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  1. Article ; Online: STING Agonist-Mediated Cytokine Secretion Is Accompanied by Monocyte Apoptosis.

    Pimkova Polidarova, Marketa / Brehova, Petra / Dejmek, Milan / Birkus, Gabriel / Brazdova, Andrea

    ACS infectious diseases

    2022  Volume 8, Issue 3, Page(s) 463–471

    Abstract: The cGAS-STING (cyclic GMP-AMP synthase-stimulator of interferon genes) pathway plays a crucial role in inducing an antiviral and antitumor immune response. We studied the effects of synthetic STING agonists on several immune populations and related ... ...

    Abstract The cGAS-STING (cyclic GMP-AMP synthase-stimulator of interferon genes) pathway plays a crucial role in inducing an antiviral and antitumor immune response. We studied the effects of synthetic STING agonists on several immune populations and related cytokine production. In comparison with the toll-like receptor 7 (TLR7) agonist, STING agonists induced secretion of a broader proinflammatory cytokine spectrum. Unlike the TLR7 agonist, the structurally diverse STING agonists partially depleted B and NK cells and completely depleted CD14+ monocytes via induction of apoptosis. The TANK-binding kinase 1 inhibitor efficiently prevented interferon alpha (IFNα) secretion and cell depletion, suggesting their possible dependence on the cGAS-STING pathway activation. Finally, IFNα, tumor necrosis factor alpha, interleukin 6, and interleukin 1 beta secretion and CD14+ monocyte apoptosis were primary responses to STING agonists, whereas IFNγ was secreted secondarily. These findings bring new insights into the cGAS-STING pathway immunomodulation that is of future therapeutic importance.
    MeSH term(s) Apoptosis ; Cytokines/metabolism ; Membrane Proteins/genetics ; Monocytes/metabolism ; Signal Transduction
    Chemical Substances Cytokines ; Membrane Proteins
    Language English
    Publishing date 2022-02-08
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2373-8227
    ISSN (online) 2373-8227
    DOI 10.1021/acsinfecdis.1c00554
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Acidity constants and protonation sites of cyclic dinucleotides determined by capillary electrophoresis, quantum chemical calculations, and NMR spectroscopy.

    Štěpánová, Sille / Andris, Erik / Gutten, Ondrej / Buděšínský, Miloš / Dejmek, Milan / Břehová, Petra / Rulíšek, Lubomír / Kašička, Václav

    Electrophoresis

    2023  Volume 45, Issue 7-8, Page(s) 687–705

    Abstract: Cyclic dinucleotides (CDNs) are important second messengers in bacteria and eukaryotes. Detailed characterization of their physicochemical properties is a prerequisite for understanding their biological functions. Herein, we examine acid-base and ... ...

    Abstract Cyclic dinucleotides (CDNs) are important second messengers in bacteria and eukaryotes. Detailed characterization of their physicochemical properties is a prerequisite for understanding their biological functions. Herein, we examine acid-base and electromigration properties of selected CDNs employing capillary electrophoresis (CE), density functional theory (DFT), and nuclear magnetic resonance (NMR) spectroscopy to provide benchmark pK
    MeSH term(s) Electrophoresis, Capillary/methods ; Hydrogen-Ion Concentration ; Protons ; Magnetic Resonance Spectroscopy/methods ; Dinucleoside Phosphates/chemistry ; Thermodynamics ; Density Functional Theory
    Chemical Substances Protons ; Dinucleoside Phosphates
    Language English
    Publishing date 2023-12-07
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 619001-7
    ISSN 1522-2683 ; 0173-0835
    ISSN (online) 1522-2683
    ISSN 0173-0835
    DOI 10.1002/elps.202300232
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Fluorinated cGAMP analogs, which act as STING agonists and are not cleavable by poxins: Structural basis of their function.

