SB203580对肝纤维化大鼠肝脏Ⅰ、Ⅲ型胶原蛋白表达的影响

目的:探讨SB203580对肝纤维化大鼠肝脏Ⅰ、Ⅲ型胶原蛋白表达的影响.方法:将32只♀SD大鼠分为4组:正常组(N组)8只、肝纤维化组(HF组)8只、DMSO溶剂干预组(D组)8只、P38MAPK抑制剂SB203580干预组(SB组)8只.采用四氯化碳复合因素法复制肝纤维化模型,肝纤维化模型制作结束后,D组给予2‰DMSO溶液3 mL/(kg?d),SB组给予SB203580溶液10 mg/(kg?d),N组、HF组给予同等剂量0.9%生理盐水3 mL/(kg?d)腹腔注射,连续注射4 d.干预结束后,宰杀大鼠留取肝脏,行肝组织病理切片HE染色评价肝纤维化分期,行Masson染色观察胶原纤维沉积情况,采用SP免疫组织化学法检测肝脏Ⅰ、Ⅲ型胶原蛋白表达,应用逆转录PCR法检测肝脏中Ⅰ、Ⅲ型胶原mRNA表达.结果:正常对照组(N组)、肝纤维化组(H F组)、S B203580溶剂组(D M S O组)和P38MAPK通路特异性抑制剂组(SB203580组)的肝纤维化分期平均秩分别为4.50、22.50、24.00和15.00;SSS评分分别为2.750±0.707、15.875±0.835、16.000±0.926和11.625±0.9 1 6;Ⅰ型胶原显色指数分别为1.5 7 5±0.249、7.650±0.621、7.725±0.501和4.625±0.495;Ⅲ型胶原显色指数分别为2.375±0.518、4.025±0.446、4.075±0.544和3.375±0.167;Ⅰ型胶原mRNA表达分别为0.020±0.003、0.012±0.002、0.009±0.002和0.016±0.005;Ⅲ型胶原mRNA表达分别为0.412±0.772、0.773±0.137、0.799±0.116和0.572±0.862.HF组与N组相比,Ⅰ、Ⅲ型胶原及其mRNA表达升高(均P<0.001),与肝纤维化分期结果一致(P<0.001);D组与HF组无明显差异(均P>0.05);SB组与HF组相比,Ⅰ、Ⅲ型胶原表达降低(Ⅰ型胶原显色指数P<0.001,Ⅲ型胶原显色指数P=0.041);Ⅰ型胶原mRNA表达降低(P=0.005),同时Ⅲ型胶原mRNA表达亦降低(P=0.005),肝纤维化分期下降(P=0.015).结论:P38MAPK抑制剂SB203580阻断P38MAPK通路具有降低肝脏Ⅰ、Ⅲ型胶原表达的作用,能够延缓肝纤维化的发生发展.     

334例晚期血吸虫病超声检查与血清肝纤维化指标对照分析

目的 超声检查血吸虫性肝纤维化与血清学肝纤维化指标是否具有相关性.方法 对334例晚期血吸虫病进行超声肝纤维化分级、门脉内径、腹水与血清透明质酸(HA)、层粘连蛋白(LN)、Ⅲ型前胶原(PC-Ⅲ),Ⅳ型胶原蛋白(Ⅳ-C)指标检查.结果 超声检查的客观指标与血清学肝纤维化指标呈正相关.结论 超声检查能反映肝纤维化严重程度...     

肝脂汤对酒精性肝硬化大鼠模型肝纤维化的影响

制作酒精性肝硬化大鼠模型，给予肝脂汤治疗4周。治疗前后检测层粘连蛋白、Ⅲ型前胶原、透明质酸、Ⅳ型胶原的变化情况，并对肝组织进行病理学检查。结果4周后肝脂汤治疗组肝纤维化指标不同程度下降，其中层粘连蛋白、Ⅳ型胶原显著下降（P均〈0.05）；肝脂汤治疗组肝脏病理学变化程度较模型组显著下降（P〈0.05）。认为肝脂汤治疗酒精性肝硬化有效，具有一定的临床应用价值。     

