An open reading frame (lcn61) of lymphocystis disease virus China (LCDV-cn), probably responsible for encoding putative zinc-finger proteins was amplified and inserted into pET24a (+) vector. Then it expressed in E. c...An open reading frame (lcn61) of lymphocystis disease virus China (LCDV-cn), probably responsible for encoding putative zinc-finger proteins was amplified and inserted into pET24a (+) vector. Then it expressed in E. coli BL21 (DE3), and His-tag fusion protein of high yield was obtained. It was found that the fusion protein existed in E. coli mainly as inclusion bodies. The bioinformatics analysis indicates that LCN61 is C2H2 type zinc-finger protein containing four C2H2 zinc-finger motifs. This work provides a theory for functional research of lcn61 gene.展开更多
AIM: To produce a recombinant protein rMBP-NAP, which was fusionally expressed by Helicobacter pylori(H pylori)neutrophil-activating protein (NAP) and E. coli maltosebinding protein (MBP) and to evaluate its immunorea...AIM: To produce a recombinant protein rMBP-NAP, which was fusionally expressed by Helicobacter pylori(H pylori)neutrophil-activating protein (NAP) and E. coli maltosebinding protein (MBP) and to evaluate its immunoreactivity and immunogenicity.METHODS: Neutrophil-activating protein gene of H pylori (HP-napA) was subcloned from the recombinant plasmid pNEB-napA, and fused to MalE gene of expressing vector pMAL-c2x. The recombinant plasmid pMAL-c2x-napA was confirmed by restriction enzyme digestion, and then transformed into E. coli TB1. Fusion protein rMBP-NAP was induced by IPTG and identified by SDS-PAGE analysis.Soluble rMBP-NAP was purified by amylose affinity chromatography. Immunoreactivity and immunogenicity of the fusion protein were evaluated by animal experiment,Western blotting with human H pylori anti-sera.RESULTS: E.coli TB1 carrying recombinant plasmid pMAL-c2x-napA was constructed and led to a high efficiency cytosol expression of fusion protein rBMP -NAP when induced by IPTG.The molecular weight of rBMP-NAP was about 57 kD,accounting for 37.55% of the total protein in the sonicated supematant of E. coli TB1 (pMAL-c2x-napA). The purity of the fusion protein after one-step affinity chromatography was 94% and the yield was 100 mg per liter of bacterial culture.The purified fusion protein could be specifically recognized by both human anti-sera from clinical patients with H pylori infection and rabbit sera immunized by rMBP-NAP itself.CONCLUSION: Recombinant protein rMBP-NAP might be a novel antigen for vaccine development against H pylori.展开更多
A number of disorders have been described to cause protein losing enteropathy (PLE) in children. Primary intestinal lymphangiectasia (PIL) is one mechanism leading to PLE. Few syndromes are associated with PIL; Hennek...A number of disorders have been described to cause protein losing enteropathy (PLE) in children. Primary intestinal lymphangiectasia (PIL) is one mechanism leading to PLE. Few syndromes are associated with PIL; Hennekam syndrome (HS) is one of them. The principal treatment for PIL is a high protein, low fat diet with medium chain triglycerides supplementation. Supportive therapy includes albumin infusion. Few publications have supported the use of octreotide to diminish protein loss and minimize hypoalbuminemia seen in PIL. There are no publications on the treatment of PIL with octreotide in patients with HS. We report two children with HS and PLE in which we used octreotide to decrease intestinal protein loss. In one patient, octreotide increased serum albumin to an acceptable level without further need for albumin infusions. The other patient responded more dramatically with near normal serum albumin levels and cessation of albumin infusions. In achieving a good response to octreotide in both patients, we add to the publications supporting the use of octreotide in PIL and suggest that octreotide should be tried in patients with PIL secondary to HS. To the best of our knowledge, this is the first case report on the use of octreotide in HS-associated PIL.展开更多
