目的探讨胸腺肽α1对脓毒症的Th17和Treg淋巴细胞的极化效应,了解其改善脓毒症免疫抑制的作用机制。方法建立盲肠结扎穿孔(CLP)的脓毒症大鼠模型,共29只大鼠分为5个实验组,分别是正常组(5只)、假手术组(5只)、CLP组(6只)、CLP+0.9%Na Cl...目的探讨胸腺肽α1对脓毒症的Th17和Treg淋巴细胞的极化效应,了解其改善脓毒症免疫抑制的作用机制。方法建立盲肠结扎穿孔(CLP)的脓毒症大鼠模型,共29只大鼠分为5个实验组,分别是正常组(5只)、假手术组(5只)、CLP组(6只)、CLP+0.9%Na Cl(NS)组(6只)和CLP+胸腺肽α1治疗组(7只)进行以下实验:(1)检测并对比正常组、假手术组和CLP组术后6 h的Th17/Treg淋巴细胞的表达情况,探讨脓毒症时Th17/Treg淋巴细胞的功能性极化情况;(2)检测并对比正常组、CLP组、CLP+NS组和CLP+胸腺肽α1治疗组处理后6 h的Th17/Treg淋巴细胞的表达情况,探讨胸腺肽α1对脓毒症的Th17/Treg淋巴细胞功能性极化的治疗效应;(3)分析CLP组(10只)与CLP+胸腺肽α1治疗组(10只)的生存时间,了解胸腺肽α1对脓毒症大鼠模型的生存效应。结果 (1)对比正常组,CLP术后6 h的Th17淋巴细胞(占总淋巴细胞的百分比,占LN%)降低(0.15 vs 3.47,P=0.018),差异有统计学意义。(2)CLP+胸腺肽α1治疗组的Th17淋巴细胞(占LN%)高于CLP+NS组(1.69 vs 0.16,P=0.034)和CLP组(1.69 vs 0.15,P=0.033),差异有统计学意义,低于正常组(1.69 vs 3.47,P=0.189),但差异无统计学意义;Treg淋巴细胞(占LN%)均高于CLP+NS组(7.34 vs 3.64,P=0.016)、CLP组(7.34 vs 3.41,P=0.012)和正常组(7.34 vs4.03,P=0.038),差异有统计学意义。(3)CLP+胸腺肽α1治疗组的平均生存时间(2.40 d vs 1.85 d)、24 h生存率(80%vs 70%)和48 h生存率(60%vs 40%)都高于CLP组,但差异无统计学意义(P=0.376)。结论 1.在脓毒症大鼠模型中,Th17淋巴细胞极化下降可能为脓毒症早期免疫抑制的主要表现;2.胸腺肽α1在脓毒症大鼠模型中,可明显增加Th17淋巴细胞和Treg淋巴细胞的功能性极化,而对脓毒症大鼠模型的生存率则无显著影响。展开更多
The three-dimensional structure of recombinant hepatitis B core antigen(HBcAg) particles truncated at residue 154(HBcAg-154) was determined to 7.8 A resolution by cryo-electron microscopy(cryoEM) and computer re...The three-dimensional structure of recombinant hepatitis B core antigen(HBcAg) particles truncated at residue 154(HBcAg-154) was determined to 7.8 A resolution by cryo-electron microscopy(cryoEM) and computer reconstruction.The capsid of HBcAg-154 is mainly constituted by α-helical folds,highly similar to that of HBcAg-149.The C-terminal region between residues 155 and 183 of the core protein is more crucial to the encapsidation of RNA,and the short C-terminal tail of HBcAg-154 results in a nearly empty capsid.展开更多
文摘目的探讨胸腺肽α1对脓毒症的Th17和Treg淋巴细胞的极化效应,了解其改善脓毒症免疫抑制的作用机制。方法建立盲肠结扎穿孔(CLP)的脓毒症大鼠模型,共29只大鼠分为5个实验组,分别是正常组(5只)、假手术组(5只)、CLP组(6只)、CLP+0.9%Na Cl(NS)组(6只)和CLP+胸腺肽α1治疗组(7只)进行以下实验:(1)检测并对比正常组、假手术组和CLP组术后6 h的Th17/Treg淋巴细胞的表达情况,探讨脓毒症时Th17/Treg淋巴细胞的功能性极化情况;(2)检测并对比正常组、CLP组、CLP+NS组和CLP+胸腺肽α1治疗组处理后6 h的Th17/Treg淋巴细胞的表达情况,探讨胸腺肽α1对脓毒症的Th17/Treg淋巴细胞功能性极化的治疗效应;(3)分析CLP组(10只)与CLP+胸腺肽α1治疗组(10只)的生存时间,了解胸腺肽α1对脓毒症大鼠模型的生存效应。结果 (1)对比正常组,CLP术后6 h的Th17淋巴细胞(占总淋巴细胞的百分比,占LN%)降低(0.15 vs 3.47,P=0.018),差异有统计学意义。(2)CLP+胸腺肽α1治疗组的Th17淋巴细胞(占LN%)高于CLP+NS组(1.69 vs 0.16,P=0.034)和CLP组(1.69 vs 0.15,P=0.033),差异有统计学意义,低于正常组(1.69 vs 3.47,P=0.189),但差异无统计学意义;Treg淋巴细胞(占LN%)均高于CLP+NS组(7.34 vs 3.64,P=0.016)、CLP组(7.34 vs 3.41,P=0.012)和正常组(7.34 vs4.03,P=0.038),差异有统计学意义。(3)CLP+胸腺肽α1治疗组的平均生存时间(2.40 d vs 1.85 d)、24 h生存率(80%vs 70%)和48 h生存率(60%vs 40%)都高于CLP组,但差异无统计学意义(P=0.376)。结论 1.在脓毒症大鼠模型中,Th17淋巴细胞极化下降可能为脓毒症早期免疫抑制的主要表现;2.胸腺肽α1在脓毒症大鼠模型中,可明显增加Th17淋巴细胞和Treg淋巴细胞的功能性极化,而对脓毒症大鼠模型的生存率则无显著影响。
基金supported by special funds of the National Natural Science Foundation of China (Grant No. 10274106)
文摘The three-dimensional structure of recombinant hepatitis B core antigen(HBcAg) particles truncated at residue 154(HBcAg-154) was determined to 7.8 A resolution by cryo-electron microscopy(cryoEM) and computer reconstruction.The capsid of HBcAg-154 is mainly constituted by α-helical folds,highly similar to that of HBcAg-149.The C-terminal region between residues 155 and 183 of the core protein is more crucial to the encapsidation of RNA,and the short C-terminal tail of HBcAg-154 results in a nearly empty capsid.