南中国多棘海星乙醇提取物体外抗肿瘤活性作用的初步研究

目的研究多棘海星乙醇提取物对人肿瘤细胞体外生长的影响,为进一步筛选抗肿瘤活性成分提供重要的科学依据。方法用硅胶柱层析法对多棘海星乙醇提取物进行组分分离,采用MTT法观察各个组分对体外培养的人乳腺癌细胞MDA-MB-231、人宫颈癌Hela细胞、鼻咽癌CNE-1细胞等肿瘤细胞株增殖的抑制作用。结果通过硅胶柱层析从多棘海星乙醇提取物中分离得到8个主要组分(Ⅰ～Ⅷ)。MTT结果显示多棘海星乙醇提取物中的4个组分对肿瘤细胞增殖具有抑制作用,其中组分Ⅳ和Ⅷ对MDA-MB-231、Hela和CNE-1细胞的增殖具有非常显著的抑制作用(P<0.01),组分Ⅴ对Hela细胞增殖具有一定的抑制作用(P<0.05),组分Ⅶ则对Hela细胞的增殖具有抑制作用(P<0.01),而组分Ⅰ、Ⅱ、Ⅲ和Ⅵ则对上述3种细胞增殖均无抑制作用(P>0.05)。结论多棘海星乙醇提取物对肿瘤细胞的增殖具有抑制作用,但不同组分对不同的肿瘤细胞株的增殖表现出不同的抑制作用,组分Ⅳ和Ⅷ可能是其主要的抗肿瘤活性成分存在部位。     

1,2,3-三磷酸肌醇抗肿瘤活性研究

目的研究小麦麸皮植酸酶催化植酸水解法所得1,2,3-三磷酸肌醇((1,2,3)InsP3)对荷瘤小鼠抗癌作用及免疫功能的影响。方法小麦麸皮植酸酶催化植酸部分水解,水解产物经分离得到(1,2,3)InsP3。采用小鼠S180移植瘤模型,以环磷酰胺(Cy)为对照,观察(1,2,3)InsP3对小鼠的抗肿瘤效果,并检测其对荷瘤小鼠免疫力的影响。结果(1,2,3)InsP3能抑制小鼠体内S180肿瘤生长,并能显著增强荷瘤小鼠胸腺指数、脾指数、过氧化氢酶(CAT)活力,脾细胞抗体生成能力。结论:(1,2,3)InsP3具有抑瘤和免疫调节作用。     

复合磷脂对延长寿命和改善免疫功能作用的研究

复合磷脂对延长寿命和改善免疫功能作用的研究邵邻相，何新霞，徐根娣，胡燕月，张金燕（浙江师范大学生物系，金华３２１００４）ＥｆｆｅｃｔｓｏｆＣｏｍｐｏｕｎｄＰｈｏｓｐｈａｔｉｄｅｏｎＰｒｏｌｏｎｇｉｎｇＬｉｆｅＳｐａｎａｎｄＩｍｐｒｏｖｉｎｇＩｍｍｕｎ...     

α-生育酚琥珀酸酯抗肿瘤作用的结构基础

α 生育酚琥珀酸酯 (α TOS)是维生素E最主要成份α 生育酚 (α TOH)的一种酯化衍生物。近年来研究发现 ,α TOS除作为维生素E的供应前体外 ,还具有α TOH所不具有的抗肿瘤生物功效。本文将就α TOS抗肿瘤作用构效关系的研究进行综述     

-谷甾醇对H22荷瘤小鼠体内抗肿瘤作用

目的 探讨β-谷甾醇对H₂₂荷瘤小鼠体内抗肿瘤作用及其机制。方法 建立H₂₂荷瘤小鼠模型,将荷瘤小鼠随机分为模型组、环磷酰胺组、β-谷甾醇高、低剂量组,每组10只,连续给药14 d,眼球取血后颈椎脱臼处死,称取H₂₂荷瘤小鼠的实体瘤重,计算抑瘤率、脾指数、胸腺指数,测定血清学指标,并进行肿瘤和脾脏组织病理学观察。结果 与模型组比较,环磷酰胺组、β-谷甾醇高、低剂量组小鼠瘤重减轻,差异均有统计学意义（P<0.05）,环磷酰胺组、β-谷甾醇高、低剂量组小鼠抑瘤率分别为56.1%、53.0%、41.4%;与对照组比较,模型组小鼠血清中白细胞介素-6（IL-6）、血管内皮生长因子（VEGF）水平[分别为（1 112.47±76.15）、（512.75±22.55） pg/mL]明显升高（P<0.05）;与模型组比较,高剂量β-谷甾醇组小鼠血清中IL-6、VEGF水平[分别为（341.31±31.19）、（356.92±19.45） pg/mL]明显下降,而IFN-γ水平[（122.92±13.66） pg/mL]明显升高（P<0.05）;与模型组比较,β-谷甾醇组小鼠肿瘤组织细胞出现一定的坏死区域,肿瘤组织细胞凋亡明显。结论 β-谷甾醇对H₂₂荷瘤小鼠具有一定的抑瘤作用,其机制可能与其对IL-6、IFN-γ和VEGF表达的调节有关。     

