从口蹄疫病毒(foot-and-m ou th d isease v irus,FM DV)细胞培养物中提取总RNA,经一步法RT-PCR获得了长约230 bp的3B基因片段,将PCR产物连接到pM D-18T载体上并测序,用B amHⅠ与H indⅢ双酶切后,将3B基因融合到pGEX-KG载体上形成表达质...从口蹄疫病毒(foot-and-m ou th d isease v irus,FM DV)细胞培养物中提取总RNA,经一步法RT-PCR获得了长约230 bp的3B基因片段,将PCR产物连接到pM D-18T载体上并测序,用B amHⅠ与H indⅢ双酶切后,将3B基因融合到pGEX-KG载体上形成表达质粒pGEX-KG-3B,转化到BL 21(DE 3)中在27℃诱导表达,将表达产物进行SDS-PAGE和蛋白质斑点EL ISA。结果表明3B基因主要以可溶形式高效表达,表达产物具有免疫原性。以纯化的表达产物为抗原建立了间接酶联免疫吸附试验(I-EL ISA)。方阵滴定其最佳包被浓度是6.1μg/孔,最佳血清稀释倍数为1∶80,通过测定36份FM DV阴性血清,确定了该方法的阳性判定标准。结果表明,该方法特异性强、重复性好;用3B-EL ISA方法与美国联合生物医学公司(U B I)生产的合成肽检测试剂盒U B I○RFM DV N S-EL ISA对比检测44份血清样品,符合率为93.1%。证明3B-EL ISA方法可用于口蹄疫的鉴别诊断。展开更多
Objective：The programmed cell death-1 receptor/programmed cell death-1 ligand （PD-1/PD-L1） pathway plays a crucial role in tumor evasion from host immunity.This study was designed to evaluate the association betwee...Objective：The programmed cell death-1 receptor/programmed cell death-1 ligand （PD-1/PD-L1） pathway plays a crucial role in tumor evasion from host immunity.This study was designed to evaluate the association between circulating PD-L1 expression and prognosis in patients with advanced gastric cancer.Methods：Totally 80 advanced gastric cancer patients and 40 health controls from Beijing Cancer Hospital were enrolled in the present study.Circulating PD-L1 expression was tested by enzymelinked immunosorbent assay （ELISA）.The associations between the expression level of PD-L1 and clinicopathological features and prognosis were analyzed statistically.Results：Expression of PD-L1 in advanced gastric cancer patients was significandy up-regulated compared with health people （P=0.006）.The expression of PD-L1 was significantly correlated with differentiation and lymph node metastasis （P=0.026 and P=0.041,respectively）.Although we didn＇t find significant difference in all advanced gastric cancer patients with different PD-L1 expression,the adenocarcinoma patients with higher up-regulated PD-L1 expression had much better prognosis than low expression patients （65.6％ vs.44.7％,P=0.028）.Conclusions：PD-L1 was elevated in advance gastric cancer patients and may play an important role in tumor immune evasion and patients prognosis.展开更多
文摘从口蹄疫病毒(foot-and-m ou th d isease v irus,FM DV)细胞培养物中提取总RNA,经一步法RT-PCR获得了长约230 bp的3B基因片段,将PCR产物连接到pM D-18T载体上并测序,用B amHⅠ与H indⅢ双酶切后,将3B基因融合到pGEX-KG载体上形成表达质粒pGEX-KG-3B,转化到BL 21(DE 3)中在27℃诱导表达,将表达产物进行SDS-PAGE和蛋白质斑点EL ISA。结果表明3B基因主要以可溶形式高效表达,表达产物具有免疫原性。以纯化的表达产物为抗原建立了间接酶联免疫吸附试验(I-EL ISA)。方阵滴定其最佳包被浓度是6.1μg/孔,最佳血清稀释倍数为1∶80,通过测定36份FM DV阴性血清,确定了该方法的阳性判定标准。结果表明,该方法特异性强、重复性好;用3B-EL ISA方法与美国联合生物医学公司(U B I)生产的合成肽检测试剂盒U B I○RFM DV N S-EL ISA对比检测44份血清样品,符合率为93.1%。证明3B-EL ISA方法可用于口蹄疫的鉴别诊断。
文摘Objective：The programmed cell death-1 receptor/programmed cell death-1 ligand （PD-1/PD-L1） pathway plays a crucial role in tumor evasion from host immunity.This study was designed to evaluate the association between circulating PD-L1 expression and prognosis in patients with advanced gastric cancer.Methods：Totally 80 advanced gastric cancer patients and 40 health controls from Beijing Cancer Hospital were enrolled in the present study.Circulating PD-L1 expression was tested by enzymelinked immunosorbent assay （ELISA）.The associations between the expression level of PD-L1 and clinicopathological features and prognosis were analyzed statistically.Results：Expression of PD-L1 in advanced gastric cancer patients was significandy up-regulated compared with health people （P=0.006）.The expression of PD-L1 was significantly correlated with differentiation and lymph node metastasis （P=0.026 and P=0.041,respectively）.Although we didn＇t find significant difference in all advanced gastric cancer patients with different PD-L1 expression,the adenocarcinoma patients with higher up-regulated PD-L1 expression had much better prognosis than low expression patients （65.6％ vs.44.7％,P=0.028）.Conclusions：PD-L1 was elevated in advance gastric cancer patients and may play an important role in tumor immune evasion and patients prognosis.
