透骨消痛胶囊及其拆方对退变软骨细胞Wnt/β-catenin信号通路的影响

BACKGROUND: Previous studies have showed that Tougu Xiaotong Capsule (TGXTC) exerts better effects on osteoarthritis, by regulating Rho/Rock signaling pathway, inhibiting signal transduction of chondrocyte mitochondrial apoptosis pathway, varying the rate and pattern of subchondral bone remodeling and improving the arrangement of subchondral bone collagen fibers and calcium-phosphate crystallization. OBJECTIVE: To observe the effects of the serum containing TGXTC and its disassembled recipes on chondrocyte degeneration of rats via Wnt/β-catenin signal pathway, and to explore the main therapeutic method for osteoarthritis in the TGXTC. METHODS:Forty Sprague-Dawley rats were randomly assigned to receive the treatment of TGXTC, Bushen Rougan (BSRG), Huoxue Qufeng (HXQF) and normal saline, respectively, according to the dose conversion methods of animal to animal and animal to human. Then various drug-containing serums were prepared for the following cellular experiment. After culture and passage, chondrocytes from Sprague-Dawley rats at passage 3 were divided into five groups: blank control, model, TGXTC, BSRG, HXQF groups. Cells in the latter four groups were cultured in appropriate drug-containing serums (normal saline serum for the model group) for 72 hours, following intervention with interleukin-1β for 24 hours. Cells in the blank control group were cultured in normal saline serum. Afterwards, cells in all the five groups were collected for detecting expression of Wnt 4, β-catenin and matrix metalloproteinase 13 at mRNA and protein levels using real-time PCR and western blot assay, respectively. RESULTS AND CONCLUSION: Compared with the blank control group, the expression of Wnt 4, β-catenin, matrix metalloproteinase 13 was significantly increased in the model group. Compared with the model group, the expression of Wnt 4, β-catenin, matrix metalloproteinase 13 in the TGXTC, BSRG and HXQF groups were decreased significantly, sequenced as TGXTC group < BSRG group < HXQF group. These results indicate that TGXTC plays a synergistic protection against interleukin-1β induced degeneration of chondrocytes. In addition, BSRG as a disassembled recipe of TGXTC is the main therapeutic method for osteoarthritis. 中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程     

Wnt/β-连环蛋白信号通路在骨关节炎发生过程中的作用**

背景：研究表明经典Wnt/β-连环蛋白信号通路与骨关节炎的发生发展有重要联系,Wnt蛋白家族、β-连环蛋白以及相关抑制因子可以调节软骨细胞功能和代谢。 目的：综述Wnt/β-连环蛋白信号通路与骨关节炎的关系。 方法：通过计算机检索 CNKI 和Elsevier数据库中2000/2011文献,关键词为“Wnt/β-catenin,OA,骨关节炎,软骨细胞”。选择与Wnt/β-连环蛋白信号通路对骨关节炎影响有关的文章内容。 结果与结论：目前研究表明经典Wnt/β-连环蛋白信号通路是维持关节完整性,调节关节软骨代谢的重要途径之一,对骨关节炎有重要影响。Wnt信号通路以及下游信号OPG/RANKL/RANK通过调节和控制关节软骨代谢,引发骨关节炎疾病,但具体机制有待进一步研究。研究Wnt通路的组分及其作用,不仅有助于骨关节炎的特定治疗,而且有利于预防骨质疏松及其他关节性疾病。 关键词：软骨代谢;Wnt/β-连环蛋白;信号通路;骨关节炎;软骨细胞 doi:10.3969/j.issn.1673-8225.2012.13.029     

