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Phan HT, Tran HX, Ho TT, Pham VT, Trinh VT, Nguyen TT, Pham NB, Chu HH, Conrad U. Plant crude extracts containing oligomeric hemagglutinins protect chickens against highly Pathogenic Avian Influenza Virus after one dose of immunization. Vet Res Commun 2023; 47:191-205. [PMID: 35633471 PMCID: PMC9145123 DOI: 10.1007/s11259-022-09942-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 05/18/2022] [Indexed: 01/27/2023]
Abstract
Highly pathogenic avian influenza viruses (HPAIV) have been responsible for causing several severe outbreaks across the world. To protect poultry farms and to prevent the possible spread of new influenza pandemics, vaccines that are both efficacious and low-cost are in high demand. We produced stable, large hemagglutinin H5 oligomers in planta by the specific interaction between S•Tag and S•Protein. H5 oligomers combined via S•Tag::S•Protein interaction in plant crude extracts induced strong humoral immune responses, strong neutralizing antibody responses, and resistance in chickens after challenge with a wild type HPAIV H5 virus strain. In all three parameters, plant crude extracts with H5 oligomers induced better responses than crude extracts containing trimers. The neutralizing antibodies induced by by two-dose and one dose immunization with an adjuvanted crude extract containing H5 oligomer protected vaccinated chickens from two lethal H5N1 virus strains with the efficiency of 92% and 100%, respectively. Following housing vaccinated chickens together with ten non-immunized chickens, only one of these chickens had detectable levels of the H5N1 virus. To facilitate the easy storage of a candidate vaccine, the H5 oligomer crude extracts were mixed with adjuvants and stored for 3.5 and 5.5 months at 4 °C, and chickens were immunized with these crude extracts. All these vaccinated chickens survived after a lethal H5N1 virus challenge. H5 oligomer crude extracts are comparable to commercial vaccines as they also induce strong virus-neutralizing immune responses following the administration of a single dose. The cost-effective production of plant crude extract vaccine candidates and the high stability after long-term storage will enable and encourage the further exploration of this technology for veterinary vaccine development.
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Affiliation(s)
- Hoang Trong Phan
- grid.418934.30000 0001 0943 9907Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany
| | - Hanh Xuan Tran
- JSC Central Veterinary NAVETCO, 29A Nguyen Dinh Chieu, 1 District, Ho Chi Minh, Vietnam
| | - Thuong Thi Ho
- grid.267849.60000 0001 2105 6888Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam ,grid.267849.60000 0001 2105 6888Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam
| | - Van Thi Pham
- grid.267849.60000 0001 2105 6888Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam ,grid.267849.60000 0001 2105 6888Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam
| | - Vy Thai Trinh
- grid.267849.60000 0001 2105 6888Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam ,grid.267849.60000 0001 2105 6888Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam
| | - Tra Thi Nguyen
- grid.267849.60000 0001 2105 6888Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam ,grid.267849.60000 0001 2105 6888Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam
| | - Ngoc Bich Pham
- grid.267849.60000 0001 2105 6888Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam ,grid.267849.60000 0001 2105 6888Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam
| | - Ha Hoang Chu
- grid.267849.60000 0001 2105 6888Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam ,grid.267849.60000 0001 2105 6888Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam
| | - Udo Conrad
- grid.418934.30000 0001 0943 9907Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany
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Ho TT, Pham VT, Nguyen TT, Trinh VT, Vi T, Lin HH, Nguyen PMT, Bui HT, Pham NB, Le TBT, Phan CV, Chang HC, Hsiao WWW, Chu HH, Pham MD. Effects of Size and Surface Properties of Nanodiamonds on the Immunogenicity of Plant-Based H5 Protein of A/H5N1 Virus in Mice. Nanomaterials (Basel) 2021; 11:nano11061597. [PMID: 34204514 PMCID: PMC8234943 DOI: 10.3390/nano11061597] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 06/04/2021] [Accepted: 06/15/2021] [Indexed: 12/18/2022]
Abstract
Nanodiamond (ND) has recently emerged as a potential nanomaterial for nanovaccine development. Here, a plant-based haemagglutinin protein (H5.c2) of A/H5N1 virus was conjugated with detonation NDs (DND) of 3.7 nm in diameter (ND4), and high-pressure and high-temperature (HPHT) oxidative NDs of ~40-70 nm (ND40) and ~100-250 nm (ND100) in diameter. Our results revealed that the surface charge, but not the size of NDs, is crucial to the protein conjugation, as well as the in vitro and in vivo behaviors of H5.c2:ND conjugates. Positively charged ND4 does not effectively form stable conjugates with H5.c2, and has no impact on the immunogenicity of the protein both in vitro and in vivo. In contrast, the negatively oxidized NDs (ND40 and ND100) are excellent protein antigen carriers. When compared to free H5.c2, H5.c2:ND40, and H5.c2:ND100 conjugates are highly immunogenic with hemagglutination titers that are both 16 times higher than that of the free H5.c2 protein. Notably, H5.c2:ND40 and H5.c2:ND100 conjugates induce over 3-folds stronger production of both H5.c2-specific-IgG and neutralizing antibodies against A/H5N1 than free H5.c2 in mice. These findings support the innovative strategy of using negatively oxidized ND particles as novel antigen carriers for vaccine development, while also highlighting the importance of particle characterization before use.
