Protein Expression in Silica Dust-induced Transdifferentiated Rats Lung Fibroblasts

Objective To analyze the expression of different proteins in free silica-induced transdifferentiated rat lung fibroblasts.Methods Rat lung fibroblasts and alveolar macrophages were cultured.A transdifferentiation model of rat lung fibroblasts was established.Free silica was used as a stimulator for rat lung fibroblasts.Changes in α-SMA were detected by immunohistochemistry and Western blot,respectively.Protein of lung fibroblasts was extracted and analyzed by two-dimensional electrophoresis(2-DE).Results Six protein spots were identified by mass spectrometry,including glyceraldehyde 3-phosphate-dehydrogenase,peroxiredoxin 5,heterogeneous nuclear ribonucleoprotein A2,transgelin 2,keratin K6 and vimentin.Conclusion Some proteins are changed in free silica-induced transdifferentiaed rat lung fibroblasts.     

Protective Effect of Angiotensin(1-7) on Silicotic Fibrosis in Rats

Objective Silicosis, caused by inhalation of silica dust, is the most serious occupational disease in China and the aim of present study was to explore the protective effect of Ang (1-7) on silicotic fibrosis and myofibroblast differentiation induced by Ang Ⅱ. Methods HOPE-MED 8050 exposure control apparatus was used to establish the rat silicosis model. Pathological changes and collagen deposition of the lung tissue were examined by H.E. and VG staining, respectively. The localizations of ACE2 and a-smooth muscle actin (a-SMA) in the lung were detected by immunohistochemistry. Expression levels of collagen type Ⅰ, a-SMA, ACE2, and Mas in the lung tissue and fibroblasts were examined by western blot. Levels of ACE2, Ang (1-7), and Ang Ⅱ in serum were determined by ELISA. Co-localization of ACE2 and a-SMA in fibroblasts was detected by immunofluorescenee. Results Ang (1-7) induced pathological changes and enhanced collagen deposition in vivo. Ang (1-7) decreased the expressions of collagen type Ⅰ and a-SMA and increased the expressions of ACE2 and Mas in the silicotic rat lung tissue and fibroblasts stimulated by Ang Ⅱ. Ang (1-7) in creased the levels of ACE2 and Ang (1-7) and decreased the level of Ang Ⅱ in silicotic rat serum. A779 enhanced the protective effect of Ang (1-7) in fibroblasts stimulated by Ang Ⅱ. Conclusion Ang (1-7) exerted protective effect on silicotic fibrosis and myofibroblast differentiation induced by Ang Ⅱ by regulating ACE2-Ang (l-7)-Mas axis.     

细胞直接共培养模型在大鼠肺成纤维细胞转分化中的应用

目的:探讨细胞直接共培养模型在大鼠肺成纤维细胞转分化研究中的应用价值。方法:分离SD大鼠肺巨噬细胞和成纤维细胞,采用ThinCertTM进行共培养,并分为4组:对照组加入无SiO2粉尘的培养基,SiO2低、中、高剂量处理组分别加入终质量浓度为25、50和100mg/L的SiO2粉尘悬液,培养24h后,收集成纤维细胞和培养上清,分别采用real-time PCR检测成纤维细胞中α-平滑肌肌动蛋白(α-SMA)、Ⅰ型胶原(COLⅠ)及Ⅲ型胶原(COLⅢ)的mRNA水平,ELISA法测定培养上清中α-SMA、COLⅠ和COLⅢ蛋白。结果:SiO2处理组的α-SMA、COLⅠ和COLⅢmRNA和蛋白的表达水平明显高于对照组,且随SiO2质量浓度的升高,α-SMA、COLⅠ和COLⅢmRNA和蛋白的表达水平有升高的趋势(P<0.05)。结论:细胞直接共培养模型可用于大鼠肺成纤维细胞转分化的研究。     

Roles of Rho/Rock Signaling Pathway in Silica-induced Epithelial-mesenchymal Transition in Human Bronchial Epithelial Cells

