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  1. Article ; Online: New directions in the experimental therapy of tick-borne encephalitis.

    Eyer, Ludek / Seley-Radtke, Katherine / Ruzek, Daniel

    Antiviral research

    2022  Volume 210, Page(s) 105504

    Abstract: Tick-borne encephalitis (TBE) is a potentially fatal disease common in much of Europe and Asia. There is no specific therapy for the treatment of TBE patients. However, several efforts are being made to develop small molecules that specifically interfere ...

    Abstract Tick-borne encephalitis (TBE) is a potentially fatal disease common in much of Europe and Asia. There is no specific therapy for the treatment of TBE patients. However, several efforts are being made to develop small molecules that specifically interfere with the life cycle of TBE virus. In particular, recently various nucleoside analogues that can inhibit the viral replicase, such as the RNA-dependent RNA polymerase or viral methyltransferases, have been explored. In addition, human or chimeric (i.e., structural chimeras that combine mouse variable domains with human constant domains) monoclonal antibodies with promising potential for post-exposure prophylaxis or early therapy have been developed. This review summarizes the latest directions and experimental approaches that may be used to combat TBE in humans.
    MeSH term(s) Humans ; Animals ; Mice ; Encephalitis, Tick-Borne ; Europe ; Asia ; Therapies, Investigational ; Encephalitis Viruses, Tick-Borne
    Language English
    Publishing date 2022-12-24
    Publishing country Netherlands
    Document type Review ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 306628-9
    ISSN 1872-9096 ; 0166-3542
    ISSN (online) 1872-9096
    ISSN 0166-3542
    DOI 10.1016/j.antiviral.2022.105504
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Development of recombinant West Nile virus expressing mCherry reporter protein.

    Kobayashi, Shintaro / Fukuda, Yukine / Yoshii, Kentaro / Thammahakin, Passawat / Maezono, Keisuke / Eyer, Luděk / Růžek, Daniel / Kariwa, Hiroaki

    Journal of virological methods

    2023  Volume 317, Page(s) 114744

    Abstract: West Nile virus (WNV) is transmitted to humans and animals by a mosquito and enters the central nervous system, leading to lethal encephalitis. Reporter viruses expressing fluorescent proteins enable detection of infected cells in vitro and in vivo, ... ...

    Abstract West Nile virus (WNV) is transmitted to humans and animals by a mosquito and enters the central nervous system, leading to lethal encephalitis. Reporter viruses expressing fluorescent proteins enable detection of infected cells in vitro and in vivo, facilitating evaluation of the dynamics of viral infection, and the development of diagnostic or therapeutic methods. In this study, we developed a method for production of a recombinant replication-competent WNV expressing mCherry fluorescent protein. The expression of mCherry was observed in viral antigen-positive cells in vitro and in vivo, but the growth of the reporter WNV was reduced as compared to the parental WNV. The expression of mCherry was stable during 5 passages in reporter WNV-infected culture cells. Neurological symptoms were observed in mice inoculated intracranially with the reporter WNV. The reporter WNV expressing mCherry will facilitate research into WNV replication in mouse brains.
    MeSH term(s) Humans ; Mice ; Animals ; West Nile virus/genetics ; West Nile Fever/veterinary ; Recombinant Proteins/genetics
    Chemical Substances Recombinant Proteins
    Language English
    Publishing date 2023-04-28
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 8013-5
    ISSN 1879-0984 ; 0166-0934
    ISSN (online) 1879-0984
    ISSN 0166-0934
    DOI 10.1016/j.jviromet.2023.114744
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Antiviral Activity of Vacuolar ATPase Blocker Diphyllin against SARS-CoV-2

    Stefanik, Michal / Strakova, Petra / Haviernik, Jan / Miller, Andrew D. / Ruzek, Daniel / Eyer, Ludek

    Microorganisms. 2021 Feb. 25, v. 9, no. 3

    2021  

    Abstract: Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) is a causative agent of the pandemic coronavirus disease 2019 (COVID-19), which has resulted in over two million deaths worldwide to date. Diphyllin and diphyllinosides are known as natural ... ...

