One of great leaders of our era, comrade Deng Xiaoping has passed away and left us forever.Chinese circles of science and technology were especially filled with the deepest sorrow when we heard the sad news of his dea...One of great leaders of our era, comrade Deng Xiaoping has passed away and left us forever.Chinese circles of science and technology were especially filled with the deepest sorrow when we heard the sad news of his death because we since then lost a leader of foresight and sagacity, a venerable elder as well as a good teacher and a helpful friend. But his enduring contribution to Chinese science, and his earnest teachings to Chinese scientists have been, and will be, a far-reaching and unflagging influence in the years to come.展开更多
The multifunctional secondary metabolites known as cyclic lipopeptides(CLPs),which are produced by a large variety of bacteria,have become a key category of plant immunity elicitors.Pseudomonas-CLPs(PsCLPs)are extreme...The multifunctional secondary metabolites known as cyclic lipopeptides(CLPs),which are produced by a large variety of bacteria,have become a key category of plant immunity elicitors.Pseudomonas-CLPs(PsCLPs)are extremely diverse in structure and biological activity.However,an understanding of CLP-plant structure–function interactions currently remains elusive.Here,we identify medpeptin,a novel CLP from Pseudomonas mediterranea that consists of 22 amino acids.Medpeptin is synthesized by a non-ribosomal peptide synthase(NRPS)gene cluster and regulated by a quorum-sensing system.Further research indicates that medpeptin does not exhibit antimicrobial activity;instead,it induces plant cell death immunity and confers resistance to bacterial infection.Comparative transcriptome analysis and virus-induced gene silencing(VIGS)reveal a set of immune signaling candidates involved in medpeptin perception.Silencing of a cell-wall leucine-rich repeat extensin protein(NbLRX3)or a receptor-like protein kinase(NbRLK25)—but not BAK1 or SGT1—compromises medpeptin-triggered cell death and resistance to pathogen infection in Nicotiana benthamiana.Our findings point to a noncanonical mechanism of CLP sensing and suggest perspectives for the development of plant disease resistance.展开更多
目的:考察免疫检查点人内源性逆转录病毒-H长端重复相关蛋白2(human endogenous retrovirus-H long terminal repeat-associating protein 2,HHLA2)和程序性死亡配体-1(programmed death ligand-1,PD-L1)在肝细胞癌组织中的表达,分析两...目的:考察免疫检查点人内源性逆转录病毒-H长端重复相关蛋白2(human endogenous retrovirus-H long terminal repeat-associating protein 2,HHLA2)和程序性死亡配体-1(programmed death ligand-1,PD-L1)在肝细胞癌组织中的表达,分析两者之间表达的相关性及与临床病理特征和临床预后关系。方法:应用免疫组织化学染色方法检测90例肝癌组织及相对应癌旁组织中HHLA2和PD-L1的表达,分析HHLA2和PD-L1在肝癌组织中表达的相关性,并分析HHLA2和PD-L1的表达与肝癌的临床分期、血清甲胎蛋白(AFP)水平、病理分级、慢性乙型肝炎病毒感染、血管侵犯等临床病理参数和总生存时间(OS)之间的关系。结果:在肝癌组织中,HHLA2阳性表达率(49/90,54.4%)高于癌旁组织(33/90,36.7%),但差异无统计学意义(P>0.05);PD-L1阳性表达率(52/90,57.7%)较癌旁组织(44/90,48.9%)差异无统计学意义(P>0.05)。HHLA2与PD-L1表达在肝癌组织中呈正相关关系(r=0.280,P<0.05)。HHLA2在肝癌组织中的表达与肝癌病人年龄、性别、病理分级、血清AFP水平、血管侵犯无关,与临床分期、慢性乙型肝炎病毒感染有关(P<0.05)。PD-L1的表达与肝癌病人年龄、性别、血清AFP水平、血管侵犯、慢性乙型肝炎病毒感染无关,与临床分期和病理分级有关(P<0.05)。HHLA2与PD-L1阳性表达的肝癌病人中位OS同阴性表达病人比较差异无统计学意义(P>0.05)。结论:免疫检查点分子HHLA2与PD-L1在肝癌组织表达有升高趋势,两者之间表达呈正相关关系,HHLA2和PD-L1的表达状态与临床预后无关。HHLA2作为新型免疫检查点分子能否成为晚期肝癌未来潜在的治疗靶点仍需进一步探索研究。展开更多
