二氮嗪通过抑制内质网应激作用降低软骨细胞凋亡的研究

目的 探讨二氮嗪对H₂O₂诱导的软骨细胞凋亡的机制研究。 方法 每组取3只SD大鼠膝关节软骨细胞进行原代培养,将软骨细胞分成6组,分别为对照组(A组),H₂O₂损伤组(B组),H₂O₂+100 μmol/L二氮嗪组(C组),H₂O₂+200 μmol/L二氮嗪组(D组),H₂O₂+300 μmol/L二氮嗪组(E组),H₂O₂+400 μmol/L二氮嗪组(F组)。A组细胞不做特殊处理,B组用400 μmol/L双氧水在37℃恒温箱内孵育8 h,C、D、E、F组分别用100、200、300、400 μmol/L的二氮嗪在37℃的恒温箱内预处理30 min,再用400 μmol/L的H₂O₂孵育8 h,用CCK8法检测各组软骨细胞的活性,用流式细胞仪检测各组软骨细胞凋亡情况,用RtPCR检测软骨细胞功能情况,用免疫荧光、Western Blot检测凋亡和内质网应激相关蛋白的表达情况。 结果 ①CCK8法检测各组细胞的活性率从大至小依次为A组> E组> D组> F组> B组;②流式细胞仪检测各组软骨细胞凋亡率由大至小依次为B组> F组>D组> E组> A组;③RtPCR检测软骨细胞二型胶原蛋白(Coll-Ⅱ)、Caspase-3和聚集蛋白聚糖酶(aggrecanase)表达量,表达量大至小依次为A组> E组> D组> F组> B组;各组聚集蛋白聚糖酶表达量大至小依次为B组> F组> D组> E组> A组;④免疫荧光检测软骨细胞中CHOP蛋白的表达量,各组表达量依次是B组> F组> A组;⑤Western bolt检测各组软骨细胞中Caspase-3、Bax、CHOP蛋白的表达情况,表达量依次为B组> F组> A组。 结论 二氮嗪通过抑制内质网应激作用,从而减少H₂O₂诱导的大鼠软骨细胞的凋亡。 

Diazoxide prevents rat chondrocyte apoptosis via Inhibition of endoplasmic reticulum stress

Objective To research the mechanism of diazoxide on hydrogen peroxide induced chondrocyte apoptosis. Methods We obtain the carilage cells from the 3 SD rat articular cartilages. The cartilage cells were divided into six groups, namely the control group(A), the H₂O₂-injured group(B), H₂O₂ + 100 μmol/L DZ group(C), H₂O₂ + 200 μmol/L DZ group(D), H₂O₂ + 300 μmol/L DZ group(E), H₂O₂ + 400 μmol/L(F). Group A had no special treatment, group B incubated with 400 μmol/L H₂O₂ for 8 hours in 37℃ incubator, the C, D, E group were pre-incubated with 100, 200, 300, 400 μmol/L DZ in a 37℃ incubator incubated 30 minutes, then incubated with 400 μmol/L H₂O₂ solution in 37℃ incubator. The activity of chondrocytes in group A, B, C, D, E and F were detected by CCK8 method. The apoptosis of chondrocytes were detected by flow cytometry. The function of chondrocytes were detected by RT-PCR and immunofluorescence, Western blot were used to detect the expression of endoplasmic reticulum stress proteins. Results ①Using the CCK8 assay, the order of the rate of cells activity:group A > group E > group D > group F > group B. ②The apoptosis rates of cells were detected by Flow cytometer. The order of apoptosis rates of chondrocyte as follow:group B > group F > group D > group E > group A. ③The Coll-Ⅱ protein expression of chondrocyte were detected by RTPCR analysis, as follow:group A > group E > group D > group F > group B. However, the aggrecanase expression Contrary to Coll-Ⅱ. ④the expression of CHOP in each chondrocytes group detected by immunofluorescence, as follow:group B > group F > group A. ⑤The Caspase-3, Bax, CHOP protein expression of chondrocyte were detected by Westernblot analysis, as follow:group B > group F > group A. Conclusion Diazoxide prevents H₂O₂-induced rat chondrocyte apoptosis via inhibition of endoplasmic reticulum stress.