ObjectiveTo investigate the roles of Rho/Rock signaling pathway in silica-induced Epithelial-mesenchymal transition (EMT) in human bronchial epithelial cells (BEC) in vitro.MethodsHuman BEC were incubated with silica with various concentrations for indicated times. Cell viability was assayed by MTT test. Morphologic Changes were observed by microscope. Mesenchymal marker α-smooth muscle actin (α-SMA), vimentin (Vim), and epithelial marker E-cadherin (E-cad) were analyzed by Western Blot. The pull-down assay was used to measure Rho activity. In the prevention experiments, the specific inhibitor for Rho effector ROCK (Y27632) was used to inhibit the activity of Rho.ResultsHuman BEC stimulated with silica were converted from a “cobblestone” epithelial structure into an elongated fibroblast-like shape structure. Incubation of human BEC with silica induced de novo expression of α-SMA and Vim, and loss of E-cad. Also, silica treatment resulted in Rho activation in human BEC. Y27632 up-regulated the E-cad expression but attenuated α-SMA and Vim expression in silica-stimulated cells.ConclusionThe activation of Rho/ROCK signaling pathways is most likely involved in Silica-induced EMT in human bronchial epithelial cells.     

趋化因子CXCL12可能参与白细胞介素17A对小鼠肺成纤维细胞的活化

目的: 研究IL-17A促进小鼠肺成纤维细胞活化及趋化因子CXCL12在其中的作用。方法: 以雄性BALB/c小鼠为研究对象,小鼠腹腔注射重组小鼠IL-17A后取小鼠肺组织。采用实时逆转录PCR和蛋白质印迹法检测小鼠肺组织α平滑肌肌动蛋白（α-SMA）和Ⅰ型胶原蛋白的mRNA和蛋白表达,采用免疫组织化学法和实时逆转录PCR法测定肺组织中趋化因子CXCL12的表达。分离培养正常小鼠原代肺成纤维细胞,采用免疫荧光染色法和光学显微镜观察鉴定原代肺成纤维细胞。将分离的肺成纤维细胞与不同浓度的重组小鼠IL-17A共培养后收集细胞及上清液,采用实时逆转录PCR法测定细胞中α-SMA、Ⅰ型胶原蛋白和CXCL12的mRNA水平,采用ELISA法测定培养上清液中Ⅰ型胶原蛋白和CXCL12蛋白水平。结果: 与对照组比较,重组小鼠IL-17A处理后小鼠肺组织中α-SMA、Ⅰ型胶原蛋白的mRNA和蛋白水平均升高（均P < 0.01）。与不同浓度的重组小鼠IL-17A共培养后,小鼠肺成纤维细胞表达α-SMA、Ⅰ型胶原蛋白和CXCL12的mRNA明显增加（均P < 0.01）,其培养基上清液中Ⅰ型胶原蛋白、CXCL12的浓度也明显升高（均P < 0.01）,且呈剂量依赖性。结论: IL-17A能促进肺成纤维细胞的活化并转化为肌成纤维细胞,分泌Ⅰ型胶原蛋白明显增加,促进细胞外基质的沉积,从而导致肺纤维化的发生和发展,而活化的成纤维细胞分泌的趋化因子CXCL12可能参与了这个过程。     

JAK-STAT通路参与CTGF诱导人胚肺成纤维细胞转分化的研究

目的研究JAK-STAT信号通路在重组人结缔组织生长因子(recombinant human,CTGF)诱导人胚肺成纤维细胞(HFL-I)转分化过程中的作用。方法将体外培养的HFL-I分为正常对照组、CTGF组及CTGF+JAK-STAT特异性抑制剂通路抑制剂AG490组,选取不同时相点,Western blotting测定平滑肌肌动蛋白(α-smooth muscle actin,α-SMA)、磷酸化蛋白(p-STAT3)和总蛋白STAT3的蛋白表达,RT-PCR检测STAT3 mRNA表达。结果正常体外培养的HFL-I有微量的p-STAT3、α-SMA表达,加入20ng/ml CTGF诱导15min后p-STAT3水平明显升高(P<0.05),30min时升至顶峰后逐渐减弱;诱导24h后α-SMA表达显著升高(P<0.05)。AG490 50μmol/L预处理60min,p-STAT3和α-SMA表达明显抑制(P<0.05或P<0.01)。结论 CTGF诱导HFL-I转分化为肌成纤维细胞,JAK-STAT通路参与上述过程,其特异性抑制剂AG490可有效抑制该效应。     

