[目的]通过白藜芦醇刺激体外培养的小鼠膝关节软骨细胞,探讨白藜芦醇通过PI3K/Akt信号通路对软骨细胞细胞外基质合成的影响。[方法]体外分离培养小鼠膝关节软骨细胞,采用HE染色、甲苯胺蓝染色和Ⅱ型胶原免疫荧光染色观察鉴定软骨细胞。...[目的]通过白藜芦醇刺激体外培养的小鼠膝关节软骨细胞,探讨白藜芦醇通过PI3K/Akt信号通路对软骨细胞细胞外基质合成的影响。[方法]体外分离培养小鼠膝关节软骨细胞,采用HE染色、甲苯胺蓝染色和Ⅱ型胶原免疫荧光染色观察鉴定软骨细胞。根据作用药物的不同分为3组:空白对照组、白藜芦醇组(100μmol/L白藜芦醇)和LY294002组(100μmol/L白藜芦醇+25μmol/L LY294002)。采用RT-PCR检测软骨细胞中Akt1,Aggrecan、Collagen II的m RNA表达水平。[结果]荧光显微镜下可见软骨细胞胞核呈蓝色荧光,胞质呈红色荧光。显示Ⅱ型胶原染色阳性细胞数占90%以上,证实所培养细胞为软骨细胞。RT-PCR检测结果显示白藜芦醇组Akt1、Aggrecan、Collagen II m RNA表达量较空白组明显升高(P<0.05)。LY294002组Akt1、Aggrecan、Collagen II m RNA表达量较白藜芦醇组下降,但仍高于空白组(P<0.05)。[结论]白藜芦醇可以通过激活PI3K/Akt信号通路,增加软骨细胞细胞外基质合成,起到保护关节软骨的作用。展开更多
This study investigated the effects of SIRT1 gene knock-out on osteoarthritis in mice, and the possible roles of SREBP2 protein and the PI3K/AKT signaling pathway in the effects. Mice were randomly divided into a norm...This study investigated the effects of SIRT1 gene knock-out on osteoarthritis in mice, and the possible roles of SREBP2 protein and the PI3K/AKT signaling pathway in the effects. Mice were randomly divided into a normal group and a SIRT1 gene knock-out group（6 mice in each group）. In these groups, one side of the knee anterior cruciate ligament was traversed, and the ipsilateral medial meniscus was cut to establish an osteoarthritis model of knee joint. The countralateral synovial bursa was cut out, serving as controls. The knee joint specimens were then divided into four groups： SIRT1^（＋/＋） control group（group A, n=6）; SIRT1^（＋/＋） osteoarthritis group（group B, n=6）; SIRT1^（–/–） control group（group C, n=6）; SIRT1^（–/–） osteoarthritis group（group D, n=6）. HE staining, Masson staining, Safranin O-Fast Green staining and Van Gieson staining were used to observe the morphological changes in the articular cartilage of the knee. Immunohistochemical staining was employed to detect the expression of SIRT1, SREBP2, VEGF, AKT, HMGCR and type Ⅱ collagen proteins. SA-β-gal staining was utilized to evaluate chondrocyte aging. The results showed clear knee joint cartilage destruction and degeneration in the SIRT1^（–/–） osteoarthritis group. The tidal line was twisted and displaced anteriorly. Type Ⅱ collagen was destroyed and distributed