    Klima, Martin / Dejmek, Milan / Duchoslav, Vojtech / Eisenreichova, Andrea / Sala, Michal / Chalupsky, Karel / Chalupska, Dominika / Novotná, Barbora / Birkuš, Gabriel / Nencka, Radim / Boura, Evzen

    Structure (London, England : 1993)

    2024  Volume 32, Issue 4, Page(s) 433–439.e4

    Abstract: The cGAS-STING pathway is a crucial part of innate immunity; it serves to detect DNA in the cytoplasm and to defend against certain cancers, viruses, and bacteria. We designed and synthesized fluorinated carbocyclic cGAMP analogs, MD1203 and MD1202D (MDs) ...

    Abstract The cGAS-STING pathway is a crucial part of innate immunity; it serves to detect DNA in the cytoplasm and to defend against certain cancers, viruses, and bacteria. We designed and synthesized fluorinated carbocyclic cGAMP analogs, MD1203 and MD1202D (MDs), to enhance their stability and their affinity for STING. These compounds demonstrated exceptional activity against STING. Despite their distinct chemical modifications relative to the canonical cyclic dinucleotides (CDNs), crystallographic analysis revealed a binding mode with STING that was consistent with the canonical CDNs. Importantly, MDs were resistant to cleavage by viral poxin nucleases and MDs-bound poxin adopted an unliganded-like conformation. Moreover, MDs complexed with poxin showed a conformation distinct from cGAMP bound to poxin, closely resembling their conformation when bound to STING. In conclusion, the development of MD1203 and MD1202D showcases their potential as potent STING activators with remarkable stability against poxin-mediated degradation-a crucial characteristic for future development of antivirals.
    MeSH term(s) Humans ; Nucleotides, Cyclic/chemistry ; Nucleotides, Cyclic/metabolism ; Neoplasms ; Nucleotidyltransferases/chemistry ; Immunity, Innate
    Chemical Substances cyclic guanosine monophosphate-adenosine monophosphate ; Nucleotides, Cyclic ; Nucleotidyltransferases (EC 2.7.7.-)
    Language English
    Publishing date 2024-02-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1213087-4
    ISSN 1878-4186 ; 0969-2126
    ISSN (online) 1878-4186
    ISSN 0969-2126
    DOI 10.1016/j.str.2024.01.008
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Mercury(II) Acetate

    Dejmek, Milan

    Synlett

    2012  Volume 23, Issue 19, Page(s) 2867–2868

    Language English
    Publishing date 2012-11-07
    Publisher © Georg Thieme Verlag
    Publishing place Stuttgart ; New York
    Document type Article
    ZDB-ID 2042012-2
    ISSN 1437-2096 ; 0936-5214
    ISSN (online) 1437-2096
    ISSN 0936-5214
    DOI 10.1055/s-0032-1317476
    Database Thieme publisher's database

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  5. Article ; Online: Synthetic Stimulator of Interferon Genes (STING) Agonists Induce a Cytokine-Mediated Anti-Hepatitis B Virus Response in Nonparenchymal Liver Cells.

    Pimkova Polidarova, Marketa / Vanekova, Lenka / Brehova, Petra / Dejmek, Milan / Vavrina, Zdenek / Birkus, Gabriel / Brazdova, Andrea

    ACS infectious diseases

    2022  Volume 9, Issue 1, Page(s) 23–32

    Abstract: Chronic hepatitis B (CHB) remains a major public health problem worldwide, with limited treatment options, but inducing an antiviral response by innate immunity activation may provide a therapeutic alternative. We assessed the cytokine-mediated anti- ... ...

