Effect of ox-LDL on contrast-induced renal tubular epithelial cell apoptosis and its mechanism
10.3760/cma.j.cn121382-20250516-00037
- VernacularTitle:ox-LDL对造影剂诱导的肾小管上皮细胞凋亡的影响及机制研究
- Author:
Sha CHEN
1
;
Manyu ZHANG
;
Yufeng ZHANG
;
Dingwei YANG
Author Information
1. 天津大学天津医院肾内科，天津 300211
- Keywords:
Renal tubular epithelial cell;
Apoptosis;
Contrast-induced acute kidney injury;
Oxidized-low density lipoprotein;
Mitochondrial fusion;
Mitochondrial fissi
- From:
International Journal of Biomedical Engineering
2025;48(4):351-356
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the effect of oxidized-low density lipoprotein (ox-LDL) on contrast-induced renal tubular epithelial cell apoptosis and its mechanism.Methods:Human renal proximal tubular epithelial HK-2 cells were cultured in vitro and divided into four groups using the random number table method, including a control group, an ox-LDL group (50 μg/ml ox-LDL), an iohexol group (100 mg I/ml iohexol) and an ox-LDL+iohexol group (50 μg/ml ox-LDL+100 mg I/ml iohexol). Apoptosis rates were detected using the in situ terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling assay. Western blotting was used to detect the level of apoptosis by evaluating the presence of cleaved cysteine aspartic acid specific protease-3 (cleaved Caspase-3) protein. Mitochondrial membrane potential was detected using the JC-1 method. Mitochondrial/cytoplasmic cytochrome C (Cyt C) levels were detected by Western blotting to assess mitochondrial damage. Western blotting was used to detect the levels of the mitochondrial fission-related dynamin-related protein 1 (Drp1) and the mitochondrial fusion-related optic atrophy protein 1 (OPA1) to evaluate mitochondrial fusion/fission. Independent sample t test and one-way analysis of variance were used for data analysis. Results:The apoptosis rate [(30.12±3.19)%] and the relative expression of cleaved Caspase-3 protein (0.34±0.07) in the iohexol group were higher than those in the control group [(4.77±1.68)%, 0.23±0.05] ( P<0.05, 0.01). The apoptosis rate [(48.81±4.96)%] and the relative expression of cleaved Caspase-3 protein (0.53±0.05) in the ox-LDL+iohexol group were higher than those in the iohexol group (both P<0.01). The mitochondrial membrane potential (1.61±0.15) and mitochondrial/cytoplasmic Cyt C ratio (1.09±0.14) in the iohexol group were lower than those in the control group (6.15±0.52 and 3.09±0.45) (both P<0.01). The mitochondrial membrane potential (0.27±0.01) and the mitochondrial/cytoplasmic Cyt C ratio (0.24±0.04) in the ox-LDL+iohexol group were lower than those in the iohexol group (both P<0.01). The relative expression of Drp1 protein in the iohexol group (0.49±0.05) was higher than that in the control group (0.29±0.03), the relative expression of long OPA1 protein (0.24±0.03) was lower than that of the control group (0.40±0.03) (both P<0.01). The relative expression of Drp1 protein in the ox-LDL+iohexol group (0.64±0.02) was higher than that in the iohexol group, the relative expression of long OPA1 protein (0.07±0.02) was lower than that in the iohexol group (both P<0.01). Conclusions:ox-LDL can exacerbate contrast-induced renal tubular epithelial cell apoptosis, and its mechanism may be due to an imbalance in mitochondrial fusion and division caused by the contrast agent, leading to the increase mitochondrial damage.
