血小板源性生长因子BB对体外培养肌腱细胞增殖的影响

Objective To study the effect of platelet-derived growth factor-BB (PDGF-BB) in dif-ferent concentrations on proliferation of tendon cells cultured in vitro. Methods Rat tendon cells were cultured and identified in vitro. The rat tendon cells were cultured in PDGF-BB nutrient solution in different concentrations. They were then divided into 1, 5, 10, 20, 50, 100, 150, 200, 250 ng/mL PDGF-BB groups (cultured with 0.1 mL 0.5% PBS with addition of 1, 5, 10, 20, 50, 100, 150, 200, 250 ng/mL PDGF-BB respectively). Tendon cells in control group were cultured with 0.1 mL 0.5% FBS. Proliferation of tendon cells was detected by MTT test. The absorbance values of tendon cells in control group and 20 ng/mL PDGF-BB group before culture and after cultured for 12, 24, 36, 48, 60, 72 hs were determined. Results The isolated cells were identified to be rat tendon cells as they were Type Ⅰ collagen staining posi-tive and Type Ⅲ collagen staining negative. Compared with that of control group, the absorbance values of other groups were all increased, except for that of 250 ng/mL PDGF-BB group (P<0.05 or P<0.01). Besides, the absorbance value rose gradually with the increase of the concentration of PDGF-BB on, and then diminished gradually with the increase of the concentration of PDGF-BB from 20 ng/mL on. Tendon cells in 20 ng/ml PDGF-BB group began to increase in number when cultured for 12 hs, and it reached the highest level (0.53±0.04) at 48 h, which were obviously higher than those of control group at 24-72 h (P<0.01). The absorbance value of tendon cells in 20 ng/mL PDGF-BB group was significantly higher than that of control group at 24, 36, 48, 60, 72 h after culture (P<0.01 ). Conclusions PDGF-BB can promote the proliferation of tendon cells in a definite range of concentration and time.     

转化生长因子-β1对人胚肌腱细胞增殖和胶原及内源性Smads基因表达的影响

目的 探讨转化生长因子（TGF）－β1对人胚腱细胞增殖和代谢及其下游信号分子Smad的影响。方法 采用^3H－胸腺嘧啶脱氧核苷和^3H-脯氨酸掺入法观察TGF－β1对人胚腱细胞的DNA和胶原合成的影响。采用半定量反转录聚－合酶链反应（RT－PCR）检测TGF－β1作用24h肌腱细胞Smad2、3和7mRNA表达水平的变化。结果 在体积分数为0．5％胎牛血清条件下TGF－β1可刺激腱细胞增殖,其作用在0．5－10．0μg/L之间呈剂量依赖性增强（P＜0．05）,饱和剂量10μg/L增加DNA合成73％。TGF－β1各剂量组对胶原蛋白合成均有促进作用（P＜0．05）,最大效应剂量为5μg/L（107％）。TGF－β1能显著下调Smad2和Smad3基因的表达水平,同时诱导TGF－β1信号拮抗因子Smad7的产生。结论 TGF－β1能有效促进腱细胞增殖及胶原合成,同时能对其细胞内信号分子Smad的表达起自身调控作用。     

转化生长因子-β1对肌腱腱鞘、腱外膜和腱内膜细胞增殖和胶原产生的影响

目的 探讨兔屈趾肌腱腱鞘、腱外膜和腱内膜细胞增殖、胶原产生和转化生长因子（TGF）-β1对细胞的增殖和胶原产生的影响。方法 从兔屈趾肌腱分离腱鞘、腱外膜和腱内膜细胞并培养，在使用TGF-β1培养后，细胞的数量和胶原产生量被测量，并与不使用TGF-β1培养的对照组比较。另外，通过逆转录-聚合酶链反应（RT-PCR）测定使用TGF-β1前后各种细胞Ⅰ型胶原基因的表达。结果 所有3种细胞均可以产生Ⅰ、Ⅱ、Ⅲ型胶原组织，TGF-β1使培养的细胞数量降低，但能显著性地增加Ⅰ、Ⅱ、Ⅲ型胶原组织产生和Ⅰ型胶原基因的表达（P〈0．05）。结论 调节TGF-β1的水平能调节胶原组织的产生，可能为临床上防止肌腱粘连提供新的途径。     

