AIM: To determine the overall prevalence of H pylori and CagA positive H pylori infection and the prevalence of other bacterial and viral causes of chronic infection in patients with coronary heart disease (CHD), and ...AIM: To determine the overall prevalence of H pylori and CagA positive H pylori infection and the prevalence of other bacterial and viral causes of chronic infection in patients with coronary heart disease (CHD), and the potential role of anti-heat-shock protein 60 (Hsp60) anti- body response to these proteins in increasing the risk of CHD development. METHODS: Eighty patients with CHD and 160 controls were employed. We also compared the levels of anti- heat-shock protein 60 (Hsp60) antibodies in the two groups. The H pylori infection and the CagA status were determined serologically, using commercially available enzyme-linked immunosorbent assays (ELISA), and a Western blotting method developed in our laboratory. Systemic antibodies to Hsp60 were determined by a sandwich ELISA, using a polyclonal antibody to Hsp60 to sensitise polystyrene plates and a commercially available human Hsp60 as an antigen. RESULTS: The overall prevalence of H pylori infec- tion was 78.7% (n = 63) in patients and 76.2% (n = 122) in controls (P = 0.07). Patients infected by CagA- positive (CagA+) H pylori strains were 71.4% (n = 45) vs 52.4% of infected controls (P = 0.030, OR = 2.27). Sys-temic levels of IgG to Hsp60 were increased in H pylori- negative patients compared with uninfected controls (P < 0.001) and CagA-positive infected patients compared with CagA-positive infected controls (P = 0.007). CONCLUSION: CagA positive H pylori infection may concur to the development of CHD; high levels of anti- Hsp60 antibodies may constitute a marker and/or a con- comitant pathogenic factor of the disease.展开更多
目的探讨地鳖纤溶活性蛋白(fibrinolytic protein from Eupolyphaga sinensis Walker,EFP)对H22荷瘤小鼠的抑瘤功效。方法采用水提取法对地鳖进行成分分离;皮下接种肿瘤细胞建立荷瘤小鼠动物模型;灌胃和皮下注射法观察EFP的抑瘤作用;EL...目的探讨地鳖纤溶活性蛋白(fibrinolytic protein from Eupolyphaga sinensis Walker,EFP)对H22荷瘤小鼠的抑瘤功效。方法采用水提取法对地鳖进行成分分离;皮下接种肿瘤细胞建立荷瘤小鼠动物模型;灌胃和皮下注射法观察EFP的抑瘤作用;ELISA法检测血清抗H22抗体水平;记录各组体重变化、脾脏和胸腺等免疫器官的器官系数,检测肝脏丙二醛(MDA)水平、肝脏超氧化物歧化酶(SOD)活性、肝脏谷丙转氨酶(GPT)和谷草转氨酶(GOT)以及血清谷丙转氨酶(GPT)活力等生理生化指标。结果EFP具有明显的抑瘤活性。经EFP灌胃和皮下注射后的荷瘤小鼠,与对照组荷瘤小鼠相比其胸腺指数、脾指数明显增加;抗H22抗体水平以及MDA、SOD、GPT、GOT活性明显增加;肿瘤生长缓慢。结论EFP是地鳖抗肿瘤作用的主要有效成分,EFP在动物体内具有抗肿瘤作用,能通过增强荷瘤小鼠参与免疫抗体以及相关酶的活性而发挥抗肿瘤作用。展开更多
AIM: To explore the mechanism by which H pylori causes activation of gastric epithelial cells. METHODS: A VacA (+) and CagA (+) standard H pylori line NCTC 11637 and a human gastric adenocarcinoma derived gastric epit...AIM: To explore the mechanism by which H pylori causes activation of gastric epithelial cells. METHODS: A VacA (+) and CagA (+) standard H pylori line NCTC 11637 and a human gastric adenocarcinoma derived gastric epithelial cell line BGC-823 were applied in the study. MTT assay and 3H-TdR incorporation test were used to detect the proliferation of BGC-823 cells and Western blotting was used to detect the activity and existence of related proteins. RESULTS: Incubation with H pylori extract increased the proliferation of gastric epithelial cells, reflected by both live cell number and DNA synthesis rate. The activity of extracellular signal-regulated protein kinase (ERK) signal transduction cascade increased within 20 min after in- cubation with H pylori extract and appeared to be a sus- tained event. MAPK/ERK kinase (MEK) inhibitor PD98059 abolished the action of H pylori extract on both ERK activity and cell proliferation. Incubation with H pylori extract increased c-Fos expression and SRE-dependent gene expression. H pylori extract caused phosphorylation of several proteins including a protein with molecular size of 97.4 kDa and tyrosine kinase inhibitor genistein inhibited the activation of ERK and the proliferation of cells caused by H pylori extract. CONCLUSION: Biologically active elements in H pylori extract cause proliferation of gastric epithelial cells through activating tyrosine kinase and ERK signal trans- duction cascade.展开更多