unevenly. Compared with the SIRT1^（＋/＋） osteoarthritis group and SIRT1^（–/–） control group, SIRT1 protein expression was not obviously changed in the SIRT1^（–/–） osteoarthritis group（P〉0.05）, while the expression levels of the SREBP2, VEGF and HMGCR proteins were significantly increased（P〈0.05） and the levels of AKT and type Ⅱ collagen proteins were significantly decreased（P〈0.05）. SIRT1 gene knock-out may aggravate cartilage degeneration in osteoarthritis by activating the SREBP2 protein-mediated PI3K/AKT signalling pathway, suggesting that SIRT1 gene may play a protective role again展开更多
背景:第10号染色体缺失的磷酸酶及张力蛋白同源基因(phosphatase and tensin homologue deleted on chromosome 10,PTEN)是一种抑癌基因,可以通过调节PI3K/AKT/mTOR等信号通路在细胞增殖凋亡中起到作用。最新研究证实,PTEN可在脊髓损伤...背景:第10号染色体缺失的磷酸酶及张力蛋白同源基因(phosphatase and tensin homologue deleted on chromosome 10,PTEN)是一种抑癌基因,可以通过调节PI3K/AKT/mTOR等信号通路在细胞增殖凋亡中起到作用。最新研究证实,PTEN可在脊髓损伤、周围神经缺损等骨科疾病中起到重要作用,而相关的细胞模型却鲜有报道。目的:构建携载大鼠PTEN基因的慢病毒载体,建立PTEN基因表达降低的RSC96施万细胞系模型。方法:设计大鼠PTEN基因RNAi序列,将其构建并包装成可转染的慢病毒,转染RSC96施万细胞后,通过RT-PCR检测RSC96施万细胞中PTEN基因的表达情况。结果:成功构建病毒滴度为8E+8TU/ml的PTEN-RNAi慢病毒,将其转染RSC9施万细胞后,细胞中PTEN基因的相对表达量为0.2322±0.0187,敲减效率为76.78%,与阴性对照慢病毒转染组(1.0044±0.0022)相比,差异有统计学意义(P<0.01)。结论:成功建立PTEN基因表达降低的RSC96施万细胞系模型,为研究PTEN基因相关的创伤骨科、脊柱外科、手外科疾病提供实验基础。展开更多
背景:沉默信息调节因子1(silent information regulator 1,SIRT1)基因是一个与衰老关系密切的基因,可以通过调节PI3K/AKT、NF-κB等信号通路影响到组织及机体的衰老过程,并参与骨科相关疾病的发生发展。建立慢病毒介导的SIRT1基因表达...背景:沉默信息调节因子1(silent information regulator 1,SIRT1)基因是一个与衰老关系密切的基因,可以通过调节PI3K/AKT、NF-κB等信号通路影响到组织及机体的衰老过程,并参与骨科相关疾病的发生发展。建立慢病毒介导的SIRT1基因表达降低的ATDC5细胞模型,可以为研究SIRT1基因相关的骨科系统疾病如骨关节炎、骨质疏松症等提供实验基础。目的:构建携带小鼠SIRT1基因的RNAi慢病毒载体,将其转染ATDC5细胞系,建立SIRT1基因表达降低的ATDC5细胞模型。方法:根据RNAi序列设计原则设计并合成SIRT1基因的RNAi靶点序列,连接GV248(框架结构:h U6-MCS-Ubiquitin-EGFP-IRES-puromycin)载体,转化后经阳性克隆测序及PCR鉴定,质粒抽提后导入293T细胞,包装慢病毒,取上清检测滴度。将含有小鼠SIRT1基因RNAi的病毒颗粒转染ATDC5细胞系,并于荧光显微镜下进行观察,行RT-PCR检测ATDC5细胞中SIRT1 m RNA的表达情况。结果:经测序、PCR检测可知,SIRT1基因的RNAi靶点序列与GV248载体连接成功,并包装成高滴度的慢病毒。携带小鼠SIRT1基因的RNAi慢病毒感染ATDC5细胞后,荧光显微镜下观察显示感染率较高,RT-PCR检测发现,携带SIRT1基因的慢病毒感染组SIRT1基因m RNA的相对表达量为0.386±0.117,与阴性对照病毒感染组相比有统计学差异(P<0.05),敲减效率为61.4%。结论:成功建立SIRT1基因表达降低的ATDC5细胞模型,为研究SIRT1基因相关骨科系统疾病提供实验基础。展开更多
