去甲肾上腺素对大鼠肝星状细胞作用的实验研究

目的 探讨交感神经系统在肝纤维化发生和发展中的作用. 方法采用免疫荧光和RT-PCR检测体外培养的肝星状细胞(HSC)中α1、β2-肾上腺素能受体的表达;用四甲基偶氮唑盐法检测不同浓度的去甲肾上腺素(NE)对HSC增殖活性的影响.同时用RT-PCR检测受NE作用后HSC的活化指标胶原蛋白-1、转化生长因子β(TGF β)及α-平滑肌动蛋白(α-SMA)的表达.用高效液相色谱-电化学法测定活化的HSC中交感神经递质NE的水平. 结果α1和β2-肾上腺素能受体表达于HSC的胞膜和胞质内;NE可呈剂量依赖性地促进HSC增殖,在浓度为100μmol/L时达到最大效应,F=140.464,P<0.05,差异有统计学意义.以NE 100 μmol/L作用细胞24h后,可显著促进反应HSC活化的指标上升,胶原蛋白-1表达为0.3022±0.0610,TGF β表达为2.2080±0.2151,α-SMA mRNA表达为0.5469±0.0108,与对照组胶原蛋白-1(0.1040±0.0556)、TGF β(1.1190±0.0070)、α-SMA mRNA表达(0.0759±0.0449)比较,t值分别为-4.160、-8.763和-17.651,P值均<0.05,差异均有统计学意义.HSC可以合成并释放NE,且受血小板衍生生长因子(10ng/ml)刺激后HSC中NE含量为(14.24±0.21)ng/ml,对照组为(11.34±0.15)ng/ml,两组比较,t=-32.907,P<0.05,差异有统计意义.结论 抑制交感神经系统使HSC活性降低对临床上治疗肝纤维化有一定的指导意义.     

甘草次酸靶向肝星状细胞治疗肝纤维化的体内研究

目的观察以6-磷酸甘露糖修饰的白蛋白(M6P26-HSA)作为特异性载体,将甘草次酸(GA) 靶向释放到肝星状细胞治疗肝纤维化的效果。方法用125I记由M6P26-HSA和GA在体外合成新的偶合物GA-HSA-M6P26,观察其在体内的器官分布情况,用双重免疫组织化学的方法观察星状细胞对GA- HSA-M6P26的选择性摄取;选用Sirius红染色观察GA-HSA-M6P26对肝纤维化时胶原沉积的影响,用定量聚合酶链反应检测GA-HSA-M6P26对Ⅰ型前胶原mRNA表达的影响。结果静脉注射后10min,GA-HSA- M6P26选择性地分布于肝脏,摄取高峰可达(5 5.093±5.404)%。双重免疫组织化学染色证实GA-HSA- M6P26主要被星状细胞选择性摄取,GA-HSA-M6P26治疗后肝脏胶原沉积明显减少,Ⅰ型前胶原和α-平滑肌肌动蛋白mRNA表达明显降低。结论GA-HSA-M6P26可以选择性地分布于肝脏星状细胞,有显著的抗肝纤维化作用。     

肝星状细胞激活与信号转导

肝纤维化是多种慢性肝病向肝硬化发展的必经阶段,是所有慢性肝病的共同病理基础.目前认为肝星状细胞的激活是肝纤维化形成的关键,各种致病因素作用下引起肝损伤,释放多种细胞因子,如转化生长因子β、血管紧张素、瘦素,通过各种信号转导使肝星状细胞激活.本文就肝星状细胞激活过程中一些重要的膜受体、核受体信号转导途径及其研究进展作一综述.     

木犀草素抑制肝星状细胞增殖及其胶原合成

目的 研究木犀草素对体外培养的肝星状细胞(hepatic stellate cells,HSC)增殖及其胶原表达、合成的影响。方法 从Wistar大鼠肝脏分离培养HSC,并用~3H-TdR和~3H-pro同位素掺入实验,基因探针原位杂交等技术研究了木犀草素对HSC增殖、胶原基因表达合成的影响。结果 当木犀草素的浓度分别达到10 μmol/L和20 μmol/L 时抑制HSC增殖(t=2.542,P＜0.05)和胶原合成(t=3.650,P＜0.01),其作用具有剂量依赖关系;25 μmol/L木犀草素使Ⅰ、Ⅲ型前胶原mRNA的表达降低,其中Ⅰ型前胶原基因表达降低具有统计学差异(x~2=6.850,P＜0.01)。结论 木犀草素在体外抑制HSC增殖和胶原表达合成,在体内可能会具有预防或冶疗肝纤维化的作用。     