透骨消痛胶囊对凋亡软骨细胞Rac1和Cdc42表达的影响CSCD

背景:透骨消痛胶囊治疗早、中期骨性关节炎有较好疗效,但作用机制尚未完全阐明。小GTP酶Rho能够抑制软骨细胞肥大分化,促进软骨细胞的凋亡。目的:观察透骨消痛胶囊对体外培养凋亡大鼠关节软骨细胞Rac1和Cdc42的影响,并初步探讨其防治骨性关节炎的作用机制。方法:采用4周龄SD大鼠膝关节软骨建立稳定的软骨细胞体外培养体系,采用甲苯胺蓝染色法对第3代软骨细胞进行鉴定。用20μg/L的肿瘤坏死因子α诱导体外培养软骨细胞的凋亡,诱导成功后,给予透骨消痛胶囊(500,100,20 mg/L)孵育24 h后,分别用MTT法检测各组软骨细胞的存活率,用流式细胞仪检测各组软骨细胞的线粒体膜电位情况,Western Blot检测各组软骨细胞Rac1,Cdc42,Bcl-2及Bax蛋白表达。结果与结论:透骨消痛胶囊能够减少肿瘤坏死因子α所致的软骨细胞凋亡,提高线粒体膜电位,提高细胞的存活率,同时能够下调Rac1,Cdc42,Bax蛋白的表达,上调Bcl-2蛋白表达,差异均有显著性意义(P<0.05)。提示透骨消痛胶囊可能通过下调Rac1,Cdc42和Bax蛋白表达,增加凋亡抑制基因Bcl-2蛋白表达,从而抑制软骨细胞的凋亡,而起到治疗骨性关节炎的疗效。     

PI3K/Akt信号通路应力与应激对β-连环蛋白及骨代谢的共刺激

背景：运动时应力作用于人体,且同时伴有应激产生,Wnt/β-连环蛋白(β-catenin)信号通路对应力刺激敏感,通过中间途径环氧化酶2/前列腺素E2调节下游促红细胞生成素/RANKL/RANK信号从而影响骨代谢。白细胞介素6是通过非受体型的酪氨酸激酶/信号传递转录激活蛋白信号通路途径,同样影响骨代谢。 目的：探讨应力和应激是否在同一信号途径上对β-连环蛋白的共刺激效应。 方法：由第一作者于2000/2011通过计算机检索 CNKI、HighWire和Elsevier数据库中关于“应力刺激,应激,Wnt/β-连环蛋白,磷脂酰肌醇-3激酶/丝/苏氨酸蛋白激酶,骨代谢”的相关文献。选择与应力刺激或应激对信号通路的影响有关文章内容,共纳入37篇文章。 结果与结论：环氧化酶2/前列腺素E2作为对应力敏感的Wnt/β-连环蛋白信号通路的中间信号,协同应激产生的白细胞介素6,通过对PI3K/Akt途径的激活作用,使β-连环蛋白信号级联放大,并对促红细胞生成素/RANKL/RANK骨吸收信号的调节作用进一步加强,可以解释过度训练导致骨损伤易感性发生的机制,同时也验证了应力与应激在信号通路中的协同刺激作用。     

Wnt/β-catenin信号通路对子宫内膜间质细胞的调节机制

BACKGROUND: Increasing number of genes and signaling pathways are involved in regulating stem cells periodically, and wherein Wnt/β-catenin signaling pathway is an important pathway of stem cells. OBJECTIVE: To investigate the effects of Wnt/β-catenin signal pathway on mouse endometrial stromal cells. METHODS: After injection of Wnt/β-catenin pathway inhibitor or activator, endometrial tissues from Balb/c mice were obtained, some of which were used for detection of invasion of endometrial stromal cells and western blot detection, and the rest of which were used for preparing animal models of endometriosis followed by immunohistochemical detection. RESULTS AND CONCLUSION: The expression of β-catenin and GSK3β proteins was significantly higher in the activator group than the inhibitor group (P < 0.05). The number of transmembrane cells was significantly higher in the activator group than the inhibitor and control groups (P < 0.05). Immunohistochemical findings showed positive expression of E-cadherin in ectopic endometrial tissues of the inhibitory group, and strongly positive expression of vascular endothelial growth factor in ectopic endometrial tissues of the activator group. These findings indicate that Wnt/β-catenin signaling pathway may cause endometriosis by strengthening ectopic endometrial implantation, invasion and metastasis.       

