A tumor-associated antigen in the scirrhous gastric carcinoma cell line MK-01 defined by monoclonal antibody S202

A monoclonal antibody (MAb) S202, with an IgG₁ isotype, that reacted strongly with the scirrhous gastric carcinoma cell line MK-01 was established. MAb S202 reacted with the colonic cancer cell line, SW116, and the pancreatic cancer cell line, PK-1, when tested by indirect immunofluorescence. The S202 reactive antigen was expressed in the majority of acetone-fixed fresh frozen cancer tissues. Eighty to 100 per cent of the paraffin-embedded sections of stomach, colon and pancreatic adenocarcinoma were positive for the S202 antigen, with diffuse cytoplasmic staining, whereas esophageal and breast cancers demonstrated markedly less immunostaining. Supplemented serum-free medium collected from 7 day old tumor cell cultures were assayed for the presence of antibody-defined antigens. Antigens detected by MAb S202 were released by the cell lines SW1116 and PK-1. The binding of MAb S202 to the colonic adenocarcinoma sections was reduced after treatment with sodium periodate which suggests that respective antigenic determinants are of carbohydrate nature without sialic acid residues.     

丝裂原活化蛋白激酶磷酸酶1与胰腺癌细胞获得性耐药的关系

目的 探讨丝裂原活化蛋白激酶（MAPK）磷酸酶1（MKP-1）在介导胰腺癌耐药细胞株SWl990／Fu产生获得性耐药过程中的可能机制。方法 采用Northern印迹杂交和Western蛋白免疫印迹杂交方法,检测MKP-1在体外诱导建立的人胰腺癌耐药细胞株SWl990／Fu、亲本细胞株SWl990和胰腺癌细胞株MiaPaCa-2中的表达,分析MKP-1在SW1990／Fu产生获得性耐药前后的变化。结果 Northern印迹杂交结果显示,在SWl990／Fu、SWl990和MiaPaCa~细胞株中均检测到2400bp的MKP-1mRNA,MKP-1在SWl990／Fu的表达水平明显低于SWl990和MiaPaCa-2。在蛋白水平上,Western蛋白免疫印迹杂交结果也表明,与SWl990和MiaPaCa4相比,MKP-1蛋白在SWl990／Fu细胞中的表达水平明显降低。结论 MAPK家族的关键调节酶MKP-1可能参与SWl990／Fu获得性耐药的产生,推测细胞信号转导系统的改变可能是导致胰腺癌细胞产生获得性耐药的机制之一。     

γ-synuclein基因真核表达载体的构建及其对结肠癌细胞SW1116体外侵袭转移潜能的影响

目的构建针对γ-synuclein基因的真核表达载体并观察其对结肠癌细胞sw1116体外侵袭及与人脐静脉内皮细胞（HUVEC）黏附能力的影响。方法从结肠癌细胞系HT29提取总RNA,经RT．PCR获得γ-synucleincDNA全长片段,经过酶切连接等反应定向克隆至真核绿色荧光蛋白表达载体pEGFP-C1上,以脂质体转染的方法将重组质粒转染至结肠癌细胞系SW1116,经G418筛选出稳定转染的细胞株。采用Transwell小室法检测细胞体外侵袭能力。将细胞接种于铺有HUVEC的96孔板中,酶标仪读取荧光强度来表示黏附细胞的相对数。结果成功构建pEGFP-γ-synuclein真核表达载体,经过筛选后可在SW1116细胞中稳定表达,且能在体外翻译出GFP-γ-synuclein融合蛋白质。转染γ-synuclein后,穿过Matrigel胶及Transwell小室膜的细胞数明显增加（198．4±20．7比98．8±13．2,P〈0．05）,与HUVEC黏附的细胞数（荧光强度）亦显著增加（3．08±0．36比1．22±0．21,P〈0．05）。结论γ-synuclein可显著增强结肠癌细胞SW1116体外侵袭转移潜能。     

