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  1. Article ; Online: Synthesis and In Vitro Study of Antiviral Activity of Glycyrrhizin Nicotinate Derivatives against HIV-1 Pseudoviruses and SARS-CoV-2 Viruses

    Vladislav V. Fomenko / Nadezhda B. Rudometova / Olga I. Yarovaya / Artem D. Rogachev / Anastasia A. Fando / Anna V. Zaykovskaya / Nina I. Komarova / Dmitry N. Shcherbakov / Oleg V. Pyankov / Andrey G. Pokrovsky / Larisa I. Karpenko / Rinat A. Maksyutov / Nariman F. Salakhutdinov

    Molecules, Vol 27, Iss 295, p

    2022  Volume 295

    Abstract: When developing drugs against SARS-CoV-2, it is important to consider the characteristics of patients with different co-morbidities. People infected with HIV-1 are a particularly vulnerable group, as they may be at a higher risk than the general ... ...

    Abstract When developing drugs against SARS-CoV-2, it is important to consider the characteristics of patients with different co-morbidities. People infected with HIV-1 are a particularly vulnerable group, as they may be at a higher risk than the general population of contracting COVID-19 with clinical complications. For such patients, drugs with a broad spectrum of antiviral activity are of paramount importance. Glycyrrhizinic acid (Glyc) and its derivatives are promising biologically active compounds for the development of such broad-spectrum antiviral agents. In this work, derivatives of Glyc obtained by acylation with nicotinic acid were investigated. The resulting preparation, Glycyvir, is a multi-component mixture containing mainly mono-, di-, tri- and tetranicotinates. The composition of Glycyvir was characterized by HPLC-MS/MS and its toxicity assessed in cell culture. Antiviral activity against three strains of SARS-CoV-2 was tested in vitro on Vero E6 cells by MTT assay. Glycyvir was shown to inhibit SARS-CoV-2 replication in vitro (IC 50 2–8 μM) with an antiviral activity comparable to the control drug Remdesivir. In addition, Glycyvir exhibited marked inhibitory activity against HIV pseudoviruses of subtypes B, A6 and the recombinant form CRF63_02A (IC 50 range 3.9–27.5 µM). The time-dependence of Glycyvir inhibitory activity on HIV pseudovirus infection of TZM-bl cells suggested that the compound interfered with virus entry into the target cell. Glycyvir is a promising candidate as an agent with low toxicity and a broad spectrum of antiviral action.
    Keywords human immunodeficiency virus type 1 ; SARS-CoV-2 ; entry inhibitors ; nicotinates of glycyrrhizic acid ; Organic chemistry ; QD241-441
    Subject code 570
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Comparative Immunogenicity of the Recombinant Receptor-Binding Domain of Protein S SARS-CoV-2 Obtained in Prokaryotic and Mammalian Expression Systems

    Iuliia A. Merkuleva / Dmitry N. Shcherbakov / Mariya B. Borgoyakova / Daniil V. Shanshin / Andrey P. Rudometov / Larisa I. Karpenko / Svetlana V. Belenkaya / Anastasiya A. Isaeva / Valentina S. Nesmeyanova / Elena I. Kazachinskaia / Ekaterina A. Volosnikova / Tatiana I. Esina / Anna V. Zaykovskaya / Oleg V. Pyankov / Sophia S. Borisevich / Arseniya A. Shelemba / Anton N. Chikaev / Alexander A. Ilyichev

    Vaccines, Vol 10, Iss 96, p

    2022  Volume 96

    Abstract: The receptor-binding domain (RBD) of the protein S SARS-CoV-2 is considered to be one of the appealing targets for developing a vaccine against COVID-19. The choice of an expression system is essential when developing subunit vaccines, as it ensures the ... ...