锌α2糖蛋白抑制肝星状细胞活化和增殖的体外研究

目的探讨锌α2糖蛋白(AZGP1)在肝星状细胞活化和肝纤维化发生和发展中的作用机制。方法采用转化生长因子-β1刺激诱导人肝星状细胞株LX2活化和构建四氯化碳小鼠肝纤维化模型,观察细胞和肝组织中AZGP1的表达情况。应用质粒转染法过表达和抑制表达AZGP1后,分别检测LX2细胞的活化、增殖和凋亡功能及相关因子的改变。多组间比较采用单因素方差分析。结果免疫荧光染色结果显示在活化的LX2细胞中,AZGP1蛋白减少而α-平滑肌肌动蛋白增多,二者呈负相关。AZGP1基因和蛋白在活化的LX2细胞和四氯化碳肝纤维化小鼠的肝组织内显著低表达。过表达AZGP1后,LX2细胞中Ⅰ型胶原、基质金属蛋白酶-2和α-平滑肌肌动蛋白基因和蛋白明显下调;细胞荧光显示过表达AZGP1的细胞活化和α-平滑肌肌动蛋白减少。此外,过表达AZGP1后,LX2细胞的增殖活性和G1/S-特异性周期蛋白D1蛋白显著降低;细胞周期实验显示过表达AZGP1的细胞停滞在G0/G1期比例显著增多、而S期比例显著减少。AZGP1对LX2细胞凋亡无明显影响。结论AZGP1可通过抑制肝星状细胞活化和增殖而逆转肝纤维化;过表达AZGP1有望成为肝纤维化治疗的新靶点。     

肝星状细胞的活化与肝纤维化

肝纤维化是机体对损伤的一种修复作用，即使可以应用基因或其他疗法彻底消除纤维化，但机体对抑制或消除纤维化后将产生何种反应及后果尚难预测。肝星状细胞（hepatic stellate cells，HSC）是引起肝纤维化的主要细胞，对HSC与其活化型一肌成纤维细胞（myofibroblast，MF）在肝损伤中作用的研究已颇为深入，而HSC激活在肝纤维化发生、发展中的作用甚为重要。     

大麻素受体2介导的N-花生四烯酸氨基乙醇对肝星状细胞增殖和活化的影响

目的 观察内源性大麻素N-花生四烯酸氨基乙醇(AEA)及大麻素受体(CBR)2对肝星状细胞(HSC)增殖活化的影响,以探讨内源性大麻素及其受体系统在肝纤维化发展中的作用.方法 采用免疫荧光观察血小板衍生生长因子(PDGF)刺激前后HSC中CBR1和CBR2的表达.Western blot、PCR法观察不同浓度AEA及CBR2拮抗剂AM630对PDGF刺激下HSC增殖及活化的影响,同时用四甲基偶氮唑盐、流式细胞仪分析AEA对HSC活力及凋亡的影响.结果 HSC中CBR2的表达较CBR1高(F=116.797,P<0.01),且PDGF刺激后CBR2的表达明显增强(F=7.878,P<0.05).AEA可剂量依赖地抑制HSC的增殖,在浓度为10,20、50μmol/L时抑制率分别为7.12%±0.34%、12.52%±0.78%、80.13%±1.57%,差异有统计学意义(F=533.41,P<0.01);但对HSC凋亡的影响不明显.同时AEA可抑制HSC的活化指标α-平滑肌肌动蛋白、转化生长因子β1、Ⅰ型胶原、Ⅲ型胶原及基质金属蛋白酶抑制因子等的表达,但这种抑制作用在给予CBR2拮抗剂AM630后明显减弱,差异有统计学意义(P<0.05).结论 CBR2在AEA引起的HSC增殖及活化抑制中起关键作用,AEA和CBR2可望成为肝纤维治疗的新靶点.     

