蜕皮甾酮对脂多糖诱导兔软骨细胞损伤的保护作用

摘要

Objective To study the effect of ecdysterone (EDS) on rabbits chondrocytes that is injuried by lipopolysac⁃charide (LPS). Methods Aricular chondrocytes were isolated from rabbits and randomly divided into three groups:control group;chondrocytes with LPS induced injury (LPS group);injury chondrocytes treated with EDS (LPS+EDS group). The cell proliferation and cell apoptosis of chondrocytes were determined by MTT method and flow cytometry assay respectively. The mRNA and protein expression levels of inducible nitric oxide synthase (iNOS) were detected by RT-PCR and western blot. In addition, the content of NO and IL-1βwere measured by nitric acid reductase assay and enzyme-linked immunosorbent assay (ELISA) respectively. Results Attenuated proliferation, increased cell apoptosis, iNOS, NO and IL-1βwere seen in LPS group , but all these changes were significantly reversed by EDS treatment (P<0.05). Conclusion Ecdysterone exhib⁃ited a protective effect on LPS induced rabbits chondrocytes injury through inhibiting the expression of iNOS.%目的：探讨蜕皮甾酮（EDS）对脂多糖（LPS）诱导的兔软骨细胞损伤的保护作用及其机制。方法体外分离、培养兔关节软骨细胞，随机分为对照组、LPS诱导损伤组（LPS组），蜕皮甾酮干预组(LPS+EDS组)。MTT法和流式细胞术分别检测各组细胞增殖率及细胞凋亡率；RT-PCR和Western blot检测软骨细胞中诱导型一氧化氮合酶（iNOS）表达；硝酸还原酶法和ELISA法分别检测各组NO及白细胞介素（IL）-1β含量。结果与对照组相比，LPS组细胞增殖率降低，凋亡率升高，iNOS mRNA和蛋白表达量以及NO和IL-1β含量增高(均P<0.05)。LPS+EDS组较LPS组细胞增殖率升高，凋亡率降低，iNOS mRNA和蛋白表达量及NO和IL-1β的含量降低（均P<0.05）。结论蜕皮甾酮对LPS诱导的兔软骨细胞损伤具有保护作用，其保护作用可能与抑制iNOS表达有关。