转录因子T-bet/GATA-3诱导哮喘模型中α-SMA和Ⅰ型胶原高表达的实验研究

目的观察大鼠肺转录因子T细胞表达的T盒(T-bet)/GATA连接蛋白-3 (GATA3)对肺支气管α-平滑肌动蛋白(α-SMA)和Ⅰ型胶原的调解作用,探讨其比率与哮喘早期气道重塑的关系。方法将大鼠随机分为OVA组即哮喘模型组、生理盐水组、空白对照组。采用实时定量-聚合酶链反应法检测大鼠肺组织中T-bet mRNA和GATA-3 mRNA表达,免疫印迹法检测大鼠肺组织中T-bet和GATA-3蛋白表达;免疫组化法测定大鼠肺组织中α-SMA表达水平,酶联免疫吸附法测定成纤维细胞（LF）中Ⅰ型胶原表达强度;比较T-bet/GATA-3与α-SMA和Ⅰ型胶原的关系。结果OVA组大鼠肺组织中T-bet mRNA和蛋白表达强度均较生理盐水组和空白对照组显著减弱;而OVA组GATA 3 mRNA和蛋白表达强度较其余两组显著增强;T-bet/GATA-3比率较其余两组显著减弱;OVA组肺组织α-SMA和LF中Ⅰ型胶原含量较其余两组显著增强;T-bet/GATA-3比率与α-SMA和Ⅰ型胶原均成负相关。结论 T-bet/GATA-3比率与哮喘早期气道重塑的指标α-平滑肌动蛋白(α-SMA)和Ⅰ型胶原等呈线性负相关,T-bet/GATA-3失衡可能是哮喘早期气道重塑的重要原因之一。     

靶向沉默SIRT1对乳鼠心肌成纤维细胞增殖的影响

目的 探究沉默信息调节因子1(SIRT1)对乳鼠心肌成纤维细胞增殖的影响作用.方法 应用转化生长因子-β1处理乳鼠原代心肌成纤维细胞,采用实时荧光定量聚合酶链反应(qRT-PCR)法检测SIRT1、α-平滑肌肌动蛋白(α-SMA)的mRNA表达水平;Western blot法检测SIRT1、α-SMA的蛋白表达水平;MTT法检测心肌成纤维细胞的细胞增殖活性;使用LipofectamineTM 2000 Reagent向乳鼠原代心肌成纤维细胞中转染siRNA-SIRT1.结果 转染siRNA-SIRT1的心肌成纤维细胞,SIRT1蛋白和mRNA 表达下降,同时α-SMA蛋白和mRNA表达下降;转染siRNA-SIRT1明显抑制心肌成纤维细胞的增殖活性.结论 siRNA-SIRT1对心肌成纤维细胞增殖活性有明显抑制作用,SIRT1可能成为心脏结构重构防治的新靶点,其调控剂的应用将为心肌纤维化的防治提供新的思路和方案.     

Notch1在TGF-β1诱导心肌成纤维细胞向肌成纤维细胞转化中的作用

目的：研究转化生长因子β1（TGF-β1）诱导心肌成纤维细胞（CFs）向肌成纤维细胞（MFB）转分化过程中Notch1的变化情况,探讨在此转分化过程中Notch1的可能作用.方法：体外分离培养CFs,以10μg/LTGF-β1诱导CFs向MFB转分化.实验分为对照组,TGF-β1作用24,48,72h组,采用消化法测定羟脯氨酸（HYP）含量;免疫荧光、免疫印迹法测定α-平滑肌肌动蛋白（α-SMA）表达;实时定量PCR、免疫印迹法测定Notch1 mRNA及蛋白表达.利用γ分泌酶抑制剂DAPT（75μmol/L）阻断Notch1受体活化.实验分对照组,DAPT作用24,48,72h组,检测SMA及胶原的表达变化.结果：TGF-β1作用后,与对照组相比较α-SMA,HYP表达量随TGF-β1诱导时间的增加呈上升趋势,而Notch1则呈下降趋势,均以72h最显著（P〈0.01）;加入DAPT后,与对照组相比较α-SMA,HYP表达量随DAPT作用时间增加呈上升趋势,以72h最显著（P〈0.01）.结论：TGF-β1可以诱导CFs向MFB转分化,Notch1在此过程中的表达呈下降趋势,而DAPT阻断Notch1活化后可以促进CFs向MFB转分化.     