    Abstract Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) is a causative agent of the pandemic coronavirus disease 2019 (COVID-19), which has resulted in over two million deaths worldwide to date. Diphyllin and diphyllinosides are known as natural blockers of cellular vacuolar ATPases, and so can act as inhibitors of the pH-dependent fusion of viral envelopes with host cell endosomal membranes. Such pH-dependent fusion is a critical early step during the SARS-CoV-2 replication cycle. Accordingly, the anti-SARS-CoV-2 profiles and cytotoxicities of diphyllin, diphyllinoside cleistanthin B, and two structurally related compounds, helioxanthin 8-1 and helioxanthin 5-4-2, are evaluated here using in vitro cell-based assay systems. Neither helioxanthin exhibits any obvious anti-SARS-CoV-2 effects in vitro. By contrast diphyllin and cleistanthin B do exhibit anti-SARS-CoV-2 effects in Vero cells, with respective 50% effective concentrations (EC₅₀) values of 1.92 and 6.51 µM. Diphyllin displays anti-SARS-CoV-2 effect also in colorectal adenocarcinoma (CaCo-2) cells. Moreover, when diphyllin is added at various times post infection, a significant decrease in viral titer is observed in SARS-CoV-2-infected Vero cells, even at high viral multiplicities of infection. Importantly, neither diphyllin nor cleistanthin B are found cytotoxic to Vero cells in concentrations up to 100 µM. However, the cytotoxic effect of diphyllin is more pronounced in Vero E6 and CaCo-2 cells. Overall, our data demonstrate that diphyllin and diphyllin analogues might be perfected as anti-SARS-CoV-2 agents in future preclinical studies, most especially if nanomedicine approaches may be invoked to optimize functional drug delivery to virus infected cells.
    Keywords COVID-19 infection ; H-transporting ATP synthase ; Severe acute respiratory syndrome coronavirus 2 ; adenocarcinoma ; adenosinetriphosphatase ; antiviral properties ; cytotoxicity ; drugs ; etiological agents ; nanomedicine ; pH ; pandemic ; vacuoles ; viral load ; viruses
    Language English
    Dates of publication 2021-0225
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2720891-6
    ISSN 2076-2607
    ISSN 2076-2607
    DOI 10.3390/microorganisms9030471
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Antiviral Activity of Vacuolar ATPase Blocker Diphyllin against SARS-CoV-2.

    Stefanik, Michal / Strakova, Petra / Haviernik, Jan / Miller, Andrew D / Ruzek, Daniel / Eyer, Ludek

    Microorganisms

    2021  Volume 9, Issue 3

    Abstract: Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) is a causative agent of the pandemic coronavirus disease 2019 (COVID-19), which has resulted in over two million deaths worldwide to date. Diphyllin and diphyllinosides are known as natural ... ...

    Abstract Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) is a causative agent of the pandemic coronavirus disease 2019 (COVID-19), which has resulted in over two million deaths worldwide to date. Diphyllin and diphyllinosides are known as natural blockers of cellular vacuolar ATPases, and so can act as inhibitors of the pH-dependent fusion of viral envelopes with host cell endosomal membranes. Such pH-dependent fusion is a critical early step during the SARS-CoV-2 replication cycle. Accordingly, the anti-SARS-CoV-2 profiles and cytotoxicities of diphyllin, diphyllinoside cleistanthin B, and two structurally related compounds, helioxanthin 8-1 and helioxanthin 5-4-2, are evaluated here using in vitro cell-based assay systems. Neither helioxanthin exhibits any obvious anti-SARS-CoV-2 effects in vitro. By contrast diphyllin and cleistanthin B do exhibit anti-SARS-CoV-2 effects in Vero cells, with respective 50% effective concentrations (EC
    Language English
    Publishing date 2021-02-25
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2720891-6
    ISSN 2076-2607
    ISSN 2076-2607
    DOI 10.3390/microorganisms9030471
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Antiviral activity of porphyrins and porphyrin-like compounds against tick-borne encephalitis virus: Blockage of the viral entry/fusion machinery by photosensitization-mediated destruction of the viral envelope.

    Holoubek, Jiří / Salát, Jiří / Kotouček, Jan / Kastl, Tomáš / Vancová, Marie / Huvarová, Ivana / Bednář, Petr / Bednářová, Klára / Růžek, Daniel / Renčiuk, Daniel / Eyer, Luděk

    Antiviral research

    2023  Volume 221, Page(s) 105767

    Abstract: Tick-borne encephalitis virus (TBEV), the causative agent of tick-borne encephalitis (TBE), is a medically important flavivirus endemic to the European-Asian continent. Although more than 12,000 clinical cases are reported annually worldwide, there is no ...