Tetrandrine inhibits activation of rat hepatic stellate cells in vitro via transforming growth factor-β signaling

AIM: To investigate the effect of various concentrations of tetrandrine on activation of quiescent rat hepatic stellate cells (HSCs) and transforming growth factor-β (TGF-β) signaling in vitro.METHODS: HSCs were isolated from rats by in situperfusion of liver and 18% Nycodenz gradient centrifugation, and primarily cultured on uncoated plastic plates for 24 hwith DMEM containing 20% fetal bovine serum (FBS/DMEM) before the culture medium was substituted with 2% FBS/DMEM for another 24 h. Then, the HSCs were cultured in 2% FBS/DMEM with tetrandrine (0.25, 0.5, 1,2 mg/L, respectively). Cell morphological features were observed under an inverted microscope, smooth muscleα-actin (α-SMA) was detected by immunocytochemistry and image analysis system, laminin (LN) and type Ⅲprocollagen (PCⅢ) in supernatants were determined byradioimmunoassay. TGF-β1 mRNA, Smad 7 mRNA and Smad 7 protein were analyzed with RT-PCR and Western blotting, respectively.RESULTS: Tetrandrine at the concentrations of 0.25-2 mg/L prevented morphological transformation of HSC from the quiescent state to the activated one, while α-SMA, LN and PCⅢ expressions were inhibited. As estimated by gray values, the expression of α-SMA in tetrandrine groups (0.25, 0.5, 1, 2 mg/L) was reduced from 21.3% to 42.2%(control: 0.67, tetrandrine groups: 0.82, 0.85, 0.96, or 0.96, respectively, which were statistically different from the control, P＜0.01), and the difference was more significant in tetrandrine at 1 and 2 mg/L. The content of LN in supernatants was significantly decreased in tetrandrine groups to 58.5%, 69.1%, 65.8% or 60.0% that of the control respectively, and that of PCⅢ to 84.6%, 81.5%,75.7% or 80.7% respectively (P＜0.05 vs control), with no significant difference among tetrandrine groups. RTPCR showed that TGF-β1 mRNA expression was reduced by tetrandrine treatments from 56.56% to 87.90% in comparison with the control, while Smad 7 mRNA was increased 1.4-4.8 times. The TGF-β1 mRNA and Smad 7 mRNA expression was in a significant negative correlation (r= -0.755, P＜0.01), and both were significantly correlated with α-SMA protein expression (r = -0.938, P＜0.01;r = 0.938, P＜0.01, respectively). The up-regulation of Smad 7 protein by tetrandrine (1 mg/L)was confirmed by Western blotting as well.CONCLUSION: Tetrandrine has a direct inhibiting effect on the activation of rat HSCs in culture. It up-regulates the expression of Smad 7 which in turn blocks TGF-β1 expression and signaling.     

苦参碱对大鼠肝星状细胞增殖和凋亡的影响

目的研究苦参碱对体外培养肝星状细胞(HSC)增殖与凋亡的影响,探讨苦参碱抗肝纤维化作用机制。方法用0.125、0.25、0.5mgml的苦参碱分别处理HSC细胞系rHSC99和肝细胞株HL770224h后,MTT比色法检测细胞增殖,AnnexinVFITCPI双染色流式细胞分析法检测早期细胞凋亡,TUNEL法原位检测DNA断裂,透射电镜观察形态改变。结果①苦参碱对HSC增殖有明显的抑制作用,且作用呈剂量依赖性;苦参碱对肝细胞增殖有促进作用,但促增殖作用不随浓度增加而增强。②AnnexinVFITCPI双染色流式细胞分析:对照组、苦参碱0.125mgml组、0.25mgml组、0.5mgml组凋亡率分别为0.99%±0.45%、5.00%±0.98%、13.6%±2.19%、17.2%±2.17%,差异有显著性(F=63.14,P<0.05)。苦参碱处理组细胞TUNEL检测发现DNA断裂,透射电镜下见核仁消失,染色质浓缩并凝聚成团块状,沿核膜排列。结论苦参碱可抑制HSC增殖、诱导HSC凋亡,可能是其抗肝纤维化机制之一。     

Tetrandrine inhibits activation of rat hepatic stellate cells in vitro via transforming growth factor-β signaling