不同浓度碱性成纤维细胞生长因子对体外培养兔肌腱细胞增殖的影响

目的探讨不同浓度的碱性成纤维细胞生长因子(bFGF)对体外培养兔肌腱细胞增殖的影响,并确定促进肌腱细胞增殖的最佳浓度。方法在体外培养第2代兔肌腱细胞的培养液中分别加入不同浓度(0.5、1、2、5、10、20、30、40、50μg/L)的bFGF,继续培养48 h,噻唑蓝(MTT)法染色,在酶联免疫检测仪上测出不同浓度bFGF组光密度(OD)值。结果与对照组OD均值相比:5、10、20、30、40、50μg/L bFGF组差异均有统计学意义(P<0.05);各组OD均值随bFGF浓度的增加,先逐渐增大(5～20μg/L),达到峰值后又逐渐降低(20～50μg/L)。结论 bFGF有明显促肌腱细胞增殖的作用,且与浓度有一定相关性,即促肌腱细胞增殖的起始bFGF浓度为5μg/L,而20μg/L时可达到促肌腱细胞增殖的最佳浓度。     

体外培养人增生性瘢痕成纤维细胞胶原合成及结缔组织生长因子的表达

目的　探讨结缔组织生长因子在人增生性瘢痕发病机制中的作用。方法　体外培养人正常皮肤和增生性瘢痕成纤维细胞 ,通过H3 脯氨酸掺入法检测细胞胶原合成 ,通过免疫细胞化学染色和逆转录聚合酶链反应检测细胞结缔组织生长因子蛋白质和mRNA的表达。结果　和正常皮肤成纤维细胞相比 ,增生性瘢痕成纤维细胞的胶原合成和结缔组织生长因子蛋白质及mRNA的表达均显著增高 (P <0 0 1)。结论　结缔组织生长因子可能在增生性瘢痕纤维化过程中发挥重要促进作用。     

转化生长因子 - β1对肌腱细胞增殖的调控作用

目的：探讨转化生长因子－β1（TGF－β1）对人胚腱细胞增殖的调控作用。方法：采用^3H-TdR掺入法观察TGF-β1人胚腱细胞的DNA合成剂量效应和时间效应;采用流式细胞仪观察TGF－β1对细胞周期及增殖指数PI值（S＋G2M）的影响。结果：在0．5％胎牛血清条件下TGF－β1可刺激腱细胞增殖,其作用在0．5－10ng/ml之间呈剂依赖性增强,当剂量为10ng/ml时,促NDA合成作用达到饱和。10ng/mlTGF-β1作用36h时开始增殖显著,并可持续到72h。细胞周期分析表明：在TGF－β1作用,G0／G1%呈降低趋势,而S％呈升高趋势,反映细胞增殖活力的PI值也呈升高趋势,尤以5ng/ml以上浓度时为显著。结论：TGF－β1可能通过促进腱细胞增殖参与肌腱的修复。     

结缔组织生长因子与病理性瘢痕

病理性瘢痕是以成纤维细胞为主的细胞成分过度增殖和以胶原为主的细胞外基质过度沉积的皮肤纤维化疾病。近年来，越来越多的研究发现病理性瘢痕的纤维化过程与多种生长因子有关。目前普遍认为转化生长因子β1（Transforming Growth Factor，TGF-β1）是促进纤维化发展的最重要的生长因子之一，在随后的研究中，     

