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Zachová K, Bartheldyová E, Hubatka F, Křupka M, Odehnalová N, Turánek Knötigová P, Vaškovicová N, Sloupenská K, Hromádka R, Paulovičová E, Effenberg R, Ledvina M, Raška M, Turánek J. The immunogenicity of p24 protein from HIV-1 virus is strongly supported and modulated by coupling with liposomes and mannan. Carbohydr Polym 2024; 332:121844. [PMID: 38431385 DOI: 10.1016/j.carbpol.2024.121844] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 12/31/2023] [Accepted: 01/18/2024] [Indexed: 03/05/2024]
Abstract
Anti-viral and anti-tumor vaccines aim to induce cytotoxic CD8+ T cells (CTL) and antibodies. Conserved protein antigens, such as p24 from human immunodeficiency virus, represent promising component for elicitation CTLs, nevertheless with suboptimal immunogenicity, if formulated as recombinant protein. To enhance immunogenicity and CTL response, recombinant proteins may be targeted to dendritic cells (DC) for cross presentation on MHCI, where mannose receptor and/or other lectin receptors could play an important role. Here, we constructed liposomal carrier-based vaccine composed of recombinant p24 antigen bound by metallochelating linkage onto surface of nanoliposomes with surface mannans coupled by aminooxy ligation. Generated mannosylated proteonanoliposomes were analyzed by dynamic light scattering, isothermal titration, and electron microscopy. Using murine DC line MutuDC and murine bone marrow derived DC (BMDC) we evaluated their immunogenicity and immunomodulatory activity. We show that p24 mannosylated proteonanoliposomes activate DC for enhanced MHCI, MHCII and CD40, CD80, and CD86 surface expression both on MutuDC and BMDC. p24 mannosylated liposomes were internalized by MutuDC with p24 intracellular localization within 1 to 3 h. The combination of metallochelating and aminooxy ligation could be used simultaneously to generate nanoliposomal adjuvanted recombinant protein-based vaccines versatile for combination of recombinant antigens relevant for antibody and CTL elicitation.
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Affiliation(s)
- K Zachová
- Department of Immunology, Faculty of Medicine and Dentistry, Palacky University Olomouc and University Hospital Olomouc, Hněvotínská 3, Olomouc, Czech Republic
| | - E Bartheldyová
- C2P NEXARS, The Campus Science Park, Palachovo náměstí 2, Brno, Czech Republic
| | - F Hubatka
- C2P NEXARS, The Campus Science Park, Palachovo náměstí 2, Brno, Czech Republic
| | - M Křupka
- Department of Immunology, Faculty of Medicine and Dentistry, Palacky University Olomouc and University Hospital Olomouc, Hněvotínská 3, Olomouc, Czech Republic
| | - N Odehnalová
- C2P NEXARS, The Campus Science Park, Palachovo náměstí 2, Brno, Czech Republic
| | - P Turánek Knötigová
- C2P NEXARS, The Campus Science Park, Palachovo náměstí 2, Brno, Czech Republic
| | - N Vaškovicová
- Faculty of Medicine, Masaryk University, Kamenice 5, Brno, Czech Republic
| | - K Sloupenská
- Department of Immunology, Faculty of Medicine and Dentistry, Palacky University Olomouc and University Hospital Olomouc, Hněvotínská 3, Olomouc, Czech Republic
| | - R Hromádka
- C2P NEXARS, The Campus Science Park, Palachovo náměstí 2, Brno, Czech Republic
| | - E Paulovičová
- Center for Glycomics, Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava, Slovakia
| | - R Effenberg
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology, Technická 5, Prague, Czech Republic
| | - M Ledvina
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology, Technická 5, Prague, Czech Republic
| | - M Raška
- Department of Immunology, Faculty of Medicine and Dentistry, Palacky University Olomouc and University Hospital Olomouc, Hněvotínská 3, Olomouc, Czech Republic.
| | - J Turánek
- Department of Immunology, Faculty of Medicine and Dentistry, Palacky University Olomouc and University Hospital Olomouc, Hněvotínská 3, Olomouc, Czech Republic; C2P NEXARS, The Campus Science Park, Palachovo náměstí 2, Brno, Czech Republic; Institute of Clinical Immunology & Allergology, Charles University Prague and University Hospital, Hradec Kralove, Sokolská 581, Hradec Kralove, Czech Republic.
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Bartheldyová E, Turánek Knotigová P, Zachová K, Mašek J, Kulich P, Effenberg R, Zyka D, Hubatka F, Kotouček J, Čelechovská H, Héžová R, Tomečková A, Mašková E, Fojtíková M, Macaulay S, Bystrický P, Paulovičová L, Paulovičová E, Drož L, Ledvina M, Raška M, Turánek J. N-Oxy lipid-based click chemistry for orthogonal coupling of mannan onto nanoliposomes prepared by microfluidic mixing: Synthesis of lipids, characterisation of mannan-coated nanoliposomes and in vitro stimulation of dendritic cells. Carbohydr Polym 2018; 207:521-532. [PMID: 30600036 DOI: 10.1016/j.carbpol.2018.10.121] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 10/18/2018] [Accepted: 10/25/2018] [Indexed: 11/26/2022]
Abstract
New synthetic aminooxy lipid was designed and synthesized as a building block for the formulation of functionalised nanoliposomes (presenting onto the outer surface of aminooxy groups) by microfluidic mixing. Orthogonal binding of cellular mannan (Candida glabrata (CCY 26-20-1) onto the outer surface of functionalised nanoliposomes was modified by orthogonal binding of reducing termini of mannans to oxime lipids via a click chemistry reaction based on aminooxy coupling (oxime ligation). The aminooxy lipid was proved as a suitable active component for preparation of functionalised nanoliposomes by the microfluidic mixing method performed with the instrument NanoAssemblr™. This "on-chip technology" can be easily scaled-up. The structure of mannan-liposomes was visualized by transmission and scanning electron microscopy, including immunogold staining of recombinant mannan receptor bound onto mannosylated-liposomes. The observed structures are in a good correlation with data obtained by DLS, NTA, and TPRS methods. In vitro experiments on human and mouse dendritic cells demonstrate selective internalisation of fluorochrome-labelled mannan-liposomes and their ability to stimulate DC comparable to lipopolysaccharide. We describe a potentially new drug delivery platform for mannan receptor-targeted antimicrobial drugs as well as for immunotherapeutics. Furthermore, the platform based on mannans bound orthogonally onto the surface of nanoliposomes represents a self-adjuvanted carrier for construction of liposome-based recombinant vaccines for both systemic and mucosal routes of administration.
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Affiliation(s)
- Eliška Bartheldyová
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic
| | - Pavlína Turánek Knotigová
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic
| | - Kateřina Zachová
- Department of Immunology and Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University Olomouc, Hněvotínská 3, 775 15 Olomouc, Czech Republic
| | - Josef Mašek
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic
| | - Pavel Kulich
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic
| | - Roman Effenberg
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology, Technická 5, 166, 28 Prague 6, Czech Republic
| | - Daniel Zyka
- APIGENEX s.r.o., Poděbradská 173/5, Prague 9, 190 00, Czech Republic
| | - František Hubatka
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic
| | - Jan Kotouček
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic
| | - Hana Čelechovská
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic
| | - Renata Héžová
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic
| | - Andrea Tomečková
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic
| | - Eliška Mašková
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic
| | - Martina Fojtíková
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic
| | | | - Peter Bystrický
- Division of Neurosciences, Biomedical Center Martin, Jessenius Faculty of Medicine in Martin, Comenius University, Malá Hora 10701/4A, 036 01 Martin, Slovakia
| | - Lucia Paulovičová
- Department of Immunochemistry of Glycoconjugates, Immunology & Cell Culture Laboratory, Institute of Chemistry, Center for Glycomics Slovak Academy of Sciences, Dubravska cesta 9, 845 38 Bratislava, Slovakia
| | - Ema Paulovičová
- Department of Immunochemistry of Glycoconjugates, Immunology & Cell Culture Laboratory, Institute of Chemistry, Center for Glycomics Slovak Academy of Sciences, Dubravska cesta 9, 845 38 Bratislava, Slovakia.
| | - Ladislav Drož
- APIGENEX s.r.o., Poděbradská 173/5, Prague 9, 190 00, Czech Republic
| | - Miroslav Ledvina
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology, Technická 5, 166, 28 Prague 6, Czech Republic.
| | - Milan Raška
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic; Department of Immunology and Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University Olomouc, Hněvotínská 3, 775 15 Olomouc, Czech Republic.
| | - Jaroslav Turánek
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, v.v.i., Hudcova 70, 621 00 Brno, Czech Republic.
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Bartheldyová E, Effenberg R, Mašek J, Procházka L, Knötigová PT, Kulich P, Hubatka F, Velínská K, Zelníčková J, Zouharová D, Fojtíková M, Hrebík D, Plevka P, Mikulík R, Miller AD, Macaulay S, Zyka D, Drož L, Raška M, Ledvina M, Turánek J. Hyaluronic Acid Surface Modified Liposomes Prepared via Orthogonal Aminoxy Coupling: Synthesis of Nontoxic Aminoxylipids Based on Symmetrically α-Branched Fatty Acids, Preparation of Liposomes by Microfluidic Mixing, and Targeting to Cancer Cells Expressing CD44. Bioconjug Chem 2018; 29:2343-2356. [PMID: 29898364 DOI: 10.1021/acs.bioconjchem.8b00311] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
New synthetic aminoxy lipids are designed and synthesized as building blocks for the formulation of functionalized nanoliposomes by microfluidization using a NanoAssemblr. Orthogonal binding of hyaluronic acid onto the outer surface of functionalized nanoliposomes via aminoxy coupling ( N-oxy ligation) is achieved at hemiacetal function of hyaluronic acid and the structure of hyaluronic acid-liposomes is visualized by transmission electron microscopy and cryotransmission electron microscopy. Observed structures are in a good correlation with data obtained by dynamic light scattering (size and ζ-potential). In vitro experiments on cell lines expressing CD44 receptors demonstrate selective internalization of fluorochrome-labeled hyaluronic acid-liposomes, while cells with down regulated CD44 receptor levels exhibit very low internalization of hyaluronic acid-liposomes. A method based on microfluidization mixing was developed for preparation of monodispersive unilamellar liposomes containing aminoxy lipids and orthogonal binding of hyaluronic acid onto the liposomal surface was demonstrated. These hyaluronic acid-liposomes represent a potentially new drug delivery platform for CD44-targeted anticancer drugs as well as for immunotherapeutics and vaccines.