水飞蓟宾-磷脂酰胆碱复合物对氯仿所致肝损伤的保护作用

目的 研究水飞蓟宾-磷脂酰胆碱复合物(SPC)对氯仿(CHCl3)所致小鼠肝损伤的保护作用.方法 40只小鼠随机分成4组:正常对照组、CHCl3损伤组、CHCl3 SPC低剂量组、CHCl3 SPC高剂量组.前两组给予羧甲基纤维素钠(CMC-Na)混悬液灌胃,后两组分别给予SPC,连续8 d.最后一天给予SPC后2 h腹腔注射CHCI,致肝损伤,16 h后采血、分离血清,检测血清中ALT、AST活力,测肝组织中MDA和SOD值.结果 损伤组小鼠血清中ALT、AST和肝组织中MDA值明显升高,SPC明显降低血清中ALT、AST值,SPC组肝组织中MDA值降低、SOD活力增加,SPC组与损伤组比较,差异有统计学意义(P<0.05).结论 SPC对CHCl3造成的急性肝损伤有明显的保护作用.     

β-胡萝卜素和亚硒酸钠体外抗肿瘤作用的实验研究

方法：采用细胞株体外培养技术，研究β－胡萝卜素和亚硒酸钠（Ｎａ２ＳｅＯ３）单独／联合对人肝癌细胞株（Ｑ３）和人膀胱癌细胞株（Ｔ２４）生长的影响。以小鼠成纤维母细胞（３Ｔ３）为正常对照细胞株。实验分为：１．β－胡萝卜素组：剂量为３、３０、１００μｍｏｌ／Ｌ，溶剂对照为ＤＭＳＯ；２．亚硒酸钠组：剂量为０．１５、１．５、５．０μｍｏｌ／Ｌ，溶剂对照为生理盐水；３．β－胡萝卜素和亚硒酸钠联合组：剂量为１．５＋０．１５、１５＋１．５、５０＋５．０μｍｏｌ／Ｌ，溶剂对照为ＤＭＳＯ和生理盐水。各实验组均设空白组。分别在实验后２４ｈ、４８ｈ、７２ｈ观察细胞成活率和活细胞蛋白质含量的变化。结果：１．β－胡萝卜素各剂量组对两株肿瘤细胞生长均有明显的抑制作用；２．亚硒酸钠对两株肿瘤细胞的抑制作用较弱，但随作用时间延长和剂量的增加其抑制作用明显增强；３．β－胡萝卜素和亚硒酸钠对Ｑ３细胞株的抑制作用比Ｔ２４细胞株强；４．β－胡萝卜素和亚硒酸钠联合对Ｑ３和Ｔ２４细胞的抑制作用结果提示两者有相加效应。     

磷脂酰肌醇3-激酶/蛋白激酶B信号转导通路在苯醌致HL-60细胞增殖过程中的作用

目的 探讨磷脂酰肌醇3-激酶/蛋白激酶B(PI3K/Akt)信号转导通路在苯醌(BQ)致HL-60细胞增殖中的作用.方法 取对数生长期的HL-60细胞,分为对照组(PBS处理细胞)、BQ染毒组(3 μmol/L BQ染毒)、LY294002+BQ染毒组(3μmol/L BQ染毒前加20 μmol/L LY294002),用alamar blue 法检测细胞增殖率,免疫印迹(Western blot)法检测细胞内p-Akt、Akt蛋白的表达,流式细胞仪检测细胞周期情况.结果 BQ染毒组细胞增殖率(185.00%±30.00%)和S、G2期细胞比例(分别为48.23%±1.37%、15.40%±1.21%)均高于对照组(分别为100.00%±0.00%、42.47%±0.45%、5.40%±0.40%),G1期细胞比例(36.37%±0.40%)低于对照组(52.13%±0.75%),差异均有统计学意义(P＜0.05);BQ染毒组细胞内p-Akt蛋白表达量明显高于对照组,差异有统计学意义(P<0.05),Akt表达量与对照组的差异无统计学意义(P＞0.05).LY294002+BQ染毒组细胞增殖率(82.59%±15.00%)和S、G2期细胞比例(分别为42.03%±0.50%、3.87%±0.47%)比BQ染毒组低,G1期细胞比例(54.43%±0.40%)比BQ染毒组高,差异均有统计学意义(P<0.05),细胞内p-Akt蛋白表达量明显低于BQ染毒组,差异有统计学意义(P<0.05);Akt蛋白表达量与BQ染毒组的差异无统计学意义(P>0.05).结论 PI3K/Akt信号转导通路在BQ致HL-60细胞增殖过程中可能起着重要作用.