结缔组织生长因子反义寡核苷酸对肾小管上皮细胞胶原分泌的影响

目的比较结缔组织生长因子(CTGF)反义寡核苷酸两种导入方法的优缺点,观察CTGF反义寡核苷酸对TGF-β1刺激的肾小管上皮细胞胶原分泌的影响。方法分别用脂质体包裹和未包裹的CTGF反义寡核苷酸(分高剂量和低剂量)处理NRK52E肾小管上皮细胞,观察异硫氰酸荧光素(FITC)荧光标记的反义寡核苷酸的导入情况和细胞的生长状态。采用RT-PCR和Western印迹方法检测CTGF和Ⅰ型胶原的表达。结果脂质体包裹有助于反义寡核苷酸的导入,于6h～9h细胞即出现生长抑制,形态改变。直接导入法反义寡核苷酸进入较慢,在96h内仍未出现明显细胞毒性。直接导入法中,反义寡核苷酸处理48h后,高、低剂量组CTGFmRNA和蛋白大部分受抑,72h时低剂量组CTGF的表达有少量的恢复。TGF-β1刺激能够显著增加Ⅰ型胶原分泌,加入CTGF反义寡核苷酸共同孵育48h,可以大部分取消TGF-β1的作用,而正义和错义的寡核苷酸没有作用。结论反义寡核苷酸直接导入细胞较慢,但仍然能够达到较好的抑制效果,且细胞毒性小,可以用于体外反义技术的研究。CTGF反义寡核苷酸能够抑制TGF-β1引起的肾小管上皮细胞胶原Ⅰ型分泌增多,表明阻断CTGF可能是延缓肾间质纤维化的有效手段。     

抗结缔组织生长因子小分子干扰RNA设计、合成及活性鉴定

目的设计、合成及筛选高效抗肝纤维化关键基因--结缔组织生长因子(CTGF)的小分子干扰RNA(siRNA).方法应用RNA设计软件,模拟SD大鼠CTGF mRNA二级结构,设计并合成针对CTGF mRNA 483、885及946位点的三对21核苷酸(nt)siRNA,转染肝星状细胞系(HSC T6),以空白及转染非特异siRNA(与CTGF mRNA无同源性的21nt siRNA)作为对照,应用逆转录-聚合酶链反应(RT-PCR)检测HSC T6细胞CTGF mRNA表达.结果与对照相比,转染siRNA的HSC T6细胞CTGF mRNA明显下调,在50～200nmol/L范围,CTGF mRNA下调幅度呈浓度依赖性增加,以483 siRNA 200nmol/L最显著,转染非特异siRNA的HSC T6细胞CTGF mRNA表达水平无明显变化.转染483 siRNA的HSC T6细胞24、48及72 h CTGF mRNA分别较对照下调91%&#177;2%、65%&#177;3%(t=78.82,37.53,P均＜0.01)和10%&#177;7%(t=2.55,P=0.06),在24～72 h范围,CTGF mRNA下调幅度呈时间依赖性降低.结论成功筛选到能高效阻抑CTGF表达的483 siRNA,其有效阻抑时间约72 h,有望通过介导CTGF mRNA剪切而抑制肝纤维化的发生与发展,可发展为新一代防治肝纤维化的核酸药物.     

转化生长因子-β对人肾小球系膜细胞结缔组织生长因子及细胞外基质成分表达的影响

目的:探讨转化生长因子-β(TGF-β)对人肾小球系膜细胞(HMCs)结缔组织生长因子(CTGF)及细胞外基质(ECM)成分表达的影响.方法:应用逆转录-聚合酶链反应(RT-PCR)和蛋白印迹技术,观察不同时间TGF-β1对HMCs CTGF mRNA及其蛋白质表达的影响,同时观察对Ⅰ型胶原、Ⅳ型胶原和纤维结合蛋白(FN)mRNA表达的影响.结果:在正常培养情况下,HMCs有CTGF mRNA及其蛋白质的表达.HMCs在TGF-β1刺激后,CTGFmRNA表达明显增加,6 h达到高峰,可持续增高到24 h;CTGF蛋白表达12 h达到高峰,可持续增高至24 h.Ⅰ型胶原、Ⅳ型胶原mRNA表达逐渐增加,24 h明显增加并达到高峰.FN mRNA12 h达到高峰,24 h后开始回落.结论:HMCs可表达CTGF.TGF-β可诱导体外培养的HMCsCTGF及ECM成分高表达.     