透骨消痛胶囊含药血清对软骨细胞外基质表达的影响**◆

背景：软骨细胞代谢异常引起细胞外基质降解和修复失衡是骨性关节炎的重要病理变化。透骨消痛胶囊具有补肾柔肝、活血祛风的功效,临床实验证实其对防治骨性关节炎有较好疗效。 目的：观察透骨消痛胶囊含药血清对软骨细胞外基质表达的影响。 方法：取SD大鼠膝关节软骨建立体外培养的软骨细胞,第3代软骨细胞同步化后进行干预。50只SD大鼠抽签法随机分为5组,用药量按照人体与动物药物等效剂量换算,空白组：生理盐水进行灌胃;对照组：壮骨关节丸水溶液灌胃;实验组：透骨消痛胶囊水溶液按0.145,0.290,0.580 mg/(g•d)进行灌胃。各组均连续给药3 d,采血前禁食12 h,末次给药1 h后腹主动脉采血,制备血清。 结果与结论：Ⅱ型胶原免疫组织化学染色可见透骨消痛胶囊实验组Ⅱ型胶原表达强于空白组及对照组;透骨消痛胶囊实验组CollagenⅡ、蛋白聚糖、Aggrecan mRNA基因表达明显升高(P < 0.01),Cathepsin K mRNA基因表达明显降低(P < 0.01)。提示透骨消痛胶囊含药血清能上调软骨细胞CollagenⅡ、蛋白聚糖、Aggrecan mRNA基因表达,下调Cathepsin K mRNA基因表达,促进细胞外基质合成,调控细胞外基质和软骨细胞之间的动态平衡。关键词：透骨消痛胶囊;骨性关节炎;含药血清;软骨细胞;细胞外基质 doi:10.3969/j.issn.1673-8225.2012.21.004     

白细胞介素1β对软骨细胞miR-27b和基质金属蛋白酶13蛋白表达的影响

BACKGROUND: Matrix metalloproteinase-13 is most active in the degradation of collagen type II in the extracellular matrix of cartilage. Interleukin-1 (IL-1) is thought to be the inducer of matrix metalloproteinases, and participates in the degradation and degeneration of articular cartilage. OBJECTIVE: To study the influence of IL-1β on microRNA-27b (miR-27b) and matrix metalloproteinase-13 expression of chondrocytes in rats. METHODS: Chondrocytes isolated from seven male Wistar rats were cultured and divided into IL-1β stimulation group and control group. No stimulus was given in the control group; 10 μg/L of serum free medium was used to culture rat chondrocytes in the IL-1β stimulation group. Cell growth was observed at 0, 24, and 48 hours under an inverted microscope. miR-27b and matrix metalloproteinase-13 expression in the cultured chondrocytes were detected. RESULTS AND CONCLUSION:The relative expression of matrix metalloproteinase-13 in rat chondrocytes was gradually increased when induced by IL-1β at 0, 24, and 48 hours (P < 0.05). Expression of miR-27b and miR-31 in rat chondrocytes at 24 and 48 hours induced by IL-1β gradually decreased (P < 0.05); conversely, expression of MiR-26a, miR-26b, miR-23, and miR-204 gradually increased (P < 0.05). After 48 hours of IL-1β induction, expression of miR-27b was the lowest in rat chondrocytes (P < 0.05). These findings suggest that IL-1β inhibits miR-27b expression, strengthens the expression of matrix metalloproteinase-13, and damages chondrocytes, contributing to both the onset and progression of osteoarthritis. 中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程     