AIM: To investigate the effect of various concentrations of tetrandrine on activation of quiescent rat hepatic stellate cells (HSCs) and transforming growth factor-β (TGF-β) signaling in vitro. METHODS: HSCs were isolated from rats by in situ perfusion of liver and 18% Nycodenz gradient centrifugugation, and primarily cultured on uncoated plastic plates for 24 h with DMEM containing 20% fetal bovine serum (FBS/DMEM) before the culture medium was substituted with 2% FBS/DMEM for another 24 h. Then, the HSCs were cultured in 2% FBS/DMEM with tetrandrine (0.25, 0.5, 1,2 mg/L, respectively). Cell morphological features were observed under an inverted microscope, smooth muscle-α-actin (α-SMA) was detected by immunocytochemistry and image analysis system, laminin (LN) and type Ⅲ procollagen (PCⅢ) in supernatants were determined by radioimmunoassay. TGF-β1 mRNA, Smad 7 mRNA and Smad 7 protein were analyzed with RT-PCR and Western blotting, respectively. RESULTS: Tetrandrine at the concentrations of 0.25-2 mg/L prevented morphological transformation of HSC from the quiescent state to the activated one, while α-SMA, LN and PCⅢ expressions were inhibited. As estimated by gray values, the expression of α-SMA in tetrandrine groups (0.25, 0.5, 1, 2 mg/L) was reduced from 21.3% to 42.2% (control: 0.67, tetrandrine groups: 0.82, 0.85, 0.96, or 0.96, respectively, which were statistically different from the control, P&lt;0.01), and the difference was more significant in tetrandrine at 1 and 2 mg/L. The content of LN in supernatants was significantly decreased in tetrandrine groups to 58.5%, 69.1%, 65.8% or 60.0% that of the control respectively, and that of PCII] to 84.6%, 81.5%, 75.7% or 80.7% respectively (P&lt;0.05 vs control), with no significant difference among tetrandrine groups. RTPCR showed that TGF-β1 mRNA expression was reduced by tetrandrine treatments from 56.56% to 87.90% in comparison with the control, while Smad 7 mRNA was increased 1.4-4.8 times. The TGF-β1 mRNA and Smad 7 mRNA expression was in a significant negative correlation (r = -0.755, P&lt;0.01), and both were significantly correlated with α-SMA protein expression (r = -0.938, P&lt;0.01; r = 0.938, P&lt;0.01, respectively). The up-regulation of Smad 7 protein by tetrandrine (1 mg/L) was confirmed by Western blotting as well. CONCLUSION: Tetrandrine has a direct inhibiting effect on the activation of rat HSCs in culture. It up-regulates the expression of Smad 7 which in turn blocks TGF-β1 expression and signaling.     

黄芩甙抗肝星状细胞增殖及胶原合成的作用

目的研究黄芩甙对大鼠肝星状细胞活化、增殖及细胞外基质合成的作用,探讨黄芩甙抗肝纤维化的机制。方法采用胶原酶循环灌流法和密度梯度离心法分离肝星状细胞。不同浓度黄芩甙作用后,通过观察细胞贴壁及细胞形态变化情况来检测细胞活化：采用MTT法检测细胞增殖;免疫细胞化学法检测Ⅰ、Ⅲ型胶原及层粘连蛋白的合成。结果黄芩甙（75～1200μg/mL）可抑制HSC活化,MTT法示75μg／mL、150μg／mL、300μmL、600μg／mL、1200μg／mL黄芩甙作用于HSC的A值分别为（0．060±6．53）×10^-2、（0．052±7．38）×10^9、（0．036±1．26）×10^-3、（0．023±1．72）×10^-3、（0．013±4．01）×10^-3,空白对照组A值为（0．065±1．32）×10^4,F值=1147．611,P〈0．05。黄芩甙可抑制活化的HSC增殖,减少HSCⅠ、Ⅲ型胶原及层粘连蛋白合成。结论黄芩甙抗肝纤维化作用主要机制可能为黄芩甙抑制肝星状细胞活化、增殖,抑制细胞胶原蛋白及糖蛋“等细胞外基质合成.     

内毒素受体在肝星状细胞的表达及其作用

目的了解内毒素受体在肝星状细胞活化中的变化和作用。方法分离正常大鼠的肝星状细胞，以逆转录聚合酶链反应法检测其在体外培养过程中内毒素受体（CD14和TLR4）mRNA的表达变化。以细胞免疫染色法检测肝星状细胞内毒素受体CD14的表达。制作肝纤维化和肝硬化的大鼠模型，免疫组织化学法动态检测肝组织内CD14和α平滑肌肌动蛋白的表达变化和定位。结果初分离的肝星状细胞表达低水平的CD14 mRNA，不表达TLR4 mRNA，培养活化的肝星状细胞内毒素受体的表达增强，内毒素可上调这种表达。体外培养10d的肝星状细胞表达CD14蛋白，内毒素作用后CD14表达更明显。在肝纤维化的发展过程中，肝组织内CD14阳性细胞增多，阳性细胞多分布于肝窦周围，晚期CD14阳性细胞聚集在纤维隔内，与α平滑肌肌动蛋白阳性细胞的分布一致。结论肝星状细胞在体内外的活化过程中内毒素受体的表达增强，因此，内毒素受体可能参与肝星状细胞在肝脏炎症和纤维化中的作用。     

