p27kip1腺病毒重组体对人食管癌裸鼠移植瘤生长的抑制作用

D27kip1是新近发现的一种抑癌基因，研究表明p27kip1基因转移能显著抑制食管癌和胃癌细胞生长，该基因疗法在体内实验中是否同样有效值得进一步研究。目的：研究p27kip1腺病毒重组体对人食管癌裸鼠移植瘤生长的抑制作用。方法：将携带人p27kip1基因的重组腺病毒载体导人人食管癌裸鼠移植瘤中．测定肿瘤生长抑制率．免疫组化方法检测移植瘤中p27kip1和生存素(survivin)的表达。结果：经p27kip1基因治疗的裸鼠，肿瘤生长抑制率达64．1％，移植瘤中p27kip1呈高表达．生存素呈低表达。结论：p27kip1腺病毒重组体能显著抑制人食管癌裸鼠移植瘤的生长．上调p27kin1和下调生存素的表达可能是其雷要作用机制。     

白藜芦醇诱导胃癌细胞凋亡的分子机制

白藜芦醇是从多种葡萄属植物中提取的多酚类化合物[1] 。近年来发现白藜芦醇具有抗癌作用[2 ,3 ] 。通过透射电镜和ＴＵＮＥＬ法 ,在体外定性、定量地研究白藜芦醇与胃癌细胞凋亡的关系 ;通过免疫组化法和ＲＴ ＰＣＲ检测凋亡相关基因ｂｃｌ 2和ｂａｘ的表达 ,研究白藜芦醇诱导胃癌细胞凋亡发生的可能机制。　　一、材料与方法1.细胞系 :胃癌细胞株ＳＧＣ 790 1,由山东省立医院中心实验室传代培养。2 .白藜芦醇对胃癌细胞的生长抑制率测定 :将细胞以10 5/ｍｌ浓度接种于 96孔板 ,每孔 10 0 μｌ,2 4ｈ后分别加入不同浓度的白藜芦醇 ,分别培…     

p27蛋白表达与结肠癌细胞增殖和凋亡的关系

以 2 9例结肠癌标本为研究对象 ,同时以 18例正常结肠及 30例溃疡性结肠炎标本为对照。用免疫组化 (ＳＡＢＣ)法检测其增殖细胞核抗原 (ＰＣＮＡ)、ｐ2 7蛋白的表达 ,用ＤＮＡ片段末端标记 (ＴＵＮＥＬ)法检测其凋亡 ,探讨 ｐ2 7蛋白这一细胞增殖负调控因子在结肠癌生长机制中的意义[1] 。材料与方法一、标本标本选自我院病理科 (1996年 1月～ 1999年 1月 )石蜡存档标本。 2 9例结肠癌均为手术标本 ,其中男 14例 ,女 15例 ,年龄为 35～ 81岁 ,平均 6 1.5岁。 30例溃疡性结肠炎均为结肠镜检标本 ,其中男 14例 ,女 16例 ,年龄为 18～ 6 8岁 ,…     

NDGA诱导胃癌细胞凋亡的分子机制的研究

目的 探讨NDGA诱导胃癌细胞凋亡的分子机制。方法 分光光度法检测caspase-3的细胞活性,同时用Western blot分析caspase-3及其底物PARP。用Western blot分析P53、caspase-3、PARP、P21^wafl、P27^kipl、Bcl-2和Bax的浓度,免疫法检测细胞色素C。结果 NDGA通过活化caspase-3诱导细胞凋亡,caspase-3的活化是由于细胞色素C从线粒体释放入细胞质而引起的。NDGA处理也可导致P27^kipl、Bax蛋白水平升高,同时伴有细胞积聚于G1期。z-DEVD-fmk,一种caspase-3抑制剂,可逆转caspase-3的活化及其引起的凋亡。结论 NDGA诱导的细胞凋亡是通过上调P27^kipl、Bak的水平,释放细胞色素C,最终活化caspase-3而引起的。     

p27与胃粘膜上皮细胞周期调控的研究进展

p27基因是近年发现的一种抑癌基因,p27蛋白是广谱的细胞周期蛋白依赖激酶抑制剂,在细胞增殖、凋亡、肿瘤发生发展过程中具有重要调节作用,本文对p27基因和蛋白与胃粘膜上皮细胞周期调控的关系作一综述。     