Wnt/β-连环蛋白信号通路负调节蛋白SOST在类风湿关节炎中的研究进展

类风湿关节炎(rheumatoid arthritis, RA)作为一种慢性全身性的自身免疫性疾病,以滑膜炎症和增生、局灶性骨侵蚀及关节软骨变薄为特征,最终导致严重的关节损伤和残疾。Wnt/β-连环蛋白(β-catenin)信号通路被认为是成人骨和软骨内稳态的关键调节器,能够影响成骨细胞和破骨细胞的产生及功能,对骨量的调控非常关键。经典Wnt信号通路受到多种细胞因子的调节,其中硬化蛋白(sclerostin, SOST)作为该通路的内源性负调节蛋白,可通过抑制该通路的转导影响新骨形成。该文对SOST结构、作用机制及其对RA的影响进行综述,旨在探讨Wnt/β-连环蛋白/SOST在RA发病机制中的调控作用,为临床治疗RA提供更好的方案。     

透骨消痛颗粒含药血清诱导骨髓基质干细胞向软骨细胞分化

背景：骨髓基质干细胞根据环境而有不同的分化路径,在特定的环境中有分化为透明软骨细胞的趋势,可能为治疗骨性关节炎提供新思路。 目的：观察透骨消痛颗粒含药血清对骨髓基质干细胞向软骨分化的影响。 方法：取SD大鼠四肢建立体外培养的骨髓基质干细胞,取第3代骨髓基质干细胞进行干预,分为生理盐水血清组、透骨消痛颗粒水提物血清组、透骨消痛颗粒醇提物血清组、诱导软骨剂组、透骨消痛颗粒水提物血清+诱导软骨剂组、透骨消痛颗粒醇提物血清+诱导软骨剂组。Real time PCR及Western Blot检测Sox9、collagen Ⅱ、collagen Ⅹ mRNA及蛋白表达。 结果与结论：含药血清干预14 d后,Sox9、 collagen Ⅱ、collagen Ⅹ mRNA及蛋白表达水平,透骨消痛颗粒水提物血清组、透骨消痛颗粒醇提物血清组、诱导软骨组、透骨消痛颗粒水提物血清+诱导软骨剂组、透骨消痛颗粒醇提物血清+诱导软骨剂组明显高于生理盐水血清组(P < 0.05,P< 0.01),诱导软骨组、透骨消痛颗粒水提物血清+诱导软骨剂组、透骨消痛颗粒醇提物血清+诱导软骨剂组明显高于透骨消痛颗粒水提物血清组、透骨消痛颗粒醇提物血清组(P < 0.01),其中Sox9表达透骨消痛颗粒水提物血清+诱导软骨剂组高于诱导软骨。说明透骨消痛颗粒含药血清通过上调Sox9的表达,加速骨髓基质干细胞细胞向软骨细胞分化。     

Wnt/β-catenin信号通路调控哮喘气道重塑的机制研究

目的:探讨Wnt/β-catenin信号通路调控哮喘气道平滑肌细胞(ASMC)的功能和参与哮喘气道重塑的机制。方法:建立大鼠哮喘模型,提取大鼠ASMC。Western blot法检测哮喘组和正常组大鼠ASMC中β-连环蛋白(β-catenin)、糖原合成酶激酶-3β(GSK-3β)、原癌基因c-Myc和细胞周期蛋白D1(cyclin D1)的蛋白表达。抑制哮喘组和对照组ASMC中β-catenin和转录辅助因子p300/CBP间的相互作用后,采用CCK-8法和流式细胞术检测ASMC的细胞活力和周期变化。抑制P38丝裂原活化蛋白激酶(MAPK)活性后,采用Western blot法检测c-Myc和cyclin D1的蛋白表达变化。结果:Western blot法显示哮喘组ASMC中β-catenin、c-Myc和cyclin D1的蛋白表达水平均明显高于对照组(P0.05),同时GSK-3β的蛋白表达水平则低于对照组(P0.05)。抑制β-catenin和p300/CBP间相互作用后,哮喘组ASMC的细胞活力下降幅度和细胞周期改变程度均较对照组更为明显(P0.05)。抑制P38 MAPK活性后,哮喘模型大鼠及对照大鼠ASMC中Wnt/β-catenin信号通路的靶蛋白c-Myc和cyclin D1的表达均下调,差异有统计学意义(P0.05)。结论:Wnt/β-catenin信号通路可能通过上调c-Myc和cyclin D1的表达、与P38 MAPK信号通路相互作用以及调控ASMC的生长和分化等途径,影响ASMC的功能,参与哮喘气道重塑。     

