B cells play an important role in the clearance of hepatitis B virus （HBV） and protection against reinfection. However, the functional characteristics of these cells that are associated with the outcome of chronic H...B cells play an important role in the clearance of hepatitis B virus （HBV） and protection against reinfection. However, the functional characteristics of these cells that are associated with the outcome of chronic HBV infection remain unknown. We comprehensively investigated the frequency, phenotype, and function of peripheral B-cell subsets from CHB patients in different phases： immune tolerance （IT）, immune activation （IA）, immune clearance （IC）, responders with HBsAg seroconversion （resolved patients, RP）, and healthy controls （HC）. IA patients displayed lower percentages of peripheral blood memory B cells compared with the other groups. Overall polyclonal activation of B cells, indicated by higher levels of activation markers and secretion of IgG and IgM, was observed in IA patients. This B-cell hyperactivation could be induced by increased IFN-a and soluble CD40 ligands in IA patients. Notably, the expression of the co-stimulator molecule CD80 and serum HBsAb and the frequency of HBsAg-specific B cells were significantly decreased in IT, IA, and IC patients compared with HC subjects. More importantly, the B-cell hyperactivation, co-stimulatory molecule downregulation and HBsAg-specific B-cell impairment were reversed in RP patients. The reversal of B-cell hyperactivation and functional impairment is associated with HBsAg seroconversion in chronic hepatitis B patients.展开更多
目的探讨肺癌患者术后并发肺部感染(postoperative pulmonary infection in patients with lung cancer,PPILC)的危险因素。方法选取2011年3月至2018年2月手术治疗的851例肺癌患者为研究对象。鉴定病原菌并采用多因素Logistic回归分析影...目的探讨肺癌患者术后并发肺部感染(postoperative pulmonary infection in patients with lung cancer,PPILC)的危险因素。方法选取2011年3月至2018年2月手术治疗的851例肺癌患者为研究对象。鉴定病原菌并采用多因素Logistic回归分析影响PPILC的危险因素。结果60例肺癌患者发生术后并发肺部感染,共分离出86株病原菌,其中革兰氏阴性菌占60.5%,以铜绿假单胞菌和肺炎克雷伯菌为主;革兰氏阳性菌占33.7%,以金黄色葡萄球菌和表皮葡萄球菌为主;真菌占5.8%。多因素Logistic回归分析显示,TNM分期、吸烟、年龄、合并糖尿病、慢性阻塞性肺疾病、侵入性操作、手术时间、术中出血量、机械通气时间、术后胸腔引流总量、术后血红蛋白和血清白蛋白水平、胸腔引流时间、预防性使用抗菌药物和住院时间为PPILC的影响因素(P<0.05)。结论年龄、吸烟、合并糖尿病、慢性阻塞性肺疾病、TNM分期等可影响PPILC的发生,临床上应加强关注合并以上危险因素患者术后肺部感染的防治。展开更多
【目的】了解多年连作土壤中棉花根际细菌群落结构和动态。【方法】利用高通量测序技术对多年棉花连作土中陆地棉品种TM-1(Gossypium hirsutum L.)不同发育时期的根际细菌16S r DNA进行扩增、测序并分析。【结果】多年棉花连作土中,棉...【目的】了解多年连作土壤中棉花根际细菌群落结构和动态。【方法】利用高通量测序技术对多年棉花连作土中陆地棉品种TM-1(Gossypium hirsutum L.)不同发育时期的根际细菌16S r DNA进行扩增、测序并分析。【结果】多年棉花连作土中,棉花根际细菌的主导菌门为变形菌门(Proteobacteria)、酸杆菌门(Acidobacteria)、浮霉菌门(Planctomycetes)、拟杆菌门(Bacteroidetes)。受棉花根系影响相对丰度变化较大的菌门为4个主导菌门以及厚壁菌门(Firmicutes),其中酸杆菌门、拟杆菌门、浮霉菌门的相对丰度受到棉花根系的促进,而厚壁菌门、变形菌门的相对丰度受到抑制。不同发育时期棉花根际细菌α-多样性没有显著差异,但是根际细菌群落结构间存在显著差异,且在棉花花期与蕾期的差异显著高于蕾期与苗期的差异。多年棉花连作土壤中的根际细菌群落α-多样性显著高于非根际土壤,根际与非根际土壤中细菌β-多样性在棉花花期最大。【结论】确定了多年棉花连作土中棉花根际细菌的群落结构及其动态,发现棉花在花期对根际细菌群落结构的影响较大。展开更多