热休克蛋白27抗细胞凋亡的分子机制

热休克蛋白(heat shock proteins，HSPs)是存在于细胞内的一种主要分子伴侣，在生理和应激条件下均能表达。它们是在结构上拥有高度保守晶体蛋白序列的一组多肽，按分子量可以分为HSP100、HSP90、HsP70、HSP60和分子量为20000～30000的小分子量HSPs(small HSPs，sHSPs)、泛肽等几个亚家族。HSP25／27(啮齿动物25000，     

重组人p53腺病毒感染对携带不同p53状态胃癌细胞增殖和凋亡的影响

目的研究重组人p53腺病毒感染不同p53状态胃癌细胞对其p53蛋白表达、生长抑制率、细胞周期与凋亡率的影响。方法不同浓度重组人p53腺病毒感染3种不同p53状态胃癌细胞,即含野生型p53基因的细胞(wild-type)、含突变型p53基因的细胞(mutant-type)、含空载质粒即p53基因缺失的细胞(vector-cell)。48 h后,用Western blotting法检测p53蛋白在3种胃癌细胞中的表达;用MTT法测定重组人p53腺病毒感染3种胃癌细胞的生长抑制率,用流式细胞仪检测细胞周期分布和凋亡率。结果rAd-p53感染3种胃癌细胞48 h后p53蛋白表达阳性,对照组p53基因缺失的胃癌细胞无表达,对照组含野生型p53基因的细胞和含突变型p53基因的细胞弱表达。rAd-p53对3种胃癌细胞的生长抑制效应在一定的浓度范围内呈剂量依赖性,而与细胞内在的p53状态无关。含野生型p53基因的细胞、含突变型p53基因的细胞和p53基因缺失的细胞感染rAd-p53后诱导G2/M期阻滞与细胞凋亡率分别增加2.5、3.6、3.2倍。结论腺病毒介导p53基因感染3种不同p53状态胃癌细胞改变细胞内在的p53状态,p53蛋白表达、生长抑制率、细胞周期分布、凋亡率均与细胞内在的p53状态无关。     

肝癌组织中p27蛋白表达与肿瘤增殖凋亡活性的研究

研究肝细胞癌组织中p27表达对细胞增殖与凋亡活性的影响.采用Elivision法检测47例肝癌及相应癌旁肝组织中p27及PCNA的表达,TUNEL法检测原位细胞凋亡.结果显示肝癌组织中细胞增殖与凋亡指数明显高于癌旁肝组织.肝癌组织中p27染色指数明显低于癌旁肝组织与正常肝组织.低分化肝癌组织中p27表达和凋亡指数均明显降低.存在肝外转移的肝癌组织中p27表达降低而增殖指数明显增高.进一步研究显示,p27高表达组肝癌组织中凋亡指数明显高于低表达组,而增殖指数却显著降低.提示p27蛋白表达降低与肝癌的发生和进展有着密切关系,并可能是导致肝癌细胞增殖凋亡失衡的因素之一.     

Apoptosis mechanisms of human gastric cancer cell line MKN-45 infected with human mutant p27

AIM: To explore the inducing effect of human mutant p27 gene on the apoptosis of the human gastric cancer cell line MKN-45 and its associated mechanisms. METHODS: The recombinant adenovirus Ad-p27mt was constructed to infect the human gastric cancer cell line MKN-45. Using flow cytometry, TUNEL assay and DNA fragment analysis, we measured the apoptotic effect of Ad-p27mt on the human gastric cancer cells. RESULTS: Ad-p27mt was successfully constructed and the infection efficiency reached 100%. After 18 h of infection, we observed an apoptotic hypodiploid peak on the flow cytometer before G1-S and apoptotic characteristic bands in the DNA electrophoresis. The apoptotic rate detected by TUNEL method was significantly higher in the Ad-p27mt group (89.4±3.12%) compared to the control group (3.12±0.13%, P < 0.01). CONCLUSION: Human mutant p27 can induce apoptosis of the human gastric cancer cells in vitro.     