流体切应力对成骨细胞Wnt/β-连锁蛋白信号转导通路的影响

背景：力学刺激对Wnt/β-连锁蛋白信号转导通路对成骨细胞的分化,增殖和凋亡有重要作用。Wnt/β-连锁蛋白信号转导通路的影响是近年来研究的热点。 目的：探讨流体切应力对Wnt/β-连锁蛋白信号转导通路的影响在促进骨细胞骨形成和修复中的作用。 方法：应用计算机检索CNKI 期刊全文数据库和PubMed数据库(1990-01/2009-12)与流体切应力对成骨细胞Wnt/β-连锁蛋白信号转导通路影响有关的文章,纳入43篇符合标准的文献进行综述。 结果与结论：力学负荷刺激Wnt/β-连锁蛋白信号转导通路可提高LRP5 G171V鼠骨细胞骨形成敏感性,导致骨量增多,密度增大。体内和体外力学实验都支持Wnt/β-连锁蛋白信号转导通路是力学刺激的正常反应通路,Wnt/β-连锁蛋白信号转导通路在力学刺激作用下能提高成骨或骨细胞的成骨敏感性。     

Wnt/β-catenin通路在动脉粥样硬化发生发展中的作用

Atherosclerosis is a multifactorial process associated with endothelial cell injury and dysfunction, inflammation, oxidative stress, cell proliferation, angiogenesis and so on, all of which play a crucial role in atherosclerosis. Wnt/β-catenin signaling pathway is highly conservative in the development of body, abnormal activation of which is related to types of diseases including cancer. Accumulating studies have shown that Wnt/β-catenin signaling pathway is involved in inflammation, oxidative stress and so on. This article would make a review about the role of Wnt/β-catenin signaling pathway in atherosclerosis based on the pathogenic mechanisms underlying atherosclerosis as mentioned above.     

阿伐他汀激活wnt/β-catenin信号通路促进骨质疏松模型大鼠移植物的骨整合

BACKGROUND: Atorvastatin has been shown to reduce bone loss and fracture, but its effects on implant osseointegration remain unknown. OBJECTIVE: To investigate the effects of atorvastatin on implant osseointegration in osteoporotic rats and the underlying mechanisms. METHODS: Forty-eight Sprague-Dawley rats were randomized into sham-surgery, ovariectomy, and atorvastatin (10 and 20 mg/kg per day) treatment groups, respectively. All rats received ovariectomy and implant surgery except those in the sham-surgery group. Bone mineral density of the lumbar vertebra, osseointegration ratio and pull-out strength of implants were measured after 12-week treatment. Levels of bone formation and resorption markers in osteoblasts treated with atorvastatin were determined by ELISA. Wnt pathway-related gene expression was detected by RT-PCR. RESULTS AND CONCLUSION: Bone mineral density, osseointegration ratio and pull-out strength of implants were significantly increased in 20 mg/kg per day of atorvastatin treatment group compared with ovariectomy group (P < 0.05). Levels of alkaline phosphatase, osteocalcin and osteoprotegerin were significantly increased in osteoblasts treated with atorvastatin in vitro (P < 0 .05), and the level of osteoclast differentiation factor RANKL was significantly inhibited (P < 0.05). Meanwhile, atorvastatin significantly promoted the mRNA expression of low-density lipoprotein associated protein 5 and β-catenin, and inhibited the mRNA expression of dickkopf Wnt signal pathway inhibitor 1 and sclerostin. Our results suggest that atorvastatin promotes implant osseointegration in osteoporotic rats by activating Wnt/β-catenin signal pathway. 中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程     

