Human interferon-αlc/86D (IFNαlc/86D) was functionally displayed on the surface of the filamentous bacteriophage using a phagemid vector system (pCANTAB5E). The key amino acid residues involved in the receptor bindi...Human interferon-αlc/86D (IFNαlc/86D) was functionally displayed on the surface of the filamentous bacteriophage using a phagemid vector system (pCANTAB5E). The key amino acid residues involved in the receptor binding were further defined with phage displayed 6-mer peptide library and two neutralizing antibodies against linear epitopes on the IFN-αlb, indicating that residues 30, 33, 34, (Mi-loop) and residues 124, 126, 127 (D helix, DE-loop) were more critical than the adjacent residues for recognition of receptor. In addition, a cassette mutagenesis library was generated by fully randomizing the sequence of the four positions 29, 31, 32 and 35 in AB-loop, and used to select phage-IFN variants with WISH-based panning method. Three phage-IFN variants were isolated to possess more antiviral activity in the range of 4-16-fold than parental phage-IFN after IPTG-induced soluble expression. The results suggest that phage displayed phage-IFN αlc/86D variants with increased specific activity might be obtained after purification procedures.展开更多
This paper presents the results of studying the frequency dependence of permittivity and dielectric loss of fishbone (Fb) Kutum and polyethylene composites filled with nanoparticles fishbone Kutum and the influence of...This paper presents the results of studying the frequency dependence of permittivity and dielectric loss of fishbone (Fb) Kutum and polyethylene composites filled with nanoparticles fishbone Kutum and the influence of aluminum(Al) nanoparticles with dimensions 80-nm on the dielectric properties of polymer composites. Studies were carried out at the frequency range of 0 - 1 MHz. It was found that the variation of the volume of filler content of fishbone and aluminum nanoparticles might be prepared composite materials with the required dielectric parameters.展开更多
Objective： To explore differences in bone marrow angiogenesis seen in aplastic anemia （AA） patients presenting with differential Chinese medicine （CM） syndrome, and to correlate these differences with clinical pa...Objective： To explore differences in bone marrow angiogenesis seen in aplastic anemia （AA） patients presenting with differential Chinese medicine （CM） syndrome, and to correlate these differences with clinical pathology. Methods： Thirty-five patients were enrolled, including 18 with ＂yang deficiency syndrome＂ and 17 with ＂yin deficiency syndrome.＂ Bone marrow biopsies and serum were collected. Microvessel density （MVD） and positive expression of vascular endothelial-derived growth factor （VEGF） were detected by immunohistochemisty. Hypoxia inducible factor -α （HIF-α ）, and VEGF expression were assayed by enzyme-linked immunoabsorbent assay （ELISA）, serum lactate dehydrogenase （LDH） was tested by enzyme method and liquid chip technology was used to detected the expression of interleukin （IL）-2, IL-4, IL-6, IL-10, interferon （IFN）-＇y and tumor necrosis factor （TNF）-α. Results： Counts for leukocytes, absolute neutrophils and platelets in ＂yin deficiency syndrome＂ were lower than those found in ＂yang deficiency syndrome＂ （P〈0.05）. MVD and VEGF expression, and the positive rate of CD34 and VEGF in bone marrow were lower in hA, especially in ＂yin deficiency syndrome＂ （P〈0.01 or P〈0.05）. ＂Yin deficiency syndrome＂ displayed decreased VEGF and LDH expression, and enhanced expression of HIF-α as compared to ＂yang deficiency syndrome＂ （P〈0.05）. Levels of IL-4 and IL-6 were higher in AA （P〈0.01）, but IL-10 was decreased （P〈0.05）. High TNF-c~ expression was seen in ＂yang deficiency syndrome＂ and IFN- γ expression was decreased in ＂yin deficiency syndrome＂ as compared with normals （P〈0.01 and P〈0.05, respectively）. Conclusion： AA patients have lower MVD than normals, especially in ＂yin deficiency syndrome.＂ MVD might differentially correlate to disease severity, and could be dependent on bone marrow or serum VEGF expression and LDH. Additionally, IL-2, IL-10, IL-4 and IFN- γ were negatively as展开更多
基金Project supported by the China National Expert Committee for Biotechnology Development.