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Affiliation(s)
- Thuong Thi Ho
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam; (T.T.H.); (V.T.P.); (T.T.N.); (V.T.T.); (T.V.); (P.M.T.N.); (H.T.B.); (N.B.P.); (T.B.T.L.); (C.V.P.)
- Faculty of Biotechnology, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam
| | - Van Thi Pham
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam; (T.T.H.); (V.T.P.); (T.T.N.); (V.T.T.); (T.V.); (P.M.T.N.); (H.T.B.); (N.B.P.); (T.B.T.L.); (C.V.P.)
- Faculty of Biotechnology, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam
| | - Tra Thi Nguyen
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam; (T.T.H.); (V.T.P.); (T.T.N.); (V.T.T.); (T.V.); (P.M.T.N.); (H.T.B.); (N.B.P.); (T.B.T.L.); (C.V.P.)
- Faculty of Biotechnology, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam
| | - Vy Thai Trinh
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam; (T.T.H.); (V.T.P.); (T.T.N.); (V.T.T.); (T.V.); (P.M.T.N.); (H.T.B.); (N.B.P.); (T.B.T.L.); (C.V.P.)
- Faculty of Biotechnology, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam
| | - Tram Vi
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam; (T.T.H.); (V.T.P.); (T.T.N.); (V.T.T.); (T.V.); (P.M.T.N.); (H.T.B.); (N.B.P.); (T.B.T.L.); (C.V.P.)
- Faculty of Medical Biotechnology—Plant Biotechnology—Pharmacology, University of Science and Technology of Hanoi (USTH), 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam
| | - Hsin-Hung Lin
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan; (H.-H.L.); (H.-C.C.)
| | - Phuong Minh Thi Nguyen
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam; (T.T.H.); (V.T.P.); (T.T.N.); (V.T.T.); (T.V.); (P.M.T.N.); (H.T.B.); (N.B.P.); (T.B.T.L.); (C.V.P.)
| | - Huyen Thi Bui
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam; (T.T.H.); (V.T.P.); (T.T.N.); (V.T.T.); (T.V.); (P.M.T.N.); (H.T.B.); (N.B.P.); (T.B.T.L.); (C.V.P.)
| | - Ngoc Bich Pham
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam; (T.T.H.); (V.T.P.); (T.T.N.); (V.T.T.); (T.V.); (P.M.T.N.); (H.T.B.); (N.B.P.); (T.B.T.L.); (C.V.P.)
- Faculty of Biotechnology, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam
| | - Thao Bich Thi Le
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam; (T.T.H.); (V.T.P.); (T.T.N.); (V.T.T.); (T.V.); (P.M.T.N.); (H.T.B.); (N.B.P.); (T.B.T.L.); (C.V.P.)
| | - Chi Van Phan
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam; (T.T.H.); (V.T.P.); (T.T.N.); (V.T.T.); (T.V.); (P.M.T.N.); (H.T.B.); (N.B.P.); (T.B.T.L.); (C.V.P.)
| | - Huan-Cheng Chang
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan; (H.-H.L.); (H.-C.C.)
| | - Wesley Wei-Wen Hsiao
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan;
| | - Ha Hoang Chu
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam; (T.T.H.); (V.T.P.); (T.T.N.); (V.T.T.); (T.V.); (P.M.T.N.); (H.T.B.); (N.B.P.); (T.B.T.L.); (C.V.P.)
- Faculty of Biotechnology, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam
- Correspondence: (H.H.C.); (M.D.P.)
| | - Minh Dinh Pham
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam; (T.T.H.); (V.T.P.); (T.T.N.); (V.T.T.); (T.V.); (P.M.T.N.); (H.T.B.); (N.B.P.); (T.B.T.L.); (C.V.P.)
- Faculty of Biotechnology, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam
- Correspondence: (H.H.C.); (M.D.P.)