    Abstract Chronic hepatitis B (CHB) remains a major public health problem worldwide, with limited treatment options, but inducing an antiviral response by innate immunity activation may provide a therapeutic alternative. We assessed the cytokine-mediated anti-hepatitis B virus (HBV) potential for stimulating the cyclic GMP-AMP synthase-stimulator of interferon genes (STING) pathway using STING agonists in primary human hepatocytes (PHH) and nonparenchymal liver cells (NPCs). The natural STING agonist, 2',3'-cyclic GMP-AMP, the synthetic analogue 3',3'-c-di(2'F,2'dAMP), and its bis(pivaloyloxymethyl) prodrug had strong indirect cytokine-mediated anti-HBV effects in PHH regardless of HBV genotype. Furthermore, STING agonists induced anti-HBV cytokine secretion
    MeSH term(s) Humans ; Animals ; Mice ; Cytokines/metabolism ; Herpesvirus 1, Cercopithecine ; Hepatocytes ; Hepatitis B/drug therapy ; Interferons/metabolism
    Chemical Substances Cytokines ; Interferons (9008-11-1)
    Language English
    Publishing date 2022-12-06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2373-8227
    ISSN (online) 2373-8227
    DOI 10.1021/acsinfecdis.2c00424
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Structure-based design and modular synthesis of novel PI4K class II inhibitors bearing a 4-aminoquinazoline scaffold.

    Misehe, Mbilo / Klima, Martin / Matoušová, Marika / Chalupská, Dominika / Dejmek, Milan / Šála, Michal / Mertlíková-Kaiserová, Helena / Boura, Evzen / Nencka, Radim

    Bioorganic & medicinal chemistry letters

    2022  Volume 76, Page(s) 129010

    Abstract: Novel 4-aminoquinazoline-6-carboxamide derivatives bearing differently substituted aryl or heteroaryl groups at position 7 in the core were rationally designed, synthesized and evaluated for biological activity in vitro as phosphatidylinositol 4-kinase ... ...

    Abstract Novel 4-aminoquinazoline-6-carboxamide derivatives bearing differently substituted aryl or heteroaryl groups at position 7 in the core were rationally designed, synthesized and evaluated for biological activity in vitro as phosphatidylinositol 4-kinase IIα (PI4K2A) inhibitors. The straightforward approach described here enabled the sequential, modular synthesis and broad functionalization of the scaffold in a mere six steps. The SAR investigation reported here is based on detailed structural analysis of the conserved binding mode of ATP and other adenine derivatives to the catalytic site of type II PI4Ks, combined with extensive docking studies. Several compounds exhibited significant activity against PI4K2A. Moreover, we solved a crystal structure of PI4K2B in complex with one of our lead ligand candidates, which validated the ligand binding site and pose predicted by our docking-based ligand model. These discoveries suggest that our structure-based approach may be further developed and employed to synthesize new inhibitors with optimized potency and selectivity for this class of PI4Ks.
    MeSH term(s) 1-Phosphatidylinositol 4-Kinase/chemistry ; 1-Phosphatidylinositol 4-Kinase/metabolism ; Ligands ; Adenosine Triphosphate/metabolism ; Adenine ; Structure-Activity Relationship ; Drug Design ; Molecular Docking Simulation
    Chemical Substances 4-aminoquinazoline ; 1-Phosphatidylinositol 4-Kinase (EC 2.7.1.67) ; Ligands ; Adenosine Triphosphate (8L70Q75FXE) ; Adenine (JAC85A2161)
    Language English
    Publishing date 2022-09-29
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1063195-1
    ISSN 1464-3405 ; 0960-894X
    ISSN (online) 1464-3405
    ISSN 0960-894X
    DOI 10.1016/j.bmcl.2022.129010
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Remdesivir triphosphate can efficiently inhibit the RNA-dependent RNA polymerase from various flaviviruses.

    Konkolova, Eva / Dejmek, Milan / Hřebabecký, Hubert / Šála, Michal / Böserle, Jiří / Nencka, Radim / Boura, Evzen

    Antiviral research

    2020  Volume 182, Page(s) 104899

    Abstract: Remdesivir was shown to inhibit RNA-dependent RNA-polymerases (RdRp) from distinct viral families such as from Filoviridae (Ebola) and Coronaviridae (SARS-CoV, SARS-CoV-2, MERS). In this study, we tested the ability of remdesivir to inhibit RdRps from ... ...