阿托伐他汀对TGF-β1诱导的大鼠肺成纤维细胞分化的影响

【目的】观察阿托伐他汀对肺纤维化大鼠的肺成纤维细胞增殖的影响及其对TGF-β1诱导的大鼠肺成纤维细胞表型分化的影响。【方法】建立Wistar大鼠肺纤维化模型,1周后取肺组织进行成纤维细胞原代培养,细胞经鉴定后以不同浓度的阿托伐他汀对试验组细胞进行干预,采用MTT法测定细胞增殖情况;TGF-β1诱导细胞分化,同时给予不同浓度阿托伐他汀干预,免疫细胞化学染色（SP）法检测药物对肌成纤维标志物-αSMA表达的影响。【结果】MTT结果显示：各剂量组中不同干预天数所测得的OD值之间存在显著差异（P〈0.01）。各时间点所测OD值与不同用药物剂量之间存在交互作用（P〈0.01）。各剂量组对细胞的抑制作用之间存在显著差别（P〈0.01）。免疫细胞化学染色结果显示：药物因素对-αSMA的表达量有影响（P〈0.01）,区组因素对-αSMA的表达量有影响（P〈0.01）。【结论】阿托伐他汀可抑制肺纤维化大鼠肺成纤维细胞的增殖,同时可抑制TGF-β1诱导的成纤维细胞的分化,这主要表现在抑制细胞增殖、改变其形态、减少肌成纤维细胞的标志性产物-αSMA的产生上。     

ERK1/2信号通路在Ang-(1-7)抑制AngⅡ诱导的NRK52E转分化中的作用

目的探讨血管紧张素-(1-7)[Ang-(1-7)]对血管紧张素Ⅱ(AngⅡ)诱导的大鼠肾小管上皮细胞(NRK52E)表型转化及ERK1/2信号分子在转分化过程中的作用。方法体外培养NRK52E,经Ang-(1-7)和AngⅡ(终浓度均为10-6mol/L)干预24、48、72、96 h后,应用细胞免疫化学法检测E-cadherin、α-SMA的表达;干预72、96 h后,应用Western blot法检测P-ERK1/2表达水平的变化。结果 AngⅡ作用96 h后,E-cadherin的表达显著减弱(P<0.05),α-SMA的表达显著增强(P<0.05),P-ERK1/2表达显著增强(P<0.05);同时加入Ang-(1-7)后,与AngⅡ组比较,E-cadherin的表达显著增强(P<0.05),α-SMA的表达显著减弱(P<0.05),P-ERK1/2表达显著减弱(P<0.05)。结论 Ang-(1-7)能够抑制AngⅡ诱导的大鼠NRK52E表型转化,ERK1/2信号通路参与了肾小管上皮细胞转分化过程。     

辛伐他汀对大鼠肾小管上皮细胞转分化的作用

目的:观察辛伐他汀对实验性1型糖尿病大鼠肾小管上皮细胞转分化的作用。方法:将实验动物随机分为对照组、糖尿病组及治疗组。治疗组给予辛伐他汀[5 mg/(kg.d)]治疗12周。于实验第6,9,12周检测24 h尿蛋白(24 h TP),12周检测血清肌酐(Scr),内生肌酐清除率(Ccr)和NAG酶。采用免疫组织化学技术检测各组肾小管间质中-αSMA,MCP-1,CD44表达水平。结果:糖尿病大鼠肾组织中-αSMA,MCP-1和CD44表达较对照组明显增加(P<0.01),治疗12周后,辛伐他汀可明显降低1型糖尿病肾病大鼠肾小管间质中-αSMA,MCP-1和CD44表达(P<0.01),并降低蛋白尿(P<0.01),改善肾功能各指标及肾组织病理学损害。-αSMA表达分别与MCP-1,CD44表达及24 hTP呈正相关(r=0.998 5,0.976 3,1.000 0,P<0.01)。结论:辛伐他汀对糖尿病肾小管间质病变具有保护作用,其机制至少部分与抑制肾小管上皮细胞转分化,下调肾小管间质中-αSMA,MCP-1和CD44表达有关。     