糖尿病溃疡中Wnt/β-catenin信号通路表达的变化

目的:观察糖尿病(DM)溃疡中Wnt/β-catenin信号通路表达的变化,探讨该信号通路在糖尿病难愈性溃疡中的作用。方法:雌性Wistar大鼠采用高脂高糖饲料联合小剂量链脲佐菌素液腹腔注射法制备糖尿病模型。分别取正常对照组与DM组制作溃疡模型。观察创面造模后第3天、第7天和第14天对照组及DM组创面愈合情况的变化,并采用HE染色法检测创面组织形态结构的变化,采用ELISA法和RT-PCR法检测创面组织中β-catenin、GSK-3β和Rspo-3蛋白及mRNA的变化。结果:DM组大鼠的创面愈合率明显低于对照组(P0.05),且与对照组相比,其创面组织中含有较少的炎性细胞、纤维母细胞及新生毛细血管。DM组大鼠创面组织中β-catenin和Rspo-3蛋白及mRNA的表达水平均低于对照组,GSK-3β蛋白及mRNA的表达水平均高于对照组(P0.05)。结论:Wnt/β-catenin通路的下调有可能导致了糖尿病溃疡的难愈,而该通路的下调可能源自于Rspo-3蛋白表达的下降。     

Zeste基因增强子同源物2通过调控Wnt/β-catenin信号通路影响脑胶质瘤细胞凋亡

目的:探讨zeste基因增强子同源物2(EZH2)通过调控Wnt/β-catenin信号通路对脑胶质瘤细胞凋亡的影响。方法:以RT-q PCR和Western blot检测胶质瘤U87、H4和U251细胞及正常人脑星形细胞(NHA)中EZH2的表达水平。在H4细胞中转染EZH2 siRNA和siRNA control,MTT测定细胞活力,流式细胞术测定细胞凋亡,分光光度计法检测caspase-3的活性,Western blot检测Wnt/β-catenin信号通路中关键蛋白β-连环蛋白(β-catenin)和下游靶分子c-Myc的蛋白表达。用Wnt/β-catenin信号通路激活剂处理转染EZH2 siRNA的H4细胞,流式细胞术测定细胞凋亡,Western blot测定β-catenin和c-Myc的表达。结果:胶质瘤U87、H4和U251细胞中EZH2的mRNA和蛋白水平均明显高于NHA(P0.05),并且H4细胞中EZH2 mRNA和蛋白水平高于U87和U251细胞(P0.05)。EZH2 siRNA可以明显下调H4细胞中EZH2的mRNA和蛋白水平。EZH2表达下调后的H4细胞从48 h开始细胞活力降低,并且细胞凋亡率也明显升高,细胞中caspase-3活性也明显升高(P0.05),同时EZH2表达下调还可以抑制β-catenin和c-Myc的表达。Wnt/β-catenin信号通路的激活剂可以减少EZH2诱导的H4细胞凋亡,降低细胞中caspase-3的活性。结论:EZH2在脑胶质瘤细胞中过度表达,下调其表达可以通过抑制Wnt/β-catenin信号通路的激活而诱导胶质瘤细胞凋亡。     

HDAC1调控Wnt/β-catenin信号通路对乳腺癌细胞凋亡的影响

目的:研究组蛋白脱乙酰酶1(HDAC1)对乳腺癌细胞凋亡的影响及机制。方法:RT-qPCR和Western blot法分别测定正常乳腺上皮细胞系MCF-10A和乳腺癌细胞系BT549、MCF-7和MDA-MB-231中HDAC1的m RNA和蛋白水平。在MDA-MB-231细胞中转染HDAC1 si RNA,RT-qPCR和Western blot测定HDAC1的表达水平,MTT法测定细胞活力,流式细胞术测定凋亡,Western blot测定细胞中β-连环蛋白(β-catenin)、c-Myc、细胞周期蛋白D1(cyclin D1)和cleaved caspase-3的蛋白水平。用Wnt/β-catenin信号通路激活剂处理下调HDAC1表达后的乳腺癌细胞,测定细胞活力和凋亡。结果:乳腺癌细胞系BT549、MCF-7和MDA-MB-231中HDAC1的m RNA和蛋白水平均明显高于正常乳腺上皮细胞系MCF-10A(P 0. 01),并且MDA-MB-231细胞中的HDAC1水平最高。HDAC1 si RNA可以降低乳腺癌细胞中HDAC1的m RNA和蛋白水平。敲减HDAC1表达后的MDA-MB-231细胞活力降低,细胞凋亡率升高,细胞中cleaved caspase-3水平升高,β-catenin、c-Myc和cyclin D1的蛋白水平降低(P 0. 05)。Wnt/β-catenin信号通路激活剂可以逆转HDAC1下调诱导的MDA-MB-231细胞凋亡和细胞活力降低,减少cleaved caspase-3的水平(P 0. 05)。结论:敲减HDAC1的表达可以通过抑制Wnt/β-catenin信号通路的激活诱导乳腺癌细胞凋亡。     