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Cosset-Chéneau M, Vila L, Zahnd G, Gusakova D, Pham VT, Grèzes C, Waintal X, Marty A, Jaffrès H, Attané JP. Measurement of the Spin Absorption Anisotropy in Lateral Spin Valves. Phys Rev Lett 2021; 126:027201. [PMID: 33512209 DOI: 10.1103/physrevlett.126.027201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 11/20/2020] [Indexed: 06/12/2023]
Abstract
The spin absorption process in a ferromagnetic material depends on the spin orientation relative to the magnetization. Using a ferromagnet to absorb the pure spin current created within a lateral spin valve, we evidence and quantify a sizable orientation dependence of the spin absorption in Co, CoFe, and NiFe. These experiments allow us to determine the spin-mixing conductance, an elusive but fundamental parameter of the spin-dependent transport. We show that the obtained values cannot be understood within a model considering only the Larmor, transverse decoherence, and spin diffusion lengths, and rather suggest that the spin-mixing conductance is actually limited by the Sharvin conductance.
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Affiliation(s)
- M Cosset-Chéneau
- Université Grenoble Alpes, CEA, CNRS, INP-G, Spintec, F-38054 Grenoble, France
| | - L Vila
- Université Grenoble Alpes, CEA, CNRS, INP-G, Spintec, F-38054 Grenoble, France
| | - G Zahnd
- Université Grenoble Alpes, CEA, CNRS, INP-G, Spintec, F-38054 Grenoble, France
| | - D Gusakova
- Université Grenoble Alpes, CEA, CNRS, INP-G, Spintec, F-38054 Grenoble, France
| | - V T Pham
- Université Grenoble Alpes, CEA, CNRS, INP-G, Spintec, F-38054 Grenoble, France
| | - C Grèzes
- Université Grenoble Alpes, CEA, CNRS, INP-G, Spintec, F-38054 Grenoble, France
| | - X Waintal
- Université Grenoble Alpes, CEA, Pheliqs, F-38054 Grenoble, France
| | - A Marty
- Université Grenoble Alpes, CEA, CNRS, INP-G, Spintec, F-38054 Grenoble, France
| | - H Jaffrès
- Unité Mixte de Physique CNRS/Thales, University Paris-Sud and Université Paris-Saclay, 91767 Palaiseau, France
| | - J-P Attané
- Université Grenoble Alpes, CEA, CNRS, INP-G, Spintec, F-38054 Grenoble, France
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Phan HT, Pham VT, Ho TT, Pham NB, Chu HH, Vu TH, Abdelwhab EM, Scheibner D, Mettenleiter TC, Hanh TX, Meister A, Gresch U, Conrad U. Immunization with Plant-Derived Multimeric H5 Hemagglutinins Protect Chicken against Highly Pathogenic Avian Influenza Virus H5N1. Vaccines (Basel) 2020; 8:E593. [PMID: 33050224 PMCID: PMC7712794 DOI: 10.3390/vaccines8040593] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 10/02/2020] [Accepted: 10/05/2020] [Indexed: 12/26/2022] Open
Abstract
Since 2003, H5N1 highly pathogenic avian influenza viruses (HPAIV) have not only caused outbreaks in poultry but were also transmitted to humans with high mortality rates. Vaccination is an efficient and economical means of increasing immunity against infections to decrease the shedding of infectious agents in immunized animals and to reduce the probability of further infections. Subunit vaccines from plants are the focus of modern vaccine developments. In this study, plant-made hemagglutinin (H5) trimers were purified from transiently transformed N. benthamiana plants. All chickens immunized with purified H5 trimers were fully protected against the severe HPAIV H5N1 challenge. We further developed a proof-of-principle approach by using disulfide bonds, homoantiparallel peptides or homodimer proteins to combine H5 trimers leading to production of H5 oligomers. Mice vaccinated with crude leaf extracts containing H5 oligomers induced neutralizing antibodies better than those induced by crude leaf extracts containing trimers. As a major result, eleven out of twelve chickens (92%) immunized with adjuvanted H5 oligomer crude extracts were protected from lethal disease while nine out of twelve chickens (75%) vaccinated with adjuvanted H5 trimer crude extracts survived. The solid protective immune response achieved by immunization with crude extracts and the stability of the oligomers form the basis for the development of inexpensive protective veterinary vaccines.
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Affiliation(s)
- Hoang Trong Phan
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), D-06466 Seeland OT Gatersleben, Germany; (A.M.); (U.G.)
| | - Van Thi Pham
- Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi 100000, Vietnam; (V.T.P.); (T.T.H.); (N.B.P.); (H.H.C.); (T.H.V.)
