小鼠腹水癌细胞脂酶的亲和制备及一些性质的研究

在接种了血癌(L—7712)及腹水癌(Hep.A)的小鼠腹水癌细胞中存在远高于正常细胞的脂酶(Lipase)活力.本文通过免疫亲和层析方法从小鼠腹水癌细胞中纯化了该脂酶,比活力达到2000国际单位/mg.蛋白.经 SDS 聚丙烯酰胺凝胶电泳分析,纯度达电泳纯,为单亚基酶.分子量65kd.经等电聚焦电冰分析,等电点(PI)为5.3.     

Effect of protein kinase C activation and depletion on insulin stimulation of glycogen synthesis in cultured hepatoma cells

Summary Insulin stimulation of glycogen synthesis was nearly abolished in hepatoma cells shortly treated with 4 ß-phorbol 12 \-myristate, 13 -acetate (protein kinase C activation) but remained unmodified in cells chronically treated with the phorbol ester (protein kinase C depletion). Thus, although exogenous activation of protein kinase C results in an inhibition of insulin action, protein kinase C depletion has no influence on this process. The results suggest that, in hepatoma cells, no endogenous activation of protein kinase C may occur in response to the signal triggered by insulin.     

质酸金的合成及性质研究

为获得透明质酸新的功能,对其进行结构修饰.以氯金酸、透明质酸钠为原料合成质酸金.通过元素分析、冷场扫描电子显微镜、傅里叶变换红外光谱和核磁共振分析对其结构进行了表征,对肺癌细胞A549、肝癌细胞BEL7402增殖影响进行了研究.结果表明,在高剂量下对肝癌细胞BEL7402的增殖有明显的抑制活性,对肺癌细胞A549的增殖有边缘抑制活性.     

可跨膜SOD对肝癌及正常肝细胞增殖的作用

可跨膜融合蛋白PTD-SOD与肝癌细胞和正常肝细胞共培养,使细胞内SOD活力分别增加了52%和23%,提高胞内总抗氧化能力(T-AOC)水平达100%,同时降低ROS水平.实验结果显示,肝癌细胞增殖受到显著抑制,最高抑制率达91.91%,对正常肝细胞抑制率较小,为45.50%.     

影响体细胞核移植重构胚发育的因素

目前已有多种动物被成功克隆,但存在着诸多未知因素,使体细胞核移植重构胚发育至囊胚阶段的比例过低,克隆动物存在早衰等异常现象.该文围绕这产生这些现象的根本原因、高度分化的体细胞核移入卵质后所发生的分子事件以及其影响因素如体细胞的来源和培养代数、细胞周期、核质相互作用、细胞核再程序化、线粒体等方面对体细胞核移植重构胚发育的影响等进行综述.     

HAb18G/CD147-mediated calcium mobilization and hepatoma metastasis require both C-terminal and N-terminal domains

HAb18G/CD147 is a heavily glycosylated protein containing two immunoglobulin superfamily domains. Our previous studies have indicated that overexpression of HAb18G/CD147 enhances metastatic potentials in human hepatoma cells by disrupting the regulation of store-operated Ca²⁺ entry by nitric oxide (NO)/cGMP. In the present study, we investigated the structure-function of HAb18G/CD147 by transfecting truncated HAb18G/CD147 fragments into human 7721 hepatoma cells. The inhibitory effect of HAb18G/CD147 on 8-bromo-cGMP-regulated thapsigargin-induced Ca²⁺ entry was reversed by the expression of either C or N terminus truncated HAb18G/CD147 in T7721C and T7721N cells, respectively. The potential effect of HAb18G/CD147 on metastatic potentials, both adhesion and invasion capacities, of hepatoma cells was abolished in T7721C cells, but not affected in T7721N cells. Release and activation of matrix metalloproteinases (MMPs), MMP-2 and MMP-9, were found to be enhanced by the expression of HAb18G/CD147, and this effect was abolished by both truncations. Thapsigargin significantly enhanced release and activation of MMPs (MMP-2 and MMP-9) in non-transfected 7721 cells, and this effect was negatively regulated by SNAP. However, no effects of thapsigargin or SNAP were observed in T7721 cells, and expression of HAb18G/CD147 enhanced secretion and activation of MMPs at a stable and high level. Taken together, these results suggest that both ectodomain and intracellular domains of HAb18G/CD147 are required to mediate the effect of HAb18G/CD147 on the secretion and activation of MMPs and metastasis-related processes in human hepatoma cells by disrupting the regulation of NO/cGMP-sensitive intracellular Ca²⁺ mobilization although each domain may play different roles.Received 1 April 2004; received after revision 15 June 2004; accepted 22 June 2004     

亚甲蓝光敏反应对癌细胞蛋白质及DNA的影响

不同浓度（０．０３８，０．３８，３．８０μｍｏｌ／Ｌ）的亚甲蓝光敏反应，对腹水型肝癌细胞（ＨｅｐＡ）蛋白质及ＤＮＡ分子具有明显的降解作用，并随亚甲蓝浓度的增加而加剧，而过氧化氢酶对细胞有明显的保护作用，说明亚甲蓝光敏反应与Ｈ２Ｏ２密切相关。     

原发性肝癌与非肝脏恶性肿瘤患者中华分枝睾吸虫感染的研究

本文报道原发性肝癌与非肝脏恶性肿瘤患者华枝睾吸虫感染的情况。60例原发性肝癌与59例非肝脏恶性肿瘤患者粪便华枝睾吸虫卵检出阳性率分别为35.0％和15.2％,P<0.05,两者有显著性差异。为比较原发性肝癌与华枝睾吸虫感染和乙型肝炎病毒感染之间的关系,对60例原发性肝癌患者,同时作了HB_5Ag的检测,结果其阳性率分别为35.0％和18.3％,P<0.05,两者差异亦显著。从流行病学上看,我省肝癌高发地区,也是华枝睾吸虫病的高发流行区,两者地区分布上有高度一致性。因而我们认为在原发性肝癌普查过程中,特别在有华枝睾吸虫病流行地区中,应把华枝睾吸虫感染者列为重点观察对象。     

胆红素光敏反应对腹水型肝癌细胞DNA的降解作用

胆红素光敏反应对腹水型肝癌细胞ＤＮＡ合成具有明显的抑制作用，对ＤＮＡ分子具有明显的降解作用降解作用随胆红素浓度的增加，照光时间的延长而加剧。避光组细胞ＤＮＡ分子也有一定的降解，但照光组的降解作用明显高于避光组。