文摘B cells play an important role in the clearance of hepatitis B virus （HBV） and protection against reinfection. However, the functional characteristics of these cells that are associated with the outcome of chronic HBV infection remain unknown. We comprehensively investigated the frequency, phenotype, and function of peripheral B-cell subsets from CHB patients in different phases： immune tolerance （IT）, immune activation （IA）, immune clearance （IC）, responders with HBsAg seroconversion （resolved patients, RP）, and healthy controls （HC）. IA patients displayed lower percentages of peripheral blood memory B cells compared with the other groups. Overall polyclonal activation of B cells, indicated by higher levels of activation markers and secretion of IgG and IgM, was observed in IA patients. This B-cell hyperactivation could be induced by increased IFN-a and soluble CD40 ligands in IA patients. Notably, the expression of the co-stimulator molecule CD80 and serum HBsAb and the frequency of HBsAg-specific B cells were significantly decreased in IT, IA, and IC patients compared with HC subjects. More importantly, the B-cell hyperactivation, co-stimulatory molecule downregulation and HBsAg-specific B-cell impairment were reversed in RP patients. The reversal of B-cell hyperactivation and functional impairment is associated with HBsAg seroconversion in chronic hepatitis B patients.
文摘目的探讨肺癌患者术后并发肺部感染(postoperative pulmonary infection in patients with lung cancer,PPILC)的危险因素。方法选取2011年3月至2018年2月手术治疗的851例肺癌患者为研究对象。鉴定病原菌并采用多因素Logistic回归分析影响PPILC的危险因素。结果60例肺癌患者发生术后并发肺部感染,共分离出86株病原菌,其中革兰氏阴性菌占60.5%,以铜绿假单胞菌和肺炎克雷伯菌为主;革兰氏阳性菌占33.7%,以金黄色葡萄球菌和表皮葡萄球菌为主;真菌占5.8%。多因素Logistic回归分析显示,TNM分期、吸烟、年龄、合并糖尿病、慢性阻塞性肺疾病、侵入性操作、手术时间、术中出血量、机械通气时间、术后胸腔引流总量、术后血红蛋白和血清白蛋白水平、胸腔引流时间、预防性使用抗菌药物和住院时间为PPILC的影响因素(P<0.05)。结论年龄、吸烟、合并糖尿病、慢性阻塞性肺疾病、TNM分期等可影响PPILC的发生,临床上应加强关注合并以上危险因素患者术后肺部感染的防治。
文摘【目的】了解多年连作土壤中棉花根际细菌群落结构和动态。【方法】利用高通量测序技术对多年棉花连作土中陆地棉品种TM-1(Gossypium hirsutum L.)不同发育时期的根际细菌16S r DNA进行扩增、测序并分析。【结果】多年棉花连作土中,棉花根际细菌的主导菌门为变形菌门(Proteobacteria)、酸杆菌门(Acidobacteria)、浮霉菌门(Planctomycetes)、拟杆菌门(Bacteroidetes)。受棉花根系影响相对丰度变化较大的菌门为4个主导菌门以及厚壁菌门(Firmicutes),其中酸杆菌门、拟杆菌门、浮霉菌门的相对丰度受到棉花根系的促进,而厚壁菌门、变形菌门的相对丰度受到抑制。不同发育时期棉花根际细菌α-多样性没有显著差异,但是根际细菌群落结构间存在显著差异,且在棉花花期与蕾期的差异显著高于蕾期与苗期的差异。多年棉花连作土壤中的根际细菌群落α-多样性显著高于非根际土壤,根际与非根际土壤中细菌β-多样性在棉花花期最大。【结论】确定了多年棉花连作土中棉花根际细菌的群落结构及其动态,发现棉花在花期对根际细菌群落结构的影响较大。