    Abstract Tick-borne encephalitis virus (TBEV), the causative agent of tick-borne encephalitis (TBE), is a medically important flavivirus endemic to the European-Asian continent. Although more than 12,000 clinical cases are reported annually worldwide, there is no anti-TBEV therapy available to treat patients with TBE. Porphyrins are macrocyclic molecules consisting of a planar tetrapyrrolic ring that can coordinate a metal cation. In this study, we investigated the cytotoxicity and anti-TBEV activity of a large series of alkyl- or (het)aryl-substituted porphyrins, metalloporphyrins, and chlorins and characterized their molecular interactions with the viral envelope in detail. Our structure-activity relationship study showed that the tetrapyrrole ring is an essential structural element for anti-TBEV activity, but that the presence of different structurally distinct side chains with different lengths, charges, and rigidity or metal cation coordination can significantly alter the antiviral potency of porphyrin scaffolds. Porphyrins were demonstrated to interact with the TBEV lipid membrane and envelope protein E, disrupt the TBEV envelope and inhibit the TBEV entry/fusion machinery. The crucial mechanism of the anti-TBEV activity of porphyrins is based on photosensitization and the formation of highly reactive singlet oxygen. In addition to blocking viral entry and fusion, porphyrins were also observed to interact with RNA oligonucleotides derived from TBEV genomic RNA, indicating that these compounds could target multiple viral/cellular structures. Furthermore, immunization of mice with porphyrin-inactivated TBEV resulted in the formation of TBEV-neutralizing antibodies and protected the mice from TBEV infection. Porphyrins can thus be used to inactivate TBEV while retaining the immunogenic properties of the virus and could be useful for producing new inactivated TBEV vaccines.
    MeSH term(s) Humans ; Animals ; Mice ; Encephalitis Viruses, Tick-Borne/genetics ; Antibodies, Viral/therapeutic use ; Viral Envelope ; Virus Internalization ; Encephalitis, Tick-Borne ; Porphyrins/pharmacology ; Porphyrins/therapeutic use ; RNA ; Antiviral Agents/pharmacology ; Antiviral Agents/therapeutic use ; Cations/therapeutic use
    Chemical Substances Antibodies, Viral ; Porphyrins ; RNA (63231-63-0) ; Antiviral Agents ; Cations
    Language English
    Publishing date 2023-11-30
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 306628-9
    ISSN 1872-9096 ; 0166-3542
    ISSN (online) 1872-9096
    ISSN 0166-3542
    DOI 10.1016/j.antiviral.2023.105767
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Non-Nucleotide RNA-Dependent RNA Polymerase Inhibitor That Blocks SARS-CoV-2 Replication.

    Dejmek, Milan / Konkoľová, Eva / Eyer, Luděk / Straková, Petra / Svoboda, Pavel / Šála, Michal / Krejčová, Kateřina / Růžek, Daniel / Boura, Evzen / Nencka, Radim

    Viruses

    2021  Volume 13, Issue 8

    Abstract: SARS-CoV-2 has caused an extensive pandemic of COVID-19 all around the world. Key viral enzymes are suitable molecular targets for the development of new antivirals against SARS-CoV-2 which could represent potential treatments of the corresponding ... ...

    Abstract SARS-CoV-2 has caused an extensive pandemic of COVID-19 all around the world. Key viral enzymes are suitable molecular targets for the development of new antivirals against SARS-CoV-2 which could represent potential treatments of the corresponding disease. With respect to its essential role in the replication of viral RNA, RNA-dependent RNA polymerase (RdRp) is one of the prime targets. HeE1-2Tyr and related derivatives were originally discovered as inhibitors of the RdRp of flaviviruses. Here, we present that these pyridobenzothiazole derivatives also significantly inhibit SARS-CoV-2 RdRp, as demonstrated using both polymerase- and cell-based antiviral assays.
    MeSH term(s) Adenosine Monophosphate/analogs & derivatives ; Adenosine Monophosphate/pharmacology ; Alanine/analogs & derivatives ; Alanine/pharmacology ; Animals ; Antiviral Agents/pharmacology ; Benzothiazoles/pharmacology ; Cell Line ; Cell Survival/drug effects ; Coronavirus RNA-Dependent RNA Polymerase/antagonists & inhibitors ; Dose-Response Relationship, Drug ; Enzyme Inhibitors/pharmacology ; Humans ; Microbial Sensitivity Tests ; Pyridones/pharmacology ; SARS-CoV-2/drug effects ; SARS-CoV-2/enzymology ; SARS-CoV-2/physiology ; Virus Replication/drug effects
    Chemical Substances Antiviral Agents ; Benzothiazoles ; Enzyme Inhibitors ; HeE1-2Tyr ; Pyridones ; remdesivir (3QKI37EEHE) ; Adenosine Monophosphate (415SHH325A) ; Coronavirus RNA-Dependent RNA Polymerase (EC 2.7.7.48) ; NSP12 protein, SARS-CoV-2 (EC 2.7.7.48) ; Alanine (OF5P57N2ZX)
    Language English
    Publishing date 2021-08-11
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2516098-9
    ISSN 1999-4915 ; 1999-4915
    ISSN (online) 1999-4915
    ISSN 1999-4915
    DOI 10.3390/v13081585
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Antiviral Activity of Uridine Derivatives of 2-Deoxy Sugars against Tick-Borne Encephalitis Virus.