直接前入路(direct anterior approach,DAA)是一种微创的髋关节手术入路,近年来被广泛应用于全髋关节置换术(total hip arthroplasty,THA)。现有文献表明,DAA应用于人工股骨头置换术可有效保护肌肉、减少术中及术后失血量、减轻术后疼痛...直接前入路(direct anterior approach,DAA)是一种微创的髋关节手术入路,近年来被广泛应用于全髋关节置换术(total hip arthroplasty,THA)。现有文献表明,DAA应用于人工股骨头置换术可有效保护肌肉、减少术中及术后失血量、减轻术后疼痛,促进患者早期下床活动。本文对DAA人工股骨头置换术的临床意义、手术方法、应用效果等方面做一综述,以期为DAA在人工股骨头置换手术中的进一步应用提供理论基础。展开更多
文摘[目的]通过白藜芦醇刺激体外培养的小鼠膝关节软骨细胞,探讨白藜芦醇通过PI3K/Akt信号通路对软骨细胞细胞外基质合成的影响。[方法]体外分离培养小鼠膝关节软骨细胞,采用HE染色、甲苯胺蓝染色和Ⅱ型胶原免疫荧光染色观察鉴定软骨细胞。根据作用药物的不同分为3组:空白对照组、白藜芦醇组(100μmol/L白藜芦醇)和LY294002组(100μmol/L白藜芦醇+25μmol/L LY294002)。采用RT-PCR检测软骨细胞中Akt1,Aggrecan、Collagen II的m RNA表达水平。[结果]荧光显微镜下可见软骨细胞胞核呈蓝色荧光,胞质呈红色荧光。显示Ⅱ型胶原染色阳性细胞数占90%以上,证实所培养细胞为软骨细胞。RT-PCR检测结果显示白藜芦醇组Akt1、Aggrecan、Collagen II m RNA表达量较空白组明显升高(P<0.05)。LY294002组Akt1、Aggrecan、Collagen II m RNA表达量较白藜芦醇组下降,但仍高于空白组(P<0.05)。[结论]白藜芦醇可以通过激活PI3K/Akt信号通路,增加软骨细胞细胞外基质合成,起到保护关节软骨的作用。
基金supported by grants from the National Natural Science Foundation of China(No.81272032)the Research and Development Projects of Shenzhen of China(Nos.JCYJ20150403091443275)
文摘This study investigated the effects of SIRT1 gene knock-out on osteoarthritis in mice, and the possible roles of SREBP2 protein and the PI3K/AKT signaling pathway in the effects. Mice were randomly divided into a normal group and a SIRT1 gene knock-out group（6 mice in each group）. In these groups, one side of the knee anterior cruciate ligament was traversed, and the ipsilateral medial meniscus was cut to establish an osteoarthritis model of knee joint. The countralateral synovial bursa was cut out, serving as controls. The knee joint specimens were then divided into four groups： SIRT1^（＋/＋） control group（group A, n=6）; SIRT1^（＋/＋） osteoarthritis group（group B, n=6）; SIRT1^（–/–） control group（group C, n=6）; SIRT1^（–/–） osteoarthritis group（group D, n=6）. HE staining, Masson staining, Safranin O-Fast Green staining and Van Gieson staining were used to observe the morphological changes in the articular cartilage of the knee. Immunohistochemical staining was employed to detect the expression of SIRT1, SREBP2, VEGF, AKT, HMGCR and type Ⅱ collagen proteins. SA-β-gal staining was utilized to evaluate chondrocyte aging. The results showed clear knee joint cartilage destruction and degeneration