Rho激酶抑制剂Y27632对脓毒症大鼠肠屏障功能障碍的影响

目的 研究Rho激酶抑制剂Y27632对脓毒症大鼠肠屏障功能障碍的影响及机制.方法 SD大鼠分为4组:假手术组、Y27632对照组、模型组、实验组,每组8只.以盲肠结扎穿孔法建立脓毒症大鼠模型,假手术组和Y27632对照组只进行开腹手术而不进行盲肠结扎和穿孔;Y27632对照组和实验组造模前15 min腹腔注射Y276...     

红枣多糖对人肝癌 HepG2细胞的抑制作用

目的：研究红枣多糖对体外培养肝癌细胞增殖的抑制作用并初步探究其可能的作用机理。方法采用M T T法测定红枣多糖对体外培养的人肝癌细胞HepG2增殖的抑制作用;流式细胞术检测红枣多糖对人肝癌细胞HepG2周期和凋亡的影响;Real time RT-PCR检测红枣多糖对人肝癌细胞HepG2中Bcl-2和caspase3 mRNA表达的影响。结果 MTT检测发现随着药物浓度的增高OD值呈现梯度递减,红枣多糖对 HepG2的IC50＝13 mg／mL ,最高浓度40 mg／mL下所得最大抑制率为68．79％;流式细胞仪检测细胞凋亡结果可见早期凋亡率随药物浓度的增加而变大;流式细胞周期分析结果可见G0-G1期细胞数逐渐增多,S期细胞数有下降趋势,并有剂量依赖性;Real time RT-PCR检测发现Bcl-2凋亡抑制基因mRNA表达随药物浓度增高而降低,而凋亡关键基因caspase-3 mRNA的表达随药物浓度增高而升高。结论红枣多糖对体外培养的肝癌细胞增值具有抑制作用,将肝癌细胞HepG2阻滞于G1期,并通过下调Bc 1-2而上调caspase-3 mRNA表达诱导 HepG2细胞凋亡。     

大蒜辣素对HepG2肝癌细胞增殖的抑制作用

目的:研究大蒜辣素(Allicin)对肝癌HepG2细胞增殖的影响。方法:采用高效液相色谱法提纯Allicin,运用细胞计数试剂盒(Cell counting kit-8,CCK-8)研究Allicin对HepG2细胞增殖的影响,运用流式细胞仪研究其对细胞凋亡、DNA代谢的影响,运用Western blot研究其对细胞凋亡基因表达的影响。结果:Allicin经HPLC法提纯后其纯度达到99%;Allicin能抑制HepG2细胞的增殖,导致细胞大量凋亡及死亡,凋亡率达到8.67%±3.2%,死亡率达到70.38%±1.8%;也导致细胞DNA代谢发生紊乱,使大部分细胞处于DNA合成的G0/G1期并使进入S期细胞含量减少,延缓细胞增殖。Western blot实验结果表明,Allicin能导致细胞凋亡相关蛋白大量表达。结论:Allicin能抑制肝癌细胞的增殖,导致细胞大量死亡并引发细胞凋亡,并引起细胞DNA代谢发生紊乱,细胞大部分被阻滞在DNA合成的G0/G1期,Western blot实验结果表明,细胞凋亡基因相关蛋白Bax大量表达,而Bcl-2表达降低。     

大黄酸金属配合物的结构及对人肝癌HepG2细胞增殖的抑制作用

目的:以大黄酸和相应金属盐为原料,合成3种金属配合物,并对其结构进行表征,比较其抗癌活性大小。方法:采用核磁共振氢谱法、红外光谱法、紫外光谱法、滴定法、原子吸收光谱法进行结构表征;采用MTT法测试三种配合物对于人肝癌Hep G2细胞的抑制作用。结果:通过光谱法证实有配合物生成,并推测出其可能结构。MTT测试显示配合物和配体均具有一定的抗癌活性,其中大黄酸-Fe(Ⅲ)抗癌活性最强,其IC50值达17.44μg.m L-1,优于配体大黄酸(IC50=116.741μg.m L-1),大黄酸-Cu(Ⅱ)(IC50=54.427μg.m L-1),大黄酸-Cr(Ⅲ)(IC50=63.584μg.m L-1)。结论:大黄酸金属配合物抗癌活性相比配体增强。     