Impact of p27mt gene on transplantation model of human colorectal cancer in nude mice

AIM： To investigate the inhibitory and anti-metastatic effect of mutant p27 gene （p27mt） on the growth of colorectal cancer xenografts in nude mice and its underlying mechanism. METHODS： Inhibitory effect of p27mt gene on the growth of colorectal cancer xenografts was determined by measurement of tumor size before and after direct intra-tumoral injection of Ad-p27mt in a pre-established transplantation model of human colorectal cancer in nude mice. Cell cycle and apoptosis were detected by flow cytometry performed on single-cell suspension from an isolated tumor. Expression of MMP-9 in tumor tissue was detected by immunohistochemistry. RESULTS： The average sizes of transplantation tumors were 1.94 ± 0.67 cm^3, 2.75 ± 0.83 cm^3 and 3.01 ± 0.76 cm^3 in the Ad-p27mt, Ad-LacZ and control groups, respectively （P 〈 0.05）. The average proliferation rates were 37.34% ± 1.45%, 53.16% ± 3.27% and 54.48% ± 2.43%, in the Ad-p27mt, Ad-LacZ and control groups, respectively （P 〈 0.05）. The average apoptosis rates were 19.79% ± 3.32%, 6.38% ± 4.91% and 7.25% ± 5.20% in the Ad-p27mt, Ad-LacZ and control groups, respectively （P 〈 0.01）. The average MMP-9 expression rates were 20%, 75% and 66.7% in the Ad-p27mt, Ad-LacZ and control groups, respectively （P 〈 0.01）. CONCLUSION： p27mt inhibits the growth of transplanted tumor by blocking the proliferation of cancer xenografts and by promoting apoptosis of transplantated tumor cells, as well as decrease transplanted tumor metastasis.     

Effect of p27mt gene on apoptosis of the colorectal cancer cell line Lovo

AIM： To construct p27mt recombinant adenovirus, transfect the colorectal cell line Lovo and observe the effects of p27mt on Lovo cell apoptosis and cell cycle inhibition. METHODS： We constructed recombinant adenovirus containing p27mt by homologous recombination in bacteria. The colorectal cancer cell line Lovo was infected with recombinant replication-defective adenovirus Ad- p27mt, and expression of p27mt was determined by Western blotting; the inhibitory effect of p27mt on Lovo cells was detected by cytometry. Cell cycle was determined by flow cytometry. DNA fragment analysis identified the occurrence of apoptosis. RESULTS： The recombinant adenovirus which already contained p27mt target gene was successfully constructed. When multiplicity of infection was ≥50, the infection efficiency was 100%. After transfection of Lovo cells with Ad-p27mt the cells had high p27 expression which was identified by immunoblotting assay. PI staining and flow cytometry showed that 77.96% of colorectal cancer cells were inhibited in phase G0/G1, while in the Ad-LacZ group and blank control group, 27.57% and 25.29% cells were inhibited in the same phase, respectively. DNA fragment analysis, flow cytometry and TUNEL assay demonstrated that p27mt is able to induce apoptosis in colorectal cancer cells. CONCLUSION： p27mt has an obvious blocking effect on colorectal cancer cell cycle, and most cells were inhibited in phase G0/G1. Therefore, p27mt can induce apoptosis in colorectal cells.     

多希紫杉醇温敏纳米胶束对人胃癌裸鼠移植瘤的靶向治疗作用

目的:探讨多希紫杉醇温敏纳米胶束治疗人胃癌裸鼠移植瘤的疗效.方法:采用裸鼠BGC-823胃腺癌动物模型,每组6只,随机分配至设立的多希紫杉醇非热疗和热疗组,多希紫杉醇温敏纳米胶束非热疗和热疗组以及生理盐水对照组等共8组,采用尾静脉给药方式,并恒温43℃对热疗组肿瘤部位进行热导向化疗,动态观察并测定肿瘤的体积、瘤质量抑瘤率,评价治疗效果,并观察实验期间动物的全身情况及相对体质量变化,评价毒副作用.结果:多希紫杉醇温敏纳米胶束热疗组人胃癌移植瘤表现出明显抑制,体积和瘤质量抑瘤率分别为81.5%和85.4%,显著高于多希紫杉醇温敏纳米胶束非靶向组(32.2%,37.5%)和多希紫杉醇注射液组(49.2%,58.0%)(P<0.05),且多希紫杉醇温敏纳米胶束热疗组的小鼠体质量与其他各组比较相对平稳,且饮食、活动正常,对正常组织的毒副作用明显减轻.结论:温敏纳米胶束具有良好的高效低毒体内抗肿瘤作用,作为一种新型的药物载体显示了良好的应用前景.     