胡桃醌通过调节Wnt/β-catenin/Snail通路抑制前列腺癌细胞上皮-间充质转化

目的:探讨胡桃醌对人前列腺癌细胞上皮-间充质转化的抑制作用及其机制。方法:培养人前列腺癌LNCaP细胞,实验设置对照组(无胡桃醌)、12. 5μmol/L胡桃醌组和25μmol/L胡桃醌组,后2组用胡桃醌作用LNCaP细胞24 h。采用Transwell实验检测细胞侵袭能力; Western blot实验检测上皮钙黏蛋白(E-cadherin)、波形蛋白(vimentin)、β-连环蛋白(β-catenin)和Snail的蛋白表达水平;使用LiC l和胡桃醌联合作用LNCaP细胞后,Western blot实验检测Snail和E-cadherin的蛋白表达。结果:Transwell实验结果表明,与对照组相比,胡桃醌作用LNCaP细胞后侵袭能力下降(P 0. 01)。Western blot的结果表明,胡桃醌作用LNCaP细胞后E-cadherin的蛋白表达升高,vimentin和Snail及细胞核中β-catenin蛋白的表达降低(P 0. 01)。与胡桃醌组比较,胡桃醌与LiC l联合作用LNCaP细胞后Snail蛋白表达升高,E-cadherin蛋白表达降低(P 0. 01)。结论:胡桃醌可能通过抑制Wnt/β-catenin/Snail信号通路而抑制LNCaP细胞上皮-间充质转化。     

乙型肝炎病毒X蛋白截短突变体的构建及其对Wnt/β-catenin信号通路转录活性的影响

 目的：观察乙型肝炎病毒X蛋白（HBx）截短突变体在细胞内的定位及其对Wnt/β-catenin信号通路转录活性的影响。方法：采用PCR克隆全长野生型HBx基因,在此基础上,分别构建融合增强型绿色荧光蛋白（EGFP）基因和缺失HBx基因C端49~154 aa、C端85~154 aa、N端1~57 aa + C端141~154 aa、N端1~57 aa或N端1~84 aa截短突变体的表达载体;激光共聚焦显微镜下观察HBx截短突变体在HEK293细胞中的定位;采用萤光素酶报告系统检测HBx截短突变体对Wnt/β-catenin信号通路转录活性的影响。结果：（1）成功构建了HBx截短突变体与EGFP基因融合的表达载体。（2）野生型HBx及截短突变体在HEK293细胞中具有不同的定位,其中N端缺失突变体主要定位于细胞核周胞质;C端缺失突变体在胞质胞核中呈均匀分布;N端+C端缺失突变体的定位类似于野生型HBx,主要定位于胞质,呈不均一的粗大颗粒,胞核中也有少量表达。（3）与野生型HBx相比,HBx C端49~154 aa、C端85~154 aa、N端1~57 aa + C端141~154 aa、N端1~57 aa和N端1~84 aa缺失突变体在Huh7细胞中均使Wnt/β-catenin信号通路的转录活性明显下降,分别下降了78.7%、84.7%、75.7%、93.8%和95.5%。结论：HBx不同截短突变体的细胞定位及对Wnt/β-catenin信号通路转录活性不同,提示HBx的不同功能区对Wnt信号的转录激活发挥着不同的作用。