大蒜素联合替加氟对人HepG2肝癌细胞增殖的影响

目的观察大蒜素联合替加氟对人HepG2肝癌细胞增殖的影响。方法体外培养人HepG2肝癌细胞,细胞分为4组:对照组、大蒜素组、替加氟组和联合组,于培养24和48 h后,MTT法检测大蒜素、替加氟及两药联合对人HepG2肝癌细胞增殖的影响。结果大蒜素组和替加氟组的细胞增殖抑制率均明显高于对照组(P<0.05),联合组细胞增殖抑制率明显强于单独用药组(P<0.05)。结论大蒜素联合替加氟能够显著抑制人HepG2肝癌细胞的增殖。     

迷迭香酸联合槲皮素对人肝癌HepG2细胞增殖和迁移的影响

目的探讨迷迭香酸联合槲皮素对人肝癌 HepG2细胞增殖、侵袭力的影响,并探讨其可能的机制。方法以不同浓度迷迭香酸(12.5、25.0、50.0和100.0 μmol/L)和槲皮素(12.5、25.0、50.0和100.0 μmol/L)单药及二者联合用药处理 HepG2细胞 36 h,用四甲基偶氮唑盐微量酶反应比色法(MTT法)检测细胞增殖,划痕实验检测细胞迁移能力,蛋白质印迹法检测凋亡相关蛋白 E-钙黏蛋白(E- cad)及N-钙黏蛋白(N-cad)的表达情况。结果槲皮素和迷迭香酸单药均能使细胞活力降低,二者联合用药对细胞活力抑制率更加显著,且呈剂量依赖性( P＜0.05)。 25 μmol/L迷迭香酸组及25 μmol/L槲皮素组划痕愈合距离分别为( 11.35±2.37)mm、(11.46±     

姜黄素对肝癌HepG2和Bel-7404细胞增殖的抑制作用

目的研究姜黄素对人肝癌HepG2和Bel-7404细胞增殖的影响。方法不同浓度的姜黄素(2.5,10.0,25.0,50.0,100.0μg/mL),0.2%二甲基亚砜的RPMI 1640培养基加细胞为空白对照,2μg/mL顺铂为阳性对照。MTT法检测肝癌HepG2和Bel-7404细胞的增殖。结果姜黄素对肝癌细胞HepG2和Bel-7404的增殖抑制有量效关系,并呈时间依赖性。在相同作用时间下,姜黄素组、顺铂组对肝癌细胞HepG2和Bel-7404增殖有明显的抑制作用,与空白对照组比较均有显著性差异(P<0.05)。与空白对照组比较,2.5,10.0μg/mL姜黄素对肝癌细胞HepG2和Bel-7404的增殖没有明显的抑制作用(P>0.05),而25.0,50.0,100.0μg/mL姜黄素以及顺铂组对肝癌细胞HepG2和Bel-7404的增殖均有明显的抑制作用(P<0.05)。结论姜黄素可以明显的抑制肝癌细胞HepG2和Bel-7404的生长,且存在剂量-时间的关系。     

美洛昔康对人肝癌HepG_2细胞增殖的抑制作用

目的:研究环氧合酶(COX)-2抑制剂美洛昔康对肝癌细胞HepG2的生长抑制作用及其作用机制。方法:MTT法观察美洛昔康在不同浓度和作用时间下对细胞增殖的抑制作用;免疫细胞化学染色检测细胞增殖核抗原(PCNA)的表达;DNA原位末端标记(TUNEL)法和流式细胞术(FCM)检测细胞凋亡。结果:美洛昔康可抑制人肝癌细胞HepG2增殖;TUNEL及FCM检测结果均显示美洛昔康可诱导HepG2细胞凋亡。结论:美洛昔康可通过抑制细胞增殖和诱导凋亡2种途径抑制人肝癌细胞HepG2的生长。     