    Abstract The receptor-binding domain (RBD) of the protein S SARS-CoV-2 is considered to be one of the appealing targets for developing a vaccine against COVID-19. The choice of an expression system is essential when developing subunit vaccines, as it ensures the effective synthesis of the correctly folded target protein, and maintains its antigenic and immunogenic properties. Here, we describe the production of a recombinant RBD protein using prokaryotic (pRBD) and mammalian (mRBD) expression systems, and compare the immunogenicity of prokaryotic and mammalian-expressed RBD using a BALB/c mice model. An analysis of the sera from mice immunized with both variants of the protein revealed that the mRBD expressed in CHO cells provides a significantly stronger humoral immune response compared with the RBD expressed in E.coli cells. A specific antibody titer of sera from mice immunized with mRBD was ten-fold higher than the sera from the mice that received pRBD in ELISA, and about 100-fold higher in a neutralization test. The data obtained suggests that mRBD is capable of inducing neutralizing antibodies against SARS-CoV-2.
    Keywords SARS-CoV-2 ; COVID-19 ; subunit vaccines ; S protein ; receptor-binding domain ; Medicine ; R
    Subject code 570
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Synthesis and Antiviral Activity of Camphene Derivatives against Different Types of Viruses

    Anastasiya S. Sokolova / Valentina P. Putilova / Olga I. Yarovaya / Anastasiya V. Zybkina / Ekaterina D. Mordvinova / Anna V. Zaykovskaya / Dmitriy N. Shcherbakov / Iana R. Orshanskaya / Ekaterina O. Sinegubova / Iana L. Esaulkova / Sophia S. Borisevich / Nikolay I. Bormotov / Larisa N. Shishkina / Vladimir V. Zarubaev / Oleg V. Pyankov / Rinat A. Maksyutov / Nariman F. Salakhutdinov

    Molecules, Vol 26, Iss 2235, p

    2021  Volume 2235

    Abstract: To date, the ‘one bug-one drug’ approach to antiviral drug development cannot effectively respond to the constant threat posed by an increasing diversity of viruses causing outbreaks of viral infections that turn out to be pathogenic for humans. ... ...

    Abstract To date, the ‘one bug-one drug’ approach to antiviral drug development cannot effectively respond to the constant threat posed by an increasing diversity of viruses causing outbreaks of viral infections that turn out to be pathogenic for humans. Evidently, there is an urgent need for new strategies to develop efficient antiviral agents with broad-spectrum activities. In this paper, we identified camphene derivatives that showed broad antiviral activities in vitro against a panel of enveloped pathogenic viruses, including influenza virus A/PR/8/34 (H1N1), Ebola virus (EBOV), and the Hantaan virus. The lead-compound 2a , with pyrrolidine cycle in its structure, displayed antiviral activity against influenza virus (IC 50 = 45.3 µM), Ebola pseudotype viruses (IC 50 = 0.12 µM), and authentic EBOV (IC 50 = 18.3 µM), as well as against pseudoviruses with Hantaan virus Gn-Gc glycoprotein (IC 50 = 9.1 µM). The results of antiviral activity studies using pseudotype viruses and molecular modeling suggest that surface proteins of the viruses required for the fusion process between viral and cellular membranes are the likely target of compound 2a . The key structural fragments responsible for efficient binding are the bicyclic natural framework and the nitrogen atom. These data encourage us to conduct further investigations using bicyclic monoterpenoids as a scaffold for the rational design of membrane-fusion targeting inhibitors.
    Keywords camphen ; antiviral agent ; surface protein ; pseudotype viruses ; molecular docking ; Organic chemistry ; QD241-441
    Subject code 500
    Language English
    Publishing date 2021-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Delivery of mRNA Vaccine against SARS-CoV-2 Using a Polyglucin:Spermidine Conjugate

    Larisa I. Karpenko / Andrey P. Rudometov / Sergei V. Sharabrin / Dmitry N. Shcherbakov / Mariya B. Borgoyakova / Sergei I. Bazhan / Ekaterina A. Volosnikova / Nadezhda B. Rudometova / Lyubov A. Orlova / Inna A. Pyshnaya / Boris N. Zaitsev / Natalya V. Volkova / Mamedyar Sh. Azaev / Anna V. Zaykovskaya / Oleg V. Pyankov / Alexander A. Ilyichev

    Vaccines, Vol 9, Iss 2, p

    2021  Volume 76

    Abstract: One of the key stages in the development of mRNA vaccines is their delivery. Along with liposome, other materials are being developed for mRNA delivery that can ensure both the safety and effectiveness of the vaccine, and also facilitate its storage and ... ...