沉默结缔组织生长因子对大鼠肝纤维化及细胞外基质积聚的影响

目的 研究结缔组织生长因子(CTGF)小干扰RNA(siRNA)在CCl4诱导的大鼠肝纤维化模型中的抗肝纤维化作用及其对细胞外基质积聚的影响.方法 雄性SD大鼠30只,随机分成5组.模型组:皮下注射CCl4及经门静脉注射等渗盐水,3 d 1次,连续6周;预防组:皮下注射CCl4及经门静脉注射CTGF siRNA,连续6周;治疗组:皮下注射CCl4 2周,随后给予CTGF siRNA及CCl4 4周;对照siRNA干预组:皮下注射CCl4及经门静脉注射对照siRNA,连续6周;空白对照组:经门静脉注射等渗盐水6周.用HE和Sirius red染色评估大鼠肝组织学变化,RTPCR或(和)Western blot检测肝组织CTGF、Ⅰ与Ⅲ型胶原及层黏连蛋白的表达,放射免疫法检测外周血Ⅲ型前胶原及透明质酸含量.结果 模型组及对照siRNA组大鼠肝组织CTGF、Ⅰ与Ⅲ型胶原及层黏连蛋白基因表达显著上调;与模型组相比,预防组及治疗组由CCl4诱导的CTGF mRNA和蛋白表达及Ⅰ与Ⅲ型胶原、层黏连蛋白mRNA表达分别下调76%±8%、95%±2%、74%±8%、78%±8%、31%±7%和80%±3%、93%±3%、57%±6%、59%±10%、43%±9%(F值分别为68.630,21.234,24.219,16.315和9.716,P值均＜0.01),肝纤维化程度明显减轻,大鼠外周血Ⅲ型前胶原和透明质酸含量也显著降低.结论 经门静脉注射CTGF siRNA能显著抑制实验大鼠肝CTGF基因表达,由此通过阻止细胞外基质积聚而缓解肝纤维化.     

软肝缩脾丸对肝纤维化大鼠TIMP-1、2及工、Ⅲ型胶原mRNA及蛋白表达的影响

目的观察软肝缩脾丸对纤维化大鼠肝脏基质金属蛋白酶组织抑制因子-1、2(TIMP-1、TIMP-2)及Ⅰ、Ⅲ型胶原mRNA及蛋白表达的影响,从胶原降解的角度探索中药抗肝纤维化的可能机理.方法制备大鼠肝纤维化模型,并给予软肝缩脾丸治疗;用原位杂交和免疫组化的方法分别测定TIMP-1、TIMP-2及Ⅰ、Ⅲ型胶原的mRNA和蛋白表达.结果CC14模型组TIMP1、TIMP-2,Ⅰ、Ⅲ型胶原mRNA及蛋白水平明显高于治疗组.正常组大鼠肝组织无一例阳性.结论TIMP-1、TIMP-2与肝纤维化形成密切相关,软肝缩脾丸可以抑制纤维化肝脏TIMP-1、TIMP-2的表达,从而增强间质胶原酶的活性,促进Ⅰ、Ⅲ型胶原的降解,产生抗肝纤维化作用.     

β胡萝卜素对酒精性肝纤维化的防治效果

目的:研究β胡萝卜素防治酒精性肝纤维化患者的效果.方法:203例受试者,其中酒精性肝纤维化67例,非酒精性肝纤维化74例,慢性肝炎肝纤维化患者62例.另选60例健康体检者.采用肝纤维化血清透明质酸(HA)、层黏蛋白(LN)、Ⅳ型前胶原(Ⅳ-C)、Ⅲ型前胶原肽(PCⅢ)、血清结缔组织生长因子(CTGF)、血小板衍生生长因子-BB(PDGF-BB)、金属蛋白酶抑制剂-1(TIMP-1)、转化生长因子-β1(TGF-β1)、彩超进行组内组间比较,分析β胡萝卜素防治酒精性肝纤维化患者的效果.结果:HA、LN、Ⅳ-C、PCIII在肝纤维化S0-S1、S2-S4期患者治疗前较健康体检者均有显著性差异(均P<0.01).治疗后,除Ⅳ-C(μg/L)S2-S4期患者较健康体检者有统计学差异外(95.57±15.47,100.16±13.70,96.89±16.41vs84.05±24.16,均P<0.05),其他均无差异.CTGF、PDGF-BB、TIMP-1、TGF-β1在肝纤维化S0-S1、S2-S4期患者治疗较健康体检者均有统计学差异(均P<0.01).治疗后,除CTGF(μg/L)、PDGF-BB(μg/L)S2-S...     