    Abstract Remdesivir was shown to inhibit RNA-dependent RNA-polymerases (RdRp) from distinct viral families such as from Filoviridae (Ebola) and Coronaviridae (SARS-CoV, SARS-CoV-2, MERS). In this study, we tested the ability of remdesivir to inhibit RdRps from the Flaviviridae family. Instead of remdesivir, we used the active species that is produced in cells from remdesivir, the appropriate triphosphate, which could be directly tested in vitro using recombinant flaviviral polymerases. Our results show that remdesivir can efficiently inhibit RdRps from viruses causing severe illnesses such as Yellow fever, West Nile fever, Japanese and Tick-borne encephalitis, Zika and Dengue. Taken together, this study demonstrates that remdesivir or its derivatives have the potential to become a broad-spectrum antiviral agent effective against many RNA viruses.
    MeSH term(s) Adenosine Triphosphate/analogs & derivatives ; Adenosine Triphosphate/chemistry ; Adenosine Triphosphate/pharmacology ; Antiviral Agents/chemistry ; Antiviral Agents/pharmacology ; Betacoronavirus/drug effects ; Betacoronavirus/enzymology ; COVID-19 ; Coronavirus Infections/drug therapy ; Coronavirus Infections/virology ; Flavivirus/drug effects ; Flavivirus/enzymology ; Humans ; Inhibitory Concentration 50 ; Pandemics ; Pneumonia, Viral/drug therapy ; Pneumonia, Viral/virology ; RNA Viruses/drug effects ; RNA Viruses/enzymology ; RNA-Dependent RNA Polymerase/antagonists & inhibitors ; RNA-Dependent RNA Polymerase/metabolism ; SARS-CoV-2
    Chemical Substances Antiviral Agents ; Adenosine Triphosphate (8L70Q75FXE) ; GS-441524 triphosphate (AEL0YED4SU) ; RNA-Dependent RNA Polymerase (EC 2.7.7.48)
    Keywords covid19
    Language English
    Publishing date 2020-08-05
    Publishing country Netherlands
    Document type 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.2020.104899
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Vinylphosphonate-based cyclic dinucleotides enhance STING-mediated cancer immunotherapy.

    Dejmek, Milan / Brazdova, Andrea / Otava, Tomáš / Polidarova, Marketa Pimkova / Klíma, Martin / Smola, Miroslav / Vavrina, Zdenek / Buděšínský, Miloš / Dračínský, Martin / Liboska, Radek / Boura, Evzen / Birkuš, Gabriel / Nencka, Radim

    European journal of medicinal chemistry

    2023  Volume 259, Page(s) 115685

    Abstract: Cyclic dinucleotides (CDNs) trigger the cyclic GMP-AMP synthase-stimulator of interferon genes (cGAS-STING) pathway, which plays a key role in cytosolic DNA sensing and thus in immunomodulation against infections, cell damage and cancer. However, cancer ... ...