皮层肌动蛋白的差异表达与结肠癌转移的相关性研究

目的 检测具有不同转移能力的结肠癌细胞亚系中皮层肌动蛋白的表达,探讨皮层肌动蛋白的差异表达与结肠癌转移的相关性.方法 本实验应用具有不同肝转移能力的结肠癌细胞系SW1116、人结肠癌皮下5代细胞系(SW1116_5)、人结肠癌肝转移细胞系1代(CRCLM1)和人结肠癌肝转移细胞系3代(CRCLM3).4种细胞在皮下成瘤后再原位种植到裸鼠结肠观察其肝脏转移能力的差异,用Western blotting和real time-PCR检测皮层肌动蛋白表达的差异,同时行体外迁移侵袭实验检测癌细胞的侵袭转移能力的差异,免疫组化方法分析临床86例结肠癌组织中皮层肌动蛋白的表达情况及其与临床病理特征之间的关系.结果 Western blotting和real time-PCR均证实在4种细胞中皮层肌动蛋白表达自SW1116、SW1116_5、CRCLM1、CRCLM3逐渐增高,四者两两比较差异有统计学意义,均P＜0.05;动物实验证实CRCLM3(100%)和CRCLM1(89%)与SW1116(40%)和SW1116_5(44%)相比具有较强的转移能力,免疫组化提示皮层肌动蛋白表达在86例中57例(66%)为强阳性,29例(34%)为阴性.结论 皮层肌动蛋白差异表达与结肠癌的转移以及临床分期呈正相关,皮层肌动蛋白有可能成为结肠癌临床分期以及肿瘤转移的判断指标.     

Natural killer cell stimulatory factor (NKSF) augments natural killer cell and antibody-dependent tumoricidal response against colon carcinoma cell lines.

The therapy of colorectal cancer may be improved by biologic response modifiers that enhance natural killer (NK) cell and antibody-dependent tumoricidal mechanisms. This study examined the effect of a recently discovered cytokine purified from the supernatant of an Ebstein-Barr virus-transformed B-lymphoblastoid cell line (RPMI-8866), natural killer cell stimulatory factor (NKSF), on NK and antibody-dependent cellular cytotoxicity (ADCC) of human colon adenocarcinoma cell lines. Human peripheral blood lymphocytes were cultured for 24 hr in the presence or absence of NKSF (3.6 pM) or interleukin-2 (1 nM). The cultured lymphocytes were analyzed for lytic potential toward chromium-51-labeled colon carcinoma targets SW 1116, 498 LI, and WC 1. ADCC was measured by incubating chromium-51-labeled SW 1116 or WC 1 targets with the monoclonal antibody CO17-1A, an IgG2a antibody reactive with gastrointestinal cancer-associated cell antigen, or control mouse IgG prior to testing NKSF-treated or control PBL effectors in a 6-hr cytotoxicity assay. NKSF significantly enhanced NK cytolysis of colon carcinoma and NK-resistant lymphoma cell lines, and on a molar basis was approximately 300 times more potent than interleukin-2 in generating NK cytotoxicity. Furthermore, NKSF significantly augmented lymphocyte-mediated ADCC against colon carcinoma targets, and the combination of NKSF with the antibody CO17-1A had an additive effect on lymphocyte tumoricidial capacity. Thus, NKSF may have a potential role in the treatment of colon cancer.     

结肠癌肝转移细胞增殖能力减弱

目的 通过阶梯转移法在裸鼠中筛选出人结肠癌肝转移细胞,然后对结肠癌肝转移细胞的生长增殖能力进行鉴定.方法 通过SW1116细胞株裸鼠皮下连续5次传代后取皮下种植瘤裸鼠结肠原位种植,分别取肝脏转移灶和皮下5代细胞进行原代培养,获得大肠癌肝转移细胞和皮下5代的原代细胞,分别命名为结直肠癌肝转移细胞1代(CHM-1)和皮下第5代(P5),通过CCK-8测生长曲线、流式检测细胞周期以及细胞周期相关的蛋白的免疫细胞化学来对SW1116、CHM-1和P5增殖能力进行检测.结果 细胞增殖实验显示CHM-1生长速度明显慢于SW1116和P5细胞(P＜0.05);流式细胞周期分析中CHM-1细胞G41期(68.390±2.865)%比例高于SW1116(50.440±1.472)%和P5(53.930±2.651)%(P＜0.05),G2期CHM-19(13.530±4.411)%比例要低于SW1116(32.030±5.645)%和P5(29.720±3.559)%(P＜0.05),S期3种细胞差异无统计学意义(18.250±6.901)%、(19.050±4.162)%、(18.930±0.169)%(P＞0.05);免疫细胞化学分析发现细胞周期蛋白Cyclin DI在CHM-1(23.7±4.7)%中的表达比SW1116(30.2±5.1)%和P5(32.1±4.2)%减少(P＜0.05).结论 发现侵袭能力和生长增殖能力具有反向关联,即结肠癌肝转移细胞具有更强的侵袭能力,但生长增殖速度比其他细胞更慢.