金钗石斛多糖对肝纤维化大鼠TGF-β1、α-SMA、Ⅰ型胶原、Ⅲ型胶原表达的影响

目的探讨金钗石斛多糖(DNP)对肝纤维化(HF)大鼠肝组织转化生长因子(TGF)-β1、α-平滑肌肌动蛋白(α-SMA)、Ⅰ、Ⅲ型胶原表达的影响。方法SD大鼠随机分为正常组,模型组,秋水仙碱组(0.2 mg/kg),扶正化瘀组(0.415 g/kg),DNP低、中、高剂量组(5、10、20 g/kg),采用50%四氯化碳腹腔注射和30%乙醇灌胃诱导大鼠HF模型,造模8 w后,给予相应药物(10 ml/kg)进行灌胃,每日1次,给药4 w,正常组、模型组灌胃生理盐水。苏木素-伊红(HE)染色和Masson染色观察HF程度;免疫组化法检测肝组织TGF-β1、α-SMA、Ⅰ、Ⅲ型胶原蛋白表达;荧光定量聚合酶链反应(PCR)检测肝组织Ⅰ、Ⅲ型胶原mRNA表达。结果与正常组比较,模型组明显纤维化(P<0.01),TGF-β1、α-SMA、Ⅰ、Ⅲ型胶原蛋白表达明显升高(P<0.01),Ⅰ、Ⅲ型胶原mRNA表达亦明显升高(P<0.01);与模型组比较,DNP各组肝纤维化程度均有所减轻(P<0.01),DNP降低TGF-β1、α-SMA、Ⅰ、Ⅲ型胶原蛋白表达(P<0.01),DNP降低Ⅰ、Ⅲ型胶原mRNA表达(P<0.01)。结论DNP有抗纤维化作用,其机制可能与下调TGF-β1、α-SMA、Ⅰ、Ⅲ胶原蛋白表达,降低Ⅰ、Ⅲ胶原mRNA表达有关。     

奥曲肽抗肝纤维化的实验研究

目的 观察奥曲肽(Oct)对大鼠实验性肝纤维化的治疗效果,并探讨其作用机制。方法 用四氯化碳诱导大鼠肝纤维化模型,将实验动物随机分为正常对照组、治疗前模型组、治疗后模型组和Oct治疗组。Oct治疗组给予Oct(50ng/100g)皮下注射,每日2次,连续用药30d,分别用放射免疫法检测血清层黏连蛋白(LN)、Ⅲ型前胶原(PC Ⅲ)及透明质酸(HA)。VG染色法组织切片观察组织病理变化,免疫组织化学法检测肝组织平滑肌肌动蛋白(α-SMA)和转化生长因子β_1(TGFβ_1)表达及逆转录聚合酶链反应法检测Ⅰ型和Ⅲ型前胶原mRNA表达。结果 治疗前和治疗后模型组大鼠血清HA(ng/L)为121.8±9.5和110.3±13.4,正常对照组为33.1±3.7、LN(μg/L)为85.7±12.1和78.2±7.9,正常对照组为37.1±6.3、PC Ⅲ(ng/L)为35.9±3.5和33.7±2.6,正常对照组为15.6±2.8。Oct组大鼠血清HA为55.8±7.2、LN为43.1±3.4、PC Ⅲ为27.8±3.4,与模型组大鼠比较,差异有显著性,t=2.76～11.07,P<0.05。Oct能显著降低纤维化大鼠肝组织纤维化积分,下调α—SMA和TGFβ_1蛋白质及I型和III前胶原mRNA表达水平。结论 Oct抑制肝星状细胞激活和转化、下调TGFβ_1蛋白质及I型和III型前胶mRNA表达而发挥抗肝纤维化作用。     

软肝缩脾丸对肝纤维化大鼠TIMP-1、2及Ⅰ、Ⅲ型胶原mRNA及蛋白表达的影响

目的　观察软肝缩脾丸对纤维化大鼠肝脏基质金属蛋白酶组织抑制因子 -1、2 (TIMP -1、TIMP -2 )及Ⅰ、Ⅲ型胶原mRNA及蛋白表达的影响 ,从胶原降解的角度探索中药抗肝纤维化的可能机理。方法　制备大鼠肝纤维化模型 ,并给予软肝缩脾丸治疗 ;用原位杂交和免疫组化的方法分别测定TIMP -1、TIMP -2及Ⅰ、Ⅲ型胶原的mRNA和蛋白表达。结果　CCl4模型组TIMP -1、TIMP -2 ,Ⅰ、Ⅲ型胶原mRNA及蛋白水平明显高于治疗组。正常组大鼠肝组织无一例阳性。结论　TIMP -1、TIMP -2与肝纤维化形成密切相关 ,软肝缩脾丸可以抑制纤维化肝脏TIMP -1、TIMP -2的表达 ,从而增强间质胶原酶的活性 ,促进Ⅰ、Ⅲ型胶原的降解 ,产生抗肝纤维化作用。     

