0.001).HDAC6 mRNA and protein expression,colony-formation number,and expression of Bcl-2 were higher in the miR-518a-5p mimics+pc-HDAC6 group compared with the miR-518a-5p mimics+pcDNA-NC group,and the apoptosis rate,number of γ-H2AX-positive cells,relative ROS fluorescence intensity,and expression of Bax were all lower(P＜0.001).HDAC6 had a targeted regulatory relationship with miR-518a-5p.Overexpression of miR-518a-5p decreased tumor volume,weight,and HDAC6 protein expression in tumor tissues,and increased γ-H2AX expression in vivo(P＜0.001).Upregulation of HDAC6 expression by overexpression of miR-518a-5p increased graft tumor volume,weight,and HDAC6 protein expression and decreased γ-H2AX-positive expression(P＜0.05).Conclusions miR-518a-5p expression is reduced and HDAC6 expression is increased in OC tissues and cells.Overexpression of miR-518a-5p can induce oxidative DNA damage in SKOV3 cells by inhibiting HDAC6 expression,thereby inhibiting cell proliferation and promoting cell apoptosis.