Abstract：

Objective To study the proliferation ability of liver metastatic colorectal cancer cells by establishing stepwise metastatic colorectal carcinoma cell model via in vivo selection.Methods SW1116 cells were transplanted into the subcutis of nude mice and serially passaged for 5 times,and then the subcutaneous tumor was implanted into the cecal wall of new nude mice.The liver metastatic lesions and the subcutaneous carcinoma cells of the fifth generation were picked for primary culture.Two cell lines named CHM-1 and P5 were obtained.Proliferation levels were analyzed by testing of cell growth curve,cell cycle analyses by flow cytometry and Cyclin D1 analysis by immunocytochemistry.Results CHM-1 grew much slower than P5 and SW 1116 although there was no difference between P5 and SW 1116 in cell proliferation assay ( P＜0.05 ).Cell cycle analysis revealed that the percentage of cells in G0/G1 phase was higher (P＜0.05) in CHM-1 (68.390 ±2.865)% than in SW1116 (50.440 ± 1.472)% and P5 (53.930 ± 2.651)%,but that in G2/M phase was lower ( P＜0.05 ) in CHM-1 ( 13.530 ± 4.411 )% than in SW1116 (32.030 ±5.645)% and P5 (29.720 ±3.559)% rough there was no difference in S phase ( 18.250 ± 6.901 )%,( 19.050 ± 4.162 )%,( 18.930 ± 0.169 )% ( P ＞ 0.05 ).The expression of cell cycle proteins Cyclin D1 was decreased ( P＜0.05 ) in CHM-1 ( 23.7 ± 4.7 )% as compared with thoseinP5(32.1±4.2)% and SW1116 (30.2 ±5.1)%.Conclusion In the same cell line,there was a reverse relationship between the ability of invasion and proliferation.     

Intraoperative immunostaining for detection of invasive cells at the resection margin of Borrmann type 4 gastric carcinoma using monoclonal antibody S202

Borrmann type 4 gastric cancer is clinically characterized by diffuse infiltration with carcinoma cells. An antiscirrhous carcinoma monoclonal antibody (MAb) S202 was used in a rapid immunostaining procedure to identify the limit of tumour invasion during surgery in samples obtained from the resection margins in 37 cases of Borrmann type 4 gastric cancer. In two instances, conventional cytological diagnosis using haematoxylin and eosin staining was negative, and in another it was inconclusive; whereas by the rapid immunostaining method single cells stained darkly, indicating malignancy. In two specimens, a positive diagnosis could be made by both methods, but immunostaining of these sections served to highlight the adenocarcinoma cells against the inflammatory background: further resection was performed. This technique enables clear recognition of the infiltrating tumour cells in the frozen sections of resected specimens. The rapid immunostaining method using MAb S202 allowed accurate and rapid determination of the limit of tumour extension at the surgical margin during surgery.     

野生型P53基因对人肠癌细胞株的抑瘤效应

为了探讨野生型P53基因对人肠癌细胞株的抑瘤效应。用电穿孔方法将正向携带有野生型P53基因cDNA全长的反转录病毒重组质粒(Dol p53)导入有P53基因突变的人肠癌SW1116细胞,通过标记基因NeoR筛选带外源P53基因的G418抗药性克隆,以观察抗药性克隆数量,同时对G418抗性细胞的生长速度及细胞增殖周期等方面进行观察,结果表明:导入WT-P53基因能使肠癌SW1116细胞的G418抗药性克隆形成减少,细胞生长速度较对照细胞明显减慢,细胞增殖周期G1期增加、S期下降。结果证明人野生型P53基因对肠癌细胞有明确的抑瘤效应,说明基于恢复P53肿瘤抑制基因功能的基因治疗在治疗结直肠癌方面有广阔应用前景。     