    Abstract Cyclic dinucleotides (CDNs) trigger the cyclic GMP-AMP synthase-stimulator of interferon genes (cGAS-STING) pathway, which plays a key role in cytosolic DNA sensing and thus in immunomodulation against infections, cell damage and cancer. However, cancer immunotherapy trials with CDNs have shown immune activation, but not complete tumor regression. Nevertheless, we designed a novel class of CDNs containing vinylphosphonate based on a STING-affinity screening assay. In vitro, acyloxymethyl phosphate/phosphonate prodrugs of these vinylphosphonate CDNs were up to 1000-fold more potent than the clinical candidate ADU-S100. In vivo, the lead prodrug induced tumor-specific T cell priming and facilitated tumor regression in the 4T1 syngeneic mouse model of breast cancer. Moreover, we solved the crystal structure of this ligand bound to the STING protein. Therefore, our findings not only validate the therapeutic potential of vinylphosphonate CDNs but also open up opportunities for drug development in cancer immunotherapy bridging innate and adaptive immunity.
    MeSH term(s) Animals ; Mice ; Nucleotides, Cyclic/pharmacology ; Nucleotides, Cyclic/metabolism ; DNA ; Neoplasms/drug therapy ; Immunotherapy ; Immunity, Innate
    Chemical Substances Nucleotides, Cyclic ; ADU-S100 (FMW9ZVF53N) ; DNA (9007-49-2)
    Language English
    Publishing date 2023-07-26
    Publishing country France
    Document type Journal Article
    ZDB-ID 188597-2
    ISSN 1768-3254 ; 0009-4374 ; 0223-5234
    ISSN (online) 1768-3254
    ISSN 0009-4374 ; 0223-5234
    DOI 10.1016/j.ejmech.2023.115685
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Exploring positions 6 and 7 of a quinazoline-based scaffold leads to changes in selectivity and potency towards RIPK2/3 kinases.

    Misehe, Mbilo / Matoušová, Marika / Dvořáková, Alexandra / Hercík, Kamil / Škach, Kryštof / Chalupská, Dominika / Dejmek, Milan / Šála, Michal / Hájek, Miroslav / Boura, Evzen / Mertlíková-Kaiserová, Helena / Nencka, Radim

    European journal of medicinal chemistry

    2023  Volume 260, Page(s) 115717

    Abstract: Receptor-interacting protein kinases 2 and 3 (RIPK2 and RIPK3) are considered attractive therapeutic enzyme targets for the treatment of a multitude of inflammatory diseases and cancers. In this study, we developed three interrelated series of novel ... ...

    Abstract Receptor-interacting protein kinases 2 and 3 (RIPK2 and RIPK3) are considered attractive therapeutic enzyme targets for the treatment of a multitude of inflammatory diseases and cancers. In this study, we developed three interrelated series of novel quinazoline-based derivatives to investigate the effects of extensive modifications of positions 6 and 7 of the central core on the inhibitory activity and the selectivity against these RIPKs. The design of the derivatives was inspired by analyses of available literary knowledge on both RIPK2 and RIPK3 in complex with known quinazoline or quinoline inhibitors. Enzymatic investigations for bioactivity of the prepared molecules against purified RIPKs (RIPK1-4) shed light on multiple potent and selective RIPK2 and dual RIPK2/3 inhibitors. Furthermore, evaluations in living cells against the RIPK2-NOD1/2-mediated signaling pathways, identified as the potential primary targets, demonstrated nanomolar inhibition for a majority of the compounds. In addition, we have demonstrated overall good stability of various lead inhibitors in both human and mouse microsomes and plasma. Several of these compounds also were evaluated for selectivity across 58 human kinases other than RIPKs, exhibiting outstanding specificity profiles. We have thus clearly demonstrated that tuning appropriate substitutions at positions 6 and 7 of the developed quinazoline derivatives may lead to interesting potency and specificities against RIPK2 and RIPK3. This knowledge might therefore be employed for the targeted preparation of new, highly potent and selective tools against these RIPKs, which could be of utility in biological and clinical research.
    MeSH term(s) Humans ; Animals ; Mice ; Microsomes ; Quinazolines/pharmacology ; Receptor-Interacting Protein Serine-Threonine Kinase 2
    Chemical Substances Quinazolines ; RIPK2 protein, human (EC 2.7.11.1) ; Receptor-Interacting Protein Serine-Threonine Kinase 2 (EC 2.7.11.1)
    Language English
    Publishing date 2023-08-09
    Publishing country France
    Document type Journal Article
    ZDB-ID 188597-2
    ISSN 1768-3254 ; 0009-4374 ; 0223-5234
    ISSN (online) 1768-3254
    ISSN 0009-4374 ; 0223-5234
    DOI 10.1016/j.ejmech.2023.115717
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. 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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