澳洲茄边碱对肝癌 HepG2细胞增殖及凋亡的影响

目的：探讨澳洲茄边碱（SM ）对 HepG2细胞增殖、凋亡的影响及其可能作用机制。方法用不同浓度SM 5、10、15和20μg／ml分别处理 HepG2细胞3、6、12和24 h ,并设不加药的对照组。采用MTT法检测 HepG2细胞增殖,DAPI染色法观察细胞核形态的变化,流式细胞术检测细胞凋亡和周期,Western blot法检测B细胞淋巴瘤‐白血病2（Bcl‐2）、Bcl相关X蛋白（Bax）、半胱天冬氨酸蛋白酶3（Caspase‐3）及Ki67的蛋白表达。结果与对照组相比,SM 呈剂量依赖性地抑制HepG2细胞增殖,促进HepG2细胞凋亡,将细胞周期阻滞于G2／M期,并且上调Bax和Caspase‐3蛋白表达,下调Bcl‐2和Ki67蛋白表达（P＜0．05或P＜0．01）。结论 SM 能有效抑制 HepG2细胞的增殖,促进细胞凋亡的发生;SM上调Bax和Caspase‐3表达,下调Bcl‐2和Ki67表达,细胞周期阻滞于G2／M期可能是其发挥上述作用的机制。     

蓝萼甲素对人肝癌细胞HepG2细胞株的作用

目的观察蓝萼甲素对人肝癌细胞HepG2的抑制和诱导细胞凋亡作用。方法不同浓度蓝萼甲素处理HepG2细胞后,MTT检测24h,48h细胞生长抑制率,LDH试剂盒检测细胞LDH释放量,倒置显微镜观察细胞形态,RT-PCR法对凋亡相关基因Bc-l 2,bax和c-myc的mRNA表达进行检测,流式细胞仪检测细胞凋亡率。结果在1.25~20μmol.L-1剂量范围内,蓝萼甲素对HepG2的生长有显著抑制作用,并呈剂量依赖性。蓝萼甲素5,10,20μmol.L-1能够使HepG2培养液中的LDH释放量显著增加,倒置相差显微镜观察,可见细胞明显皱缩。同时蓝萼甲素可使细胞Bc-l2表达减少,Bax表达增加,c-myc表达减少。结论蓝萼甲素可抑制HepG2细胞增殖并诱导其凋亡,其机制可能与调控Bc-l2,Bax,c-myc的mRNA的表达有关。     

The effect of a Rho kinase inhibitor Y-27632 on superoxide production, aggregation and adhesion in human polymorphonuclear leukocytes

We investigated the involvement of p160ROCK (a Rho-associated coiled coil-forming protein kinase), one of Rho kinases on superoxide anion production (O(2)(-) production), aggregation and adhesion of human polymorphonuclear leukocytes under physiological condition, using a selective p160ROCK inhibitor, (+)-(R)-trans-4-(1-aminoethyl)-N-(4-pyridyl)cyclohexanecarboxamide (Y-27632). Y-27632 inhibited the O(2)(-) production stimulated by phorbol-12-myristate-13-acetate (PMA) in a dose-dependent manner. Stauroprorine blocked the PMA-induced O(2)(-) production while wortmannin did not. Y-27632 also inhibited the O(2)(-) production by guanosine 5'-O-(3-thiotriphosphate) (GTP(gamma)S) 100 microM. N-formyl-Met-Leu-Phe (fMLP)-induced O(2)(-) production was not influenced by Y-27632, but was inhibited by wortmannin. The enhanced O(2)(-) production by Ca-ionophore A23817 and thapsigargin was not inhibited by Y-27632. Y-27632 did not change the basal intracellular Ca(2+) concentration nor its elevation stimulated by fMLP. Polymorphonuclear leukocytes aggregation induced by PMA was dose-dependently decreased by Y-27632 while their aggregation stimulated by fMLP was enhanced by the agent. Polymorphonuclear leukocytes adhesion induced by PMA or fMLP was not influenced by Y-27632.These results suggest that p160ROCK is involved in the PMA-induced O(2)(-) production and aggregation in human polymorphonuclear leukocytes. This kinase might locate in downstream of protein kinase C in polymorphonuclear leukocytes.     