腺相关病毒载体介导结缔组织生长因子对体外转染恒河猴和人腰椎间盘细胞蛋白多糖和Ⅱ型胶原影响的比较

目的比较腺相关病毒载体介导结缔组织生长因子（connective tissue growth factor,CTGF）对体外培养的恒河猴和人腰椎间盘细胞转染后蛋白多糖含量和Ⅱ型胶原的影响。方法将恒河猴及成人腰椎间盘髓核细胞进行体外培养,应用rAAV2-CTGF体外转染细胞,分别通过^35S标记蛋白多糖的方法和Ⅱ型胶原的SP-ABC免疫组化法检测腺相关病毒载体介导生长因子对椎间盘细胞蛋白多糖合成和Ⅱ型胶原的影响。结果恒河猴椎间盘细胞能进行体外培养并传代,其形态学特性与培养的成人椎间盘细胞相似,rAAV2-CTGF与对照组相比可促进恒河猴和人椎间盘髓核细胞的蛋白多糖生物合成（P〈0．01）,恒河猴和成人相比生长因子对于蛋白多糖的促进作用无明显差异（P〉0．05）。结论成功培养恒河猴及成人椎间盘细胞,腺相关病毒载体介导CTGF能显著促进髓核细胞蛋白多糖的合成,生长因子对恒河猴和人椎间盘细胞蛋白多糖含量的影响具有很大的相似性。     

结缔组织生长因子对Kupffer细胞诱导的肝星状细胞激活的影响

目的 探讨肝星状细胞(hepatic stellate cell,HSC)结缔组织生长因子(connective tissue growth factor,CTGF)表达对Kupffer细胞(Kc)诱导的HSC激活的影响.方法 构建含CTGF的RNA干扰载体.将肝星状细胞系rHSC-99分为3组:对照组、空载体组和RNA干扰组.采用RT-PCR方法 检测HSC的CTGF表达.分离培养KC,建立各组HSC与KC的共培养体系,MTT检测HSC的增殖情况;RT-PCR检测HSC的TGF-β1、I型前胶原的表达;Western Blot检测HSC的TGF-β1表达,ELISA检测共培养上清中I型胶原的表达;免疫荧光化学检测HSC的α-SMA的表达. 结果 构建CTGF的RNA干扰载体Psilencer 3.1H1-Neo-CTGF.RNA干扰后CTGF表达降低22%.KC得率为5×107,活率＞98%.在HSC和KC共培养体系中,RNA干扰HSC的CTGF表达后,与KC共培养的HSC活化和增殖明显被抑制,与对照组相比,HSC的增殖降低29%(t:20.17,P＜0.01).Ⅰ型前胶原和α-SMA的表达下降38%,细胞培养上清中Ⅰ型胶原的分泌量下降48%(t=12.18,t=7.81,t=15.96,均P＜0.05).TGF-β表达则没有明显的变化.结论 阻断HSC的CTGF表达能抑制由KC诱导的HSC激活.     