MicroRNAs在肝星状细胞活化过程中表达差异谱的研究

目的 应用MicroRNAs基因芯片技术筛选静止和活化肝星状细胞差异表达的MicroRNAs.方法 用链酶蛋白酶和胶原酶原位灌流,Nycodenz密度梯度离心分离大鼠HSCs,并进行体外培养,借助荧光倒置显微镜观察细胞形态,MicroRNAs基因芯片技术和荧光定量PCR检验MicroRNAs在HSCs静止期(2天)和活化期(14天)的表达.结果 HSCs的miRNAs表达谱中差异表达miRNAs共21个,其中上调12个,下调9个(P＜0.01);荧光定量RT-PCR证实其表达水平在静止和活化期肝星状细胞中均有差异(P＜0.01).结论 MicroRNAs基因芯片筛选差异表达miRNAs可望为肝纤维化的基因治疗提供全新的靶标和策略,为肝纤维化的发病机制和诊断治疗研究提供了新的思路.     

Effects of interleukin-10 on activation and apoptosis of hepatic stellate cells in fibrotic rat liver

AIM:To study the effects of interleukin-10(IL-10)on the expression of α-smooth muscle actin(α-SMA),nuclear factor-κB(NF-κB)and Fas/Fas ligand(FasL)inhepatic stellate cells of experimental rats with hepaticfibrosis.METHODS:Sixty clean SD rats were randomly dividedinto control group(group N),liver fibrotic group(groupC)and IL-10 treatment group(group I).Control groupreceived intraperitoneal injection of saline(2ml·kg~(-1)),twicea week.Fibrotic group was injected intraperitoneallywith 50% carbon tetrachloride(CCl_4)(2 ml·kg~(-1)),twicea week.IL-10 treatment group was given IL-10 at adose of 4 μg·kg~(-1)20 minutes before CCl_4 administrationfrom the third week.Hepatic stellate cells(HSCs)wereisolated from these rats at the seventh and eleventhweeks during the course of liver fibrosis,respectively.The expression of α-SMA and NF-κB in HSCs wasmeasured by S-P immunohistochemistry.The expressionof Fas and FasL mRNA was measured by RT-PCR.Furthermore,liver tissues were harvested from threegroups at the same time.RESULTS:The CCl_4- induced experimental rat hepaticfibrosis model was established successfully.The purityof extracted hepatic stellate cells was about 95% andthe yield of hepatic stellate cells was 1.2-2.3×10~6/g livertissue averagely.The positive expression of α-SMA andNF-κB was 36.5% and 28.5% respectively in group N.The positive levels of α-SMA and NF-κB were increasedsignificantly in group C compared to group N(P<0.01).The positive signals decreased significantly(P<0.05)ingroup I.In the 11~(th)week,the HSCs of group I becameround with visible pyknotic nuclei.The expression ofNF-μB in group C was significantly increased in a time-dependentmanner(P<0.01),but there was no difference in the α-SMA expression(P>0.05).The mRNA of Fasand FasL in group C was significantly increased in a time-dependent manner compared to that in control group.After treated with IL-10,the expression level of Fas andFasL was higher in group I than in group C.CONCLUSION:The positive expression of α-SMA andNF-κB in hepatic stellate cells is decreased by ectogenicIL-10 in liver fibrosis induced by CCl_4.The expression ofFas and FasL is increased in the course of liver fibrosis,and is further increased by IL-10.IL-10 could inhibitthe activation of HSCs and cause apoptosis of activatedHSCs.     