Antitumor bioactivity of adenovirus-mediated p27mt in colorectal cancer cell line SW480

AIM： To explore the antitumor bioactivity of adenovirusmediated mutant type p27^kip1 gene in a colorectal cancer cell line SW480. METHODS： We constructed recombinant adenovirus vector expressing a mutant type p27^kip1 gene （ad- p27mt）, with mutation of Thr-187/Pro-188 （ACGCCC） to Met-187/Ile-188 （ATGATC）, and transduced into SW480 cells. Then we detected expression of p27, Bcl-2 and Bax protein in the transductants by Western blotting, cell cycle of transductants by a digital flow cytometric system, migrating potential with Boyden Chamber and SW480 tumor cell growth inhibition in vitro and in vivo. RESULTS： We found that a recombinant adenovirus vector of expressing ad-p27mt, with mutation of Thr-187/Pro-188 （ACGCCC） to Met-187/Ile-188 （ATGATC） has potent inhibition of SW480 tumor cell growth in vitro and in vivo. Furthermore, ad-p27mt induced cell apoptosis via regulating bax and bcl-2 expressions, and G1/S arrest in SW480 cells and inhibited cell migration. CONCLUSION： ad-p27mt has a strong anti-tumor bioactivity and has the potential to develop into new therapeutic agents for colorectal cancer.     

Effect of p27(KIP1) on cell cycle and apoptosis in gastric cancer cells

AIM: To elucidate the effect of p27KIP1 on cell cycle and apoptosis regulation in gastric carcinoma cells. METHODS: The whole length of p27KIP1 cDNA was transfected into human gastric cancer cell line SCG7901 by lipofectamine. Expression of p27KIP1 protein or mRNA was analyzed by Western blot and RNA dot blotting, respectively. Effect of p27KIP1 on cell growth was observed by MTT assay and anchorage-independent growth in soft agar. Tumorigenicity in nude mice was used to assess the in vivo biological effect of p27KIP1. Flow cytometry, TUNEL, and electron microscopy were used to assess the effect of p27KIP1 on cell cycle and apoptosis. RESULTS: Expression of p27KIP1 protein or mRNA increased evidently in SCG7901 cells transfected with p27KIP1. The cell growth was reduced by 31% at 48 h after induction with zinc determined by cell viability assay. The alteration of cell malignant phenotype was evidently indicated by the loss of anchorage-independent growth ability in soft agar. The tumorigenicity in nude mice was reduced evidently (0.55±0.14 cm vs 1.36±0.13 cm, P<0.01). p27KIP1 overexpression caused cell arrest with 36% increase (from 33.7% to 69.3%, P<0.01) in G1 population. Prolonged p27KIP1 expression induced apoptotic cell death reflected by pre-G1 peak in the histogram of FACS, which was also confirmed by TUNEL assay and electron microscopy. CONCLUSION: p27KIP1 can prolong cell cycle in G1 phase and lead to apoptosis. p27KIP1 may be a good candidate for cancer gene therapy.     

血管生成抑制剂对胃癌生长抑制作用的实验研究

目的研究新的血管生成抑制剂2(8羟基6甲氧基1氧1氢2苯并吡喃3烃基)丙酸(NM3)对胃癌生长的抑制作用,并探讨其对胃癌细胞凋亡的影响。方法建立人胃腺癌裸鼠皮下异体移植模型。移植1周后开始腹腔注射NM3,隔天1次,剂量为10、20、40mg/kg,分别3d1次联合卡铂5mg/kg,并与生理盐水对照组、NM3或卡铂单独治疗组比较(NM3用5周,卡铂4周)。种植后第7周处死动物,测量肿瘤大小,计算抑瘤率,流式细胞术(FCM)法分析肿瘤细胞凋亡指数(AI)。结果单用NM3剂量分别为10、20及40mg/kg时,肿瘤的平均重量分别为(1351.0±116.9)、(1041.1±143.5)及(767.5±140.1)mg,明显小于生理盐水对照组[(1754.0±144.2)mg,P<0.05]。单用卡铂组的抑瘤率为5.6%,对胃癌无明显抑制作用。单用NM3剂量为10、20及40mg/kg时,抑瘤率分别为23.0%、40.6%及56.2%。三组剂量分别联合卡铂治疗时抑瘤率为42.9%、47.6%及63.2%,与对照组比较差异有统计学意义(P<0.05)。NM3三种剂量组联合卡铂治疗的AI分别是(6.96±0.65)%、(10.65±1.43)%及(21.66±2.96)%,对照组为(1.37±0.19)%,卡铂组为(1.85±0.22)%。结论NM3能诱导胃癌细胞凋亡,对体内胃癌的生长有抑制作用,能加强卡铂对胃癌的化疗疗效。     