螺内酯预防大鼠实验性肝纤维化的动态研究

目的研究螺内酯对大鼠肝内纤维组织形成的动态变化.方法SD大鼠90只,随机分成正常对照组(8只)正常饮食,皮下注射花生油;肝纤维化模型组(42只)复合因素制成肝纤维化模型和螺内酯预防组(40只)造模方法同模型组,螺内酯每日100mg/kg灌胃.分别于第2、4、6、8周随机处死8只大鼠,取肝组织测定胶原面积和胶原定量,眼球采血检测透明质酸、Ⅲ型前胶原、Ⅳ型胶原和层粘连蛋白含量.结果螺内酯预防组较模型组同期肝组织胶原含量明显减少(P＜0 05),血清透明质酸、Ⅲ型前胶原、Ⅳ型胶原和层粘连蛋白水平均明显降低(P＜0.05).结论螺内酯有明显抑制大鼠肝纤维化形成的作用.     

Effects of augmentation of liver regeneration recombinant plasmid on rat hepatic fibrosis

AIM: To investigate the effects of eukaryotic expression of plasmid on augmentation of liver regeneration (ALR) in rat hepatic fibrosis and to explore their mechanisms. METHODS: Ten rats were randomly selected from 50 Wistar rats as normal control group. The rest were administered intraperitoneally with porcine serum twice weekly. After 8 wk, they were randomly divided into: model control group, colchicine group (Col), first ALR group (ALR1), second ALR group (ALR2). Then colchicine ALR recombinant plasmid were used to treat them respectively. At the end of the 4th wk, rats were killed. Serum indicators were detected and histopathological changes were graded. Expression of type Ⅰ, Ⅲ, collagen and TIMP-1 were detected by immunohisto-chemistry and expression of TIMP-1 mRNA was detected by semi-quantified RT-PCR. RESULTS: The histologic examination showed that the degree of the rat hepatic fibrosis in two ALR groups was lower than those in model control group. Compared with model group, ALR significantly reduced the serum levels of ALT, AST, HA, LN, PCIII and IV (P<0.05). Immunohistochemical staining showed that expression of type Ⅰ, Ⅲ, collagen and TIMP-1 in two ALR groups was ameliorated dramatically compared with model group (I collagen: 6.94±1.42,5.80±1.66 and 10.83±3.58 in ALR1, ALR2 and model groups, respectively; Ⅲ collagen: 7.18±1.95, 4.50±1.67 and 10.25±2.61, respectively; TIMP-1: 0.39±0.05,0.20±0.06 and 0.53±0.12, respectively,P<0.05 or P<0.01). The expression level of TIMP-1 mRNA in the liver tissues was markedly decreased in two ALR groups compared with model group (TIMP-1 mRNA/β-actin: 0.89±0.08, 0.65±0.11 and 1.36±0.11 in ALR1, ALR2 and model groups respectively, P<0.01). CONCLUSION: ALR recombinant plasmid has beneficial effects on rat hepatic fibrosis by enhancing regeneration of injured liver cells and inhibiting TIMP-1 expressions.     