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Affiliation(s)
- Eliška Bartheldyová
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Roman Effenberg
- Department of Chemistry of Natural Compounds , University of Chemistry and Technology , Technická 5 , 166 28 Prague 6, Czech Republic
| | - Josef Mašek
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Lubomír Procházka
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Pavlína Turánek Knötigová
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Pavel Kulich
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - František Hubatka
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Kamila Velínská
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Jaroslava Zelníčková
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Darina Zouharová
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Martina Fojtíková
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Dominik Hrebík
- Central European Institute of Technology CEITEC, Structural Virology , Masaryk University , Kamenice 753/5 , 62500 Brno , Czech Republic
| | - Pavel Plevka
- Central European Institute of Technology CEITEC, Structural Virology , Masaryk University , Kamenice 753/5 , 62500 Brno , Czech Republic
| | - Robert Mikulík
- The International Clinical Research Center of St. Anne's University Hospital Brno , 656 91 Brno , Czech Republic
| | - Andrew D Miller
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
| | - Stuart Macaulay
- Malvern Instruments , Great Malvern WR14 1XZ , United Kingdom
| | - Daniel Zyka
- APIGENEX s.r.o. , Poděbradská 173/5 , Prague 9 , 190 00 , Czech Republic
| | - Ladislav Drož
- APIGENEX s.r.o. , Poděbradská 173/5 , Prague 9 , 190 00 , Czech Republic
| | - Milan Raška
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic.,Department of Immunology and Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry , Palacky University Olomouc , Hněvotínská 3 , 775 15 Olomouc , Czech Republic
| | - Miroslav Ledvina
- Department of Chemistry of Natural Compounds , University of Chemistry and Technology , Technická 5 , 166 28 Prague 6, Czech Republic
| | - Jaroslav Turánek
- Department of Pharmacology and Immunotherapy , Veterinary Research Institute, v.v.i. , Hudcova 70 , 621 00 Brno , Czech Republic
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Effenberg R, Turánek Knötigová P, Zyka D, Čelechovská H, Mašek J, Bartheldyová E, Hubatka F, Koudelka Š, Lukáč R, Kovalová A, Šaman D, Křupka M, Barkocziova L, Kosztyu P, Šebela M, Drož L, Hučko M, Kanásová M, Miller AD, Raška M, Ledvina M, Turánek J. Nonpyrogenic Molecular Adjuvants Based on norAbu-Muramyldipeptide and norAbu-Glucosaminyl Muramyldipeptide: Synthesis, Molecular Mechanisms of Action, and Biological Activities in Vitro and in Vivo. J Med Chem 2017; 60:7745-7763. [PMID: 28829599 DOI: 10.1021/acs.jmedchem.7b00593] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Fatty acyl analogues of muramyldipeptide (MDP) (abbreviated N-L18 norAbuGMDP, N-B30 norAbuGMDP, norAbuMDP-Lys(L18), norAbuMDP-Lys(B30), norAbuGMDP-Lys(L18), norAbuGMDP-Lys(B30), B30 norAbuMDP, L18 norAbuMDP) are designed and synthesized comprising the normuramyl-l-α-aminobutanoyl (norAbu) structural moiety. All new analogues show depressed pyrogenicity in both free (micellar) state and in liposomal formulations when tested in rabbits in vivo (sc and iv application). New analogues are also shown to be selective activators of NOD2 and NLRP3 (inflammasome) in vitro but not NOD1. Potencies of NOD2 and NLRP3 stimulation are found comparable with free MDP and other positive controls. Analogues are also demonstrated to be effective in stimulating cellular proliferation when the sera from mice are injected sc with individual liposome-loaded analogues, causing proliferation of bone marrow-derived GM-progenitors cells. Importantly, vaccination nanoparticles prepared from metallochelation liposomes, His-tagged antigen rOspA from Borrelia burgdorferi, and lipophilic analogue norAbuMDP-Lys(B30) as adjuvant, are shown to provoke OspA-specific antibody responses with a strong Th1-bias (dominance of IgG2a response). In contrast, the adjuvant effects of Alum or parent MDP show a strong Th2-bias (dominance of IgG1 response).
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Affiliation(s)
- Roman Effenberg
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology , Technická 5,166 28 Prague 6, Czech Republic
| | - Pavlína Turánek Knötigová
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute vvi , Hudcova 70, 621 00 Brno, Czech Republic
| | - Daniel Zyka
- APIGENEX s.r.o. , Poděbradská 173/5, Prague 9, 190 00, Czech Republic
| | - Hana Čelechovská
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute vvi , Hudcova 70, 621 00 Brno, Czech Republic
| | - Josef Mašek
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute vvi , Hudcova 70, 621 00 Brno, Czech Republic
| | - Eliška Bartheldyová
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute vvi , Hudcova 70, 621 00 Brno, Czech Republic
| | - František Hubatka
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute vvi , Hudcova 70, 621 00 Brno, Czech Republic
| | - Štěpán Koudelka
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute vvi , Hudcova 70, 621 00 Brno, Czech Republic
| | - Róbert Lukáč
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute vvi , Hudcova 70, 621 00 Brno, Czech Republic
| | - Anna Kovalová
- Institute of Organic Chemistry and Biochemistry, AS CR vvi Flemingovo nám 2, 160 00 Prague, Czech Republic
| | - David Šaman
- Institute of Organic Chemistry and Biochemistry, AS CR vvi Flemingovo nám 2, 160 00 Prague, Czech Republic
| | - Michal Křupka
- Department of Immunology, Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University Olomouc , Hněvotínská 3, 775 15 Olomouc, Czech Republic
| | - Lucia Barkocziova
- Department of Immunology, Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University Olomouc , Hněvotínská 3, 775 15 Olomouc, Czech Republic
| | - Petr Kosztyu
- Department of Immunology, Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University Olomouc , Hněvotínská 3, 775 15 Olomouc, Czech Republic
| | - Marek Šebela
- Centre of the Region Hana for Biotechnological and Agricultural Research, Faculty of Science, Palacky University Olomouc , 775 15 Olomouc, Czech Republic
| | - Ladislav Drož
- APIGENEX s.r.o. , Poděbradská 173/5, Prague 9, 190 00, Czech Republic
| | - Michal Hučko
- APIGENEX s.r.o. , Poděbradská 173/5, Prague 9, 190 00, Czech Republic.,Department of Organic Chemistry, University of Chemistry and Technology , Technická 5, 166 28 Prague 6, Czech Republic
| | - Mária Kanásová
- APIGENEX s.r.o. , Poděbradská 173/5, Prague 9, 190 00, Czech Republic.,Department of Analytical Chemistry, Faculty of Science, Charles University , Hlavova 2030/8, 128 43 Prague 2, Czech Republic
| | - Andrew D Miller
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute vvi , Hudcova 70, 621 00 Brno, Czech Republic.,Institute of Pharmaceutical Science, King's College London , London SE1 9NH, United Kingdom.,KP Therapeutics Ltd. , Manchester M3 2ER, United Kingdom
| | - Milan Raška
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute vvi , Hudcova 70, 621 00 Brno, Czech Republic.,Department of Immunology, Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University Olomouc , Hněvotínská 3, 775 15 Olomouc, Czech Republic
| | - Miroslav Ledvina
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology , Technická 5,166 28 Prague 6, Czech Republic
| | - Jaroslav Turánek
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute vvi , Hudcova 70, 621 00 Brno, Czech Republic
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Petrakova V, Benson V, Buncek M, Fiserova A, Ledvina M, Stursa J, Cigler P, Nesladek M. Imaging of transfection and intracellular release of intact, non-labeled DNA using fluorescent nanodiamonds. Nanoscale 2016; 8:12002-12. [PMID: 27240633 DOI: 10.1039/c6nr00610h] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Efficient delivery of stabilized nucleic acids (NAs) into cells and release of the NA payload are crucial points in the transfection process. Here we report on the fabrication of a nanoscopic cellular delivery carrier that is additionally combined with a label-free intracellular sensor device, based on biocompatible fluorescent nanodiamond particles. The sensing function is engineered into nanodiamonds by using nitrogen-vacancy color centers, providing stable non-blinking luminescence. The device is used for monitoring NA transfection and the payload release in cells. The unpacking of NAs from a poly(ethyleneimine)-terminated nanodiamond surface is monitored using the color shift of nitrogen-vacancy centers in the diamond, which serve as a nanoscopic electric charge sensor. The proposed device innovates the strategies for NA imaging and delivery, by providing detection of the intracellular release of non-labeled NAs without affecting cellular processing of the NAs. Our system highlights the potential of nanodiamonds to act not merely as labels but also as non-toxic and non-photobleachable fluorescent biosensors reporting complex molecular events.
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Affiliation(s)
- V Petrakova
- Faculty of Biomedical Engineering, Czech Technical University in Prague, Sitna sq. 3105, 272 01 Kladno, Czech Republic and Institute of Physics AS CR, v.v.i, Na Slovance 1999/2, 182 21 Prague 8, Czech Republic
| | - V Benson
- Faculty of Biomedical Engineering, Czech Technical University in Prague, Sitna sq. 3105, 272 01 Kladno, Czech Republic and Institute of Microbiology AS CR, v.v.i, Videnska 1083, 142 20 Prague 4, Czech Republic
| | - M Buncek
- Generi Biotech Ltd., Machkova 587, 500 11 Hradec Kralove, Czech Republic
| | - A Fiserova
- Faculty of Biomedical Engineering, Czech Technical University in Prague, Sitna sq. 3105, 272 01 Kladno, Czech Republic and Institute of Microbiology AS CR, v.v.i, Videnska 1083, 142 20 Prague 4, Czech Republic
| | - M Ledvina
- Faculty of Biomedical Engineering, Czech Technical University in Prague, Sitna sq. 3105, 272 01 Kladno, Czech Republic and Institute of Organic Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nam. 2, 166 10 Prague 6, Czech Republic.
| | - J Stursa
- Nuclear Physics Institute AS CR, v.v.i., 250 68, Rez near Prague, Czech Republic
| | - P Cigler
- Institute of Organic Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nam. 2, 166 10 Prague 6, Czech Republic.
| | - M Nesladek
- Faculty of Biomedical Engineering, Czech Technical University in Prague, Sitna sq. 3105, 272 01 Kladno, Czech Republic and IMEC Division IMOMEC, Hasselt University, Wetenschapspark 1, B-3590, Diepenbeek, Belgium and Institute for Materials Research, Hasselt University, Wetenschapspark 1, B-3590 Diepenbeek, Belgium.