- Faculty of Biotechnology, Graduate University of Science and Technology (GUST), VAST, Hanoi 10000, Vietnam
| | - Thuong Thi Ho
- Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi 100000, Vietnam; (V.T.P.); (T.T.H.); (N.B.P.); (H.H.C.); (T.H.V.)
| | - Ngoc Bich Pham
- Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi 100000, Vietnam; (V.T.P.); (T.T.H.); (N.B.P.); (H.H.C.); (T.H.V.)
- Faculty of Biotechnology, Graduate University of Science and Technology (GUST), VAST, Hanoi 10000, Vietnam
| | - Ha Hoang Chu
- Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi 100000, Vietnam; (V.T.P.); (T.T.H.); (N.B.P.); (H.H.C.); (T.H.V.)
- Faculty of Biotechnology, Graduate University of Science and Technology (GUST), VAST, Hanoi 10000, Vietnam
| | - Trang Huyen Vu
- Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi 100000, Vietnam; (V.T.P.); (T.T.H.); (N.B.P.); (H.H.C.); (T.H.V.)
- Faculty of Biotechnology, Graduate University of Science and Technology (GUST), VAST, Hanoi 10000, Vietnam
| | - Elsayed M. Abdelwhab
- Institute of Molecular Virology and Cell Biology, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, D-17493 Greifswald-Insel Riems, Germany; (E.M.A.); (D.S.); (T.C.M.)
| | - David Scheibner
- Institute of Molecular Virology and Cell Biology, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, D-17493 Greifswald-Insel Riems, Germany; (E.M.A.); (D.S.); (T.C.M.)
| | - Thomas C. Mettenleiter
- Institute of Molecular Virology and Cell Biology, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, D-17493 Greifswald-Insel Riems, Germany; (E.M.A.); (D.S.); (T.C.M.)
| | - Tran Xuan Hanh
- National Veterinary Joint Stock Company (NAVETCO), 29 Nguyen Dinh Chieu, Dist 1, Ho Chi Minh City 700000, Vietnam;
| | - Armin Meister
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), D-06466 Seeland OT Gatersleben, Germany; (A.M.); (U.G.)
| | - Ulrike Gresch
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), D-06466 Seeland OT Gatersleben, Germany; (A.M.); (U.G.)
| | - Udo Conrad
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), D-06466 Seeland OT Gatersleben, Germany; (A.M.); (U.G.)
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Abstract
The importance of the gut microbiota community on host's health and disease has long been recognised and is well documented. The development of pro- and prebiotic interventions offers an opportunity for the modulation of the gut microbiota towards long lasting health. In vitro fermentation models were developed as a powerful tool to study the impact of pro- and prebiotics on the gut microbiota under tightly controlled conditions, which allow dynamic sampling over time in reactors mimicking different colon regions. These models have been further evolved to suit specific experimental purposes, e.g. including immobilised faecal microbiota, peristaltic movement, mucin microcosm and the ability to perform treatments in parallel. In this review we discuss the advantages, disadvantages and technical considerations of the most frequently used models. We further focus on recent advances in the application of these models in prebiotics and probiotics research and outline their predictability for clinical research.
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Affiliation(s)
- V T Pham
- 1 DSM Nutritional Products Ltd., R&D Human Nutrition and Health, P.O. Box 2676, 4002 Basel, Switzerland
| | - M H Mohajeri
- 1 DSM Nutritional Products Ltd., R&D Human Nutrition and Health, P.O. Box 2676, 4002 Basel, Switzerland.,2 University of Zurich, Winterthurerstr. 190, 8057 Zürich, Switzerland
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Abstract
BACKGROUND/AIMS Microglia are the primary antigen presenting cells in the central nervous system and the retina, and can harbour viral antigens that may damage neural tissue via the release of neurotoxins. All cells bearing CD4 molecules and co-receptors (members of the chemokine receptor and Fcgamma receptor families) are potential targets for the human immunodeficiency virus (HIV). In this study, retinal microglia (in vitro and in situ) were investigated for the expression of candidate HIV-1 binding receptors. METHODS Cultured human retinal microglia and frozen sections of human retinas were used. Immunohistochemistry was used to investigate expression of cell surface receptors necessary for HIV-1 infection: CD4, CC chemokine receptor 5 (CCR5), and Fcgamma receptors. RESULTS Human retinal microglia expressed detectable levels of CD4, CD16, CD64, and CCR5 in vitro and Fcgamma receptor I (CD64) in situ. CONCLUSIONS Human retinal microglia express several candidate receptors required for viral binding and as such may be a potential reservoir for HIV-1 infection.