大鼠肝纤维化病理过程中Smads锚着蛋白表达变化

目的观察肝纤维化病理过程中肝脏Smads锚着蛋白(SARA)的表达变化及其与肝纤维化的关系。方法大鼠每kg体重10μl二甲基亚硝胺腹腔注射,1次/d,每周连续3 d,共4周,复制大鼠肝纤维化模型。模型大鼠分别设首次造模后1、3 d、1,2、3、4周末,与造模停止后1、2、4周,共9个时间段为观察组。每组5～8只,另设正常大鼠10只为对照组。天狼猩红染色观察肝组织胶原沉积,盐酸水解法测定肝组织羟脯氨酸(HYP)含量,免疫组织化学染色观察肝组织SARA蛋白表达,Western blot法分析肝组织转化生长因子(TGF)β1、α-平滑肌肌动蛋白(α-SMA)和SARA蛋白的表达,并进行以上指标的相关性分析。结果随二甲基亚硝胺染毒持续,模型大鼠肝脏胶原增生(Hyp含量)与沉积增加,4周末时达到高峰,可见宽大纤维间隔与假小叶；而后随染毒停止,肝脏胶原沉积与纤维间隔有所减轻。模型组4、5、6、8周肝组织Hyp平均含量(μg/g)分别为193．0±39．2、188．5±39．9．174．4±21．2、163．6±31．5,对照组分别为125．6±19．5,t值在3．43～4．9,P值均＜0．01。免疫组织化学染色发现,SARA主要表达于正常与纤维化肝脏的肝窦周围间质细胞,随肝纤维化发展SARA阳性染色细胞数量减少,随染毒停止与肝纤维化恢复,SARA渐恢复至正常组水平。Western blot发现,随肝纤维化形成,模型大鼠肝组织TGFβ1、α-SMA蛋白表达逐渐增加,而SARA蛋白表达逐渐减少；肝纤维化恢复过程中,SARA渐恢复接近正常水平,TGFβ1与α-SMA蛋白表达有所下降。在肝纤维化形成与恢复过程中,SARA蛋白与Hyp含量、TGFβ1与α-SMA表达均呈明显负相关。结论SARA蛋白主要表达于肝脏间质细胞；随大鼠肝纤维化发展,SARA表达减少,SARA蛋白与肝纤维化形成呈负相关关系。     

胡黄连苦苷Ⅱ抗大鼠肝纤维化的作用研究

背景：胡黄连苦苷Ⅱ可治疗急性肝损伤,但对肝纤维化的作用尚不明。目的：探讨胡黄连苦苷Ⅱ对CCl4致大鼠肝纤维化的治疗作用及其机制。方法：采用CCl4腹腔注射诱导大鼠肝纤维化模型,56只大鼠分为正常对照组、模型组、胡黄连苦苷Ⅱ治疗组和胡黄连苦苷Ⅱ对照组。造模第8周,处死大鼠：以HE染色和Masson染色观察肝组织改变和肝纤维化程度,以电子显微镜观察超微结构变化,检测血清丙氨酸氨基转移酶（ALT）、天冬氨酸氨基转移酶（AST）、白蛋白（ALB）以及组织丙二醛（MDA）水平,以逆转录聚合酶链反应（RT—PCR）和免疫组化法分别检测肝组织转化生长因子（TGF）-β1、Ⅰ型胶原mRNA和蛋白表达。结果：与正常对照组相比,模型组肝组织炎症和纤维化程度、血清ALT、AST以及肝组织MDA水平、TGF—β1和Ⅰ型胶原mRNA和蛋白表达显著增高,血清ALB水平显著降低,超微结构发生显著改变。经胡黄连苦苷Ⅱ治疗后,上述指标均显著改善,但与正常对照组相比差异仍有统计学意义。胡黄连苦苷Ⅱ对照组上述各项指标与正常对照组无明显差异：结论：胡黄连苦苷Ⅱ可通过改善肝功能、抑制脂质过氧化反应、下调TGF-β1和Ⅰ型胶原mRNA和蛋白表达而抑制肝纤维化的形成。     

Effect of Oxymatrine on the TGFbeta-Smad signaling pathway in rats with CCl4-induced hepatic fibrosis