Partial protective effect of Y-27632, a Rho kinase inhibitor, against hepatic ischemia-reperfusion injury in rats

(+)-(R)-trans-4-(1-aminoethyl)-N-(4-pyridyl)-cyclohexanecarboxamide dihydrochloride (Y-27632), a Rho kinase inhibitor, has a suppressive effect on the functions of polymorphonuclear leukocytes. In this study, the influence of Y-27632 on ischemia-reperfusion injury of the liver was examined in rats. Y-27632 (3 mg/kg) or vehicle alone was intravenously injected into rats 60 min before occlusion. Blood samples were obtained for 48 h after reperfusion. At the end of the experiment, the hepatic content of myeloperoxidase, which reflects the number of polymorphonuclear leukocytes in liver tissues, was determined. The increases in serum hepatic aminotransferases and inflammatory cytokines [tumor necrosis factor-alpha (TNF-alpha), interleukin (IL)-6] after reperfusion were partially, but significantly, inhibited by Y-27632. The increased hepatic myeloperoxidase content was significantly lowered by Y-27632. These results suggest that Y-27632 has a partial protective effect against hepatic ischemia-reperfusion injury through the suppression of polymorphonuclear leukocytes and inflammatory cytokines.     

白藜芦醇对人肝癌细胞系HepG2抑制作用的探讨

目的:观察白藜芦醇(Res)对体外培养的人肝癌细胞系HepG2生长增殖的影响.方法:采用MTT法、流式细胞仪分析Res对肝癌细胞系HepG2细胞生长的影响及其细胞周期的变化,并且检测端粒酶的活性.结果:Res对肝癌细胞系HepG2的增殖具有抑制作用,IC50为5.91mg/L,流式细胞仪显示,Res能引起肝癌细胞系HepG2细胞的S期阻滞,Res也能显著地抑制端粒酶的活性.结论:Res通过改变肝癌细胞系HepG2细胞的细胞周期分布来抑制人肝癌细胞系HepG2细胞的生长.     

麒麟菜提取物对HepG2、H22肝癌细胞的抗癌作用及机制研究

目的从麒麟菜中提取天然海藻色素糖蛋白(NSPG),并观察其抗肿瘤作用。方法应用溶剂浸提法从麒麟菜中提取NSPG,应用IR、UV、液相-质谱法、凝胶色谱法测定NSPG样品的分子量及结构特征等。采用MTT比色法测定NSPG作用后HepG2人肝癌细胞、小鼠H22肝癌细胞的体外活性。结果本研究建立了常温下从麒麟菜中提取NSPG的方法,并测定其理化性质。人HepG2肝癌细胞体外实验结果显示,50、100 mg/L NSPG组培养48 h的细胞增殖活性分别为0.62±0.02、0.54±0.01,低于空白对照组(0.87±0.01),差异有统计学意义(P<0.05);小鼠H22肝癌细胞体外实验结果显示,NSPG对肿瘤细胞的增殖活性随NSPG浓度的升高而逐渐降低,抑制率逐渐升高,低、中剂量组的增殖活性、抑制率与高剂量组比较差异有统计学意义(P<0.05)。结论 NSPG对HepG2人肝癌细胞、小鼠H22肝癌细胞表现出不同程度的肿瘤抑制作用。     

Inhibition of agonist-induced positive inotropy by a selective Rho-associated kinase inhibitor,Y-27632

We examined the effect of Y-27632 ((+)-(R)-trans-4-(1-aminoethyl)-N-(4-pyridyl)cyclo-hexanecarboxamide), a selective Rho-associated kinase (ROCK) inhibitor, on agonist-induced inotropy in isolated mouse left atria. Endothelin-1, angiotensin-II, and prostaglandin F(2)(alpha) (PGF(2)(alpha)) produced positive inotropy, which was significantly attenuated by Y-27632 (100 microM). On the other hand, isoproterenol-induced positive inotropy was not attenuated by the drug. These results provide the first evidence that the Rho/ROCK pathway is involved in endothelin-1-, angiotensin-II-, and PGF(2)(alpha)-induced positive inotropy, but not in beta-adrenoceptor-mediated positive inotropy.     