靶向沉默HDAC6对乳鼠心房肌成纤维细胞活化增殖的作用

目的 探究组蛋白去乙酰化酶(HDAC6)对乳鼠心房肌成纤维细胞活化增殖的影响作用.方法 将50只乳鼠(雄性)分别提取心房肌成纤维细胞,应用Western blot法测定HDAC6和α-平滑肌肌动蛋白(α-SMA)的表达情况;运用qRT-PCR技术检测HDAC6和α-SMA mRNA的表达情况;MTT法检测心房肌成纤维细胞的细胞增殖活性;使用LipofectamineTM 2000 Reagent向心房肌成纤维细胞中转染小干扰RNA HDAC6(siRNA-HDAC6)后观察对心房肌成纤维细胞增殖的影响.结果 转染心房肌成纤维细胞siRNA-HDAC6组HDAC6和α-SMA的蛋白表达明显下降;qRT-PCR技术检测siRNA-HDAC6组中HDAC6和α-SMA的mRNA表达明显下降;转染siRNA-HDAC6明显抑制心房肌成纤维细胞的增殖活性.结论 靶向沉默HDAC6可抑制心房肌成纤维细胞活化增殖,提示其在心房纤维化中可能发挥调控作用.     

红景天甙对低氧诱导肾小管上皮细胞转分化的作用研究

目的 观察红景天甙(salidroside,Sal)对氯化钴(cobaltous chloride,CoCl_2·6H_2O,Co)诱导的低氧状态下正常大鼠近端肾小管上皮细胞(normal rat kidney tubular epithelia cell,NRK52E)转分化的影响并分析其可能的机制.方法 体外培养NRK52E细胞,分为正常对照组,氯化钴低氧组,10、50、100 μmol/L不同浓度红景天甙组.观察低氧标志蛋白低氧诱导因子-1α(hypoxia inducible foctor-1α,HIF-1α)的表达.倒置相差显微镜观察细胞形态变化;荧光免疫及细胞免疫法检测NRK52E细胞α-平滑肌肌动蛋白(α-smooth muscle actin,α-SMA)表达情况;RT-PCR检测NRK52E细胞α-SMA、转化生长因子-β_1(transforming growth factor-β_1,TGF-β_1)mRNA的表达;Western blot蛋白印迹检测HIF-1α和α-SMA蛋白的表达;酶联免疫吸附法检测细胞上清液胶原Ⅰ(collagen Ⅰ,Col-Ⅰ)和纤维粘连蛋白(fibronectin,FN)的含量.结果 100 μmol/L Co诱导NRK52E细胞表达HIF-1α.Co组细胞明显肥大、拉长,呈肌成纤维细胞外观.不同浓度Sal组细胞形态介于正常与Co组之间.CO组α-SMA基因、蛋白和TGF-β_1 mRNA表达量较对照组升高(P＜0.05),不同浓度Sal组α-SMA基因、蛋白和TGF-β1 mRNA表达量较Co组减少(P＜0.05).Co组细胞上清液Col-Ⅰ和FN的含量较对照组增加(P＜0.05),不同浓度Sal组Col-Ⅰ和FN的含量明显下降(P＜0.05),以高剂量组最为明显.结论 Sal可在一定程度上改善Co诱导的低氧状态和细胞转分化,减少细胞外基质的增加.其机制可能是通过抑制TGF-β_1和HIF-1α的表达实现的.     