    Krol, Ewelina / Wandzik, Ilona / Brzuska, Gabriela / Eyer, Luděk / Růžek, Daniel / Szewczyk, Boguslaw

    Molecules (Basel, Switzerland)

    2019  Volume 24, Issue 6

    Abstract: Tick-borne encephalitis virus (TBEV) is a causative agent of tick-borne encephalitis (TBE), one of the most important human infections involving the central nervous system. Although effective vaccines are available on the market, they are recommended ... ...

    Abstract Tick-borne encephalitis virus (TBEV) is a causative agent of tick-borne encephalitis (TBE), one of the most important human infections involving the central nervous system. Although effective vaccines are available on the market, they are recommended only in endemic areas. Despite many attempts, there are still no specific antiviral therapies for TBEV treatment. Previously, we synthesized a series of uridine derivatives of 2-deoxy sugars and proved that some compounds show antiviral activity against viruses from the Flaviviridae and Orthomyxoviridae families targeting the late steps of the
    MeSH term(s) Antiviral Agents/chemistry ; Antiviral Agents/pharmacology ; Cell Line, Tumor ; Cells, Cultured ; Deoxy Sugars/chemistry ; Deoxy Sugars/pharmacology ; Dose-Response Relationship, Drug ; Encephalitis Viruses, Tick-Borne/drug effects ; Encephalitis Viruses, Tick-Borne/physiology ; Humans ; Microbial Sensitivity Tests ; Molecular Structure ; Protein Biosynthesis/drug effects ; Uridine/analogs & derivatives ; Uridine/chemistry ; Uridine/pharmacology ; Viral Plaque Assay
    Chemical Substances Antiviral Agents ; Deoxy Sugars ; Uridine (WHI7HQ7H85)
    Language English
    Publishing date 2019-03-21
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules24061129
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Viral RNA-Dependent RNA Polymerase Inhibitor 7-Deaza-2'-

    Eyer, Luděk / Fojtíková, Martina / Nencka, Radim / Rudolf, Ivo / Hubálek, Zdeněk / Ruzek, Daniel

    Antimicrobial agents and chemotherapy

    2019  Volume 63, Issue 3

    Abstract: West Nile virus (WNV) is a medically important emerging arbovirus causing serious neuroinfections in humans and against which no approved antiviral therapy is currently available. In this study, we demonstrate that 2'- ...

    Abstract West Nile virus (WNV) is a medically important emerging arbovirus causing serious neuroinfections in humans and against which no approved antiviral therapy is currently available. In this study, we demonstrate that 2'-
    MeSH term(s) Animals ; Antiviral Agents/therapeutic use ; Cell Line ; Chlorocebus aethiops ; Disease Models, Animal ; Disease Progression ; Female ; Mice ; Mice, Inbred BALB C ; RNA Replicase/antagonists & inhibitors ; Swine ; Tubercidin/analogs & derivatives ; Tubercidin/therapeutic use ; Vero Cells ; Viremia/drug therapy ; Virus Replication/drug effects ; West Nile Fever/drug therapy ; West Nile Fever/pathology ; West Nile Fever/virology ; West Nile virus/drug effects ; West Nile virus/genetics
    Chemical Substances Antiviral Agents ; RNA Replicase (EC 2.7.7.48) ; Tubercidin (M351LCX45Y) ; 7-deaza-2'-C-methyladenosine (QRR62J6WEF)
    Language English
    Publishing date 2019-02-26
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 217602-6
    ISSN 1098-6596 ; 0066-4804
    ISSN (online) 1098-6596
    ISSN 0066-4804
    DOI 10.1128/AAC.02093-18
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Non-Nucleotide RNA-Dependent RNA Polymerase Inhibitor That Blocks SARS-CoV-2 Replication