Nestin is a class Ⅵ intermediate filament protein that was originally described as a neuronal stem cell marker during central nervous system (CNS) development, and is currently widely used in that capacity. Nestin is...Nestin is a class Ⅵ intermediate filament protein that was originally described as a neuronal stem cell marker during central nervous system (CNS) development, and is currently widely used in that capacity. Nestin is also expressed in non-neuronal immature or progenitor cells in normal tissues. Under pathological conditions, nestin is expressed in repair processes in the CNS, muscle, liver, and infarcted myocardium. Furthermore, increased nestin expression has been reported in various tumor cells, including CNS tumors, gastrointestinal stromal tumors, pancreatic cancer, prostate cancer, breast cancer, malignant melanoma, dermatofibrosarcoma protuberances, and thyroid tumors. Nestin is reported to correlate with aggressive growth, metastasis, and poor prognosis in some tumors; however, the roles of nestin in cancer cells have not been well characterized. Furthermore, nestin is more specifically expressed in proliferating small-sized tumor vessels in glioblastoma and gastric, colorectal, and prostate cancers than are other tumor vessel markers. These findings indicate that nestin may be a marker for newly synthesized tumor vessels and a therapeutic target for tumor angiogenesis. It has received a lot of attention recently as a cancer stem cell marker in various cancer cells including brain tumors, malignant rhabdoid tumors, and uterine, cervical, prostate, bladder, head and neck, ovarian, testicular, and pancreatic cancers. The purpose of this review is to clarify the roles of nestin in cancer cells and in tumor angiogenesis, and to examine the association between nestin and cancer stem cells. Nestin has the potential to serve as a molecular target for cancers with nestin-positive cancer cells and nestin-positive tumor vasculature.展开更多
Dear Editor,Astrovirus is an enteric virus associated with sporadic diarrhea or large outbreaks of gastroenteritis（Mendez et al.,2013）.Until 2008,human astroviruses（HAst Vs）were classified into eight serotypes—HA...Dear Editor,Astrovirus is an enteric virus associated with sporadic diarrhea or large outbreaks of gastroenteritis（Mendez et al.,2013）.Until 2008,human astroviruses（HAst Vs）were classified into eight serotypes—HAstV-1 to HAstV-8—based on the reactivity of their capsid protein with type-specific antibodies.Among these serotypes,HAstV-1is the most prevalent globally.However,some divergent new astroviruses（MLB1/MLB2,VA1/VA2/VA3,展开更多
文摘【目的】在分子层面上研究家蚕微孢子虫Nosema bombycis与家蚕Bombyx mori蛋白的相互作用,初步探讨家蚕微孢子虫向家蚕细胞能量中心靠近的原因。【方法】采用Far-western blot分析与家蚕微孢子虫具有相互作用的家蚕中肠蛋白,质谱鉴定筛选出候选蛋白。PCR扩增候选蛋白的基因,连接到p ET30a载体并转入大肠杆菌Escherichia coli DH5α感受态细胞培养,测序选取正确的3个重组质粒,转化到大肠杆菌E.coli BL21感受态细胞中诱导表达候选蛋白,亲和层析柱纯化候选蛋白,制备多克隆抗体。用免疫共沉淀和间接免疫荧光技术验证候选蛋白与家蚕微孢子虫的相互作用。【结果】Far-western blot筛选到的anti-SWP9和anti-SWP5抗体与感染家蚕微孢子虫的家蚕中肠总蛋白的PVDF膜孵育,分别在26 k D和34 k D处检测到一条特异条带,说明家蚕微孢子虫与26 k D和34 k D的家蚕中肠蛋白发生了相互作用。对质谱鉴定结果进行蛋白质的分子量、肽段数以及功能的分析,筛选出与家蚕微孢子虫相互作用的候选家蚕蛋白烯酰辅酶A水合酶(ECH1)、甘油醛-3-磷酸脱氢酶(GAPDH)和3-羟酰辅酶A脱氢酶(HCDH)。利用制备的能够特异识别ECH1,GAPDH和HCDH 3种蛋白的多克隆抗体anti-ECH1,anti-GAPDH和anti-HCDH进行免疫共沉淀,证实了家蚕微孢子虫与家蚕中肠蛋白ECH1和GAPDH具有相互作用;间接免疫荧光分析结果进一步说明GAPDH能与家蚕微孢子虫特异性结合。【结论】家蚕微孢子虫可以和家蚕蛋白ECH1和GAPDH特异性结合。由于ECH1是定位于线粒体膜上的脂肪酸β-氧化的关键酶,GAPDH是糖酵解途径的关键酶,推测家蚕微孢子虫可能通过和家蚕ECH1和GAPDH的相互作用,在空间上靠近宿主细胞的线粒体和糖酵解途径,便于摄取宿主细胞脂肪酸β-氧化和糖酵解途径产生的中间产物和ATP,满足家蚕微孢子虫的物质和能量需求。
基金Supported by High Technology Research and Development Program of China (863 Program, No. 2006AA100309)
文摘An open reading frame (lcn61) of lymphocystis disease virus China (LCDV-cn), probably responsible for encoding putative zinc-finger proteins was amplified and inserted into pET24a (+) vector. Then it expressed in E. coli BL21 (DE3), and His-tag fusion protein of high yield was obtained. It was found that the fusion protein existed in E. coli mainly as inclusion bodies. The bioinformatics analysis indicates that LCN61 is C2H2 type zinc-finger protein containing four C2H2 zinc-finger motifs. This work provides a theory for functional research of lcn61 gene.
