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hepatitis b/batata
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Polypeptides of hepatitis B surface antigen produced in transgenic potato.
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Chimeric genes containing the genomic fragments of hepatitis B virus (HBV) coding for middle (M) and major/small (S) surface proteins were constructed and expressed in transgenic potato plants under the control of the cauliflower mosaic virus 35S promoter. Enzyme-linked immunosorbent assay (ELISA)
Antibody responses in mice stimulated by various doses of the potato-derived major surface antigen of hepatitis B virus.
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The ability of potato-derived major surface antigen of hepatitis B virus (P-HBsAg) to elicit antibody responses to different dosages of P-HBsAg ranging from 0.02 to 30 μg administered orally in mice was examined. All immunized groups produced specific serum IgG and fecal IgA antibodies against
Expression and characterization of hepatitis B surface antigen in transgenic potato plants.
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Transgenic potato plants expressing the gene of hepatitis B surface antigen (HBsAg) under the control of the double promoter of 35S RNA of cauliflower mosaic virus (CaMV 35SS) and the promoter of patatin gene of potato tubers have been obtained. Biochemical analysis of the plants was performed. The
Process options in hepatitis B surface antigen extraction from transgenic potato.
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The process conditions for recombinant hepatitis B surface antigen (HBsAg) extraction from transgenic potato were examined. The effects of temperature, the reducing agent beta-mercaptoethanol (BME), and proteinase inhibitors on the level of antigenic activity of recovered HBsAg were determined.
Study of the immunogenicity of hepatitis B surface antigen synthesized in transgenic potato plants with increased biosafety.
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Oral immunogenicity of the hepatitis B surface antigen (HBsAg) synthesized in the tubers of marker-free potato plants has been demonstrated. Experiments were performed in the two groups of outbred NMRI mice. At the beginning of investigations, the mice of experimental group were fed the tubers of
Expression of the hepatitis B surface S and preS2 antigens in tubers of Solanum tuberosum.
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In an attempt to develop an edible vaccine, we transformed a recombinant hepatitis B virus (HBV) gene encoding the middle protein of HBV that contains the surface S and preS2 antigen into potato by Agrobacterium-mediated transformation. The HBV gene was under control of either the CaMV 35S promoter,
Immunogenicity of biologically safe potato tubers synthesizing hepatitis B surface antigen.
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Structural characterization of plant-derived hepatitis B surface antigen employed in oral immunization studies.
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Several subunit vaccine antigens have been successfully expressed in plants and recently the hepatitis B surface antigen (HBsAg), expressed in potatoes, was shown to be orally immunogenic in animal studies. However, to date, a detailed analysis of the plant-derived antigen is lacking. Herein, we
Overview of expression of hepatitis B surface antigen in transgenic plants.
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Hepatitis B virus (HBV), a pathogen for chronic liver infection, afflicts more than 350 million people world-wide. The effective way to control the virus is to take HBV vaccine. Hepatitis B surface antigen (HBsAg) is an effective protective antigen suitable for vaccine development. At present,
Expression and characterization of an anti-(hepatitis B surface antigen) glycosylated mouse antibody in transgenic tobacco (Nicotiana tabacum) plants and its use in the immunopurification of its target antigen.
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Transgenic plants expressing recombinant immunoglobulins have arisen as an alternative technology for the large-scale production of antibodies useful in therapeutics and in industrial processes. In the present paper we report the expression in transgenic tobacco ( Nicotiana tabacum ) of an
Virus-like particle expression and assembly in plants: hepatitis B and Norwalk viruses.
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Expression of vaccine antigens in plants and delivery via ingestion of transgenic plant material has shown promise in numerous pre-clinical animal studies and in a few clinical trials. A number of different viral antigens have been tested, and among the most promising are those that can assemble
Oral immunogenicity of potato-derived HBsAg middle protein in BALB/c mice.
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The antibodies to preS2 synthetic peptides have been probed to neutralize hepatitis B virus (HBV), and also the addition of preS2 sequence could enhance the antibody response compared with a conventional vaccine in the non- and low responders. Previously, we generated transgenic potatoes expressing
Immunogenicity in humans of an edible vaccine for hepatitis B.
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A double-blind placebo-controlled clinical trial evaluated the immunogenicity of hepatitis B surface antigen (HBsAg) expressed in potatoes and delivered orally to previously vaccinated individuals. The potatoes accumulated HBsAg at approximately 8.5 microg/g of potato tuber, and doses of 100 g of
Production of hepatitis B surface antigen in transgenic plants for oral immunization.
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Here we present data showing oral immunogenicity of recombinant hepatitis B surface antigen (HBsAg) in preclinical animal trials. Mice fed transgenic HBsAg potato tubers showed a primary immune response (increases in HBsAg-specific serum antibody) that could be greatly boosted by intraperitoneal
Efficient Transient Expression of Recombinant Proteins in Plants by the Novel pEff Vector Based on the Genome of Potato Virus X.
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Agroinfiltration of plant leaves with binary vectors carrying a gene of interest within a plant viral vector is a rapid and efficient method for protein production in plants. Previously, we constructed a self-replicating vector, pA7248AMV, based on the genetic elements of potato virus X (PVX), and
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