    Dejmek, Milan / Konkoľová, Eva / Eyer, Luděk / Straková, Petra / Svoboda, Pavel / Šála, Michal / Krejčová, Kateřina / Růžek, Daniel / Boura, Evzen / Nencka, Radim

    Viruses. 2021 Aug. 11, v. 13, no. 8

    2021  

    Abstract: SARS-CoV-2 has caused an extensive pandemic of COVID-19 all around the world. Key viral enzymes are suitable molecular targets for the development of new antivirals against SARS-CoV-2 which could represent potential treatments of the corresponding ... ...

    Abstract SARS-CoV-2 has caused an extensive pandemic of COVID-19 all around the world. Key viral enzymes are suitable molecular targets for the development of new antivirals against SARS-CoV-2 which could represent potential treatments of the corresponding disease. With respect to its essential role in the replication of viral RNA, RNA-dependent RNA polymerase (RdRp) is one of the prime targets. HeE1-2Tyr and related derivatives were originally discovered as inhibitors of the RdRp of flaviviruses. Here, we present that these pyridobenzothiazole derivatives also significantly inhibit SARS-CoV-2 RdRp, as demonstrated using both polymerase- and cell-based antiviral assays.
    Keywords Flaviviridae ; RNA ; RNA-directed RNA polymerase ; Severe acute respiratory syndrome coronavirus 2 ; antiviral agents ; pandemic
    Language English
    Dates of publication 2021-0811
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2516098-9
    ISSN 1999-4915
    ISSN 1999-4915
    DOI 10.3390/v13081585
    Database NAL-Catalogue (AGRICOLA)

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  10. Article ; Online: Alkyl Derivatives of Perylene Photosensitizing Antivirals: Towards Understanding the Influence of Lipophilicity.

    Mikhnovets, Igor E / Holoubek, Jiří / Panina, Irina S / Kotouček, Jan / Gvozdev, Daniil A / Chumakov, Stepan P / Krasilnikov, Maxim S / Zhitlov, Mikhail Y / Gulyak, Evgeny L / Chistov, Alexey A / Nikitin, Timofei D / Korshun, Vladimir A / Efremov, Roman G / Alferova, Vera A / Růžek, Daniel / Eyer, Luděk / Ustinov, Alexey V

    International journal of molecular sciences

    2023  Volume 24, Issue 22

    Abstract: Amphipathic perylene derivatives are broad-spectrum antivirals against enveloped viruses that act as fusion inhibitors in a light-dependent manner. The compounds target the lipid bilayer of the viral envelope using the lipophilic perylene moiety and ... ...

    Abstract Amphipathic perylene derivatives are broad-spectrum antivirals against enveloped viruses that act as fusion inhibitors in a light-dependent manner. The compounds target the lipid bilayer of the viral envelope using the lipophilic perylene moiety and photogenerating singlet oxygen, thereby causing damage to unsaturated lipids. Previous studies show that variation of the polar part of the molecule is important for antiviral activity. Here, we report modification of the lipophilic part of the molecule, perylene, by the introduction of 4-, 8-, and 12-carbon alkyls into position 9(10) of the perylene residue. Using Friedel-Crafts acylation and Wolff-Kishner reduction, three 3-acetyl-9(10)-alkylperylenes were synthesized from perylene and used to prepare 9 nucleoside and 12 non-nucleoside amphipathic derivatives. These compounds were characterized as fluorophores and singlet oxygen generators, as well as tested as antivirals against herpes virus-1 (HSV-1) and vesicular stomatitis virus (VSV), both known for causing superficial skin/mucosa lesions and thus serving as suitable candidates for photodynamic therapy. The results suggest that derivatives with a short alkyl chain (butyl) have strong antiviral activity, whereas the introduction of longer alkyl substituents (
    MeSH term(s) Perylene/pharmacology ; Singlet Oxygen ; Photochemotherapy ; Herpesvirus 1, Human ; Antiviral Agents/pharmacology ; Antiviral Agents/chemistry ; Photosensitizing Agents/pharmacology
    Chemical Substances Perylene (5QD5427UN7) ; Singlet Oxygen (17778-80-2) ; Antiviral Agents ; Photosensitizing Agents
    Language English
    Publishing date 2023-11-18
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms242216483
    Database MEDical Literature Analysis and Retrieval System OnLINE

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