Of repeated hits and repeated explosions after first explosion for a birth and death process with explosion some properties are investigated. The properties of repeated hits after first explosion may be expressed by t...Of repeated hits and repeated explosions after first explosion for a birth and death process with explosion some properties are investigated. The properties of repeated hits after first explosion may be expressed by the properties of the first hit after the first explosion.展开更多
目的探讨人内源性逆转录病毒-H长末端重复关联蛋白2(human endogenous retrovirus subfamily H long terminal repeat associating protein 2,HHLA2)与程序性死亡受体配体-1(programmed death ligand-1,PD-L1)在结直肠癌组织中的表达及...目的探讨人内源性逆转录病毒-H长末端重复关联蛋白2(human endogenous retrovirus subfamily H long terminal repeat associating protein 2,HHLA2)与程序性死亡受体配体-1(programmed death ligand-1,PD-L1)在结直肠癌组织中的表达及临床意义。方法收集2017年3月至2017年9月在联勤保障部队第九四〇医院确诊并经手术治疗的临床病理资料完整的120例结直肠腺癌。采用组织芯片技术和免疫组织化学染色检测这120例结直肠癌组织中HHLA2、PD-L1和TP53的表达,分析其与患者临床病理特征及预后的关系。结果结直肠癌组织中PD-L1表达在肿瘤原发部位方面比较,差异具有统计学意义(P<0.05);HHLA2表达在肿瘤分化程度方面比较,差异具有统计学意义(P<0.05)。HHLA2强阳性患者无进展生存期(progression-free survival,PFS)短于其他患者,差异具有统计学意义(P<0.01)。多因素Cox回归分析显示,PD-L1表达是结直肠癌患者预后的独立危险因素(P<0.05)。肿瘤细胞中PD-L1表达分别与HHLA2表达(r=0.211,P<0.05)和TP53表达(r=0.232,P<0.05)呈正相关。结论HHLA2可能参与结直肠癌的发生和发展,高表达提示患者预后较差。PD-L1表达与HHLA和TP53表达呈正相关。展开更多
Today’s news is tomorrow’s history.Journalists who record news day after day often become writers with deep insight.American journalist Agnes Smedley was one of these shining examples.
文摘One of great leaders of our era, comrade Deng Xiaoping has passed away and left us forever.Chinese circles of science and technology were especially filled with the deepest sorrow when we heard the sad news of his death because we since then lost a leader of foresight and sagacity, a venerable elder as well as a good teacher and a helpful friend. But his enduring contribution to Chinese science, and his earnest teachings to Chinese scientists have been, and will be, a far-reaching and unflagging influence in the years to come.
基金funded by the National Key R&D Program of China(2022YFD1901300)the National Natural Science Foundation of China(31901932)+2 种基金the Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences(CAAS-ZDRW202308 and Y2022PT12)the Beijing Innovation Consortium of Agriculture Research System(BAIC04-2022)the Science and Technology Programs of the Zunyi Tobacco(2021XM03)。
文摘The multifunctional secondary metabolites known as cyclic lipopeptides(CLPs),which are produced by a large variety of bacteria,have become a key category of plant immunity elicitors.Pseudomonas-CLPs(PsCLPs)are extremely diverse in structure and biological activity.However,an understanding of CLP-plant structure–function interactions currently remains elusive.Here,we identify medpeptin,a novel CLP from Pseudomonas mediterranea that consists of 22 amino acids.Medpeptin is synthesized by a non-ribosomal peptide synthase(NRPS)gene cluster and regulated by a quorum-sensing system.Further research indicates that medpeptin does not exhibit antimicrobial activity;instead,it induces plant cell death immunity and confers resistance to bacterial infection.Comparative transcriptome analysis and virus-induced gene silencing(VIGS)reveal a set of immune signaling candidates involved in medpeptin perception.Silencing of a cell-wall leucine-rich repeat extensin protein(NbLRX3)or a receptor-like protein kinase(NbRLK25)—but not BAK1 or SGT1—compromises medpeptin-triggered cell death and resistance to pathogen infection in Nicotiana benthamiana.Our findings point to a noncanonical mechanism of CLP sensing and suggest perspectives for the development of plant disease resistance.