文摘Human interferon-αlc/86D (IFNαlc/86D) was functionally displayed on the surface of the filamentous bacteriophage using a phagemid vector system (pCANTAB5E). The key amino acid residues involved in the receptor binding were further defined with phage displayed 6-mer peptide library and two neutralizing antibodies against linear epitopes on the IFN-αlb, indicating that residues 30, 33, 34, (Mi-loop) and residues 124, 126, 127 (D helix, DE-loop) were more critical than the adjacent residues for recognition of receptor. In addition, a cassette mutagenesis library was generated by fully randomizing the sequence of the four positions 29, 31, 32 and 35 in AB-loop, and used to select phage-IFN variants with WISH-based panning method. Three phage-IFN variants were isolated to possess more antiviral activity in the range of 4-16-fold than parental phage-IFN after IPTG-induced soluble expression. The results suggest that phage displayed phage-IFN αlc/86D variants with increased specific activity might be obtained after purification procedures.
文摘This paper presents the results of studying the frequency dependence of permittivity and dielectric loss of fishbone (Fb) Kutum and polyethylene composites filled with nanoparticles fishbone Kutum and the influence of aluminum(Al) nanoparticles with dimensions 80-nm on the dielectric properties of polymer composites. Studies were carried out at the frequency range of 0 - 1 MHz. It was found that the variation of the volume of filler content of fishbone and aluminum nanoparticles might be prepared composite materials with the required dielectric parameters.
基金Supported by Special Item of Important Disease of Zhejiang Province Traditional Chinese Medicine Sic-Tech Innovation Platform(No.2009ZDJB01)2011 Special Research Funds for Traditional Chinese Medicine Industry(No.201107001)+2 种基金Subject of Key Sic-Tech Innovation Team of Zhejiang Province(No.2011R09042-02)Program of Science and Technology Department of Zhejiang Province(No.2006C23039)Zhejiang Provincial Traditional Chinese Medicine AdministrationBureau Program(No.2007GA004)
文摘Objective： To explore differences in bone marrow angiogenesis seen in aplastic anemia （AA） patients presenting with differential Chinese medicine （CM） syndrome, and to correlate these differences with clinical pathology. Methods： Thirty-five patients were enrolled, including 18 with ＂yang deficiency syndrome＂ and 17 with ＂yin deficiency syndrome.＂ Bone marrow biopsies and serum were collected. Microvessel density （MVD） and positive expression of vascular endothelial-derived growth factor （VEGF） were detected by immunohistochemisty. Hypoxia inducible factor -α （HIF-α ）, and VEGF expression were assayed by enzyme-linked immunoabsorbent assay （ELISA）, serum lactate dehydrogenase （LDH） was tested by enzyme method and liquid chip technology was used to detected the expression of interleukin （IL）-2, IL-4, IL-6, IL-10, interferon （IFN）-＇y and tumor necrosis factor （TNF）-α. Results： Counts for leukocytes, absolute neutrophils and platelets in ＂yin deficiency syndrome＂ were lower than those found in ＂yang deficiency syndrome＂ （P〈0.05）. MVD and VEGF expression, and the positive rate of CD34 and VEGF in bone marrow were lower in hA, especially in ＂yin deficiency syndrome＂ （P〈0.01 or P〈0.05）. ＂Yin deficiency syndrome＂ displayed decreased VEGF and LDH expression, and enhanced expression of HIF-α as compared to ＂yang deficiency syndrome＂ （P〈0.05）. Levels of IL-4 and IL-6 were higher in AA （P〈0.01）, but IL-10 was decreased （P〈0.05）. High TNF-c~ expression was seen in ＂yang deficiency syndrome＂ and IFN- γ expression was decreased in ＂yin deficiency syndrome＂ as compared with normals （P〈0.01 and P〈0.05, respectively）. Conclusion： AA patients have lower MVD than normals, especially in ＂yin deficiency syndrome.＂ MVD might differentially correlate to disease severity, and could be dependent on bone marrow or serum VEGF expression and LDH. Additionally, IL-2, IL-10, IL-4 and IFN- γ were negatively as