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Affiliation(s)
- V T Pham
- Save Sight Institute, GPO Box 4337, Sydney NSW 2001 Australia
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Stewart NA, Pham VT, Choma CT, Kaplan H. Improved peptide detection with matrix-assisted laser desorption/ionization mass spectrometry by trimethylation of amino groups. Rapid Commun Mass Spectrom 2002; 16:1448-1453. [PMID: 12125021 DOI: 10.1002/rcm.726] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Trimethyl alpha-amino derivatives of peptides (penta to deca) with a permanent positive charge on their alpha-amino groups were prepared by in vacuo reaction with iodomethane and subjected to matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). Compared to the unmodified peptide, the signal intensity of the trimethyl alpha-amino derivative in MALDI-MS is increased by at least an order of magnitude. Similarly, an octapeptide with a trimethylated epsilon-amino group derived from the solitary lysine residue of the B-chain of insulin also shows the same relative increase in signal intensity. Another advantage of the in vacuo methylation procedure is that trimethylation of a peptide amino group can be carried out readily with a combination of isotopes (13)CH(3)I and (12)CH(3)I or CD(3)I and CH(3)I, yielding a doublet signal either 3 or 9 units apart, respectively. The presence or absence of such a doublet signal can be used as a criterion to discriminate between peptide and non-peptide signals in the mass spectrum.
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Affiliation(s)
- N A Stewart
- Department of Chemistry, University of Ottawa, Ottawa, ON K1N 6N5, Canada
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Clairmont FR, Milne RE, Pham VT, Carrière MB, Kaplan H. Role of DNA in the activation of the Cry1A insecticidal crystal protein from Bacillus thuringiensis. J Biol Chem 1998; 273:9292-6. [PMID: 9535923 DOI: 10.1074/jbc.273.15.9292] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The Cry1A insecticidal crystal protein (protoxin) from six subspecies of Bacillus thuringiensis as well as the Cry1Aa, Cry1Ab, and Cry1Ac proteins cloned in Escherichia coli was found to contain 20-kilobase pair DNA. Only the N-terminal toxic moiety of the protoxin was found to interact with the DNA. Analysis of the crystal gave approximately 3 base pairs of DNA per molecule of protoxin, indicating that only a small region of the N-terminal toxic moiety interacts with the DNA. It is proposed that the DNA-protoxin complex is virus-like in structure with a central DNA core surrounded by protein interacting with the DNA with the peripheral ends of the C-terminal region extending outward. It is shown that this structure accounts for the unusual proteolysis observed in the generation of toxin in which it appears that peptides are removed by obligatory sequential cleavages starting from the C terminus of the protoxin. Activation of the protoxin by spruce budworm (Choristoneura fumiferana) gut juice is shown to proceed through intermediates consisting of protein-DNA complexes. Larval trypsin initially converts the 20-kilobase pair DNA-protoxin complex to a 20-kilobase pair DNA-toxin complex, which is subsequently converted to a 100-base pair DNA-toxin complex by a gut nuclease and ultimately to the DNA-free toxin.
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Affiliation(s)
- F R Clairmont
- Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5
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Affiliation(s)
- W C Van Voorhis
- Department of Medicine, University of Washington, Seattle 98195, USA
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Legrand V, Beckers A, Pham VT, Demoulin JC, Stevenaert A. Dramatic improvement of severe dilated cardiomyopathy in an acromegalic patient after treatment with octreotide and trans-sphenoidal surgery. Eur Heart J 1994; 15:1286-9. [PMID: 7982434 DOI: 10.1093/oxfordjournals.eurheartj.a060668] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Severe congestive heart failure developed in an acromegalic patient, and was successfully treated with octreotide followed by trans-sphenoidal surgery. Clinical, hormonal echocardiographic and haemodynamic findings as well as histological heart examination before and after treatment revealed that over-production of growth hormone may induce the myocardial cell degeneration responsible for mechanical heart dysfunction. In addition, this unique example demonstrates the reversibility of myocardial damage following octreotide and trans-sphenoidal surgery, leading to significant improvement in cardiac function with minimal diastolic dysfunction and moderate interstitial fibrosis.
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Affiliation(s)
- V Legrand
- Department of Endocrinology, Centre Hospitalier, Universitaire de Liège, Belgium
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Beckers A, Pham VT, Abs R, Foidart-Willems J, Meurisse M. [Scintigraphic localization of neuroendocrine tumors and their metastases using a somatostatin analog [111In-DTPA-d-phe1] octreotide]. Rev Med Liege 1993; 48:326-334. [PMID: 8101999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Affiliation(s)
- A Beckers
- Service d'Endocrinologie, Université de Liège
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