转化生长因子β1对肾小管上皮细胞中结缔组织生长因子基因启动子活性的影响

目的探讨转化生长因子[β1（TCF-β1）对人近端肾小管上皮细胞系HK-2中结缔组织生长因子（CTGF）基因启动子活性的调控作用，以及丝裂原激活蛋白激酶（MAPK）途径对该生长因子作用的影响。方法构建含有人类CTGF基因启动子的报告基因pCTGF-luc，将其瞬时转染HK-2细胞。通过检测荧光素酶的活性观察TGF-β1和MAPK途径抑制剂对CTGF基因启动子活性的影响。结果TGF-β1以剂量和时间依赖方式上调HK-2中CTGF基因启动子的活性。最佳刺激浓度是5ng／ml，最佳刺激时间为12h，荧光素酶相对活性分别为对照组的1．82倍和2．10倍（P〈0．05）。应用PD98059、SB203580和SP600125分别特异性抑制MAPK途径的胞外信号调节蛋白激酶（ERK）、蛋白激酶p38（p38MAPK）和c-Jun-氨基末端激酶（JNK）通路，对TGF-β1上调CTGF启动子活性的作用有不同影响。PD98059显著增加HK-2中pCTGF-luc的基础活性．并在一定浓度范围内（0．5～10μmol／L）促进TGF-β1的上调作用。SB203580对pCTGF-luc基础活性无影响，但以剂量依赖方式显著抑制TGF-β1的激活效应。而SP600125对基础状态和TGF-β1刺激下CTGF基因启动子活性无影响。结论TGF-β1以剂量和时间依赖方式上调HK-2中CTGF基因启动子活性，在转录水平调节CTGF表达。MAPK途径的ERK和p38MAPK通路可影响TGF-β1的这一调控作用。     

结缔组织生长因子影响体外培养瘢痕成纤维细胞ERK／MAPK信号通路活化及增殖的研究

目的探讨结缔组织生长因子（connective tissue growth factor,CTGF）诱导增生性瘢痕（hypertrophic scar,HS）成纤维细胞增殖的信号转导通路。方法采用。H-胸腺嘧啶核苷（^3H—TdR）掺入法观察不同浓度CTGF促HS成纤维细胞增殖的效应,以Western印迹法检测CTGF刺激HS成纤维细胞0、5、10、15、30、60min后,磷酸化及非磷酸化细胞外信号调节激酶1／2（extracellular-signal regulated kinase,ERK1／2）的表达,以两者的比值AI衡量信号通路活化程度;应用特异性阻断剂PD98059阻断ERK通路,MTT法检测CTGF诱导细胞增殖的变化。结果CTGF在一定浓度范围内呈浓度依赖性促HS成纤维细胞增殖,ERK1／2在无CTGF刺激时AI为0．0131±0．0036,CTGF刺激HS成纤维细胞5、10、15、30、60min后,AI值分别为0．0221±0．0033,0．1310±0．0361,0．2090±0．0201,0．1710±0．0379,0．0413±0．0036,在15min达高峰;采用PD98059选择性阻断ERK1／2通路后（A=0．420±0．046）与CTGF刺激组比较（A=0．660±0．035）,细胞增殖显著受到抑制（P〈0．01）。结论ERK1／2是CTGF诱导HS成纤维细胞增殖的主要活化的信号通路。     

结缔组织生长因子通过ERK1/2途径刺激肾脏成肌纤维细胞增殖和Ⅰ型胶原生成

目的 观察结缔组织生长因子（CTGF）对大鼠肾脏成肌纤维细胞增殖及细胞外基质（ECM）成分Ⅰ型胶原生成的影响，并探讨ERK1/2途径在其中的作用。 方法 原代培养肾皮质成肌纤维细胞，应用5’-溴-2’-脱氧尿嘧啶（BrdU） 掺入法和细胞计数法检测细胞增殖；Western印迹法检测细胞上清液中Ⅰ型胶原的蛋白水平及细胞内ERK1/2的磷酸化水平。 结果 CTGF明显促进成肌纤维细胞的增殖，呈时间和剂量依赖性，100 μg/L组第4天时，细胞数为对照组的1.6倍（P < 0.05）。CTGF刺激可显著增加培养上清液中Ⅰ型胶原的蛋白水平 [为对照组的（2.6±1.2）倍， P < 0.05]。CTGF刺激细胞5 min后ERK1/2即发生磷酸化，持续至15 min， 30 min以后迅速降至基础水平。用ERK1/2阻断剂PD98059预处理30 min后，CTGF促进细胞增殖效应（7%±5%比85%±7%， P < 0.01）和促Ⅰ型胶原分泌作用（1.0±0.1比1.6±0.3, P < 0.05）被显著抑制。 结论 CTGF能够促进成肌纤维细胞的增殖和Ⅰ型胶原的分泌，其作用可能通过ERK1/2信号通路实现。     