AIM： To explore the anti-fibrotic effect of Oxymatrine on CCl4-induced liver fibrosis in rats and its modulation on the TGFbeta-Smad signaling pathway. METHODS： One hundred healthy male SD rats were randomly divided into three groups： normal group （n = 20）, treatment group of Oxymatrine （n = 40） and CCh-induced fibrosis group （n = 40）. Experimental hepatic fibrosis was induced by subcutaneous injection of carbon tetrachloride （CCh soluted in liquid paraffin with the concentration of 300 g/L, the dosage of injection was 3 mL/kg, twice per week for 8 wk）. The treated rats received Oxymatrine via celiac injection at a dosage of 10 mg/kg twice a week at the same time. The deposition of collagen was observed with H＆E and Masson staining. The concentration of serum TGF-β1 was assayed with ELISA. The gene expression of Smads and CBP （CREB binding protein） was detected with in situ hybridization （ISH） and immunohistochemistry （IH）, respectively. All the experimental figures were scanned and analyzed with special figure-analysis software. RESULTS： A significant reduction of collagen deposition and rearrangement of the parenchyma was noted in the liver tissue of Oxymatrine-treated rats. The semi- quantitative histological scores （2.43 ± 0.47 μm^2 vs 3.76 ±0.68, P 〈 0.05） and average area of collagen/in those rats were significantly decreased when compared with hepatic cirrhosis model rats （94.41 ± 37.26 μm^2 vs 290.86 ± 89.37 μm^2, P 〈 0.05）. The gene expression of Smad 3 mRNA was considerably decreased in the treated animals. The A value of Smad 3 mRNA was lower in the treated rats than the model rats （0.034 ± 0.090 vs 0.167 ± 0.092, P 〈 0.05）. Contrarily, the A value of Smad 7 mRNA was increased considerably in the treated animals （0.175 ± 0.065 vs 0.074 vs 0.012, P 〈 0.05）. There was an obvious decrease in the expression of CBP mRNA in treated rats as illuminated by a reduction of its A value when compared with model rats （0.065±0.049 vs 0.235 ?     

原肌球蛋白1在大鼠肝纤维化模型及肝星状细胞中的动态表达及其意义

目的 观察原肌球蛋白1 (TPMl)在大鼠肝纤维化模型及肝星状细胞(HSC)中的动态表达.方法 将SD大鼠随机分为正常对照组(6只)和模型组(24只).二甲基亚硝胺腹腔注射建立大鼠肝纤维化模型,于第2、4、6、8周(每组各6只)门静脉采血及取肝组织标本; HSC-T6细胞设对照组及刺激组,刺激组以5 ng/ml转化生长因子β 1(TGF β 1)作用48h.苏木素-伊红和Masson染色观察肝组织病理变化,RT-PCR、免疫组织化学和Western blot检测组织与细胞中TPMl,TGF β1及α平滑肌肌动蛋白(α-SMA)的mRNA和蛋白的表达,以及TPMl在肝组织中的定位.两样本均数比较采用独立样本t检验;相关性采用Pearson直线相关分析.结果 成功建立肝纤维化模型,TPMl在正常肝组织中低表达于汇管区血管内皮上,在模型组TPMl强表达于增生的肝纤维间隔,TPMl及α-SMA的mRNA及蛋白的表达在肝纤维化过程中均逐渐升高,6周时高于其他各组,8周时下降,与对照组相比,差异均有统计学意义(P＜ 0.05);TGF β 1先升高,4周时高于其他各组,6周时下降(P＜0.05);相关性分析表明TPMl与o-SMA和TGF β 1的表达均呈正相关(rs=0.688和rs=0.692,P＜0.01); HSC-T6细胞中,TGF β 1刺激组TPM1及α- SMA的mRNA表达均升高,差异有统计学意义(P＜0.05).结论 TPMl参与了肝纤维化的发生和发展过程,有望成为肝纤维化诊断与治疗的新靶点.     

肥大细胞及蛋白酶激活受体-2在大鼠实验性肝纤维化中的变化

目的观察肝纤维化大鼠的肥大细胞(MC)数量变化和蛋白酶激活受体-2(PAR-2)在肝脏中表达及其与肝纤维化的关系。方法建立大鼠肝纤维化模型,以甲苯胺蓝染色显示MC,运用碱水解法测定肝脏羟脯氨酸含量,采用逆转录聚合酶链反应(RT-PCR)方法检测正常对照组及造模2、4、8、12周组大鼠肝组织中PAR-2 mRNA的表达,免疫组织化学方法检测PAR-2蛋白的表达及定位。结果正常对照组大鼠肝组织中MC数量极少,仅(2．5±1．0)个,主要沿肝脏汇管区分布；模型组MC数量：2周为(9．1±0．5)个,4周为(15．7±3．0)个,8周为(32．0±3．3)个。造模组2周与正常组比较,P=0．038,造模组组间比较,F=58．553,P＜0．01,差异均有统计学意义。MC在汇管区、中央静脉周围密集分布。随着造模时间的延长,肝脏羟脯氨酸的含量逐渐升高。PAR-2 mRNA检测结果,PAR- 2/β-肌动蛋白(β-actin)：正常对照组几乎不表达；造模2周肝组织可有少量PAR-2 mRNA表达,为0．15±0．01,4周为0．35±0．02,8周为0．80±0．02。PAR-2蛋白检测结果,阳性信号灰度：正常对照组为156．0±0．5；造模2周为162．5±1．3,4周为174．8±1．3,8周为185．7±2．1,12周为207．7±4．4,模型组与对照组比较和模型组组间比较,F=429．389,P＜<0．01,差异均有统计学意义。结论PAR-2 mRNA和蛋白的表达水平与MC数量、羟脯氨酸含量的增加一致,可能在肝纤维化的发生发展过程中起重要作用。     