Rho-kinase inhibitor, Y-27632, has an antinociceptive effect in mice

The possible antinociceptive effect of a Rho-kinase inhibitor, (+)-(R)-trans-4-(1-aminoethyl)-N-(4-pyridyl) cyclohexanecarboxamide dihydrochloride monohydrate (Y-27632), was investigated in mice by using the hot-plate and abdominal constriction response (writhing) tests. In addition, the expression of Rho-kinase protein (ROCK-2) was studied in the mouse brain and spinal cord by Western blotting. Male balb/c mice (n=8, for each group) were used in the experiment. Hot-plate latency and the number of writhes were recorded in control and in Y-27632-treated (1-5 mg/kg, i.p.) groups. Y-27632 (1 mg/kg) did not affect hot-plate latency; however, it considerably diminished the number of writhes, from 89+/-12 in control to 30+/-6 in the mice treated with 1 mg/kg Y-27632 (P=0.001). At a higher dose (5 mg/kg), Y-27632 prolonged the hot-plate latency from 8.7+/-1.0 s to 14.4+/-1.7 s (P=0.005) and decreased the number of writhes from 80+/-8 to 24+/-7 (P=0.002). Western blot analysis revealed that mouse spinal cord and brain homogenates expressed ROCK-2 protein. These results indicate that Rho-kinase may be involved in nociception and that its inhibitors, such as Y-27632, may represent a new type of antinociceptive drug.     

虫草素对人肝癌Bel-7402细胞抑制及作用机制的研究

<正>虫草素是虫草的主要活性成分,具有抗肿瘤、抑菌、抑制病毒、抑制蛋白质激酶活性等作用[1-2]。研究证明虫草素能抑制mRNA的合成,诱导细胞凋亡,促进细胞分化,对多种肿瘤细胞的生长具有抑制作用[1-2]。诱导肿瘤细胞凋亡以及作用靶点已成研究的焦点。为探讨虫草素诱导肿瘤细胞凋亡的新靶点,对虫草素作用人肝癌Bel-7402细胞后的抑制     

Copper toxicity affects proliferation and viability of human hepatoma cells (HepG2 line)

In Wilson's disease and Indian childhood cirrhosis (ICC) copper accumulates in the liver resulting in poor hepatocyte regeneration and fibrosis. An inhibition of hepatocyte proliferation and an increase in cell death could account for these outcomes. To establish how the toxicity of this metal ion impacts upon the proliferation and viability of the HepG2 cells they were cultured in 4-32 microM copper(II) sulphate (CuSO4)). These levels were comparable to the circulatory and tissue concentrations of copper recorded for these two diseases. Specific uptake comparable to levels of copper recorded in the livers of patients with Wilson's disease and ICC was measured in the HepG2 cells. After 48 h acid vesicle function increased from 4 to 32 microM Cu2+ but significantly declined at 64 microM compared to the controls. Lysosomal acid phosphatase showed a concentration dependent decline in activity at 72 h. Cellls exposed to 64 microM Cu2+ had a potential doubling time (Tpot) 21 h longer than the control cells due to a prolonged DNA synthesis phase. At 64 microM Cu2+, increases of necrosis up to 18% were seen whereas comparable levels of apoptotic and necrotic cells (<5%) were seen below this concentration. Chronic exposure over 8 weeks impaired colony-forming efficiency at concentrations of 16 microM Cu2+ and above. This study suggests that when liver cells sequester large amounts of copper, the toxic effects include delayed cell-cycle progression, a gradual loss of replicative capacity, and an increased incidence of cell death.