基金Supported by the Medical Science Foundation for Distinguished Scholars of Henan Province, No. 200084
文摘AIM: To produce a recombinant protein rMBP-NAP, which was fusionally expressed by Helicobacter pylori(H pylori)neutrophil-activating protein (NAP) and E. coli maltosebinding protein (MBP) and to evaluate its immunoreactivity and immunogenicity.METHODS: Neutrophil-activating protein gene of H pylori (HP-napA) was subcloned from the recombinant plasmid pNEB-napA, and fused to MalE gene of expressing vector pMAL-c2x. The recombinant plasmid pMAL-c2x-napA was confirmed by restriction enzyme digestion, and then transformed into E. coli TB1. Fusion protein rMBP-NAP was induced by IPTG and identified by SDS-PAGE analysis.Soluble rMBP-NAP was purified by amylose affinity chromatography. Immunoreactivity and immunogenicity of the fusion protein were evaluated by animal experiment,Western blotting with human H pylori anti-sera.RESULTS: E.coli TB1 carrying recombinant plasmid pMAL-c2x-napA was constructed and led to a high efficiency cytosol expression of fusion protein rBMP -NAP when induced by IPTG.The molecular weight of rBMP-NAP was about 57 kD,accounting for 37.55% of the total protein in the sonicated supematant of E. coli TB1 (pMAL-c2x-napA). The purity of the fusion protein after one-step affinity chromatography was 94% and the yield was 100 mg per liter of bacterial culture.The purified fusion protein could be specifically recognized by both human anti-sera from clinical patients with H pylori infection and rabbit sera immunized by rMBP-NAP itself.CONCLUSION: Recombinant protein rMBP-NAP might be a novel antigen for vaccine development against H pylori.
文摘A number of disorders have been described to cause protein losing enteropathy (PLE) in children. Primary intestinal lymphangiectasia (PIL) is one mechanism leading to PLE. Few syndromes are associated with PIL; Hennekam syndrome (HS) is one of them. The principal treatment for PIL is a high protein, low fat diet with medium chain triglycerides supplementation. Supportive therapy includes albumin infusion. Few publications have supported the use of octreotide to diminish protein loss and minimize hypoalbuminemia seen in PIL. There are no publications on the treatment of PIL with octreotide in patients with HS. We report two children with HS and PLE in which we used octreotide to decrease intestinal protein loss. In one patient, octreotide increased serum albumin to an acceptable level without further need for albumin infusions. The other patient responded more dramatically with near normal serum albumin levels and cessation of albumin infusions. In achieving a good response to octreotide in both patients, we add to the publications supporting the use of octreotide in PIL and suggest that octreotide should be tried in patients with PIL secondary to HS. To the best of our knowledge, this is the first case report on the use of octreotide in HS-associated PIL.
基金Supported by Grants (No. S0801035, to Naito Z) from the Ministry of Education, Culture, Sports, Science, and Technol-ogy (MEXT), JapanGrant-in-Aid for Young Scientists (A, No. 22689038 to Matsuda Y)
文摘Nestin is a class Ⅵ intermediate filament protein that was originally described as a neuronal stem cell marker during central nervous system (CNS) development, and is currently widely used in that capacity. Nestin is also expressed in non-neuronal immature or progenitor cells in normal tissues. Under pathological conditions, nestin is expressed in repair processes in the CNS, muscle, liver, and infarcted myocardium. Furthermore, increased nestin expression has been reported in various tumor cells, including CNS tumors, gastrointestinal stromal tumors, pancreatic cancer, prostate cancer, breast cancer, malignant melanoma, dermatofibrosarcoma protuberances, and thyroid tumors. Nestin is reported to correlate with aggressive growth, metastasis, and poor prognosis in some tumors; however, the roles of nestin in cancer cells have not been well characterized. Furthermore, nestin is more specifically expressed in proliferating small-sized tumor vessels in glioblastoma and gastric, colorectal, and prostate cancers than are other tumor vessel markers. These findings indicate that nestin may be a marker for newly synthesized tumor vessels and a therapeutic target for tumor angiogenesis. It has received a lot of attention recently as a cancer stem cell marker in various cancer cells including brain tumors, malignant rhabdoid tumors, and uterine, cervical, prostate, bladder, head and neck, ovarian, testicular, and pancreatic cancers. The purpose of this review is to clarify the roles of nestin in cancer cells and in tumor angiogenesis, and to examine the association between nestin and cancer stem cells. Nestin has the potential to serve as a molecular target for cancers with nestin-positive cancer cells and nestin-positive tumor vasculature.
基金supported by the National Nature Science Foundation of China(No.81201285)Dr.Start-up Fund of Liaoning Province(No.20141134)+2 种基金excellent talents project in colleges and universities of the Liaoning Province Foundation(No.LJQ2015067)college students of science and technology innovation fund,Liaoning medical university principal fund(No.2014D09)approved by the ethics committees of Liao Yi[2014](NO.6-20150005)
文摘Dear Editor,Astrovirus is an enteric virus associated with sporadic diarrhea or large outbreaks of gastroenteritis（Mendez et al.,2013）.Until 2008,human astroviruses（HAst Vs）were classified into eight serotypes—HAstV-1 to HAstV-8—based on the reactivity of their capsid protein with type-specific antibodies.Among these serotypes,HAstV-1is the most prevalent globally.However,some divergent new astroviruses（MLB1/MLB2,VA1/VA2/VA3,