PDGF-A/PDGFR-α对系统性硬化症患者皮损成纤维细胞增殖和转分化的作用

目的探讨血小板衍生生长因子A(PDGF-AA)/PDGF受体α(PDGFR-α)信号通路对系统性硬化症(SSc)患者皮损成纤维细胞(FB)增殖和转分化为MFB的作用。方法 SSc患者皮损和正常皮肤原代FB体外培养、鉴定,用免疫细胞化学法检测其中的α-SMA;分别予两组FB不同浓度的PDGF-AA刺激,用MTT法检测其对FB增殖的作用;对两组FB分别予TGF-β1、PDGF-AA及两者联合刺激,用RT-PCR法检测其PDGFR-αmRNA、α-SMA mRNA的表达水平。结果两组FB形态虽相似,但SSc FB中α-SMA呈阳性,正常皮肤则为阴性;SSc FB增殖的饱和浓度高于对照组,在一定浓度与饱和浓度间两组FB都呈剂量依赖方式增殖(P<0.05);不论有无PDGF-AA刺激及刺激浓度大小,SSc FB增殖程度均高于对照组(P<0.05);除单用TGF-β1对正常皮肤FB表达PDGFR-αmRNA无影响外,TGF-β1、PDGF-AA或两者联合刺激均可上调两组FB中PDGFR-αmRNA、α-SMA mRNA的表达水平,以两者联合刺激作用最强;不论有无刺激或何种刺激,SSc FB中PDGFR-αmRNA、α-SMAmRNA表达水平均高于正常皮肤FB(P<0.05);PDGFR-αmRNA和α-SMA mRNA的表达水平依照未处理、PDGF-AA、TGF-β1及TGF-β1+PDGF-AA的顺序渐次增加,两者呈高度正相关(r=0.925,P<0.05)。结论 SSc患者皮损来源的FB存在着向MFB转分化的显著特性,SSc FB胞膜表面过表达的PDGFR-α可结合较多的PDGF-AA配体,从而介导更强的促进FB增殖和转分化为MFB作用,TGF-β1则可增强此作用。     

碱性调宁蛋白在系统性硬化症中的表达及作用

目的研究碱性调宁蛋白（CNN1）在系统性硬化症（SSc）中的表达及其对成纤维细胞的作用。方法收集SSc患者皮肤活 检组织19例,正常人的皮肤活检组织21例。通过Real-time PCR方法检测皮肤组织中CNN1和α-SMA的基因表达;通过免疫组 化方法检测皮肤组织中CNN1的蛋白表达;利用RNA干扰方法降低成纤维细胞中CNN1的基因表达,通过Real-time PCR检测 细胞中CNN1及纤维化相关基因α-SMA、CTGF、COL1A1、COL1A2、COL3A1的mRNA相对表达量;应用细胞实时增殖检测系统 （xCELLigence系统）检测细胞增殖。结果与正常对照相比,SSc患者皮肤组织中CNN1的表达水平显著升高（P<0.05）;皮肤组 织中,CNN1 的表达和α-SMA存在正相关,具有统计学意义（r=0.7219,P<0.0001）;与正常对照组相比,SSc 患者皮肤组织中 CNN1的蛋白表达升高;原代皮肤成纤维细胞中,CNN1的表达和α-SMA、COL1A1均存在正相关,具有统计学意义（r=0.6547,P< 0.05;r=0.6438,P<0.05）;同时,原代皮肤成纤维细胞中干扰CNN1 后,可显著抑制细胞增殖,降低纤维化相关基因（CTGF、 COL1A2 等）表达,降低胶原蛋白的表达。结论CNN1 在SSc 患者中表达升高,且干扰CNN1 可降低成纤维细胞活性,提示 CNN1与SSc纤维化密切相关。     

Crystalline Silica Promotes Rat Fibrocyte Differentiation in Vitro,and Fibrocytes Participate in Silicosis in Vivo

Objective The aim of this study was to investigate the effects of Si O2 on fibrocytes and whether fibrocytes participate in silicosis in vivo. Methods A macrophagocyte(AM)/fibrocyte coculture system was established, and AMs were treated with 100 μg/mL SiO 2. Flow cytometry was used to detect the number of fibrocytes. Real‐time PCR was performed to measure the expression of collagen I, collagen III, and α‐SMA mR NA. The levels of collagen I, collagen III, and TGF‐β1 protein were determined by ELISA. Immunohistochemical staining was performed to measure α‐SMA protein expression. A rat silicosis model was induced by intratracheal instillation of SiO 2. Lung histopathological evaluation was conducted using HE and Masson's trichrome staining after 1 and 9 weeks. The number of fibrocytes in peripheral blood or lung tissue of rat was detected by flow cytometry. Double‐color immunofluorescence was applied to identify fibrocytes in the lung tissue. Results Peripheral blood monocytes were found to differentiate into fibrocytes in vitro in a time‐dependent manner, and exposure to crystalline silica might potentiate fibrocyte differentiation. In addition, fibrocytes were able to migrate from peripheral blood to the lung tissue, and the number of fibrocytes was increased after SiO 2 exposure. Conclusion Silica exposure potentiates fibrocyte differentiation, and fibrocytes may participate in silicosis in vivo.     