利用原核表达系统表达了小反刍兽疫病毒(peste des petits ruminants virus,PPRV)血凝素蛋白(H)作为ELISA包被抗原,建立了PPR抗体检测的间接ELISA方法,并对所建立方法的相关条件进行了优化。优化结果显示:抗原的最佳包被质量浓度为20mg...利用原核表达系统表达了小反刍兽疫病毒(peste des petits ruminants virus,PPRV)血凝素蛋白(H)作为ELISA包被抗原,建立了PPR抗体检测的间接ELISA方法,并对所建立方法的相关条件进行了优化。优化结果显示:抗原的最佳包被质量浓度为20mg/L;血清最佳稀释度为1∶80;酶标二抗的最佳浓度为1∶20 000;抗原抗体反应时间和酶标二抗孵育时间均为45min。批内及批间重复试验结果变异系数均小于10%,说明该方法具有较好的可重复性。检测羊口疮、羊痘、蓝舌病和山羊支原体血清结果均为阴性,说明该方法具有良好的特异性。检测临床血清样品80份,并与国外c-ELISA试剂盒比较,符合率为93.75%。因此,本方法可以用于小反刍兽疫的临床血清抗体检测及流行病学调查。展开更多
Background:Angiogenesis is described as a complex process in which new microvessels sprout from endothelial cells of existing vasculature.This study aimed to determine whether long non-coding RNA(lncRNA)H19 induced th...Background:Angiogenesis is described as a complex process in which new microvessels sprout from endothelial cells of existing vasculature.This study aimed to determine whether long non-coding RNA(lncRNA)H19 induced the angiogenesis of gastric cancer(GC)and its possible mechanism.Methods:Gene expression level was determined by quantitative real-time polymerase chain reaction and western blotting.Cell counting kit-8,transwell,5-Ethynyl-2′-deoxyuridine(EdU),colony formation assay,and human umbilical vein endothelial cells(HUVECs)angiogenesis assay as well as Matrigel plug assay were conducted to study the proliferation,migration,and angiogenesis of GC in vitro and in vivo.The binding protein of H19 was found by RNA pull-down and RNA Immunoprecipitation(RIP).High-throughput sequencing was performed and next Gene Ontology(GO)as well as Kyoto Encyclopedia of Genes and Genomes(KEGG)analysis was conducted to analyze the genes that are under H19 regulation.Methylated RIP(me-RIP)assay was used to investigate the sites and abundance among target mRNA.The transcription factor acted as upstream of H19 was determined through chromatin immunoprecipitation(ChIP)and luciferase assay.Results:In this study,we found that hypoxia-induced factor(HIF)-1a could bind to the promoter region of H19,leading to H19 overexpression.High expression of H19 was correlated with angiogenesis in GC,and H19 knocking down could inhibit cell proliferation,migration and angiogenesis.Mechanistically,the oncogenic role of H19 was achieved by binding with the N^(6)-methyladenosine(m^(6)A)reader YTH domain-containing family protein 1(YTHDF1),which could recognize the m^(6)A site on the 3′-untransated regions(3′-UTR)of scavenger receptor class B member 1(SCARB1)mRNA,resulting in over-translation of SCARB1 and thus promoting the proliferation,migration,and angiogenesis of GC cells.Conclusion:HIF-1a induced overexpression of H19 via binding with the promoter of H19,and H19 promoted GC cells proliferation,migration and angiogenesis through YTHDF1/SCARB1,w展开更多
基金Supported by a grant from the University of Siena, PAR 2004 "H pylori infection, hosts’ aplotypes of inflammatory cytokines and the risk of ischemic heart disease"
文摘AIM: To determine the overall prevalence of H pylori and CagA positive H pylori infection and the prevalence of other bacterial and viral causes of chronic infection in patients with coronary heart disease (CHD), and the potential role of anti-heat-shock protein 60 (Hsp60) anti- body response to these proteins in increasing the risk of CHD development. METHODS: Eighty patients with CHD and 160 controls were employed. We also compared the levels of anti- heat-shock protein 60 (Hsp60) antibodies in the two groups. The H pylori infection and the CagA status were determined serologically, using commercially available enzyme-linked immunosorbent assays (ELISA), and a Western blotting method developed in our laboratory. Systemic antibodies to Hsp60 were determined by a sandwich ELISA, using a polyclonal antibody to Hsp60 to sensitise polystyrene plates and a commercially available human Hsp60 as an antigen. RESULTS: The overall prevalence of H pylori infec- tion was 78.7% (n = 63) in patients and 76.2% (n = 122) in controls (P = 0.07). Patients infected by CagA- positive (CagA+) H pylori strains were 71.4% (n = 45) vs 52.4% of infected controls (P = 0.030, OR = 2.27). Sys-temic levels of IgG to Hsp60 were increased in H pylori- negative patients compared with uninfected controls (P < 0.001) and CagA-positive infected patients compared with CagA-positive infected controls (P = 0.007). CONCLUSION: CagA positive H pylori infection may concur to the development of CHD; high levels of anti- Hsp60 antibodies may constitute a marker and/or a con- comitant pathogenic factor of the disease.