结缔组织生长因子促进半月板无血管区损伤愈合

目的：探讨结缔组织生长因子（CTGF）对纤维软骨细胞外基质分泌、VEGF表达及促进半月板无血管区的损伤修复中的作用。方法：将新西兰大白兔半月板白区,经胶原酶消化、离心分离后,提取半月板纤维软骨细胞,培养至第2代。用流式细胞仪鉴定该细胞表面CD31,CD44,CD45和CD105标志物,并用Ⅱ型胶原抗体做免疫细胞化学鉴定,以证明所培养、传代的细胞是纤维软骨细胞。分别将细胞培养在浓度100 ng/ml的CTGF培养基中3、14 d后,通过实时定量聚合酶链反应,检测Ⅰ型胶原、Ⅱ型胶原和VEGF基因的表达变化情况。造模,在兔半月板中央区,制作长3 mm的纵行撕裂。将45只大白兔随机分为3组,处理方式为：半月板单纯缝合术,缝合术加填充PBS-纤维蛋白胶,缝合术加填充1．5滋g CTGF-纤维蛋白胶。术后第1、4、10周用荧光免疫组织化学分析法显示Ⅰ型、Ⅱ型胶原和VEGF在损伤处的表达与分布情况,直观撕裂处的愈合情况。结果：体外实验第14天,定量RT-PCR结果显示,100 ng/ml CTGF组中的Ⅰ型、Ⅱ型胶原和VEGF mRNA表达比PBS对照组,明显增加。体内实验的荧光免疫组织化学结果显示,在术后第10周,CTGF治疗组中的Ⅰ型、Ⅱ型胶原和VEGF已完全填充撕裂损伤处。 PBS-蛋白胶组中,损伤处仍有明显裂隙。结论：CTGF可促进半月板无血管区重要的细胞外基质（Ⅰ型、Ⅱ型胶原）的合成,同时损伤处VEGF的表达活性明显增强,有利于促进无血管区半月板撕裂损伤的愈合。     

结缔组织生长因子影响体外培养瘢痕成纤维细胞ERK/MAPK信号通路活化及增殖的研究

Objective To explore the signal mechanism of proliferation stimulating effect of connec-tive tissue growth factor (CTGF) on hypertrophic scar (HS) derived fibroblasts. Methods <'3>H-TdR in-corporation technique was used to determine the proliferative effect of CTGF at different concentration. Western blot was applied to semi-quantitively analyze the expression of phosphorylated and total ERK1/2 protein after 0, 5, 10, 15, 30, and 60 min of CTGF stimulation, and the relative value of which was de-fined as AI to measure the activation of ERK1/2 signal pathway. PD98059 was admitted to specifically block the ERK1/2 pathway, and subsequently cell proliferation stimulated by CTGF was studied by MTT. Results CTGF could stimulate fibroblasts proliferation with a dose-dependant manner, and activa-ted the ERK1/2 signal pathway, and AI built up to 0.209±0.0201, reaching the apex at 15 min after stimulation performed. Inhibition of ERK1/2 activation by PD98059 suppressed CTGF-mediated HS fi-broblasts proliferation significantly, while OD significantly dropped. Conclusion CTGF induces a prolif-erative response in HS fibroblasts, and this action is mainly dependent on the activation of ERK1/2 signal pathway.     