Expression of the cell surface antigen detected by the monoclonal antibody A7 in pancreatic carcinoma cell lines

In a previous study, we used a murine monoclonal antibody, A7, against human colon carcinoma as a drug-carrier to treat colorectal cancer.¹ In the present study, we found that MAb A7 also reacted immunohistochemically with 73% of human pancreatic carcinoma cell lines, with the A7 antigen mainly being detected on the cell surface. However, the A7 antigen was found in only 9% of the spent media of these human pancreatic carcinoma cell lines by ELISA. On the other hand, the positive incidence of CA19-9, POA, ferritin, CEA, DU-PAN-2 and SLX in those spent media was 100%, 64%, 64%, 55%, 55% and 36%, respectively. These results suggest that the A7 antigen may only rarely be shed into the sera of pancreatic cancer patients, in which case MAb A7 could be a suitable drug-carrier in targeting chemotherapy for pancreatic cancer patients.     

吉西他滨耐药人胰腺癌细胞株的建立及其与肿瘤干细胞的相关性研究

目的 建立吉西他滨耐药人胰腺癌细胞株SW1990/GZ,并探讨SW1990/GZ和胰腺癌肿瘤干细胞的相关性.方法 应用间歇浓度梯度倍增法建立吉西他滨耐药人胰腺癌细胞株SW1990/GZ;倒置显微镜下观察细胞形态;MTT法计算耐药指数(RI);荧光定量PCR检测ABCB1、ABCC1及ABCG2基因的表达水平;裸鼠皮下种植瘤试验观察SW1990和SW1990/GZ的成瘤能力;流式细胞仪通过侧群细胞(SP)法和表面特异抗原标记法(CIM4+CD24+)检测肿瘤干细胞含量.结果 在形态学上,SW1990/GZ较SW1990发生明显改变;SW1990/GZ的耐药指数是亲代SW1990的77.2倍;与亲代SW1990相比,耐药株SW1990/GZ中ABCB1、ABCC1及ABCG2的表达水平明显增高(P<0.01),裸鼠皮下成瘤能力增强(P<0.01);耐药株SW1990/GZ中SP细胞比例为(11.0±1.0)%,亲代SW1990中SP细胞比例为(4.6±0.9)%,CD44+CD24+细胞在两者中的比例分别为(8.7±0.8)%和(1.1±0.4)%(P<0.01).结论 吉西他滨耐药胰腺癌细胞株SW1990/GZ能高效富集胰腺癌肿瘤干细胞,CD44与胰腺癌获得性耐药关系密切,可能为克服胰腺癌获得性耐药提供新的治疗靶点.     

A new series of monoclonal antibodies against pancreatic cancer cells

A new series of monoclonal antibodies (Span 1-7) was produced by immunizing mice with SW 1990 human pancreatic cancer cells. Span 1-4 antibodies (Ab) reacted with 4-5 of 8 pancreatic cancer cell lines tested and with 5-6 of 9 colon cancer cell lines and some lung cancer cell lines. Span 1-4 antigens (Ag) were detected not only on cell surface but also in cultured spent medium of SW 1990 cells by ELISA. They were also found in the fractions of a cesium chloride gradient of SW 1990 xenograft homogenates which have the highest molecular weight, density and carbohydrate content. Their immunoreactivity is dependent upon sialic acid because prior digestion with neuraminidase abolished their immunoreactivity. Span 5,6,7 Ab reacted with only 3 of 8 pancreatic cancer cell lines tested and did not reacted with any other cell lines such as colon cancer, lung cancer and melanoma. The epitopes which were recognized by Span 5,6,7 Ab did not contain sialic acid. These results suggest that Span 1-4 Ab has potential application in the detection of gastrointestinal cancers and that Span 5,7 may be useful to detect the origin which is unknown by using immunohistochemistry method for metastatic lesions.     