文摘目的:考察免疫检查点人内源性逆转录病毒-H长端重复相关蛋白2(human endogenous retrovirus-H long terminal repeat-associating protein 2,HHLA2)和程序性死亡配体-1(programmed death ligand-1,PD-L1)在肝细胞癌组织中的表达,分析两者之间表达的相关性及与临床病理特征和临床预后关系。方法:应用免疫组织化学染色方法检测90例肝癌组织及相对应癌旁组织中HHLA2和PD-L1的表达,分析HHLA2和PD-L1在肝癌组织中表达的相关性,并分析HHLA2和PD-L1的表达与肝癌的临床分期、血清甲胎蛋白(AFP)水平、病理分级、慢性乙型肝炎病毒感染、血管侵犯等临床病理参数和总生存时间(OS)之间的关系。结果:在肝癌组织中,HHLA2阳性表达率(49/90,54.4%)高于癌旁组织(33/90,36.7%),但差异无统计学意义(P>0.05);PD-L1阳性表达率(52/90,57.7%)较癌旁组织(44/90,48.9%)差异无统计学意义(P>0.05)。HHLA2与PD-L1表达在肝癌组织中呈正相关关系(r=0.280,P<0.05)。HHLA2在肝癌组织中的表达与肝癌病人年龄、性别、病理分级、血清AFP水平、血管侵犯无关,与临床分期、慢性乙型肝炎病毒感染有关(P<0.05)。PD-L1的表达与肝癌病人年龄、性别、血清AFP水平、血管侵犯、慢性乙型肝炎病毒感染无关,与临床分期和病理分级有关(P<0.05)。HHLA2与PD-L1阳性表达的肝癌病人中位OS同阴性表达病人比较差异无统计学意义(P>0.05)。结论:免疫检查点分子HHLA2与PD-L1在肝癌组织表达有升高趋势,两者之间表达呈正相关关系,HHLA2和PD-L1的表达状态与临床预后无关。HHLA2作为新型免疫检查点分子能否成为晚期肝癌未来潜在的治疗靶点仍需进一步探索研究。
基金Project supported by the National Natural Science Foundation of China (Grant No. 19761028)the Centre of Researching Mathematics and Forstering Higher Talent, the Ministry of Education of China
文摘Of repeated hits and repeated explosions after first explosion for a birth and death process with explosion some properties are investigated. The properties of repeated hits after first explosion may be expressed by the properties of the first hit after the first explosion.
文摘目的探讨人内源性逆转录病毒-H长末端重复关联蛋白2(human endogenous retrovirus subfamily H long terminal repeat associating protein 2,HHLA2)与程序性死亡受体配体-1(programmed death ligand-1,PD-L1)在结直肠癌组织中的表达及临床意义。方法收集2017年3月至2017年9月在联勤保障部队第九四〇医院确诊并经手术治疗的临床病理资料完整的120例结直肠腺癌。采用组织芯片技术和免疫组织化学染色检测这120例结直肠癌组织中HHLA2、PD-L1和TP53的表达,分析其与患者临床病理特征及预后的关系。结果结直肠癌组织中PD-L1表达在肿瘤原发部位方面比较,差异具有统计学意义(P<0.05);HHLA2表达在肿瘤分化程度方面比较,差异具有统计学意义(P<0.05)。HHLA2强阳性患者无进展生存期(progression-free survival,PFS)短于其他患者,差异具有统计学意义(P<0.01)。多因素Cox回归分析显示,PD-L1表达是结直肠癌患者预后的独立危险因素(P<0.05)。肿瘤细胞中PD-L1表达分别与HHLA2表达(r=0.211,P<0.05)和TP53表达(r=0.232,P<0.05)呈正相关。结论HHLA2可能参与结直肠癌的发生和发展,高表达提示患者预后较差。PD-L1表达与HHLA和TP53表达呈正相关。
文摘Today’s news is tomorrow’s history.Journalists who record news day after day often become writers with deep insight.American journalist Agnes Smedley was one of these shining examples.