in the SIRT1^（–/–） osteoarthritis group. The tidal line was twisted and displaced anteriorly. Type Ⅱ collagen was destroyed and distributed unevenly. Compared with the SIRT1^（＋/＋） osteoarthritis group and SIRT1^（–/–） control group, SIRT1 protein expression was not obviously changed in the SIRT1^（–/–） osteoarthritis group（P〉0.05）, while the expression levels of the SREBP2, VEGF and HMGCR proteins were significantly increased（P〈0.05） and the levels of AKT and type Ⅱ collagen proteins were significantly decreased（P〈0.05）. SIRT1 gene knock-out may aggravate cartilage degeneration in osteoarthritis by activating the SREBP2 protein-mediated PI3K/AKT signalling pathway, suggesting that SIRT1 gene may play a protective role again
文摘背景:第10号染色体缺失的磷酸酶及张力蛋白同源基因(phosphatase and tensin homologue deleted on chromosome 10,PTEN)是一种抑癌基因,可以通过调节PI3K/AKT/mTOR等信号通路在细胞增殖凋亡中起到作用。最新研究证实,PTEN可在脊髓损伤、周围神经缺损等骨科疾病中起到重要作用,而相关的细胞模型却鲜有报道。目的:构建携载大鼠PTEN基因的慢病毒载体,建立PTEN基因表达降低的RSC96施万细胞系模型。方法:设计大鼠PTEN基因RNAi序列,将其构建并包装成可转染的慢病毒,转染RSC96施万细胞后,通过RT-PCR检测RSC96施万细胞中PTEN基因的表达情况。结果:成功构建病毒滴度为8E+8TU/ml的PTEN-RNAi慢病毒,将其转染RSC9施万细胞后,细胞中PTEN基因的相对表达量为0.2322±0.0187,敲减效率为76.78%,与阴性对照慢病毒转染组(1.0044±0.0022)相比,差异有统计学意义(P<0.01)。结论:成功建立PTEN基因表达降低的RSC96施万细胞系模型,为研究PTEN基因相关的创伤骨科、脊柱外科、手外科疾病提供实验基础。
文摘背景:沉默信息调节因子1(silent information regulator 1,SIRT1)基因是一个与衰老关系密切的基因,可以通过调节PI3K/AKT、NF-κB等信号通路影响到组织及机体的衰老过程,并参与骨科相关疾病的发生发展。建立慢病毒介导的SIRT1基因表达降低的ATDC5细胞模型,可以为研究SIRT1基因相关的骨科系统疾病如骨关节炎、骨质疏松症等提供实验基础。目的:构建携带小鼠SIRT1基因的RNAi慢病毒载体,将其转染ATDC5细胞系,建立SIRT1基因表达降低的ATDC5细胞模型。方法:根据RNAi序列设计原则设计并合成SIRT1基因的RNAi靶点序列,连接GV248(框架结构:h U6-MCS-Ubiquitin-EGFP-IRES-puromycin)载体,转化后经阳性克隆测序及PCR鉴定,质粒抽提后导入293T细胞,包装慢病毒,取上清检测滴度。将含有小鼠SIRT1基因RNAi的病毒颗粒转染ATDC5细胞系,并于荧光显微镜下进行观察,行RT-PCR检测ATDC5细胞中SIRT1 m RNA的表达情况。结果:经测序、PCR检测可知,SIRT1基因的RNAi靶点序列与GV248载体连接成功,并包装成高滴度的慢病毒。携带小鼠SIRT1基因的RNAi慢病毒感染ATDC5细胞后,荧光显微镜下观察显示感染率较高,RT-PCR检测发现,携带SIRT1基因的慢病毒感染组SIRT1基因m RNA的相对表达量为0.386±0.117,与阴性对照病毒感染组相比有统计学差异(P<0.05),敲减效率为61.4%。结论:成功建立SIRT1基因表达降低的ATDC5细胞模型,为研究SIRT1基因相关骨科系统疾病提供实验基础。
文摘直接前入路(direct anterior approach,DAA)是一种微创的髋关节手术入路,近年来被广泛应用于全髋关节置换术(total hip arthroplasty,THA)。现有文献表明,DAA应用于人工股骨头置换术可有效保护肌肉、减少术中及术后失血量、减轻术后疼痛,促进患者早期下床活动。本文对DAA人工股骨头置换术的临床意义、手术方法、应用效果等方面做一综述,以期为DAA在人工股骨头置换手术中的进一步应用提供理论基础。