胰腺癌阿霉素耐药细胞株SW1990/ADM的建立及其耐药机理研究

目的　建立人胰腺癌阿霉素 (ADM )耐药细胞株SW 1990 /ADM ,探讨其耐药机理。方法　采用ADM体外浓度梯度倍增法诱导培养人胰腺癌细胞株SW 1990 10个月 ,获得耐药细胞株SW 1990 /ADM ,脱药培养 2个月后检测其生物学性状、药物敏感性及多药耐药基因mdr1的功能及表达情况。结果　与亲本细胞株SW 1990相比 ,SW1990 /ADM在形态学上发生了一系列变化 ;对包括ADM在内的多种化疗药物均表现出一定的耐药性 ,其对ADM、丝裂霉素、氟尿嘧啶和健择的耐药指数分别达到 4 9.6 0、7.2 5、3.80和 1.2 5 ;其mdr1mRNA的表达亦明显高于亲本细胞株SW 1990 (P<0 .0 1)。结论　体外浓度梯度倍增法可建立稳定传代的人胰腺癌耐药细胞株SW1990 /ADM。其耐药性与mdr1的表达呈正相关。     

TXNDC9在结肠直肠癌组织中的表达及其影响

目的:探讨TXNDC9基因在结肠直肠癌组织和细胞中的表达,以及沉默TXNDC9高表达后对细胞株SW1116增殖、迁移、侵袭能力的影响。方法:分别应用免疫组织化学技术、免疫印迹法观察TXNDC9在结肠直肠癌组织和细胞中的表达水平:应用小干扰RNA瞬时转染TXNDC9高表达的结肠癌细胞株SW1116,用实时PCR筛选最高效率的干扰片段,并用Western印迹法检测基因沉默效果:最后研究瞬时转染后SW1116细胞增殖、迁移、侵袭能力的变化。结果:结肠直肠癌组织中TXNDC9的表达明显高于对照的癌旁正常组织(P<0.01),细胞迁移和侵袭能力亦有明显下降(P<0.01)。结论:TXNDC9在结肠直肠癌组织中的表达显著高于癌旁正常黏膜上皮,并与肿瘤的大小和浸润深度相关,SW1116是TXNDC9基因高表达的细胞株之一,下调TXNDC9表达能显著抑制该细胞的增殖能力、细胞迁移和侵袭能力。TXNDC9基因对维持肿瘤细胞的增殖和运动能力有重要作用,并可能成为抑制肿瘤生长和转移的有效途径。     

体内连续筛选法建立人结肠癌肝转移阶梯细胞模型

目的：通过在裸鼠体内进行SW1116结肠癌细胞株原位种植肝转移连续筛选,建立人结肠癌肝转移阶梯细胞模型系统,为研究结肠癌转移的分子机制提供实验模型。方法：将SW1116细胞株在裸鼠皮下连续5次传代后,取皮下种植瘤在裸鼠结肠进行原位种植,继而取肝脏转移灶进行下一代裸鼠结肠原位种植,经3次结肠原位种植肝转移筛选,建立大肠癌肝转移阶梯细胞模型。用免疫组化法验证种植瘤及转移灶的组织来源,并行同期体内外侵袭实验,检测经体内连续筛选出的癌细胞侵袭转移能力变化。结果：经5代皮下连续传代及3代结肠至肝的体内转移筛选,成功建立了第三代结肠癌肝转移筛选细胞系（CRCLM3）。裸鼠种植瘤及转移灶均表达人癌胚抗原,而同期体内外侵袭试验结果显示,经体内筛选得到的结肠癌细胞株转移能力逐渐加强。结论：经体内连续肝转移筛选所建立的结肠癌细胞系侵袭转移能力增强,而CRCLM3细胞系是研究结肠癌肝转移机制的理想细胞模型。     