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6
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Krupka M, Masek J, Barkocziova L, Turanek Knotigova P, Kulich P, Plockova J, Lukac R, Bartheldyova E, Koudelka S, Chaloupkova R, Sebela M, Zyka D, Droz L, Effenberg R, Ledvina M, Miller AD, Turanek J, Raska M. The Position of His-Tag in Recombinant OspC and Application of Various Adjuvants Affects the Intensity and Quality of Specific Antibody Response after Immunization of Experimental Mice. PLoS One 2016; 11:e0148497. [PMID: 26848589 PMCID: PMC4744052 DOI: 10.1371/journal.pone.0148497] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 01/20/2016] [Indexed: 12/29/2022] Open
Abstract
Lyme disease, Borrelia burgdorferi-caused infection, if not recognized and appropriately treated by antibiotics, may lead to chronic complications, thus stressing the need for protective vaccine development. The immune protection is mediated by phagocytic cells and by Borrelia-specific complement-activating antibodies, associated with the Th1 immune response. Surface antigen OspC is involved in Borrelia spreading through the host body. Previously we reported that recombinant histidine tagged (His-tag) OspC (rOspC) could be attached onto liposome surfaces by metallochelation. Here we report that levels of OspC-specific antibodies vary substantially depending upon whether rOspC possesses an N' or C' terminal His-tag. This is the case in mice immunized: (a) with rOspC proteoliposomes containing adjuvants MPLA or non-pyrogenic MDP analogue MT06; (b) with free rOspC and Montanide PET GEL A; (c) with free rOspC and alum; or (d) with adjuvant-free rOspC. Stronger responses are noted with all N'-terminal His-tag rOspC formulations. OspC-specific Th1-type antibodies predominate post-immunization with rOspC proteoliposomes formulated with MPLA or MT06 adjuvants. Further analyses confirmed that the structural features of soluble N' and C' terminal His-tag rOspC and respective rOspC proteoliposomes are similar including their thermal stabilities at physiological temperatures. On the other hand, a change in the position of the rOspC His-tag from N' to C' terminal appears to affect substantially the immunogenicity of rOspC arguably due to steric hindrance of OspC epitopes by the C' terminal His-tag itself and not due to differences in overall conformations induced by changes in the His-tag position in rOspC variants.
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Affiliation(s)
- Michal Krupka
- Department of Immunology, Faculty of Medicine and Dentistry, Palacky University Olomouc, Olomouc, Czech Republic
| | - Josef Masek
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, Brno, Czech Republic
| | - Lucia Barkocziova
- Department of Immunology, Faculty of Medicine and Dentistry, Palacky University Olomouc, Olomouc, Czech Republic
| | | | - Pavel Kulich
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, Brno, Czech Republic
| | - Jana Plockova
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, Brno, Czech Republic
| | - Robert Lukac
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, Brno, Czech Republic
| | - Eliska Bartheldyova
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, Brno, Czech Republic
| | - Stepan Koudelka
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, Brno, Czech Republic
- International Clinical Research Center, St. Anne´s University Hospital, Brno, Czech Republic
| | - Radka Chaloupkova
- International Clinical Research Center, St. Anne´s University Hospital, Brno, Czech Republic
- Loschmidt Laboratories, Department of Experimental Biology and Research Centre for Toxic Compounds in the Environment RECETOX, Masaryk University, Brno, Czech Republic
| | - Marek Sebela
- Centre of the Region Hana for Biotechnological and Agricultural Research, Faculty of Science, Palacky University Olomouc, Olomouc, Czech Republic
| | | | | | - Roman Effenberg
- Department of Chemistry of Natural Compounds University of Chemistry and Technology, Prague, Czech Republic
| | - Miroslav Ledvina
- Department of Chemistry of Natural Compounds University of Chemistry and Technology, Prague, Czech Republic
| | - Andrew D. Miller
- King's College London, Institute of Pharmaceutical Science, London, United Kingdom, and GlobalAcorn Ltd, London, United Kingdom
| | - Jaroslav Turanek
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, Brno, Czech Republic
- * E-mail: (MR); (JT)
| | - Milan Raska
- Department of Immunology, Faculty of Medicine and Dentistry, Palacky University Olomouc, Olomouc, Czech Republic
- Department of Pharmacology and Immunotherapy, Veterinary Research Institute, Brno, Czech Republic
- * E-mail: (MR); (JT)
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7
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Petrakova V, Rehor I, Stursa J, Ledvina M, Nesladek M, Cigler P. Charge-sensitive fluorescent nanosensors created from nanodiamonds. Nanoscale 2015; 7:12307-11. [PMID: 26138745 DOI: 10.1039/c5nr00712g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We show that fluorescent nanodiamonds (FNDs) are among the few types of nanosensors that enable direct optical reading of noncovalent molecular events. The unique sensing mechanism is based on switching between the negatively charged and neutral states of NV centers which is induced by the interaction of the FND surface with charged molecules.
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Affiliation(s)
- V Petrakova
- Faculty of Biomedical Engineering, Czech Technical University in Prague, Sitna sq. 3105, 272 01 Kladno, Czech Republic.
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8
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Kratochvílová I, Ashcheulov P, Kovalenko A, Záliš S, Ledvina M, Mičová J. Luminescent Diamond Nanoparticles: Physical, Chemical and Biological Aspects of the Phenomenon. J Nanosci Nanotechnol 2015; 15:1000-1005. [PMID: 26353605 DOI: 10.1166/jnn.2015.9740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Biosensors based on nanodiamonds are able to penetrate through the cell membrane in a targeted manner and probe changes in real-time in the inner cellular space. In this work we performed exclusive theoretical and experimental study of nanodiamond particles adjusted for application in optically-traceable intracellular nanodiamond sensors. Theoretical and experimental study of specific optical properties of high-pressure high-temperature nanodiamonds containing NV- and NV0 centres were performed. The results are supported by theoretical modeling. The final result of this study was detection of luminescence ND in living cells and in vivo application od luminiscence NDs in chicken embryo, showing the detectability of luminescence ND using a standard confocal microscope. On the level of in cells selectivity numerous clusters of ND particles were present within the cytoplasm and at the same time no particles were absent in the nucleus-ND particles can be used as imaging or delivery system for specific cell parts targeting. From our study we can say that biosensors based on nanodiamonds (NDs) are able to penetrate through the cell membrane in a targeted manner and probe changes in the inner cellular space.
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9
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Knotigová PT, Zyka D, Mašek J, Kovalová A, Křupka M, Bartheldyová E, Kulich P, Koudelka Š, Lukáč R, Kauerová Z, Vacek A, Horynová MS, Kozubík A, Miller AD, Fekete L, Kratochvílová I, Ježek J, Ledvina M, Raška M, Turánek J. Molecular Adjuvants Based on Nonpyrogenic Lipophilic Derivatives of norAbuMDP/GMDP Formulated in Nanoliposomes: Stimulation of Innate and Adaptive Immunity. Pharm Res 2015; 32:1186-99. [DOI: 10.1007/s11095-014-1516-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Accepted: 09/11/2014] [Indexed: 11/28/2022]
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10
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Moore L, Grobárová V, Shen H, Man HB, Míčová J, Ledvina M, Štursa J, Nesladek M, Fišerová A, Ho D. Comprehensive interrogation of the cellular response to fluorescent, detonation and functionalized nanodiamonds. Nanoscale 2014; 6:11712-21. [PMID: 25037888 PMCID: PMC4399863 DOI: 10.1039/c4nr02570a] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Nanodiamonds (NDs) are versatile nanoparticles that are currently being investigated for a variety of applications in drug delivery, biomedical imaging and nanoscale sensing. Although initial studies indicate that these small gems are biocompatible, there is a great deal of variability in synthesis methods and surface functionalization that has yet to be evaluated. Here we present a comprehensive analysis of the cellular compatibility of an array of nanodiamond subtypes and surface functionalization strategies. These results demonstrate that NDs are well tolerated by multiple cell types at both functional and gene expression levels. In addition, ND-mediated delivery of daunorubicin is less toxic to multiple cell types than treatment with daunorubicin alone, thus demonstrating the ability of the ND agent to improve drug tolerance and decrease therapeutic toxicity. Overall, the results here indicate that ND biocompatibility serves as a promising foundation for continued preclinical investigation.
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Affiliation(s)
- Laura Moore
- Biomedical Engineering, Northwestern University, Evanston, Illinois, USA
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11
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Kovalová A, Ledvina M, Šaman D, Zyka D, Kubíčková M, Žídek L, Sklenář V, Pompach P, Kavan D, Bílý J, Vaněk O, Kubínková Z, Libigerová M, Ivanová L, Antolíková M, Mrázek H, Rozbeský D, Hofbauerová K, Křen V, Bezouška K. Retraction: Synthetic N-Acetyl- d-glucosamine Based Fully Branched Tetrasaccharide, a Mimetic of the Endogenous Ligand for CD69, Activates CD69 + Killer Lymphocytes upon Dimerization via a Hydrophilic Flexible Linker. J Med Chem 2014; 57:5477. [DOI: 10.1021/jm5007726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Rehor I, Slegerova J, Kucka J, Proks V, Petrakova V, Adam MP, Treussart F, Turner S, Bals S, Sacha P, Ledvina M, Wen AM, Steinmetz NF, Cigler P. Fluorescent nanodiamonds embedded in biocompatible translucent shells. Small 2014; 10:1106-15. [PMID: 24500945 PMCID: PMC5207051 DOI: 10.1002/smll.201302336] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Indexed: 05/03/2023]
Abstract
High pressure high temperature (HPHT) nanodiamonds (NDs) represent extremely promising materials for construction of fluorescent nanoprobes and nanosensors. However, some properties of bare NDs limit their direct use in these applications: they precipitate in biological solutions, only a limited set of bio-orthogonal conjugation techniques is available and the accessible material is greatly polydisperse in shape. In this work, we encapsulate bright 30-nm fluorescent nanodiamonds (FNDs) in 10-20-nm thick translucent (i.e., not altering FND fluorescence) silica shells, yielding monodisperse near-spherical particles of mean diameter 66 nm. High yield modification of the shells with PEG chains stabilizes the particles in ionic solutions, making them applicable in biological environments. We further modify the opposite ends of PEG chains with fluorescent dyes or vectoring peptide using click chemistry. High conversion of this bio-orthogonal coupling yielded circa 2000 dye or peptide molecules on a single FND. We demonstrate the superior properties of these particles by in vitro interaction with human prostate cancer cells: while bare nanodiamonds strongly aggregate in the buffer and adsorb onto the cell membrane, the shell encapsulated NDs do not adsorb nonspecifically and they penetrate inside the cells.