Filtrate of fermented mycelia from Antrodia camphorata reduces liver fibrosis induced by carbon tetrachloride in rats

AIM: To investigate the effects of filtrate of fermented mycelia from Antrodia camphorata (FMAC) on liver fibro-sis induced by carbon tetrachloride (CCI4) in rats. METHODS: Forty Wistar rats were divided randomly into control group and model group. All model rats were given 200 mL/L CCI4 (2 mL/Kg, po) twice a week for 8 wk. Four weeks after CCI4 treatment, thirty model rats were further divided randomly into 3 subgroups: CCI4 and two FMAC subgroups. Rats in CCI4 and 2 FMAC subgroups were treated with FMAC 0, 0.5 and 1.0 g/kg, daily via gastrogavage beginning at the fifth week and the end of the eighth week. Spleen weight, blood synthetic markers (albumin and prothrombin time) and hepatic malondial-dehyde (MDA) and hydroxyproline (HP) concentrations were determined. Expression of collagen I, tissue inhibitor of metalloproteinases (TIMP)-1 and transforming growth factorβ1 (TGF-β1) mRNA were detected by RT-PCR. Histochemical staining of Masson's trichrome was performed. RESULTS: CCI4 caused liver fibrosis, featuring increased prothrombin time, hepatic MDA and HP contents, and spleen weight and decreased plasma albumin level. Compared with CCI4 subgroup, FMAC subgroup (1 g/kg) significantly decreased the prothrombin time (36.7±7.2 and 25.1±10.2 in CCI4 and FMAC groups, respectively, P<0.05) and increased plasma albumin concentration (22.7±1.0 and 30.7±2.5 in CCI4 and FMAC groups, respectively, P< 0.05). Spleen weight was significantly lower in rats treated with CCI4 and FMAC (1 g/kg) compared to CCI4 treated rats only (2.7±0.1 and 2.4±0.2 in CCI4 and FMAC groups, respectively, P<0.05). The amounts of hepatic MDA and HP in CCI4±FAMC (1 g/kg) subgroup were also lower than those in CCI4 subgroup (MDA: 3.9±0.1 and 2.4±0.6 in CCI4 and CCI4 FMAC groups, respectively, P< 0.01; HP: 1730.7±258.0 and 1311.5±238.8 in CCI4 and CCI4 FMAC groups, respectively, P<0.01). Histologic examinations showed that CCI4 FMAC subgroups had thinner or less fibrotic septa than CCI4 group. RT-PCR analysis indicated that FMAC (1 g/kg) reduced mRNA levels of collagen I, TIMP-1 and TGF-β1 (collagenⅠ: 5.63±2.08 and 1.78±0.48 in CCI4 and CCI4 FMAC groups, respectively, P<0.01; TIMP-1: 1.70±0.82 and 0.34±0.02 in CCI4 and CCI4 FMAC groups, respectively, P<0.01; TGF-β1:38.03±11.9 and 4.26±2.17 in CCI4 and CCI4 FMAC groups, respectively, P<0.01) in the CCI4-treated liver. CONCLUSION: It demonstrates that FMAC can retard the progression of liver fibrosis induced by CCI4 in rats.     

