Summary： The specific anti-tumor immune response induced by mouse bone marrow dendritic cells （DCs） lransfected with recombinant adenovirus carrying mutant k-ras genes was investighted. DCs were generated from mous...Summary： The specific anti-tumor immune response induced by mouse bone marrow dendritic cells （DCs） lransfected with recombinant adenovirus carrying mutant k-ras genes was investighted. DCs were generated from mouse bone marrow in the presence of rmGM-CSF （3.3 ng/mL） and rmIL-4 （1.3 ng/mL） and detected by FACS, and then transfecled with the recombinant adenovirus encoding mutant k ras gene. The efficacy of transfection and T cell stimulating activity of DCs were detected. CTL activity of the mice vaccinated with DCs was observed. The resuhs showed thai DCs had dendritic veiled morphology. BmDCs highly expressed B7-1（80%）, B7-2（77%）, MHC Ⅱ （70%）, CDllc （65%）, CD40 （70%） and CD54 （96%） with FACS, and no significant difference in the expression was observed before and after the transfection （P〈0.05）. The DCs transfeeled by mutant k-ras gene could significantly stimulate lymphoeytes proliferation as compared with those transfeeted by Ad e or non-modified DCs （P〈0.05）. DC vaccine transfected by mutant k-ras gene could induce CTL activity against Lewis lung cancer, but not against B16. The specific eytotoxicity against Lewis lung cancer in Ad-k-ras/12-transdueed DC group was signifieantly higher than those in the control, vector and non transfeeted DCs groups （P〈0.05）. It was concluded that special antitumor response could be induced by DCs transfected with recombinant adenovirus carrying mutant k-ras genes.展开更多
To evaluate the feasibility and clinical significance of the PCR SSP technique in detecting K ras gene mutation at codon 12 in pancreatic adenocarcinoma tissues. 80 specimens of surgical resection or biopsy samples ...To evaluate the feasibility and clinical significance of the PCR SSP technique in detecting K ras gene mutation at codon 12 in pancreatic adenocarcinoma tissues. 80 specimens of surgical resection or biopsy samples were tested at our hospital from January 1994 to September 1995. Three different special sequence primers (SSP) synthesized according to mutation styles of CGT, GTT, GAT were respectively prepared. Three amplification reactions were performed for each sample. The amplification products were analyzed by conventional polyacrylamide gel electrophoresis, stained with ethidium bromide and observed under UV transillumination. Results: All of the 34 pancreatic adenocarcinoma samples had positive PCR results with the mutation rate 100%. 7 cases were CGT mutation, 18 GGT and 17 GAT mutation, in which 2 types of mutation existed in 8 cases. No mutation appeared in 13 normal pancreatic tissues, 6 insulinomas, 6 chronic pancreatitis, 5 benign pancreatic cysts, 7 bile duct carcinoma, 5 ampulla carcinoma and 4 carcinomas of duodenal papilla. Conclusion: Pancreatic adenocarcinoma is one of the commonly encounted tumors and is still very difficult to diagnose at the early stage and to distinguish from other lesions preoperatively. Our study indicates that PCR SSP is an ideal assay in comparison with other methods to detect K ras gene mutation. It is simple, rapid, specific, sensitive and easily generalized for clinical application on preoperative diagnosis.展开更多
目的探讨痰脱落细胞P16基因甲基化及K-ras基因突变联合检测对周围型肺癌的诊断价值。方法选择49例周围型肺结节患者的痰液及术后病理标本作为研究对象,同时以15例正常人作为对照组,应用甲基化特异性PC R(m ethylation-specific PC R,M ...目的探讨痰脱落细胞P16基因甲基化及K-ras基因突变联合检测对周围型肺癌的诊断价值。方法选择49例周围型肺结节患者的痰液及术后病理标本作为研究对象,同时以15例正常人作为对照组,应用甲基化特异性PC R(m ethylation-specific PC R,M SP)和PC R-测序法检测其P16基因甲基化及K-ras基因突变情况。结果痰脱落细胞及肿瘤标本P16 M SP阳性率分别为51.2%(21/41)和58.5%(24/41),两者比较差异无统计学意义(χ2=0.4432,P>0.05),但明显高于良性肺结节及正常人(χ2分别为4.056、6.513及5.677,P<0.05);痰脱落细胞及肿瘤标本K-ras基因突变率为17.1%(7/41)和22.0%(9/41),两者比较差异无统计学意义(χ2=0.0038,P>0.05),而良性肺结节及正常人痰脱落细胞和肿瘤标本未检测到K-ras基因突变。如果以痰脱落细胞P16M SP阳性和K-ras基因突变分别作为筛选肺癌的标准,则对周围型肺癌诊断的敏感度和阴性预测值P16 M SP阳性为51.2%和25.9%,K-ras基因突变为17.1%和19.0%;而P16 M SP阳性及K-ras基因突变联合检测对肺癌的敏感度和阴性预测值分别上升为61.0%和30.4%。结论痰脱落细胞P16基因甲基化及K-ras基因突变联合检测可以提高周围型肺癌的诊断效率,对周围型肺癌的诊断具有一定价值。展开更多