大鼠纤维化肝组织中PTEN的动态表达及其与肝星状细胞增殖和活化的关系

目的 探讨第10号染色体缺失的磷酸酶张力蛋白同源物基因(PTEN)在大鼠纤维化肝组织中的动态表达及其对在体肝星状细胞(HSC)活化、增殖的影响. 方法 采用胆总管结扎法建立大鼠肝纤维化模型;应用免疫组织化学染色、Western blot和实时荧光定量PCR技术测定大鼠肝组织中PTEN的表达;应用免疫荧光双标记共聚焦激光扫描显微术测定大鼠肝组织中活化HSC的PTEN表达;采用免疫组织化学染色检测大鼠肝组织中α-平滑肌肌动蛋白的表达.结果 免疫组织化学染色显示正常大鼠肝组织中PTEN有广泛表达,主要表达于细胞质,随着肝纤维化的发展,PTEN表达逐渐减少(P<0.01),而α-平滑肌肌动蛋白阳性细胞明显增多(P<0.01);造模1、2、3周及4周不同时间大鼠纤维化肝组织中PTEN的mRNA(分别为假手术组的0.66、0.53、0.44和0.37)及蛋白质表达(吸光度比值分别为1.20±0.13,1.07±0.16,0.88±0.08,0.73±0.07)均低于假手术组(P<0.01),并随着肝纤维化的进展逐渐降低(P<0.01);免疫荧光双标记共聚焦激光扫描显微术显示PTEN在活化HSC广泛表达,主要表达于细胞质,随着肝纤维化的进展,表达PTEN的活化HSC占总的活化HSC的比例逐渐减少(P<0.01). 结论 大鼠纤维化肝组织中PTEN的mRNA及蛋白质表达均下调;在体HSC的PTEN表达亦降低;肝组织中PTEN的动态表达与HSC的活化、增殖呈显著负相关.     

选择性COX-2抑制剂塞来昔布对肝星状细胞增殖及活化的影响

目的通过观察选择性COX-2抑制剂塞来昔布对肝星状细胞增殖及活化的影响,以探讨COX-2在肝纤维化中的作用。方法用不同浓度的选择性COX-2抑制剂塞来昔布作用于体外培养的人肝星状细胞株LI-90,采用MTT法和半定量RT-PCR法检测塞来昔布对肝星状细胞增殖及活化的影响。结果塞来昔布可显著抑制体外培养的肝星状细胞LI-90的增殖和活化,随着药物剂量的增加和时间的延长,肝星状细胞LI-90的增殖和活化明显抑制,呈剂量和时间依赖性。结论塞来昔布对肝星状细胞增殖和活化的抑制作用是研究肝纤维化预防和治疗的重要方向之一。     

Hedgehog-Gli 1信号通路对肝星状细胞增殖和凋亡的调控作用

目的 研究肝星状细胞(HSC)中hedgehog(Hh)信号通路成员Shh、patched、smoothened(Smo)和Gli-1的表达,及Hh通路抑制剂环耙明对HSC-T6细胞株增殖、凋亡及其激活的影响.方法 体外培养HSC株,提取细胞总RNA,用RT-PCR扩增Shh、patched、Smo、Gli-1基因;用环耙明作用HSC-T6后采用四甲基偶氮唑盐法检测其在体外对HSC-T6的抑制情况,流式细胞仪检测其对HSC-T6细胞周期的影响,碘化丙啶和膜联蛋白-Ⅴ双染荧光标记法及提取细胞DNA检测HSC-T6细胞凋亡,荧光定量聚合酶链反应检测Gli-1,转化生长因子β1、血小板衍生生长因子、Bcl-2 mRNA的表达水平.结果 HSC-T6中表达有Hh通路家族成员.环耙明在50、100、150、200,250 μmol/L作用下,A值分别为1.55±0.07、1.19 ±0.05,0.78±0.06、0.48±0.03、0.38±0.04,正常对照组为1.74±0.03,环耙明组与正常对照组相比,F=636.81,P<0.01,差异有统计学意义.流式细胞术测出干预后环耙明G0/G1期细胞所占比例为65.08%±1.50%,正常对照组为55.41%±2.54%,两组比较,t=-8.05,P<0.01.药物干预后提取DNA及碘化丙啶和膜联蛋白-Ⅴ双染荧光标记均检测出HSC-T6细胞凋亡.荧光定量结果表明,经环耙明干预后,HSC-T6细胞中Gli-1、转化生长因子β1、血小板衍生生长因子、Bcl-2 mRNA的目的基因相对表达量分别0.28±0.05、0.13±0.04、0.07±0.04、0.17±0.02,正常对照组为1,各基因表达量较正常对照组均明显降低,t值分别为23.09、31.34、43.87和59.10,P值均<0.01,差异有统计学意义.结论 HSC-T6中存在Hh信号通路,环耙明能抑制HSC增殖及增殖周期,促进活化的HSC凋亡,其抑制HSC活化可能是通过抑制Hh-Gli-1信号通路的结果.     