Abstract：

Objective To explore the effects of phosphatidylinositol 3-kinase/ Serine-threonine kinase (PI3K/Akt) signal pathway on the proliferation of HL-60 cells exposed to benzoquinone (BQ). Methods HL-60 cells were divided into 3 groups: control group (treated with PBS), BQ group (treated with 3 μmol/L BQ) and LY294002 plus BQ group (treated with 20 μmol/L LY294002 plus 3 μmol/L BQ). The cell proliferation was measured with alamar blue dye assay. Western blot assay was used to detect the expression of p-Akt and Akt proteins and flow cytometer was used to observe the cell cycle. Results The cell proliferation rate and the cell proportion in the S, G2 phase of BQ group were 185.00%±30.00%, 48.23%±1.37% and 15.40%±1.21%, respectively, which were significantly higher than those ( 100.00%±0.00%, 42.47%±0.45% and 5.40%±0.40%) of control group (P<0.05 ). But the cell proportion rate (36.37%±0.40% ) in the G1 phase in BQ group was significantly lower than that (52.13%±0.75% ) in control group (P<0.05). The expression level of p-Akt protein in BQ group was significantly higher than that in control group (P<0.05). The cell proliferation rate and the cell proportion in the S, G2 phase of LY294002 plus BQ group were 82.59%±15.00%, 42.03%±0.50% and 3.87%± 0.47%, respectively, which were significantly lower than those of BQ group (P<0.05). But the cell proportion rate (54.43%±0.40%) in the G1 phase in LY294002 plus BQ group was significantly higher than that in BQ group (P<0.05 ). Conclusion The PI3K/Akt signal pathway may play an important role in the proliferation of HL-60 cells exposed to BQ.     

天然产物3,3’-二吲哚甲烷的抗肿瘤作用及其机制研究概况

吲哚-3-甲醇(indole-3-carbinol,I3C)是一种广泛存在于十字花科芸苔属蔬菜中的植物化学物,3,3’-二吲哚甲烷(3,3’-diindolylmethane,DIM)为其主要代谢物。近年来,DIM的生物学作用,尤其是抗肿瘤作用得到了学术界的广泛关注,多项研究显示其可通过影响细胞周期、细胞生长、炎症等信号转导通路抑制恶性肿瘤生长、诱导肿瘤细胞凋亡,表现出了较强的肿瘤化学预防效应和抗肿瘤效应及在肿瘤防治方面的潜在应用价值。本文对DIM的抗肿瘤作用及其机制研究概况进行综述。     

Antigen-specific enhancement of natural human IgG antibodies to phosphatidylcholine, phosphatidylglycerol, phosphatidylinositol-4-phosphate, cholesterol, and lipid A by a liposomal vaccine containing lipid A

Natural IgG antibodies (NA) to lipids are ubiquitously distributed in sera of healthy humans and are believed to serve beneficial functions. Although NA to lipids generally exhibit germ line or near germ line binding specificities, the antibodies commonly increase transiently in the acute phases of most, if not all, infectious diseases and may serve as a first line of defense. In order to determine whether similar anti-lipid antibodies can be induced by a vaccine in humans, we examined stored sera obtained from volunteers who had previously received a candidate vaccine to Plasmodium falciparum. The vaccine had consisted of liposomes that contained both the recombinant protein antigen and also contained monophosphoryl lipid A (MPLA) as an adjuvant. All of the pre-immune sera contained NA to one or more of the liposomal lipids in the vaccine: dimyristol phosphatidylcholine (DMPC), dimyristoyl phosphatidylglycerol (DMPG), cholesterol, and MPLA. After initial immunization, followed by a boost, increased levels of IgG antibodies to all of the liposomal lipids, especially DMPG and MPLA, were observed by ELISA. Antibodies to phosphatidylinositol-4-phosphate (PIP) above the normal pre-immune NA to PIP were also observed. Although PIP was not present in the immunizing liposomes, based on the adsorption of anti-PIP antibodies by DMPG the anti-PIP antibodies were thought to represent cross-reacting anti-DMPG antibodies. The immune response was apparently antigen-specific in that NA to unrelated lipids, other than PIP, that were not present in the liposomes, galactosyl ceramide and ganglioside GM1, were not increased by the immunization. We conclude that antibodies to DMPC, DMPG, PIP, cholesterol, and MPLA can be induced in humans by immunization with liposomes containing MPLA.