Tumorigenicity,invasion, and metastasis of human gastric cancer in nude mice

Summary Tumors derived from 105 patients with gastric cancer were subcutaneously heterotransplanted into nude mice in order to study their tumorigenicity and malignant behavior. Of the 105 gastric cancers, 45 were successfully transplanted (a 42.9% tumorigenesis rate). The tumorigenesis rate of Borrmann type 1 and 2 cancers (77.8%) was significantly higher than that of type 3 and 4 cancers (34.6%). Also, the tumorigenesis rate of differentiated carcinoma (57.1 %) was significantly higher than that of undifferentiated carcinoma (30.9%). Spontaneous metastases from the subcutaneous tumors were observed in 5 of the 37 established tumor lines (13.5%), and macroscopic pulmonary metastases were common with one tumor line (SCK-29). Although most of the subcutaneous gastric cancers showed local expansion without distant metastasis, the same tumor cells implanted into the peritoneal cavity exhibited invasive growth and/or metastasis. Thus, the expression of a metastatic pheno-type by human gastric cancer was influenced by the host microenvironment. The SCK-29 tumor line with its high metastatic potential may be useful for studies on the mechanism of blood-borne metastasis.Abbreviations pap papillary adenocarcinoma - tub₁ well-differentiated adenocarcinoma - tub₂ moderately differentiated adenocarcinoma - por poorly differentiated adenocarcinoma - sig signet-ring cell adenocarcinoma - muc mucinus adenocarcinoma - giant giant cell adenocarcinoma - ud undifferentiated adenocarcinoma - ade ascitic adenocarcinoma This study was supported in part by a grant-in aid for cancer research (B.no. 63480309) from the Ministry of Education, Science and Culture, Japan     

顺铂结合CIK细胞对裸鼠人胃癌模型体内的抗肿瘤作用

目的:探讨顺铂、CIK细胞以及顺铂联合CIK对裸鼠人胃癌移植瘤生长的抑制作用,为临床上联合应用顺铂和CIK细胞治疗胃癌提供实验依据.方法:应用淋巴细胞分离液分离外周血单个核细胞,给予多种细胞因子(rhIFN-g、CD3mcAb、rh1L-1、rhlL-2),诱导生成CIK细胞;培养人胃癌细胞株SGC-7901,接种至80只裸鼠右腋皮下,10 d后取移植瘤直径基本一致的裸鼠随机分4组:NS对照组、顺铂组、CIK细胞组和顺铂+CIK细胞组,每组16只.连续5 d在接种肿瘤细胞部位处给予相应注射治疗,观察其对胃癌移植瘤模型的抗肿瘤疗效.结果:与NS对照组相比,顺铂组、CIK细胞组、顺铂+CIK细胞组裸鼠人胃癌移植瘤模型治疗后肿块质量均减轻,生存期均明显延长,尤以顺铂+CIK组效果显著(P<0.01).裸鼠体内实验表明,顺铂+CIK细胞联合应用能够显著抑制胃癌细胞的生长,其抑瘤率可达57.8%,明显高于NS对照组(P<0.01).免疫功能检测显示红细胞C3b反应受体明显升高,红细胞免疫复合物受体明显降低(P<0.01).结论:顺铂联合CIK细胞对人胃癌移植瘤生长的抑制作用大于单独应用顺铂或CIK细胞.     

热休克蛋白27/60在胃癌中的表达及意义

目的研究热休克蛋白27和60(HSP27/60)在胃癌组织中的表达及与胃癌生物学行为关系。方法采用免疫组化SABC法检测48例胃癌组织中热休克蛋白27和60的蛋白表达。结果胃癌组织中HSP27和HSP60蛋白表达阳性率分别为64.6%、81.3%;HSP27在胃癌中表达与肿瘤有无远处转移、淋巴结转移个数及浸润深度有关;HSP60表达与肿瘤细胞分化程度及Ki-67增殖指数有关;HSP27/60的表达存在相关性。结论 HSP27/60表达与胃癌生物学行为有相关性,在胃癌的发生、发展过程中发挥着重要的作用。