摘要
目的 探讨慢病毒介导的agggrecanase-2 shRNA对类风湿关节炎患者软骨细胞aggrecan的影响.方法 术中切取类风湿关节炎患者关节软骨,通过胰酶+Ⅱ型胶原酶两步消化法消化软骨块并培养,取第2~3代软骨细胞.以慢病毒为载体将aggrecanase-2 shRNA5~8转染进入软骨细胞,观察转染后细胞的生长变化;以荧光定量PCR检测转染后第2、5、10天aggrecanase-2 mRNA水平的变化及aggrecan mRNA水平的变化,以循环阈值(cycle threshold,Ct)表示;用免疫组织化学方法检测aggrecan蛋白水平的变化,以积分光密度(integral optical density,IOD)表示,筛选最佳抑制序列.结果 以慢病毒为载体介导aggrecanase-2 shRNA转染软骨细胞后对细胞生长速度及形态无明显影响.加入病毒液200μl、100μl、50μl后感染复数分别为100、50、25,转染效率分别为90%、60%、30%.转染后aggrecanase-2mRNA的表达水平明显下降,特别是mRNA5,由开始的0.876 3±0.115 6下降至0.069 9±0.015 1 (P< 0.05);aggrecan mRNA水平显著上调,由开始的0.992 1±0.201 3增加至3.049 2±0.278 2(P< 0.05);aggrecan蛋白表达水平显著提高,由开始的496.160 5±225.673 7增加至4 525.433 0±1 131.813 0(P<0.05);最佳抑制序列为aggrecanase-2 shRNA5.结论 以慢病毒为载体介导aggrecanase-2shRNA转染骨关节炎患者软骨细胞可有效干扰aggrecanase-2 mRNA表达,相应地增加aggrecan表达,是一种保护aggrecan的有效途径.
Objective To investigate the effects of aggrecanase-2 knockdown in chondrocytes from rheumatoid arthritis patient by shRNA infection.Methods Cartilage harvested from rheumatoid arthritis patients who underwent total knee arthroplasty was digested by pancreatin and type Ⅱ collagen enzyme to obtain chondrocytes.Then chondrocytes were cultured and passaged to second or third generation.After aggrecanase-2 shRNA5,aggrecanase-2 shRNA6,aggrecanase-2 shRNA7,aggrecanase-2 shRNA8 infection,growth and morphological changes of the chondrocytes were examined.To select the best target sequence,mRNA expression of aggrecanase-2 and aggrecan was detected by RT-qPCR assay on day 2,5,10,represented with Ct (Cycle threshold) value.Expression of aggrecan protein was detected by immunocytochemistry,represented with IOD (integral optical density) value.Results aggrecanase-2 knockdown had no obvious effects on the morphology and growth of the chondrocytes.MOI (multiplicity of infection) was 100,50,25,and infection efficiency was 90%,60%,30% with the corresponding viral load of 200 μl,100 μl,50 μl after transfection.mRNA expression of aggrecanase-2 was suppressed significantly,especially the group of shRNA5 which suppressed aggrecanase-2 expression from 0.876 3±0.115 6 to 0.069 9±0.015 1 (P < 0.05).mRNA and protein expression of aggrecan were significantly upregulated after infection.mRNA expression of aggrecan increased from 0.992 1±0.201 3 to 3.049 2±0.278 2 (P < 0.05) and protein expression of aggrecan increased from 496.160 5± 225.673 7 to 4 525.433 0±1 131.813 0 (P < 0.05).Conclusion aggrecanase-2 suppression in chondrocytes by lentivirius infection is an effective method to protect the expression of aggrecan.
出处
《中华骨科杂志》
CAS
CSCD
北大核心
2014年第9期936-944,共9页
Chinese Journal of Orthopaedics
基金
国家自然科学基金(81171774,81272056)