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Affiliation(s)
- Ivan Rehor
- Institute of Organic Chemistry and Biochemistry, AS CR, v.v.i. Flemingovo nam. 2, Prague 6, 166 10, Czech Republic
| | - Jitka Slegerova
- Institute of Organic Chemistry and Biochemistry, AS CR, v.v.i. Flemingovo nam. 2, Prague 6, 166 10, Czech Republic
| | - Jan Kucka
- Institute of Macromolecular Chemistry AS CR, v.v.i. Heyrovského nám. 2, Prague 6, 162 06, Czech Republic
- Nuclear Physics Institute AS CR, v.v.i. Rez near Prague, 250 68, Czech Republic
| | - Vladimir Proks
- Institute of Macromolecular Chemistry AS CR, v.v.i. Heyrovského nám. 2, Prague 6, 162 06, Czech Republic
| | - Vladimira Petrakova
- Faculty of Biomedical Engineering, Czech Technical University in Prague, Sítná sq. 3105, 272 01 Kladno (Czech Republic) and Institute of Physics AS CR, v.v.i, Prague 8, Czech Republic
| | - Marie-Pierre Adam
- Laboratoire de Photonique Quantique et Moléculaire, UMR 8537 CNRS and ENS Cachan, F-94235 Cachan (France), Laboratoire Aimé Cotton, CNRS, Université Paris Sud and ENS Cachan, F-91405, Orsay, France
| | - François Treussart
- Laboratoire de Photonique Quantique et Moléculaire, UMR 8537 CNRS and ENS Cachan, F-94235 Cachan (France), Laboratoire Aimé Cotton, CNRS, Université Paris Sud and ENS Cachan, F-91405, Orsay, France
| | - Stuart Turner
- EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium
| | - Sara Bals
- EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium
| | - Pavel Sacha
- Institute of Organic Chemistry and Biochemistry, AS CR, v.v.i. Flemingovo nam. 2, Prague 6, 166 10, Czech Republic
| | - Miroslav Ledvina
- Institute of Organic Chemistry and Biochemistry, AS CR, v.v.i. Flemingovo nam. 2, Prague 6, 166 10, Czech Republic
| | - Amy M. Wen
- Department of Biomedical Engineering, Case Western Reserve University, School of Medicine and Engineering, 10990 Euclid Avenue, Cleveland, Ohio, USA
| | - Nicole F. Steinmetz
- Department of Biomedical Engineering, Case Western Reserve University, School of Medicine and Engineering, 10990 Euclid Avenue, Cleveland, Ohio, USA
| | - Petr Cigler
- Institute of Organic Chemistry and Biochemistry, AS CR, v.v.i. Flemingovo nam. 2, Prague 6, 166 10, Czech Republic
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13
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Rehor I, Mackova H, Filippov SK, Kucka J, Proks V, Slegerova J, Turner S, Van Tendeloo G, Ledvina M, Hruby M, Cigler P. Fluorescent Nanodiamonds with Bioorthogonally Reactive Protein-Resistant Polymeric Coatings. Chempluschem 2013; 79:21-24. [DOI: 10.1002/cplu.201300339] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Indexed: 11/08/2022]
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14
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Rehor I, Mackova H, Filippov SK, Kucka J, Proks V, Slegerova J, Turner S, Van Tendeloo G, Ledvina M, Hruby M, Cigler P. Back Cover: Fluorescent Nanodiamonds with Bioorthogonally Reactive Protein-Resistant Polymeric Coatings (ChemPlusChem 1/2014). Chempluschem 2013. [DOI: 10.1002/cplu.201300395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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15
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Dong LF, Jameson VJA, Tilly D, Prochazka L, Rohlena J, Valis K, Truksa J, Zobalova R, Mahdavian E, Kluckova K, Stantic M, Stursa J, Freeman R, Witting PK, Norberg E, Goodwin J, Salvatore BA, Novotna J, Turanek J, Ledvina M, Hozak P, Zhivotovsky B, Coster MJ, Ralph SJ, Smith RAJ, Neuzil J. Corrigendum to: "Mitochondrial targeting of α-tocopheryl succinate enhances its pro-apoptotic efficacy: A new paradigm for effective cancer therapy" [Free Radic Biol Med. 50 (2011) 1546-1555]. Free Radic Biol Med 2013; 65:895-896. [PMID: 30184722 DOI: 10.1016/j.freeradbiomed.2013.08.164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 08/14/2013] [Indexed: 11/25/2022]
Affiliation(s)
- Lan-Feng Dong
- School of Medical Science, Griffith University, Southport, QLD 4222, Australia.
| | | | - David Tilly
- Eskitis Institute for Cell and Molecular Therapies, Griffith University, Nathan, QLD, Australia
| | | | - Jakub Rohlena
- Institute of Biotechnology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Karel Valis
- Institute of Biotechnology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Jaroslav Truksa
- Institute of Biotechnology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Renata Zobalova
- School of Medical Science, Griffith University, Southport, QLD 4222, Australia; Institute of Biotechnology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Elahe Mahdavian
- Department of Chemistry and Physics, Louisiana State University Shreveport, Shreveport, LA 71115, USA
| | - Katarina Kluckova
- Institute of Biotechnology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Marina Stantic
- School of Medical Science, Griffith University, Southport, QLD 4222, Australia
| | - Jan Stursa
- Institute of Biochemistry and Organic Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Ruth Freeman
- School of Medical Science, Griffith University, Southport, QLD 4222, Australia
| | - Paul K Witting
- Discipline of Pathology, Bosch Research Institute, Sydney Medical School, University of Sydney, Sydney, NSW, Australia
| | - Erik Norberg
- Institute of Environmental Medicine, Karolinska Institute, Stockholm, Sweden
| | - Jacob Goodwin
- School of Medical Science, Griffith University, Southport, QLD 4222, Australia
| | - Brian A Salvatore
- Department of Chemistry and Physics, Louisiana State University Shreveport, Shreveport, LA 71115, USA
| | - Jana Novotna
- Institute of Biotechnology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | | | - Miroslav Ledvina
- Institute of Biochemistry and Organic Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Pavel Hozak
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Boris Zhivotovsky
- Institute of Environmental Medicine, Karolinska Institute, Stockholm, Sweden
| | - Mark J Coster
- Eskitis Institute for Cell and Molecular Therapies, Griffith University, Nathan, QLD, Australia
| | - Stephen J Ralph
- School of Medical Science, Griffith University, Southport, QLD 4222, Australia
| | - Robin A J Smith
- Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Jiri Neuzil
- School of Medical Science, Griffith University, Southport, QLD 4222, Australia; Institute of Biotechnology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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16
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Havlik J, Petrakova V, Rehor I, Petrak V, Gulka M, Stursa J, Kucka J, Ralis J, Rendler T, Lee SY, Reuter R, Wrachtrup J, Ledvina M, Nesladek M, Cigler P. Boosting nanodiamond fluorescence: towards development of brighter probes. Nanoscale 2013; 5:3208-3211. [PMID: 23314709 DOI: 10.1039/c2nr32778c] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A novel approach for preparation of ultra-bright fluorescent nanodiamonds (fNDs) was developed and the thermal and kinetic optimum of NV center formation was identified. Combined with a new oxidation method, this approach enabled preparation of particles that were roughly one order of magnitude brighter than particles prepared with commonly used procedures.
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Affiliation(s)
- Jan Havlik
- Institute of Organic Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nam. 2, 166 10, Prague 6, Czech Republic
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17
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Hofman J, Buncek M, Haluza R, Streinz L, Ledvina M, Cigler P. In vitro transfection mediated by dendrigraft poly(L-lysines): the effect of structure and molecule size. Macromol Biosci 2012; 13:167-76. [PMID: 23233456 DOI: 10.1002/mabi.201200303] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Revised: 10/08/2012] [Indexed: 12/20/2022]
Abstract
Dendritic poly(L-lysines) (DGL) constitute promising nanomaterials applicable as a nonviral gene-delivery vector. In this study, we evaluate the transfection abilities of four DGL generations with special emphasis on the systematic description of the relationship of how generation (i.e., molecule size) affects the transfection efficacy. Using Hep2 cells, we demonstrated that the capability of unmodified DGL to deliver plasmid is of a magnitude lower than that of jetPEI. On the other hand, employing the Hep2 cell line stably transduced with eGFP, we observed that DGL G5 delivers the siRNA oligonucleotide with the same efficiency as Lipofectamine 2000. In further experiments, it was shown that DGL affords excellent ability to bind DNA, protect it against DNase I attack, and internalize it into cells.
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Affiliation(s)
- Jakub Hofman
- Generi Biotech Ltd., Machkova 587, 500 11 Hradec Kralove, Czech Republic
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18
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Křupka M, Mašek J, Bartheldyová E, Turánek Knötigová P, Plocková J, Korvasová Z, Škrabalová M, Koudelka Š, Kulich P, Zachová K, Czerneková L, Strouhal O, Horynová M, Šebela M, Miller AD, Ledvina M, Raška M, Turánek J. Enhancement of immune response towards non-lipidized Borrelia burgdorferi recombinant OspC antigen by binding onto the surface of metallochelating nanoliposomes with entrapped lipophilic derivatives of norAbuMDP. J Control Release 2012; 160:374-81. [PMID: 22387453 DOI: 10.1016/j.jconrel.2012.02.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Revised: 02/17/2012] [Accepted: 02/18/2012] [Indexed: 10/28/2022]
Abstract
Lyme disease caused by spirochete Borrelia burgdorferi sensu lato, is a tick-born illness. If the infection is not eliminated by the host immune system and/or antibiotics, it may further disseminate and cause severe chronic complications. The immune response to Borrelia is mediated by phagocytic cells and by Borrelia-specific complement-activating antibodies associated with Th1 cell activation. A new experimental vaccine was constructed using non-lipidized form of recombinant B. burgdorferi s.s. OspC protein was anchored by metallochelating bond onto the surface of nanoliposomes containing novel nonpyrogenic lipophilized norAbuMDP analogues denoted MT05 and MT06. After i.d. immunization, the experimental vaccines surpassed Alum with respect to OspC-specific titers of IgG2a, IgG2b isotypes when MT06 was used and IgG3, IgM isotypes when MT05 was used. Both adjuvants exerted a high adjuvant effect comparable or better than MDP and proved themselves as nonpyrogenic.