洛伐他丁对肝星状细胞增殖及细胞外基质分泌的影响

目的 观察洛伐他丁对肝星状细胞增殖及细胞外基质分泌的影响,并探讨其作用机制。方法 用不同浓度的洛伐他丁和胆固醇合成过程中产生的非脂性中间产物香叶基香叶基焦磷酸处理大鼠肝星状细胞株;用MTT法检测细胞增殖,流式细胞仪检测细胞周期,ELISA检测细胞外基质IV型胶原和层粘连蛋白,免疫细胞化学结合计算机图文分析系统检测c—jun、c-fos基因表达。结果 洛伐他丁可剂量依赖性地抑制肝星状细胞增殖（对照组A值24 h和48 h分别为0.736±0.090和0.972±0.097,洛伐他丁浓度在10μmol/L时24h和48h分别为0.602±0.049和0.785±0.028,两组比较差异有显著性）,影响其细胞周期,使G0/G1期细胞增多,S期细胞减少,并明显抑制c-jun、c—fos表达（洛伐他丁浓度在 50μmol/L时分别较对照组降低51.5％和 54.5％）,抑制IV型胶原和层粘连蛋白分泌（P<0.01）。而香叶基香叶基焦磷酸可部分拮抗洛伐他丁的上述抑制作用。结论 洛伐他丁可显著抑制肝星状细胞增殖及细胞外基质分泌,其机制可能与抑制香叶基香叶基焦磷酸产生而阻止信号转导有关。     

舒肝颗粒对大鼠肝星状细胞增殖及胶原分泌的影响

目的:观察舒肝颗粒对肝星状细胞(hepatic stellate cell,HSC)增殖及胶原分泌的影响.方法:体外培养HSC-T6.设空白对照组、正常对照组和舒肝颗粒干预组,其中,舒肝颗粒干预组设7个浓度梯度.前两者加入无血清的RPMI 1640胞培养液,后者加入含舒肝颗粒的无血清RPMI 1640细胞培养液,药物终浓度分别为0.56、0.28、0.14、0.07、0.035、0.018和0.009 g/L.采用MTT法检测细胞增殖,ELISA法检测Ⅰ、Ⅲ及Ⅳ型胶原含量.结果:经48 h,舒肝颗粒干预组HSC抑制率分别为48.59%、38.24%、28.12%、21.15%、8.47%、7.26%和0.33%,明显高于正常对照组,且呈剂量效应关系.舒肝颗粒干预组细胞上清液中Ⅰ、Ⅲ、Ⅳ型胶原含量较正常对照组明显降低(5.437 μg/L±0.043 μg/L、3.26μg/L±0.217μg/L、2.18μg/L±0.245μg/L vs 13.817μg/L±0.787μg/L、8.629μg/L±0.178μg/L、5.29μg/L±0.315μg/L,均P<0.01).结论:舒肝颗粒可通过抑制HSC增殖和胶原蛋白的分泌,减少胶原纤维在肝脏内的沉积,这可能是其抗肝纤维化的作用机制之一.     

异甘草酸镁对大鼠肝星状细胞增殖和氧应激的影响

目的探讨异甘草酸镁对大鼠肝星状细胞(HSC)增殖和氧应激的影响。方法通过绘制细胞生长曲线和四甲基偶氮唑盐法检测不同浓度的异甘草酸镁对原代HSC和HSC株增殖的影响,并同时观察其形态变化。通过检测次氮基三乙酸铁(Fe-NTA)作用于以不同浓度异甘草酸镁培养的HSC:24 h后上清液中超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量,观察异甘草酸镁对HSC氧应激的影响。结果同对照组比较,一定浓度范围的异甘草酸镁对HSC的增殖具有显著的抑制作用。在Fe-NTA诱导的氧应激中,一定浓度范围的异甘草酸镁可有效提高HSC的 SOD活性和降低MDA含量。结论异甘草酸镁对HSC的增殖具有明显的抑制作用,并且对Fe-NTA诱导的氧应激具有保护作用。