大鼠结肠原代成纤维细胞的分离、培养和鉴定

目的：建立简单高效的大鼠结肠成纤维细胞体外原代培养和鉴定方法,为进一步研究结肠纤维化疾病提供细胞模型。方法：取成年雄性Wistar大鼠结肠组织,采用组织块贴壁法进行成纤维细胞体外原代培养,胰酶联合差速组织块贴壁培养法分离成纤维细胞,HE染色观察细胞形态表现,免疫组织化学法观察细胞中波形蛋白（Vimentin）、α平滑肌肌动蛋白（α-SMA）、S100钙结合蛋白A4（S100A4）和E钙黏蛋白（E-cadherin）的表达,并与大鼠胸主动脉平滑肌A7R5细胞对比进行鉴定。结果：结肠组织块贴壁培养8d后成纤维细胞爬出,12d进入增殖时期,15~20d基本长满。倒置显微镜下观察,细胞呈扁平多突的纺锤形或星形;HE染色,成纤维细胞核大,卵圆形,着色浅,核仁明显。免疫组织化学染色,成纤维细胞Vimentin呈阳性表达,α-SMA、S100A4和E-cadherin均呈阴性表达;对照组大鼠胸主动脉平滑肌A7R5细胞S100A4呈阴性表达,α-SMA、Vimentin和E-cadherin均呈阳性表达。结论：采用胰酶联合差速组织块贴壁培养法成功原代培养出大鼠结肠成纤维细胞。     

成纤维细胞激活蛋白在小鼠肺纤维化模型中的表达

目的探讨成纤维细胞激活蛋白（FAP）在实验性小鼠肺纤维化组织中的表达,及其与α平滑肌肌动蛋白（α-SMA）、转化生长因子β1（TGF-β1）之间的相互关系。方法气管内滴入博莱霉素（7mg/kg）制备肺纤维化模型,采用免疫组化技术检测小鼠肺纤维化组织中FAP、α-SMA和TGF-β1的表达。结果正常肺组织无FAP表达;纤维化组FAP表达于细支气管和大血管周围的成纤维细胞,成纤维细胞灶中FAP、α-SMA和TGF-β1表达部位相似,但FAP比α-SMA的表达更广泛,比TGF-β1的表达更强。FAP、α-SMA和TGF-β1与小鼠肺纤维化程度均呈正相关（r值分别为0.795、0.766和0.628,P〈0.01）,且FAP与TGF-β1的表达呈正相关（r=0.706,P〈0.01）。结论 FAP特异性表达在小鼠肺纤维化组织的成纤维细胞灶中,与肺纤维化程度有关。FAP与TGF-β1可能在肺纤维化形成中起协同作用。     

IL-17对肺成纤维细胞的增殖、转化和胶原合成作用

目的探讨IL-17对博来霉素诱导肺纤维化形成中的肺成纤维细胞增殖、转化、胶原合成作用。方法用5 mg/kg博来霉素气管内注入的方法诱导肺纤维化形成,逆转录-聚合酶链反应(RT-PCR)检测IL-17/IL-17RmRNA在肺纤维化形成中表达的变化,选择表达IL-17RmRNA最佳时间的肺成纤维细胞进行原代培养、鉴定。使用四氮唑蓝比色法检测不同浓度的IL-17对肺成纤维细胞的增殖。使用RT-PCR和Western Blotting检测肌成纤维细胞标志物α-SMA以及I和III型胶原的表达。结果(1)IL-17/IL-17RmRNA在肺纤维化形成中明显升高,在第14天表达最高。(2)不同浓度IL-17能够促进肺成纤维细胞的增殖,最佳浓度为50 ng/ml。(3)IL-17促进肺成纤维细胞表达α-SMA增加。(4)IL-17促进肺成纤维细胞I和III型胶原合成。结论 IL-17具有促进小鼠肺纤维化形成中肺成纤维细胞增殖、转化和胶原的合成作用,可能在肺纤维化形成中起重要作用。