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Affiliation(s)
- Michal Křupka
- Department of Immunology, Palacky University in Olomouc, Czech Republic
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19
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Rohlena J, Dong LF, Kluckova K, Zobalova R, Goodwin J, Tilly D, Stursa J, Pecinova A, Philimonenko A, Hozak P, Banerjee J, Ledvina M, Sen CK, Houstek J, Coster MJ, Neuzil J. Mitochondrially targeted α-tocopheryl succinate is antiangiogenic: potential benefit against tumor angiogenesis but caution against wound healing. Antioxid Redox Signal 2011; 15:2923-35. [PMID: 21902599 PMCID: PMC3201633 DOI: 10.1089/ars.2011.4192] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AIMS A plausible strategy to reduce tumor progress is the inhibition of angiogenesis. Therefore, agents that efficiently suppress angiogenesis can be used for tumor suppression. We tested the antiangiogenic potential of a mitochondrially targeted analog of α-tocopheryl succinate (MitoVES), a compound with high propensity to induce apoptosis. RESULTS MitoVES was found to efficiently kill proliferating endothelial cells (ECs) but not contact-arrested ECs or ECs deficient in mitochondrial DNA, and suppressed angiogenesis in vitro by inducing accumulation of reactive oxygen species and induction of apoptosis in proliferating/angiogenic ECs. Resistance of arrested ECs was ascribed, at least in part, to the lower mitochondrial inner transmembrane potential compared with the proliferating ECs, thus resulting in the lower level of mitochondrial uptake of MitoVES. Shorter-chain homologs of MitoVES were less efficient in angiogenesis inhibition, thus suggesting a molecular mechanism of its activity. Finally, MitoVES was found to suppress HER2-positive breast carcinomas in a transgenic mouse as well as inhibit tumor angiogenesis. The antiangiogenic efficacy of MitoVES was corroborated by its inhibitory activity on wound healing in vivo. INNOVATION AND CONCLUSION We conclude that MitoVES, a mitochondrially targeted analog of α-tocopheryl succinate, is an efficient antiangiogenic agent of potential clinical relevance, exerting considerably higher activity than its untargeted counterpart. MitoVES may be helpful against cancer but may compromise wound healing.
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Affiliation(s)
- Jakub Rohlena
- Institute of Biotechnology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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20
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Dong LF, Jameson VJA, Tilly D, Prochazka L, Rohlena J, Valis K, Truksa J, Zobalova R, Mahdavian E, Kluckova K, Stantic M, Stursa J, Freeman R, Witting PK, Norberg E, Goodwin J, Salvatore BA, Novotna J, Turanek J, Ledvina M, Hozak P, Zhivotovsky B, Coster MJ, Ralph SJ, Smith RAJ, Neuzil J. Mitochondrial targeting of α-tocopheryl succinate enhances its pro-apoptotic efficacy: a new paradigm for effective cancer therapy. Free Radic Biol Med 2011; 50:1546-55. [PMID: 21402148 DOI: 10.1016/j.freeradbiomed.2011.02.032] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2010] [Revised: 02/16/2011] [Accepted: 02/25/2011] [Indexed: 12/20/2022]
Abstract
Mitochondria are emerging as intriguing targets for anti-cancer agents. We tested here a novel approach, whereby the mitochondrially targeted delivery of anti-cancer drugs is enhanced by the addition of a triphenylphosphonium group (TPP(+)). A mitochondrially targeted analog of vitamin E succinate (MitoVES), modified by tagging the parental compound with TPP(+), induced considerably more robust apoptosis in cancer cells with a 1-2 log gain in anti-cancer activity compared to the unmodified counterpart, while maintaining selectivity for malignant cells. This is because MitoVES associates with mitochondria and causes fast generation of reactive oxygen species that then trigger mitochondria-dependent apoptosis, involving transcriptional modulation of the Bcl-2 family proteins. MitoVES proved superior in suppression of experimental tumors compared to the untargeted analog. We propose that mitochondrially targeted delivery of anti-cancer agents offers a new paradigm for increasing the efficacy of compounds with anti-cancer activity.
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Affiliation(s)
- Lan-Feng Dong
- School of Medical Science, Griffith University, Southport, QLD 4222, Australia.
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21
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Dong LF, Jameson VJA, Tilly D, Cerny J, Mahdavian E, Marín-Hernández A, Hernández-Esquivel L, Rodríguez-Enríquez S, Stursa J, Witting PK, Stantic B, Rohlena J, Truksa J, Kluckova K, Dyason JC, Ledvina M, Salvatore BA, Moreno-Sánchez R, Coster MJ, Ralph SJ, Smith RAJ, Neuzil J. Mitochondrial targeting of vitamin E succinate enhances its pro-apoptotic and anti-cancer activity via mitochondrial complex II. J Biol Chem 2011; 286:3717-28. [PMID: 21059645 PMCID: PMC3030374 DOI: 10.1074/jbc.m110.186643] [Citation(s) in RCA: 152] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2010] [Revised: 10/28/2010] [Indexed: 12/27/2022] Open
Abstract
Mitochondrial complex II (CII) has been recently identified as a novel target for anti-cancer drugs. Mitochondrially targeted vitamin E succinate (MitoVES) is modified so that it is preferentially localized to mitochondria, greatly enhancing its pro-apoptotic and anti-cancer activity. Using genetically manipulated cells, MitoVES caused apoptosis and generation of reactive oxygen species (ROS) in CII-proficient malignant cells but not their CII-dysfunctional counterparts. MitoVES inhibited the succinate dehydrogenase (SDH) activity of CII with IC(50) of 80 μM, whereas the electron transfer from CII to CIII was inhibited with IC(50) of 1.5 μM. The agent had no effect either on the enzymatic activity of CI or on electron transfer from CI to CIII. Over 24 h, MitoVES caused stabilization of the oxygen-dependent destruction domain of HIF1α fused to GFP, indicating promotion of the state of pseudohypoxia. Molecular modeling predicted the succinyl group anchored into the proximal CII ubiquinone (UbQ)-binding site and successively reduced interaction energies for serially shorter phytyl chain homologs of MitoVES correlated with their lower effects on apoptosis induction, ROS generation, and SDH activity. Mutation of the UbQ-binding Ser(68) within the proximal site of the CII SDHC subunit (S68A or S68L) suppressed both ROS generation and apoptosis induction by MitoVES. In vivo studies indicated that MitoVES also acts by causing pseudohypoxia in the context of tumor suppression. We propose that mitochondrial targeting of VES with an 11-carbon chain localizes the agent into an ideal position across the interface of the mitochondrial inner membrane and matrix, optimizing its biological effects as an anti-cancer drug.
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Affiliation(s)
| | | | - David Tilly
- the Eskitis Institute for Cell and Molecular Therapies, Griffith University, Nathan 4111, Queensland, Australia
| | | | - Elahe Mahdavian
- the Department of Chemistry and Physics, Louisiana State University, Shreveport, Louisiana 71115
| | - Alvaro Marín-Hernández
- the Department of Biochemistry, National Institute of Cardiology, Mexico City 14080, Mexico, and
| | - Luz Hernández-Esquivel
- the Department of Biochemistry, National Institute of Cardiology, Mexico City 14080, Mexico, and
| | - Sara Rodríguez-Enríquez
- the Department of Biochemistry, National Institute of Cardiology, Mexico City 14080, Mexico, and
| | - Jan Stursa
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague 14220, Czech Republic
| | - Paul K. Witting
- the Discipline of Pathology, Bosch Research Institute, Sydney Medical School, University of Sydney, Sydney 2006, New South Wales, Australia
| | - Bela Stantic
- Institute for Integrated and Intelligent Systems, and
| | | | | | | | - Jeffrey C. Dyason
- Institute for Glycomics, Griffith University, Southport 4222, Queensland, Australia
| | - Miroslav Ledvina
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague 14220, Czech Republic
| | - Brian A. Salvatore
- the Department of Chemistry and Physics, Louisiana State University, Shreveport, Louisiana 71115
| | - Rafael Moreno-Sánchez
- the Department of Biochemistry, National Institute of Cardiology, Mexico City 14080, Mexico, and
| | - Mark J. Coster
- the Eskitis Institute for Cell and Molecular Therapies, Griffith University, Nathan 4111, Queensland, Australia
| | | | - Robin A. J. Smith
- the Department of Chemistry, University of Otago, Dunedin 9016, New Zealand
| | - Jiri Neuzil
- From the School of Medical Science
- Institute for Glycomics, Griffith University, Southport 4222, Queensland, Australia
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Mašek J, Bartheldyová E, Turánek-Knotigová P, Skrabalová M, Korvasová Z, Plocková J, Koudelka S, Skodová P, Kulich P, Křupka M, Zachová K, Czerneková L, Horynová M, Kratochvílová I, Miller AD, Zýka D, Michálek J, Vrbková J, Sebela M, Ledvina M, Raška M, Turánek J. Metallochelating liposomes with associated lipophilised norAbuMDP as biocompatible platform for construction of vaccines with recombinant His-tagged antigens: preparation, structural study and immune response towards rHsp90. J Control Release 2011; 151:193-201. [PMID: 21256901 DOI: 10.1016/j.jconrel.2011.01.016] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2010] [Revised: 01/06/2011] [Accepted: 01/17/2011] [Indexed: 10/18/2022]
Abstract
Hsp90-CA is present in cell wall of Candida pseudohyphae or hyphae-typical pathogenic morphotype for both systemic and mucosal Candida infections. Heat shock protein from Candida albicans (hsp90-CA) is an important target for protective antibodies during disseminated candidiasis of experimental mice and human. His-tagged protein rHsp90 was prepared and used as the antigen for preparation of experimental recombinant liposomal vaccine. Nickel-chelating liposomes (the size around 100nm, PDI≤0.1) were prepared from the mixture of egg phosphatidyl choline and nickel-chelating lipid DOGS-NTA-Ni (molar ratio 95:5%) by hydration of lipid film and extrusion methods. New non-pyrogenic hydrophobised derivative of MDP (C18-O-6-norAbuMDP) was incorporated into liposomes as adjuvans. rHsp90 was attached onto the surface of metallochelating liposomes by metallochelating bond and the structure of these proteoliposomes was studied by dynamic light scattering, AF microscopy, TEM and GPC. The liposomes with surface-exposed C18-O-6-norAbuMDP were well recognised and phagocyted by human dendritic cells in vitro. In vivo the immune response towards this experimental vaccine applied in mice (i.d.) demonstrated both TH1 and TH2 response comparable to FCA, but without any side effects. Metallochelating liposomes with lipophilic derivatives of muramyl dipeptide represent a new biocompatible platform for construction of experimental recombinant vaccines and drug-targeting systems.