胰腺癌相关免疫原性膜抗原的筛查和鉴定

目的 应用蛋白质组学技术筛查、鉴定胰腺癌相关免疫原性膜抗原.方法 培养、提取并纯化胰腺癌细胞株SW1990的膜蛋白,将膜蛋白通过双向凝胶电泳(2-DE)进行分离,平行的3块2-DE凝胶分别行考马斯亮蓝染色和免疫印迹杂交.收集并纯化临床上66例胰腺癌和24例慢性胰腺炎患者血清中的IgG,分别与膜蛋白2-DE平行凝胶进行免疫印迹杂交.应用基质辅助激光解吸离子化飞行时间质谱分析杂交阳性蛋白位点,并经肽指纹库鉴定.应用RT-PCR、实时荧光定量PCR(real-time PCR)、Western blot方法对筛查出的膜抗原进行验证,并比较不同胰腺癌细胞株、正常胰腺组织中目的 膜抗原的基因及蛋白表达水平的差异.结果 胰腺癌细胞株SW1990膜蛋白与胰腺癌患者血清IgG免疫印迹杂交共出现9个阳性点,与同慢性胰腺炎IgG杂交所出现的2个阳性点无重复,经质谱分析鉴定出电压依赖性离子通道(VDAC)2可能是有潜力的候选膜抗原.经RT-PCR和real-time PCR验证,VDAC2基因在胰腺癌细胞株SW1990、AsPc、P3中均有表达.Western blot实验结果表明,VDAC2在胰腺癌细胞株中的蛋白表达明显高于正常胰腺组织.结论 胰腺癌细胞膜蛋白VDAC2可能是具有免疫原性的胰腺癌相关膜抗原,其基因在胰腺癌细胞株SW1990、AsPc、P3中均有表达,并且在胰腺癌细胞株中的蛋白表达水平明显高于正常胰腺组织.     

胰腺癌相关免疫原性膜抗原的筛查和鉴定

目的 应用蛋白质组学技术筛查、鉴定胰腺癌相关免疫原性膜抗原.方法 培养、提取并纯化胰腺癌细胞株SW1990的膜蛋白,将膜蛋白通过双向凝胶电泳(2-DE)进行分离,平行的3块2-DE凝胶分别行考马斯亮蓝染色和免疫印迹杂交.收集并纯化临床上66例胰腺癌和24例慢性胰腺炎患者血清中的IgG,分别与膜蛋白2-DE平行凝胶进行免疫印迹杂交.应用基质辅助激光解吸离子化飞行时间质谱分析杂交阳性蛋白位点,并经肽指纹库鉴定.应用RT-PCR、实时荧光定量PCR(real-time PCR)、Western blot方法对筛查出的膜抗原进行验证,并比较不同胰腺癌细胞株、正常胰腺组织中目的 膜抗原的基因及蛋白表达水平的差异.结果 胰腺癌细胞株SW1990膜蛋白与胰腺癌患者血清IgG免疫印迹杂交共出现9个阳性点,与同慢性胰腺炎IgG杂交所出现的2个阳性点无重复,经质谱分析鉴定出电压依赖性离子通道(VDAC)2可能是有潜力的候选膜抗原.经RT-PCR和real-time PCR验证,VDAC2基因在胰腺癌细胞株SW1990、AsPc、P3中均有表达.Western blot实验结果表明,VDAC2在胰腺癌细胞株中的蛋白表达明显高于正常胰腺组织.结论 胰腺癌细胞膜蛋白VDAC2可能是具有免疫原性的胰腺癌相关膜抗原,其基因在胰腺癌细胞株SW1990、AsPc、P3中均有表达,并且在胰腺癌细胞株中的蛋白表达水平明显高于正常胰腺组织.     

胰腺癌相关免疫原性膜抗原的筛查和鉴定

目的 应用蛋白质组学技术筛查、鉴定胰腺癌相关免疫原性膜抗原.方法 培养、提取并纯化胰腺癌细胞株SW1990的膜蛋白,将膜蛋白通过双向凝胶电泳(2-DE)进行分离,平行的3块2-DE凝胶分别行考马斯亮蓝染色和免疫印迹杂交.收集并纯化临床上66例胰腺癌和24例慢性胰腺炎患者血清中的IgG,分别与膜蛋白2-DE平行凝胶进行免疫印迹杂交.应用基质辅助激光解吸离子化飞行时间质谱分析杂交阳性蛋白位点,并经肽指纹库鉴定.应用RT-PCR、实时荧光定量PCR(real-time PCR)、Western blot方法对筛查出的膜抗原进行验证,并比较不同胰腺癌细胞株、正常胰腺组织中目的 膜抗原的基因及蛋白表达水平的差异.结果 胰腺癌细胞株SW1990膜蛋白与胰腺癌患者血清IgG免疫印迹杂交共出现9个阳性点,与同慢性胰腺炎IgG杂交所出现的2个阳性点无重复,经质谱分析鉴定出电压依赖性离子通道(VDAC)2可能是有潜力的候选膜抗原.经RT-PCR和real-time PCR验证,VDAC2基因在胰腺癌细胞株SW1990、AsPc、P3中均有表达.Western blot实验结果表明,VDAC2在胰腺癌细胞株中的蛋白表达明显高于正常胰腺组织.结论 胰腺癌细胞膜蛋白VDAC2可能是具有免疫原性的胰腺癌相关膜抗原,其基因在胰腺癌细胞株SW1990、AsPc、P3中均有表达,并且在胰腺癌细胞株中的蛋白表达水平明显高于正常胰腺组织.     