    Abstract One of the key stages in the development of mRNA vaccines is their delivery. Along with liposome, other materials are being developed for mRNA delivery that can ensure both the safety and effectiveness of the vaccine, and also facilitate its storage and transportation. In this study, we investigated the polyglucin:spermidine conjugate as a carrier of an mRNA-RBD vaccine encoding the receptor binding domain (RBD) of the SARS-CoV-2 spike protein. The conditions for the self-assembling of mRNA-PGS complexes were optimized, including the selection of the mRNA:PGS charge ratios. Using dynamic and electrophoretic light scattering it was shown that the most monodisperse suspension of nanoparticles was formed at the mRNA:PGS charge ratio equal to 1:5. The average hydrodynamic particles diameter was determined, and it was confirmed by electron microscopy. The evaluation of the zeta potential of the investigated complexes showed that the particles surface charge was close to the zero point. This may indicate that the positively charged PGS conjugate has completely packed the negatively charged mRNA molecules. It has been shown that the packaging of mRNA-RBD into the PGS envelope leads to increased production of specific antibodies with virus-neutralizing activity in immunized BALB/c mice. Our results showed that the proposed polycationic polyglucin:spermidine conjugate can be considered a promising and safe means to the delivery of mRNA vaccines, in particular mRNA vaccines against SARS-CoV-2.
    Keywords SARS-CoV-2 ; RBD ; mRNA-vaccine ; polyglucin:spermidine conjugate ; anti-RBD antibodies ; Medicine ; R
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Self-Assembled Particles Combining SARS-CoV-2 RBD Protein and RBD DNA Vaccine Induce Synergistic Enhancement of the Humoral Response in Mice

    Mariya B. Borgoyakova / Larisa I. Karpenko / Andrey P. Rudometov / Ekaterina A. Volosnikova / Iuliia A. Merkuleva / Ekaterina V. Starostina / Alexey M. Zadorozhny / Anastasiya A. Isaeva / Valentina S. Nesmeyanova / Daniil V. Shanshin / Konstantin O. Baranov / Natalya V. Volkova / Boris N. Zaitsev / Lyubov A. Orlova / Anna V. Zaykovskaya / Oleg V. Pyankov / Elena D. Danilenko / Sergei I. Bazhan / Dmitry N. Shcherbakov /
    Alexander V. Taranin / Alexander A. Ilyichev

    International Journal of Molecular Sciences, Vol 23, Iss 2188, p

    2022  Volume 2188

    Abstract: Despite the fact that a range of vaccines against COVID-19 have already been created and are used for mass vaccination, the development of effective, safe, technological, and affordable vaccines continues. We have designed a vaccine that combines the ... ...

    Abstract Despite the fact that a range of vaccines against COVID-19 have already been created and are used for mass vaccination, the development of effective, safe, technological, and affordable vaccines continues. We have designed a vaccine that combines the recombinant protein and DNA vaccine approaches in a self-assembled particle. The receptor-binding domain (RBD) of the spike protein of SARS-CoV-2 was conjugated to polyglucin:spermidine and mixed with DNA vaccine (pVAXrbd), which led to the formation of particles of combined coronavirus vaccine (CCV-RBD) that contain the DNA vaccine inside and RBD protein on the surface. CCV-RBD particles were characterized with gel filtration, electron microscopy, and biolayer interferometry. To investigate the immunogenicity of the combined vaccine and its components, mice were immunized with the DNA vaccine pVAXrbd or RBD protein as well as CCV-RBD particles. The highest antigen-specific IgG and neutralizing activity were induced by CCV-RBD, and the level of antibodies induced by DNA or RBD alone was significantly lower. The cellular immune response was detected only in the case of DNA or CCV-RBD vaccination. These results demonstrate that a combination of DNA vaccine and RBD protein in one construct synergistically increases the humoral response to RBD protein in mice.
    Keywords SARS-CoV-2 ; self-assembled particles ; RBD protein ; DNA vaccine ; humoral response ; virus-neutralizing activity ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Subject code 612
    Language English
    Publishing date 2022-02-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Avian Influenza (H5N1) Outbreak among Wild Birds, Russia, 2009