文摘Summary： The specific anti-tumor immune response induced by mouse bone marrow dendritic cells （DCs） lransfected with recombinant adenovirus carrying mutant k-ras genes was investighted. DCs were generated from mouse bone marrow in the presence of rmGM-CSF （3.3 ng/mL） and rmIL-4 （1.3 ng/mL） and detected by FACS, and then transfecled with the recombinant adenovirus encoding mutant k ras gene. The efficacy of transfection and T cell stimulating activity of DCs were detected. CTL activity of the mice vaccinated with DCs was observed. The resuhs showed thai DCs had dendritic veiled morphology. BmDCs highly expressed B7-1（80%）, B7-2（77%）, MHC Ⅱ （70%）, CDllc （65%）, CD40 （70%） and CD54 （96%） with FACS, and no significant difference in the expression was observed before and after the transfection （P〈0.05）. The DCs transfeeled by mutant k-ras gene could significantly stimulate lymphoeytes proliferation as compared with those transfeeted by Ad e or non-modified DCs （P〈0.05）. DC vaccine transfected by mutant k-ras gene could induce CTL activity against Lewis lung cancer, but not against B16. The specific eytotoxicity against Lewis lung cancer in Ad-k-ras/12-transdueed DC group was signifieantly higher than those in the control, vector and non transfeeted DCs groups （P〈0.05）. It was concluded that special antitumor response could be induced by DCs transfected with recombinant adenovirus carrying mutant k-ras genes.
文摘To evaluate the feasibility and clinical significance of the PCR SSP technique in detecting K ras gene mutation at codon 12 in pancreatic adenocarcinoma tissues. 80 specimens of surgical resection or biopsy samples were tested at our hospital from January 1994 to September 1995. Three different special sequence primers (SSP) synthesized according to mutation styles of CGT, GTT, GAT were respectively prepared. Three amplification reactions were performed for each sample. The amplification products were analyzed by conventional polyacrylamide gel electrophoresis, stained with ethidium bromide and observed under UV transillumination. Results: All of the 34 pancreatic adenocarcinoma samples had positive PCR results with the mutation rate 100%. 7 cases were CGT mutation, 18 GGT and 17 GAT mutation, in which 2 types of mutation existed in 8 cases. No mutation appeared in 13 normal pancreatic tissues, 6 insulinomas, 6 chronic pancreatitis, 5 benign pancreatic cysts, 7 bile duct carcinoma, 5 ampulla carcinoma and 4 carcinomas of duodenal papilla. Conclusion: Pancreatic adenocarcinoma is one of the commonly encounted tumors and is still very difficult to diagnose at the early stage and to distinguish from other lesions preoperatively. Our study indicates that PCR SSP is an ideal assay in comparison with other methods to detect K ras gene mutation. It is simple, rapid, specific, sensitive and easily generalized for clinical application on preoperative diagnosis.
文摘目的探讨痰脱落细胞P16基因甲基化及K-ras基因突变联合检测对周围型肺癌的诊断价值。方法选择49例周围型肺结节患者的痰液及术后病理标本作为研究对象,同时以15例正常人作为对照组,应用甲基化特异性PC R(m ethylation-specific PC R,M SP)和PC R-测序法检测其P16基因甲基化及K-ras基因突变情况。结果痰脱落细胞及肿瘤标本P16 M SP阳性率分别为51.2%(21/41)和58.5%(24/41),两者比较差异无统计学意义(χ2=0.4432,P>0.05),但明显高于良性肺结节及正常人(χ2分别为4.056、6.513及5.677,P<0.05);痰脱落细胞及肿瘤标本K-ras基因突变率为17.1%(7/41)和22.0%(9/41),两者比较差异无统计学意义(χ2=0.0038,P>0.05),而良性肺结节及正常人痰脱落细胞和肿瘤标本未检测到K-ras基因突变。如果以痰脱落细胞P16M SP阳性和K-ras基因突变分别作为筛选肺癌的标准,则对周围型肺癌诊断的敏感度和阴性预测值P16 M SP阳性为51.2%和25.9%,K-ras基因突变为17.1%和19.0%;而P16 M SP阳性及K-ras基因突变联合检测对肺癌的敏感度和阴性预测值分别上升为61.0%和30.4%。结论痰脱落细胞P16基因甲基化及K-ras基因突变联合检测可以提高周围型肺癌的诊断效率,对周围型肺癌的诊断具有一定价值。