文摘目的探讨地鳖纤溶活性蛋白(fibrinolytic protein from Eupolyphaga sinensis Walker,EFP)对H22荷瘤小鼠的抑瘤功效。方法采用水提取法对地鳖进行成分分离;皮下接种肿瘤细胞建立荷瘤小鼠动物模型;灌胃和皮下注射法观察EFP的抑瘤作用;ELISA法检测血清抗H22抗体水平;记录各组体重变化、脾脏和胸腺等免疫器官的器官系数,检测肝脏丙二醛(MDA)水平、肝脏超氧化物歧化酶(SOD)活性、肝脏谷丙转氨酶(GPT)和谷草转氨酶(GOT)以及血清谷丙转氨酶(GPT)活力等生理生化指标。结果EFP具有明显的抑瘤活性。经EFP灌胃和皮下注射后的荷瘤小鼠,与对照组荷瘤小鼠相比其胸腺指数、脾指数明显增加;抗H22抗体水平以及MDA、SOD、GPT、GOT活性明显增加;肿瘤生长缓慢。结论EFP是地鳖抗肿瘤作用的主要有效成分,EFP在动物体内具有抗肿瘤作用,能通过增强荷瘤小鼠参与免疫抗体以及相关酶的活性而发挥抗肿瘤作用。
基金Supported by the National Natural Science Foundation of China, No. 30340036 and No. 30470891 Grant from Jiangsu University and Zhenjiang Key Institute of Clinical Laboratory Medicine (SH2006066)
文摘AIM: To explore the mechanism by which H pylori causes activation of gastric epithelial cells. METHODS: A VacA (+) and CagA (+) standard H pylori line NCTC 11637 and a human gastric adenocarcinoma derived gastric epithelial cell line BGC-823 were applied in the study. MTT assay and 3H-TdR incorporation test were used to detect the proliferation of BGC-823 cells and Western blotting was used to detect the activity and existence of related proteins. RESULTS: Incubation with H pylori extract increased the proliferation of gastric epithelial cells, reflected by both live cell number and DNA synthesis rate. The activity of extracellular signal-regulated protein kinase (ERK) signal transduction cascade increased within 20 min after in- cubation with H pylori extract and appeared to be a sus- tained event. MAPK/ERK kinase (MEK) inhibitor PD98059 abolished the action of H pylori extract on both ERK activity and cell proliferation. Incubation with H pylori extract increased c-Fos expression and SRE-dependent gene expression. H pylori extract caused phosphorylation of several proteins including a protein with molecular size of 97.4 kDa and tyrosine kinase inhibitor genistein inhibited the activation of ERK and the proliferation of cells caused by H pylori extract. CONCLUSION: Biologically active elements in H pylori extract cause proliferation of gastric epithelial cells through activating tyrosine kinase and ERK signal trans- duction cascade.
文摘Background:Angiogenesis is described as a complex process in which new microvessels sprout from endothelial cells of existing vasculature.This study aimed to determine whether long non-coding RNA(lncRNA)H19 induced the angiogenesis of gastric cancer(GC)and its possible mechanism.Methods:Gene expression level was determined by quantitative real-time polymerase chain reaction and western blotting.Cell counting kit-8,transwell,5-Ethynyl-2′-deoxyuridine(EdU),colony formation assay,and human umbilical vein endothelial cells(HUVECs)angiogenesis assay as well as Matrigel plug assay were conducted to study the proliferation,migration,and angiogenesis of GC in vitro and in vivo.The binding protein of H19 was found by RNA pull-down and RNA Immunoprecipitation(RIP).High-throughput sequencing was performed and next Gene Ontology(GO)as well as Kyoto Encyclopedia of Genes and Genomes(KEGG)analysis was conducted to analyze the genes that are under H19 regulation.Methylated RIP(me-RIP)assay was used to investigate the sites and abundance among target mRNA.The transcription factor acted as upstream of H19 was determined through chromatin immunoprecipitation(ChIP)and luciferase assay.Results:In this study,we found that hypoxia-induced factor(HIF)-1a could bind to the promoter region of H19,leading to H19 overexpression.High expression of H19 was correlated with angiogenesis in GC,and H19 knocking down could inhibit cell proliferation,migration and angiogenesis.Mechanistically,the oncogenic role of H19 was achieved by binding with the N^(6)-methyladenosine(m^(6)A)reader YTH domain-containing family protein 1(YTHDF1),which could recognize the m^(6)A site on the 3′-untransated regions(3′-UTR)of scavenger receptor class B member 1(SCARB1)mRNA,resulting in over-translation of SCARB1 and thus promoting the proliferation,migration,and angiogenesis of GC cells.Conclusion:HIF-1a induced overexpression of H19 via binding with the promoter of H19,and H19 promoted GC cells proliferation,migration and angiogenesis through YTHDF1/SCARB1,w