胰腺癌相关免疫原性膜抗原的筛查和鉴定

目的 应用蛋白质组学技术筛查、鉴定胰腺癌相关免疫原性膜抗原.方法 培养、提取并纯化胰腺癌细胞株SW1990的膜蛋白,将膜蛋白通过双向凝胶电泳(2-DE)进行分离,平行的3块2-DE凝胶分别行考马斯亮蓝染色和免疫印迹杂交.收集并纯化临床上66例胰腺癌和24例慢性胰腺炎患者血清中的IgG,分别与膜蛋白2-DE平行凝胶进行免疫印迹杂交.应用基质辅助激光解吸离子化飞行时间质谱分析杂交阳性蛋白位点,并经肽指纹库鉴定.应用RT-PCR、实时荧光定量PCR(real-time PCR)、Western blot方法对筛查出的膜抗原进行验证,并比较不同胰腺癌细胞株、正常胰腺组织中目的 膜抗原的基因及蛋白表达水平的差异.结果 胰腺癌细胞株SW1990膜蛋白与胰腺癌患者血清IgG免疫印迹杂交共出现9个阳性点,与同慢性胰腺炎IgG杂交所出现的2个阳性点无重复,经质谱分析鉴定出电压依赖性离子通道(VDAC)2可能是有潜力的候选膜抗原.经RT-PCR和real-time PCR验证,VDAC2基因在胰腺癌细胞株SW1990、AsPc、P3中均有表达.Western blot实验结果表明,VDAC2在胰腺癌细胞株中的蛋白表达明显高于正常胰腺组织.结论 胰腺癌细胞膜蛋白VDAC2可能是具有免疫原性的胰腺癌相关膜抗原,其基因在胰腺癌细胞株SW1990、AsPc、P3中均有表达,并且在胰腺癌细胞株中的蛋白表达水平明显高于正常胰腺组织.     

胰腺癌相关免疫原性膜抗原的筛查和鉴定

目的 应用蛋白质组学技术筛查、鉴定胰腺癌相关免疫原性膜抗原.方法 培养、提取并纯化胰腺癌细胞株SW1990的膜蛋白,将膜蛋白通过双向凝胶电泳(2-DE)进行分离,平行的3块2-DE凝胶分别行考马斯亮蓝染色和免疫印迹杂交.收集并纯化临床上66例胰腺癌和24例慢性胰腺炎患者血清中的IgG,分别与膜蛋白2-DE平行凝胶进行免疫印迹杂交.应用基质辅助激光解吸离子化飞行时间质谱分析杂交阳性蛋白位点,并经肽指纹库鉴定.应用RT-PCR、实时荧光定量PCR(real-time PCR)、Western blot方法对筛查出的膜抗原进行验证,并比较不同胰腺癌细胞株、正常胰腺组织中目的 膜抗原的基因及蛋白表达水平的差异.结果 胰腺癌细胞株SW1990膜蛋白与胰腺癌患者血清IgG免疫印迹杂交共出现9个阳性点,与同慢性胰腺炎IgG杂交所出现的2个阳性点无重复,经质谱分析鉴定出电压依赖性离子通道(VDAC)2可能是有潜力的候选膜抗原.经RT-PCR和real-time PCR验证,VDAC2基因在胰腺癌细胞株SW1990、AsPc、P3中均有表达.Western blot实验结果表明,VDAC2在胰腺癌细胞株中的蛋白表达明显高于正常胰腺组织.结论 胰腺癌细胞膜蛋白VDAC2可能是具有免疫原性的胰腺癌相关膜抗原,其基因在胰腺癌细胞株SW1990、AsPc、P3中均有表达,并且在胰腺癌细胞株中的蛋白表达水平明显高于正常胰腺组织.