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Affiliation(s)
- Josef Mašek
- Department of Toxicology, Pharmacology and Immunotherapy, Veterinary Research Institute, Hudcova 70, Brno, Czech Republic
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Mašek J, Bartheldyová E, Korvasová Z, Škrabalová M, Koudelka Š, Kulich P, Kratochvílová I, Miller AD, Ledvina M, Raška M, Turánek J. Immobilization of histidine-tagged proteins on monodisperse metallochelation liposomes: Preparation and study of their structure. Anal Biochem 2011; 408:95-104. [DOI: 10.1016/j.ab.2010.08.023] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Revised: 08/02/2010] [Accepted: 08/16/2010] [Indexed: 12/22/2022]
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Kovalová A, Ledvina M, Saman D, Zyka D, Kubícková M, Zídek L, Sklenár V, Pompach P, Kavan D, Bílý J, Vanek O, Kubínková Z, Libigerová M, Ivanová L, Antolíková M, Mrázek H, Rozbeský D, Hofbauerová K, Kren V, Bezouska K. Synthetic N-acetyl-D-glucosamine based fully branched tetrasaccharide, a mimetic of the endogenous ligand for CD69, activates CD69+ killer lymphocytes upon dimerization via a hydrophilic flexible linker. J Med Chem 2010; 53:4050-65. [PMID: 20433142 DOI: 10.1021/jm100055b] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
On the basis of the highly branched ovomucoid-type undecasaccharide that had been shown previously to be an endogenous ligand for CD69 leukocyte receptor, a systematic investigation of smaller oligosaccharide mimetics was performed based on linear and branched N-acetyl-d-hexosamine homooligomers prepared synthetically using hitherto unexplored reaction schemes. The systematic structure-activity studies revealed the tetrasaccharide GlcNAcbeta1-3(GlcNAcbeta1-4)(GlcNAcbeta1-6)GlcNAc (compound 52) and its alpha-benzyl derivative 49 as the best ligand for CD69 with IC(50) as high as 10(-9) M. This compound thus approaches the affinity of the classical high-affinity neoglycoprotein ligand GlcNAc(23)BSA. Compound 68, GlcNAc tetrasaccharide 52 dimerized through a hydrophilic flexible linker, turned out to be effective in activating CD69(+) lymphocytes. It also proved efficient in enhancing natural killing in vitro, decreasing the growth of tumors in vivo, and activating the CD69(+) tumor infiltrating lymphocytes examined ex vivo. This compound is thus a candidate for carbohydrate-based immunomodulators with promising antitumor potential.
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Affiliation(s)
- Anna Kovalová
- Institute of Organic Chemistry and Biochemistry, VVI, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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Orság P, Kvardová V, Raska M, Miller AD, Ledvina M, Turánek J. Quantitative real-time PCR study on persistence of pDNA vaccine pVax-Hsp60 TM814 in beef muscles. Genet Vaccines Ther 2008; 6:11. [PMID: 18761754 PMCID: PMC2542361 DOI: 10.1186/1479-0556-6-11] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2008] [Accepted: 09/02/2008] [Indexed: 11/17/2022]
Abstract
Background Application of plasmid DNA for immunization of food-producing animals established new standards of food safety. The addition of foreign products e.g. pDNA into the food chain should be carefully examined to ensure that neither livestock animals nor consumers develop unpredicted or undesirable side-effects. Methods A quantitative real-time PCR (QRTPCR) methodology was developed to study the biodistribution and persistence of plasmid DNA vaccine pDNAX (pVAX-Hsp60 TM814) in mice and beef cattle. The linear quantification range and the sensitivity of the method was found to be 10 – 109 copies per reaction (500 ng/gDNA) and 3 copies per reaction, respectively. Results Persistence of pDNAX in mice muscle tissue was restricted to injection site and the amount of pDNAX showed delivery formulation dependent (naked pDNA, electroporation, cationic liposome complexes) and mouse age-dependent clearance form injection site but pDNAX was still detectable even after 365 days. The QRTPCR analysis of various muscle tissue samples of vaccinated beef bulls performed 242–292 days after the last revaccination proved that residual pDNAX was found only in the injection site. The highest plasmid levels (up to 290 copies per reaction) were detected in the pDNAX:CDAN/DOPE group similarly to mice model. No pDNA was detected in the samples from distant muscles and draining lymph nodes. Conclusion Quantitative real-time PCR (QRTPCR) assay was developed to assess the residual pDNA vaccine pVAX-Hsp60 TM814 in mice and beef cattle. In beef cattle, ultra low residual level of pDNA vaccine was only found at the injection site. According to rough estimation, consumption of muscles from the injection site represents almost an undetectable intake of pDNA (400 fg/g muscle tissue) for consumers. Residual plasmid in native state will hardly be found at measurable level following further meat processing. This study brings supportive data for animal and food safety and hence for further approval of pDNA vaccine field trials.
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Affiliation(s)
- Petr Orság
- Veterinary Research Institute, Department of Immunology, Brno, Czech Republic.
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Ledvina M, Turský M, Veselý J, Tišlerová I, Trnka T. Synthesis of a New Type ofd-Mannosamine Glycosyl Donor and Acceptor and their Use for the Preparation of Oligosaccharides Consisting ofd-Mannosamine Units Linked by α(1→4)-Glycosidic Bonds. SYNTHESIS-STUTTGART 2008. [DOI: 10.1055/s-2008-1067197] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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27
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Wang XF, Birringer M, Dong LF, Veprek P, Low P, Swettenham E, Stantic M, Yuan LH, Zobalova R, Wu K, Ledvina M, Ralph SJ, Neuzil J. A peptide conjugate of vitamin E succinate targets breast cancer cells with high ErbB2 expression. Cancer Res 2007; 67:3337-44. [PMID: 17409443 DOI: 10.1158/0008-5472.can-06-2480] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [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: 11/16/2022]
Abstract
Overexpression of erbB2 is associated with resistance to apoptosis. We explored whether high level of erbB2 expression by cancer cells allows their targeting using an erbB2-binding peptide (LTVSPWY) attached to the proapoptotic alpha-tocopheryl succinate (alpha-TOS). Treating erbB2-low or erbB2-high cells with alpha-TOS induced similar levels of apoptosis, whereas alpha-TOS-LTVSPWY induced greater levels of apoptosis in erbB2-high cells. alpha-TOS rapidly accumulated in erbB2-high cells exposed to alpha-TOS-LTVSPWY. The extent of apoptosis induced in erbB2-high cells by alpha-TOS-LTVSPWY was suppressed by erbB2 RNA interference as well as by inhibition of either endocytotic or lysosomal function. alpha-TOS-LTVSPWY reduced erbB2-high breast carcinomas in FVB/N c-neu transgenic mice. We conclude that a conjugate of a peptide targeting alpha-TOS to erbB2-overexpressing cancer cells induces rapid apoptosis and efficiently suppresses erbB2-positive breast tumors.
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Affiliation(s)
- Xiu-Fang Wang
- Apoptosis Research Group and Genomics Research Centre, School of Medical Science, Griffith University, Southport, Queensland, Australia
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Turánek J, Ledvina M, Kasná A, Vacek A, Hríbalova V, Krejcí J, Miller AD. Liposomal preparations of muramyl glycopeptides as immunomodulators and adjuvants. Vaccine 2006; 24 Suppl 2:S2-90-1. [PMID: 16823942 DOI: 10.1016/j.vaccine.2005.01.137] [Citation(s) in RCA: 11] [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] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The need for safe and structurally defined immunomodulators and adjuvants is increasing in connection with the recently observed marked increase in the prevalence of pathological conditions characterized by immunodeficiency. Important groups of such compounds are muramyl glycopeptides, analogs of muramyl dipeptide (MDP), glucosaminyl-muramyl dipeptide (GMDP), and desmuramylpeptides. We have designed and synthesized new types of analogs with changes in both the sugar and the peptide parts of the molecule that show a high immunostimulating and adjuvant activity and suppressed adverse side effects. The introduction of lipophilic residues has also improved their incorporation into liposomes, which represent a suitable drug carrier. The proliposome-liposome method is based on the conversion of the initial proliposome preparation into liposome dispersion by dilution with the aqueous phase. The description of a home-made stirred thermostated cell and its link-up with a liquid delivery system for a rapid and automated preparation of multilamellar liposomes at strictly controlled conditions (sterility, temperature, dilution rate and schedule) is presented. The cell has been designed for laboratory-scale preparation of liposomes (300-1000 mg of phospholipid per run) in a procedure taking less than 90 min. The method can be readily scaled up. Examples of adjuvant and immunostimulatory effect of liposomal preparation in mice model will be presented.
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Affiliation(s)
- Jaroslav Turánek
- Veterinary Research Institute, Hudcova 70, 62132 Brno, Czech Republic.