Blockage of transforming growth factor β receptors prevents progression of pig serum-induced rat liver fibrosis

AIM: To test the hypothesis that introduction of antisense TβR Ⅰ and TβR Ⅱ eukaryotic expressing plasmids into a rat model of immunologically induced liver fibrosis might block the action of TGF-β1 and halt the progression of liver fibrosis. METHODS: RT-Nest-PCR and gene recombination techniques were used to construct rat antisense TβR Ⅰ and TβR Ⅱ recombinant plasmids which could be expressed in eukaryotic cells. The recombinant plasmids and empty vector (pcDNA3) were encapsulated by glycosyl-poly-L-lysine and then transducted into rats of pig serum-induced liver fibrosis model. Expression of exogenously transfected gene was assessed by Northern blot, and hepatic expressions of TβR Ⅰ and TβR Ⅱ were evaluated by RT-PCR and Western blot.We also performed ELISA for serum TGF-β1, hydroxyproline of hepatic tissues, immunohistochemistry for collagen types Ⅰ and Ⅲ, and VG staining for pathological study of the liver tissues. RESULTS: The exogenous antisense TβR Ⅰ and TβR Ⅱ plasmids could be well expressed in vivo, and block mRNA and protein expression of TβR Ⅰ and TβR Ⅱ in the fibrotic liver at the level of mRNA respectively. These exogenous plasmid expressions reduced the level of TGF-β1 (antisense TβR Ⅰ group 23.998+3.045 ng/mL, antisense TβR Ⅱ group 23.156+3.131 ng/mL, disease control group 32.960+3.789 ng/mL; F-=-38.19, 36.73, P&lt;0.01). Compared with disease control group, the contents of hepatic hydroxyproline (antisense TβR Ⅰ group 0.169+0.015 mg/g liver, antisense TβR Ⅱ group 0.167+0.009 mg/g liver, disease control group 0.296+0.026 mg/g liver; F=14.39, 15.48, P&lt;0.01) and the deposition of collagen types Ⅰ and Ⅲ decreased in the two antisense treatment groups(antisense TβR Ⅰ group, collagen type Ⅰ 669.90+50.67, collagen type Ⅲ 657.29+49.48; antisense TβR Ⅱ group, collagen type Ⅰ 650.26+51.51, collagen type Ⅲ 661.58+55.28; disease control group, collagen type I 1209.44+116.60, collagen type Ⅲ 1175.14+121.44; F=15.48 to 74.89, P&lt;0.01). Their expression also improved the pathologic classification of liver fibrosis models (compared with disease control group, X^2=17.14, 17.24, P&lt;0.01). No difference was found in the level of TGF-β1, the contents of hepatic hydroxyproline and collagen types Ⅰ and Ⅲ and pathologic grade between pcDNA3 control group and disease control group or between the two antisense treatment groups (F=0.11 to1.06, X^2=0.13 to 0.16, P&gt;0.05). CONCLUSION: Antisense TβR Ⅰ and TβR Ⅱ recombinant plasmids have certain reverse effects on liver fibrosis and can be used as possible candidates for gene therapy.     

罗格列酮对非酒精性脂肪性肝炎大鼠肝组织Kruppule样因子6信号通路的影响

目的观察罗格列酮对NASH肝纤维化大鼠肝组织kruppule样因子（KLF）6及其下游靶基因TGFβ1信号通路的影响。方法36只雄性Wistar大鼠随机分为对照组、高脂组和罗格列酮组,24周末处死所有大鼠,留取肝组织行HE和Massson染色,检测血清TG、游离脂肪酸、AST、ALT及HA、LN、CⅣ等,RT-PCR检测核转录因子KLF6、TGFβ1以及反映HSC活化的特异性标记α-平滑肌肌动蛋白（α-SMA）mRNA的变化,免疫组织化学检测KLF6、过氧化物酶体增殖物激活受体γ、α-SMA的蛋白表达。结果模型组大鼠24周末出现典型脂肪性肝纤维化,治疗组纤维化程度明显减轻和改善。模型组血清生物化学指标及肝纤维化指标均有不同程度增高,罗格列酮干预16周后上述各指标均见明显改善,两组间差异有统计学意义（P〈0.01）。RT-PCR显示模型组KLF6 mRNA（0.96±0.08）、TGFβ1 mRNA（0.91±0.07）和α-SMA mRNA （1.08±0.19）的相对表达量均明显上升,与对照组比较差异有统计学意义（P〈0.01）;治疗组则显示增高的上述基因呈不同程度的下降,差异有统计学意义（P〈0.01）。免疫组织化学显示罗格列酮组KLF6、α-SMA蛋白的表达较模型组减少,而PPARγ的表达较模型组增加,差异均有统计学意义（P〈0.05）。结论罗格列酮可以激活PPARγ,降低NASH肝纤维化大鼠肝组织核转录因子KLF6及其下游靶基因TGFβ1的表达,抑制HSC的活化,阻止肝纤维化形成,这可能是其发挥抗肝纤维化的作用之一。