结缔组织生长因子影响体外培养瘢痕成纤维细胞ERK/MAPK信号通路活化及增殖的研究

Objective To explore the signal mechanism of proliferation stimulating effect of connec-tive tissue growth factor (CTGF) on hypertrophic scar (HS) derived fibroblasts. Methods <'3>H-TdR in-corporation technique was used to determine the proliferative effect of CTGF at different concentration. Western blot was applied to semi-quantitively analyze the expression of phosphorylated and total ERK1/2 protein after 0, 5, 10, 15, 30, and 60 min of CTGF stimulation, and the relative value of which was de-fined as AI to measure the activation of ERK1/2 signal pathway. PD98059 was admitted to specifically block the ERK1/2 pathway, and subsequently cell proliferation stimulated by CTGF was studied by MTT. Results CTGF could stimulate fibroblasts proliferation with a dose-dependant manner, and activa-ted the ERK1/2 signal pathway, and AI built up to 0.209±0.0201, reaching the apex at 15 min after stimulation performed. Inhibition of ERK1/2 activation by PD98059 suppressed CTGF-mediated HS fi-broblasts proliferation significantly, while OD significantly dropped. Conclusion CTGF induces a prolif-erative response in HS fibroblasts, and this action is mainly dependent on the activation of ERK1/2 signal pathway.     

结缔组织生长因子影响体外培养瘢痕成纤维细胞ERK/MAPK信号通路活化及增殖的研究

Objective To explore the signal mechanism of proliferation stimulating effect of connec-tive tissue growth factor (CTGF) on hypertrophic scar (HS) derived fibroblasts. Methods <'3>H-TdR in-corporation technique was used to determine the proliferative effect of CTGF at different concentration. Western blot was applied to semi-quantitively analyze the expression of phosphorylated and total ERK1/2 protein after 0, 5, 10, 15, 30, and 60 min of CTGF stimulation, and the relative value of which was de-fined as AI to measure the activation of ERK1/2 signal pathway. PD98059 was admitted to specifically block the ERK1/2 pathway, and subsequently cell proliferation stimulated by CTGF was studied by MTT. Results CTGF could stimulate fibroblasts proliferation with a dose-dependant manner, and activa-ted the ERK1/2 signal pathway, and AI built up to 0.209±0.0201, reaching the apex at 15 min after stimulation performed. Inhibition of ERK1/2 activation by PD98059 suppressed CTGF-mediated HS fi-broblasts proliferation significantly, while OD significantly dropped. Conclusion CTGF induces a prolif-erative response in HS fibroblasts, and this action is mainly dependent on the activation of ERK1/2 signal pathway.     

结缔组织生长因子影响体外培养瘢痕成纤维细胞ERK/MAPK信号通路活化及增殖的研究

Objective To explore the signal mechanism of proliferation stimulating effect of connec-tive tissue growth factor (CTGF) on hypertrophic scar (HS) derived fibroblasts. Methods <'3>H-TdR in-corporation technique was used to determine the proliferative effect of CTGF at different concentration. Western blot was applied to semi-quantitively analyze the expression of phosphorylated and total ERK1/2 protein after 0, 5, 10, 15, 30, and 60 min of CTGF stimulation, and the relative value of which was de-fined as AI to measure the activation of ERK1/2 signal pathway. PD98059 was admitted to specifically block the ERK1/2 pathway, and subsequently cell proliferation stimulated by CTGF was studied by MTT. Results CTGF could stimulate fibroblasts proliferation with a dose-dependant manner, and activa-ted the ERK1/2 signal pathway, and AI built up to 0.209±0.0201, reaching the apex at 15 min after stimulation performed. Inhibition of ERK1/2 activation by PD98059 suppressed CTGF-mediated HS fi-broblasts proliferation significantly, while OD significantly dropped. Conclusion CTGF induces a prolif-erative response in HS fibroblasts, and this action is mainly dependent on the activation of ERK1/2 signal pathway.