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Ledvina M, Veselý J, Rohlenová A, Džoganová M, Trnka T, Tišlerová I, Šaman D. Preparation of Ethyl 2-Azido-2-deoxy-1-thio-β-d-mannopyranosides, and their Rearrangement to 2-S-Ethyl-2-thio-β-d-mannopyranosylamines. SYNTHESIS-STUTTGART 2006. [DOI: 10.1055/s-2006-926297] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Turánek J, Kasná A, Koudela B, Ledvina M, Miller AD. Stimulation of innate immunity in newborn kids againstCryptosporidium parvuminfection-challenge by intranasal/per-oral administration of liposomal formulation of N-L18-norAbu-GMDP adjuvant. Parasitology 2005; 131:601-8. [PMID: 16255818 DOI: 10.1017/s0031182005007924] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2004] [Revised: 12/21/2004] [Accepted: 03/15/2005] [Indexed: 11/07/2022]
Abstract
The effects of a liposomal preparation of lipophilic immunomodulator β-D-GlcNstearoyl-(1-4)-norMurNAc-L-Abu-D-isoGln (N-L18-norAbu-GMDP) were investigated on resistance toCryptosporidium parvuminfection in neonatal kids. The liposomal preparation was administered subcutaneously or intranasally/orally (i.n./p.o.) twice at doses of 100 μg, 200 μg, or 1000 μg per kid pre-infection challenge. The treatment schemes were (i) 72 and 24 h pre-infection challenge, (ii) 24 h pre-infection challenge and 24 h post-infection challenge (oral inoculation with 1×107oocysts ofC. parvumin 5 ml of PBS). Administration of liposomal N-L18-norAbu-GMDP by i.n./p.o. route at the cumulative dose of 2000 μg per kid 72 and 24 h pre-infection challenge, lead to substantially increased clearance of coccidian parasites from various parts of the intestine. On the basis of histological examination, the distribution of cryptosporidia in the intestine and the severity of the infection, treated kids were classified on day 5 as having a strong reduction in infection in comparison to the control group (P<0·05). No cryptosporidia were found on the mucosal surface of treated kids by day 10, while the intestines of the control kids were still infected. All doses and routes of administration were judged effective with respect to suppression of cryptosporidia infections.
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Affiliation(s)
- J Turánek
- Veterinary Research Institute, Hudcova 70, 62132 Brno, Czech Republic.
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31
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Veselý J, Ledvina M, Jindřich J, Trnka T, Šaman D. Synthesis of 2-Amino-2-deoxy-β-D-galactopyranosyl-(1→4)-2-amino-2-deoxy-β-D-galactopyranosides: Using Various 2-Deoxy-2-phthalimido-D-galactopyranosyl Donors and Acceptors. ACTA ACUST UNITED AC 2004. [DOI: 10.1135/cccc20041914] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A systematic study is presented of the efficiency of the most common glycosylation methods using standard 2-deoxy-2-phthalimidogalactopyranosyl donors ethyl 4-O-acetyl-3,6-di-O- benzyl-2-deoxy-2-phthalimido-1-thio-β-D-galactopyranoside (3a), 4-O-Acetyl-3,6-di-O-benzyl- 2-deoxy-2-phthalimido-β-D-galactopyranosyl bromide (4), 4-O-acetyl-3,6-di-O-benzyl-2-deoxy-2-phthalimido-β-D-galactopyranosyl fluoride (5b), O-(4-O-acetyl-3,6-di-O-benzyl-2-deoxy-2-phthalimido-β-D-galactopyranosyl) trichloroacetimidate (7) and ethyl 3,6-di-O-benzyl-2-deoxy-2-phthalimido-1-thio-β-D-galactopyranoside (8), pent-4-enyl 3,6-di-O-benzyl- and 3-O-allyl-6-O-benzyl-2-deoxy-2-phthalimido-β-D-galactopyranoside (10a) and (10b) and pent-4-enyl 3,6-di-O-benzyl-2-deoxy-2-phthalimido-4-O-(trimethylsilyl)-β-D-galactopyranoside (11) as glycosyl acceptors in the synthesis of 2-amino-2-deoxy-β-D-galactopyranosyl-(1→4)-2-amino-2-deoxy-β-D-galactopyranosides 12, 16a and 17a. It was found that due to a low reactivity of the axial OH(4) group of glycosyl acceptors, disaccharides 16b and 17b with α(1→4) bond were also formed. The unexpected intermolecular migration of ethylsufanyl group from the reducing end of glycosyl acceptor 8 the reducing end of the activated form of glycosyl donor 4 in the glycosylation step to give ethylsulfanyl derivative 3a was proved. For preparation of the glycosyl donors and glycosyl acceptors with galacto configuration an approach based on epimerization of 4-O-mesyl derivatives of appropriate synthons with gluco configuration 2a and 2b was employed.
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Rohlenová A, Ledvina M, Šaman D, Bezouška K. Synthesis of Linear and Branched Regioisomeric Chitooligosaccharides as Potential Mimetics of Natural Oligosaccharide Ligands of Natural Killer Cells NKR-P1 and CD69 Lectin Receptors. ACTA ACUST UNITED AC 2004. [DOI: 10.1135/cccc20041781] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Regioisomer of chitobiose13with β(1→3) glycosidic bond and branched analog of chitotriose25having β(1→4) and β(1→3) glycosidic bonds, were prepared and tested as potential mimetics of natural oligosaccharide ligands for activating lectin receptors NKR-P1A and CD69 of natural killer (NK) cells. The structural requirements of NKR-P1 lectin receptor on effective mimetics of its natural ligands has been discussed. A significant binding activity of the branched trisaccharide25to the receptor CD69 was observed.
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Veselý J, Ledvina M, Jindřich J, Šaman D, Trnka T. Improved Synthesis of 1,2-trans-Acetates and 1,2-trans Ethyl 1-Thioglycosides Derived from 3,4,6-Tri-O-acetyl-2-deoxy-2-phthalimido-D-hexopyranosides. ACTA ACUST UNITED AC 2003. [DOI: 10.1135/cccc20031264] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Effective one-pot synthesis of 1,2-trans-acetates 4b, 5b and 6a derived from N-phthaloyl-protected D-glucosamine, D-galactosamine and D-mannosamine, respectively, is presented. Anomerisation of the corresponding 1,2-cis-acetates 4a, 5a and 6b and direct conversion of all of them to 1,2-trans ethyl 1-thioglycosides 7, 8 and 9 are also described and discussed.
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Ježek J, Velek J, Vepřek P, Velková V, Trnka T, Pecka J, Ledvina M, Vondrášek J, Písačka M. Solid phase synthesis of glycopeptide dendrimers with Tn antigenic structure and their biological activities. Part I. J Pept Sci 1999. [DOI: 10.1002/(sici)1099-1387(199901)5:1<46::aid-psc179>3.0.co;2-c] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Abstract
An innovative technique for corrosion testing of metallic dental materials is introduced. The thin electrolyte layer technique (TET) simulates the physical characteristics of the oral environment by employing a still, thin layer of an electrolyte, in contrast to bulk electrolyte techniques (BET) which utilize relatively large quantities of fluid. Limiting current density tests on a platinum electrode revealed a lower surface oxygen content for TET. Borate buffer (pH 6.8) was employed as an electrolyte. The effect of lower oxygen content in TET on passivation and polarization characteristics of 316L SS in 0.9% saline was investigated. The results revealed differences in the polarization resistance and open circuit potential development with time, as well as in anodic and cathodic polarization behavior. Lower O2 concentration in TET was attributed to different electrolyte convection characteristics under both testing conditions. Additionally, use of the TET resulted in better data reproducibility. Overall, this investigation led to a deeper understanding of the electrochemical processes inherent in thin electrolytes such as those found in the oral environment.
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Affiliation(s)
- M Ledvina
- Department of Materials and Mechanical Engineering, University of Alabama at Birmingham, USA
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Ledvina M, Zyka D, Ježek J, Trnka T, Šaman D. New Effective Synthesis of (N-Acetyl- and N-Stearoyl-2-amino-2-deoxy-β-D-glucopyranosyl)-(1→4)-N-acetylnormuramoyl-L-2-aminobutanoyl-D-isoglutamine, Analogs of GMDP with Immunopotentiating Activity. ACTA ACUST UNITED AC 1998. [DOI: 10.1135/cccc19980577] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Ethyl 3,4,6-tri-O-benzyl-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside (5), prepared by benzylation of ethyl 2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside (4), was transformed by reaction with bromine into 3,4,6-tri-O-benzyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl bromide (6). Thioglycoside 5 in the presence of methyl triflate and glycosylbromide 6 in the presence of silver triflate were used as glycosyl donors for condensation with benzyl 2-acetamido-3-O-allyl-6-O-benzyl-2-deoxy-α-D-glucopyranoside (7), to give benzyl 2-acetamido-3-O-allyl-6-O-benzyl-4-O-(3,4,6-tri-O-benzyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl)-2-deoxy-α-D-glucopyranoside (8). Its reductive dephthaloylation with NaBH4/AcOH afforded benzyl 2-acetamido-3-O-allyl-4-O-(2-amino-3,4,6-tri-O-benzyl-2-deoxy-β-D-glucopyranosyl)- 6-O-benzyl-2-deoxy-α-D-glucopyranoside (11). Compound 11 was N-acylated to give benzyl 2-acetamido-4-O-(2-acylamino-3,4,6-tri-O-benzyl-2-deoxy-β-D-glucopyranosyl)-3-O-allyl-6-O-benzyl-2-deoxy-α-D-glucopyranosides (12a) or (12b). These compounds were converted into corresponding benzyl 2-acetamido-4-O-(2-acylamino-3,4,6-tri-O-benzyl-2-deoxy-β-D-glucopyranosyl)-6-O-benzyl-3-O-carboxymethyl-2-deoxy-α-D-glucopyranosides which, by condensation with H-L-Abu-D-isoGln(OBzl) followed by hydrogenolysis of protective benzyl groups, furnished glycopeptides 16a and 16b. Intramolecular O→N migration of the allyl protecting group followed by its reduction to the propyl residue by reaction of compound 8 with hydrazine or hydrazinium acetate, to give benzyl 2-acetamido-4-O-(3,4,6-tri-O-benzyl-2-deoxy-2-propylamino-β-D-glucopyranosyl)-6-O-benzyl-2-deoxy-α-D-glucopyranoside (9), is also described.
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Ledvina M, Ježek J, Šaman D, Hříbalová V. Synthesis and Immunomodulating Activity of Lipophilic Analogs of N-Acetylnormuramoyl-L-2-aminobutanoyl-D-isoglutamine. ACTA ACUST UNITED AC 1998. [DOI: 10.1135/cccc19980590] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
N-Acetylnormuramoyl-L-2-aminobutanoyl-D-isoglutamine (7) and its lipophilic 6-O-octadecanoyl (8) and 6-O-(2-tetradecylhexadecanoyl) (9) derivatives were prepared and their immunoadjuvant activity and pyrogenicity were tested. Compounds 8 and 9 are less pyrogenic than muramoyl-dipeptide (MDP) and norMDP analog 7. Both lipophilic derivatives 8 and 9 are better adjuvants than MDP in cell mediated immunity.