    Kirill Sharshov / Nikita Silko / Ivan Sousloparov / Anna V. Zaykovskaya / Aleksander Shestopalov / Ilia Drozdov

    Emerging Infectious Diseases, Vol 16, Iss 2, Pp 349-

    2010  Volume 351

    Keywords Avian influenza ; H5N1 ; outbreak ; wild birds ; viruses ; Russia ; Medicine ; R ; Infectious and parasitic diseases ; RC109-216
    Language English
    Publishing date 2010-02-01T00:00:00Z
    Publisher Centers for Disease Control and Prevention
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Influenza (H5N1) Viruses in Poultry, Russian Federation, 2005–2006

    Aleksandr S. Lipatov / Vasily A. Evseenko / Hong Wang / Anna V. Zaykovskaya / Alexander G. Durimanov / Sergey I. Zolotykh / Sergey V. Netesov / Ilya G. Drozdov / Gennadiy G. Onishchenko / Robert G. Webster / Alexander M. Shestopalov

    Emerging Infectious Diseases, Vol 13, Iss 4, Pp 539-

    2007  Volume 539

    Abstract: We studied 7 influenza (H5N1) viruses isolated from poultry in western Siberia and the European part of the Russian Federation during July 2005–February 2006. Full genome sequences showed high homology to Qinghai-like influenza (H5N1) viruses. ... ...

    Abstract We studied 7 influenza (H5N1) viruses isolated from poultry in western Siberia and the European part of the Russian Federation during July 2005–February 2006. Full genome sequences showed high homology to Qinghai-like influenza (H5N1) viruses. Phylogenetic analysis not only showed a close genetic relationship between the H5N1 strains isolated from poultry and wild migratory waterfowls but also suggested genetic reassortment among the analyzed isolates. Analysis of deduced amino acid sequences of the M2 and neuraminidase proteins showed that all isolates are potentially sensitive to currently available antiviral drugs. Pathogenicity testing showed that all studied viruses were highly pathogenic in chickens; for 3 isolates tested in mice and 2 tested in ferrets, pathogenicity was heterogeneous. Pathogenicity in mammalian models was generally correlated with Lys at residue 627 of polymerase basic protein 2.
    Keywords Influenza viruses ; H5N1 ; Russia ; poultry ; pathogenicity ; research ; Medicine ; R ; Infectious and parasitic diseases ; RC109-216
    Language English
    Publishing date 2007-04-01T00:00:00Z
    Publisher Centers for Disease Control and Prevention
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: H5N1 Influenza Virus, Domestic Birds, Western Siberia, Russia

    Alexander Shestopalov / Alexander G. Durimanov / Vasily A. Evseenko / Vladimir A. Ternovoi / Yury. N. Rassadkin / Yulya V. Razumova / Anna V. Zaykovskaya / Sergey I. Zolotykh / Sergey V. Netesov

    Emerging Infectious Diseases, Vol 12, Iss 7, Pp 1167-

    2006  Volume 1169

    Keywords Avian influenza ; H5N1 ; influenza ; domestic birds ; Siberia ; letter ; Medicine ; R ; Infectious and parasitic diseases ; RC109-216
    Language English
    Publishing date 2006-07-01T00:00:00Z
    Publisher Centers for Disease Control and Prevention
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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