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Turánek J, Záluská D, Hofer M, Vacek A, Ledvina M, Jezek J. Stimulation of haemopoiesis and protection of mice against radiation injury by synthetic analogues of muramyldipeptide incorporated in liposomes. Int J Immunopharmacol 1997; 19:611-7. [PMID: 9637362 DOI: 10.1016/s0192-0561(98)00003-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Protection from undesirable effects of radiotherapy or chemotherapy, primarily from myelosuppression, remains still a crucial problem to be studied. Attention has been therefore paid to various immunomodulatory agents that through the monocyte/macrophage system induced production of cytokines, which can induce and operate restoration of haemopoiesis and thus act radioprotectively. Some synthetic analogues of MDP free of undesirable side-effects, were synthesized in the Czech Republic. Lipophilic beta-D-GlcNstearoyl-(1- > 4)-norMurNAc-L-Abu-D-isoGln (DDD-St) was designed to be easily entrapped into liposomes and this liposomal DDD-St protected efficiently mice against irradiation, when administered i.p., i.v. or s.c. 24 h prior to lethal irradiation (survival rate in the range of 30-80% compared with 0% in control). Especially the subcutaneous application of liposomal DDD-St was very efficient. The parameters characteristic of recovery of haemopoiesis in bone marrow on day 10 after 6.5 Gy irradiation were significantly improved in comparison with the controls. Very high radioprotective effect of s.c. administered liposomal DDD-St can be explained (together with induction of haemopoiesis) by an effective and long-lasting activation of nonspecific immunity, which is able to withhold an onset of septicemia in early days after irradiation. In conclusion, the liposomal DDD-St should be therapeutically beneficial in moderating the haemopoietic damage, which is an undesirable effect of radiotherapy or chemotherapy.
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Affiliation(s)
- J Turánek
- Veterinary Research Institute, Brno, Czech Republic
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Sharma M, Li YX, Ledvina M, Bobek M. Synthesis of 5′-Fluoro-5′-deoxy-and 5′-Amino-5′-Deoxytoyocamycin and Sangivamycin and Some Related Derivatives. ACTA ACUST UNITED AC 1995. [DOI: 10.1080/15257779508010707] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Ledvina M, Jezek J, Saman D, Vaisar T, Hríbalová V. Synthesis of O-[2-acetamido-2-deoxy-6-O-stearoyl- and -6-O-(2-tetradecylhexadecanoyl)-beta-D-glucopyranosyl]-(1-->4)-N- acetylnormuramoyl-L-alpha-aminobutanoyl-D-isoglutamine, lipophilic disaccharide analogues of MDP. Carbohydr Res 1994; 251:269-84. [PMID: 8149375 DOI: 10.1016/0008-6215(94)84291-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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: 01/29/2023]
Abstract
Silver triflate-promoted condensation of 3,4,6-tri-O-acetyl-2-deoxy-2- phthalimido-beta-D-glucopyranosyl bromide (1) with benzyl 2-acetamido-6-O-benzyl-2-deoxy-3-O- (methoxycarbonyl)methyl-alpha-D-glucopyranoside (4) afforded the key compound, benzyl 2-acetamido-6-O-benzyl-2-deoxy-3-O- (methoxy-carbonyl)methyl-4-O-(3,4,6-tri-O-acetyl-2-deoxy-2-phthalimido-b eta-D- glucopyranosyl)-alpha-D-glucopyranoside (5), which after deprotection was transformed into acid 10. Condensation of 10 with the benzyl ester of L-alpha-aminobutanoyl-D-isoglutamine and deisopropylidenation of the product 11 afforded the benzyl ester of N-(2-O-[benzyl 2-acetamido-4-O-(2-acetamido-3-O-benzyloxymethyl-2- deoxy-beta-D-glucopyranosyl)-6-O-benzyl-2,3-dideoxy-alpha-D-glucopyra nosid-3- yl]glycoloyl)-L-alpha-aminobutanoyl-D-isoglutamine (12). Partial O-acylation of 12 and hydrogenolysis of protecting groups gave the 6-O-stearoyl- and 6-O-(2-tetradecylhexadecanoyl)-disaccharide-dipeptides 17 and 18, respectively. Pyrogenicity and adjuvant activity in cell-mediated immunity are reported.
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Affiliation(s)
- M Ledvina
- Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, Prague
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Ledvina M. [Prof. Jan Horbaczewski. On the 50th anniversary of his death]. Cas Lek Cesk 1992; 131:347. [PMID: 1638604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Ledvina M, Šaman D, Ježek J. Synthesis of O-(2-Deoxy-2-stearoylamino-β-D-glucopyranosyl)-(1→4)-N-acetylnormuramoyl-L-α-aminobutanoyl-D-isoglutamine, a Lipophilic Disaccharide Analogue of MDP. ACTA ACUST UNITED AC 1992. [DOI: 10.1135/cccc19920579] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Partial N-deacetylation of compound II with barium hydroxide afforded benzyl 2-acetamido-3-O-allyl-4-O-(2-amino-2-deoxy-4,6-O-isopropylidene-β-D-glucopyranosyl)-6-O,-benzyl-2-deoxy-α-D-glucopyranoside (III) in high yield. Compound III was N-acylated with stearic acid in the presence of DCC and the obtained product was converted into benzyl 2-acetamido-6-O-benzyl-3-O-carboxymethyl-2-deoxy-4-O-(3,4,6-tri-O-benzyl-2-deoxy-2-stearoylamino-β-D-glucopyranosyl)-α-D-glucopyranoside (VII). Coupling of compound VII with L-α-aminobutanoyl-D-isoglutamine benzyl ester followed by hydrogenolysis of the product VIII afforded compound IX.
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Ledvina M, Farkaš J, Zajíček J, Ježek J, Zaoral M. An alternative synthesis of O-(2-acetamido-2-deoxy-β-D-glucopyranosyl)-(1→4)-N-acetylnormuramoyl-L-α-aminobutanoyl-D-isoglutamine. ACTA ACUST UNITED AC 1989. [DOI: 10.1135/cccc19892784] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Silver triflate-promoted condensation of 3,4,6-tri-O-acetyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl bromide (VIII) with benzyl 2-acetamido-6-O-benzoyl-2-deoxy-3-O-(methoxycarbonyl)-methyl-α-D-glucopyranoside (IV) afforded benzyl 2-acetamido-4-O-(3,4,6-tri-O-acetyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl)-6-O-benzoyl-2-deoxy-3-O-(methoxycarbonyl)methyl-α-D-glucopyranoside (IX) which, after deprotection, was converted into the acid XI. Condensation of acid XI with L-α-aminobutanoyl-D-isoglutamine benzyl ester and subsequent hydrogenolysis of the product XIII furnished compound XIV. Benzyl 2-acetamido-6-O-benzoyl-2-deoxy-3-O-(methoxycarbonyl)methyl-α-D-glucopyranoside (IV) was prepared by partial benzoylation of benzyl 2-acetamido-2-deoxy-3-O-(methoxycarbonyl)methyl-α-D-glucopyranoside (III) with benzoyl cyanide.
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Farkaš J, Ledvina M, Brokeš J, Ježek J, Zajíček J, Zaoral M. The synthesis of O-(2-acetamido-2-deoxy-β-d-glucopyranosyl)-(1→4)-N-acetylnormuramoyl-l-α-aminobutanoyl-d-isoglutamine. Carbohydr Res 1987. [DOI: 10.1016/0008-6215(87)80165-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Abstract
Collagen-like structures were formed in solutions of alpha-elastin after heating to 57 degrees C and after treatment with absolute ethanol. A complex between acetyl-alpha-elastin and cetyltrimethylammonium bromide showed a similar structure. Thick fibrils (diameter approximately 100 nm), resembling those described by Volpin, et al.12 revealed transversal banding with periodicity of 39 to 62 nm. A possible mechanism for the formation of these fibers is suggested based on hydrophobic interactions.
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Abstract
alpha-Elastin methylester forms with proteoglycan subunits and structural glycoproteins water-insoluble complexes which after staining with phosphotungstic acid (pH 7.0), reveal at large magnification bundles of slender smooth fibrils with a diameter from 4 to 5 nm. Similar fibrils can be observed after interaction of alpha-elastin methylester with chondroitin sulfate, but only if fixation with glutaraldehyde is used prior to staining. Phosphotungstic acid alters the organization of the complexes, in particular those formed with ligands of low molecular weight. The possible biological significance of the interactions studied is discussed.
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Ledvina M, Farkaš J. Alternative synthesis of 4-methyl-2H-1,2,6-thiadiazin-3(6H)-one 1,1-dioxide, a structural analogue of thymine. ACTA ACUST UNITED AC 1984. [DOI: 10.1135/cccc19840840] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
N-Alkylsulfamides react with methyl 3-methoxy-2-methyl-2-propenoate (XI) in aqueous hydrochloric acid under formation of methyl 3-(N' -alkylsulfamido)-2-methyl-2-propenoates (VIIa to VIIc). Attempted base-catalyzed cyclization of the ester VIIb was unsuccessful. The 2-benzyl derivative IV and the 6-benzyl derivative V were prepared by reaction of iodotrimethylsilane with the acid VIII and the amide IX, respectively. Hydrogenolytic removal of the benzyl groups in the 2- and 6-benzyl derivatives IV and V afforded the title compound III.
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Benesová-Půlpánová J, Ledvina M. [The efect of ionizing radiation and fasting on the excretion of o-iodobenzoic acid 125I and its conjugates in the urine of rats protected by radioprotective agents]. Sb Ved Pr Lek Fak Karlovy Univerzity Hradci Kralove Suppl 1983; 26:201-215. [PMID: 6335783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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Krízala J, Stoklasová A, Kovárovă H, Ledvina M. The effect of gamma irradiation and cystamine on superoxide dismutase activity in the bone marrow and erythrocytes of rats. Radiat Res 1982; 91:507-15. [PMID: 6750680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Kr̈íz̆ala J, Stoklasová A, Kovár̆ová H, Ledvina M, Krizala J, Stoklasova A, Kovarova H. The Effect of γ Irradiation and Cystamine on Superoxide Dismutase Activity in the Bone Marrow and Erythrocytes of Rats. Radiat Res 1982. [DOI: 10.2307/3575888] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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