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  1. Article ; Online: Dengue Virus Infects Human Skin Langerhans Cells through Langerin for Dissemination to Dendritic Cells.

    Helgers, Leanne C / Keijzer, Nadia C H / van Hamme, John L / Sprokholt, Joris K / Geijtenbeek, Teunis B H

    The Journal of investigative dermatology

    2023  Volume 144, Issue 5, Page(s) 1099–1111.e3

    Abstract: Dengue virus (DENV) is the most disease-causative flavivirus worldwide. DENV as a mosquito-borne virus infects human hosts through the skin; however, the initial target cells in the skin remain unclear. In this study, we have investigated whether ... ...

    Abstract Dengue virus (DENV) is the most disease-causative flavivirus worldwide. DENV as a mosquito-borne virus infects human hosts through the skin; however, the initial target cells in the skin remain unclear. In this study, we have investigated whether epidermal Langerhans cells (LCs) play a role in DENV acquisition and dissemination. We have used a human epidermal ex vivo infection model as well as isolated LCs to investigate infection by DENV. Notably, both immature and mature LCs were permissive to DENV infection in vitro and ex vivo, and infection was dependent on C-type lectin receptor langerin because blocking antibodies against langerin significantly reduced DENV infection in vitro and ex vivo. DENV-infected LCs efficiently transmitted DENV to target cells such as dendritic cells. Moreover, DENV exposure increased the migration of LCs from epidermal explants. These results strongly suggest that DENV targets epidermal LCs for infection and dissemination in the human host. These findings could provide potential drug targets to combat the early stage of DENV infection.
    MeSH term(s) Humans ; Langerhans Cells/virology ; Langerhans Cells/immunology ; Lectins, C-Type/metabolism ; Dengue Virus/physiology ; Mannose-Binding Lectins/metabolism ; Dendritic Cells/virology ; Dendritic Cells/immunology ; Antigens, CD/metabolism ; Dengue/virology ; Dengue/immunology ; Cell Movement ; Cells, Cultured ; Skin/virology ; Skin/pathology ; Epidermis/virology ; Epidermis/pathology ; Epidermis/metabolism
    Chemical Substances Lectins, C-Type ; Mannose-Binding Lectins ; CD207 protein, human ; Antigens, CD
    Language English
    Publishing date 2023-11-17
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80136-7
    ISSN 1523-1747 ; 0022-202X
    ISSN (online) 1523-1747
    ISSN 0022-202X
    DOI 10.1016/j.jid.2023.09.287
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Control of complement-induced inflammatory responses to SARS-CoV-2 infection by anti-SARS-CoV-2 antibodies.

    Bermejo-Jambrina, Marta / van der Donk, Lieve Eh / van Hamme, John L / Wilflingseder, Doris / de Bree, Godelieve / Prins, Maria / de Jong, Menno / Nieuwkerk, Pythia / van Gils, Marit J / Kootstra, Neeltje A / Geijtenbeek, Teunis Bh

    The EMBO journal

    2024  Volume 43, Issue 7, Page(s) 1135–1163

    Abstract: Dysregulated immune responses contribute to the excessive and uncontrolled inflammation observed in severe COVID-19. However, how immunity to SARS-CoV-2 is induced and regulated remains unclear. Here, we uncover the role of the complement system in the ... ...

    Abstract Dysregulated immune responses contribute to the excessive and uncontrolled inflammation observed in severe COVID-19. However, how immunity to SARS-CoV-2 is induced and regulated remains unclear. Here, we uncover the role of the complement system in the induction of innate and adaptive immunity to SARS-CoV-2. Complement rapidly opsonizes SARS-CoV-2 particles via the lectin pathway. Complement-opsonized SARS-CoV-2 efficiently induces type-I interferon and pro-inflammatory cytokine responses via activation of dendritic cells, which are inhibited by antibodies against the complement receptors (CR) 3 and 4. Serum from COVID-19 patients, or monoclonal antibodies against SARS-CoV-2, attenuate innate and adaptive immunity induced by complement-opsonized SARS-CoV-2. Blocking of CD32, the FcγRII antibody receptor of dendritic cells, restores complement-induced immunity. These results suggest that opsonization of SARS-CoV-2 by complement is involved in the induction of innate and adaptive immunity to SARS-CoV-2 in the acute phase of infection. Subsequent antibody responses limit inflammation and restore immune homeostasis. These findings suggest that dysregulation of the complement system and FcγRII signaling may contribute to severe COVID-19.
    MeSH term(s) Humans ; COVID-19 ; SARS-CoV-2 ; Antibodies, Viral ; Complement System Proteins ; Inflammation ; Immunity, Innate
    Chemical Substances Antibodies, Viral ; Complement System Proteins (9007-36-7)
    Language English
    Publishing date 2024-02-28
    Publishing country England
    Document type Journal Article
    ZDB-ID 586044-1
    ISSN 1460-2075 ; 0261-4189
    ISSN (online) 1460-2075
    ISSN 0261-4189
    DOI 10.1038/s44318-024-00061-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Variations in the Abortive HIV-1 RNA Hairpin Do Not Impede Viral Sensing and Innate Immune Responses.

    Stunnenberg, Melissa / van Hamme, John L / Das, Atze T / Berkhout, Ben / Geijtenbeek, Teunis B H

    Pathogens (Basel, Switzerland)

    2021  Volume 10, Issue 7

    Abstract: The highly conserved trans-acting response element (TAR) present in the RNA genome of human immunodeficiency virus 1 (HIV-1) is a stably folded hairpin structure involved in viral replication. However, TAR is also sensed by viral sensors, leading to ... ...

    Abstract The highly conserved trans-acting response element (TAR) present in the RNA genome of human immunodeficiency virus 1 (HIV-1) is a stably folded hairpin structure involved in viral replication. However, TAR is also sensed by viral sensors, leading to antiviral immunity. While high variation in the TAR RNA structure renders the virus replication-incompetent, effects on viral sensing remain unclear. Here, we investigated the role of TAR RNA structure and stability on viral sensing. TAR mutants with deletions in the TAR hairpin that enhanced thermodynamic stability increased antiviral responses. Strikingly, TAR mutants with lower stability due to destabilization of the TAR hairpin also increased antiviral responses without affecting pro-inflammatory responses. Moreover, mutations that affected the TAR RNA sequence also enhanced specific antiviral responses. Our data suggest that mutations in TAR of replication-incompetent viruses can still induce immune responses via viral sensors, hereby underscoring the robustness of HIV-1 RNA sensing mechanisms.
    Language English
    Publishing date 2021-07-15
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2695572-6
    ISSN 2076-0817
    ISSN 2076-0817
    DOI 10.3390/pathogens10070897
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Abortive HIV-1 RNA induces pro-IL-1β maturation via protein kinase PKR and inflammasome activation in humans.

    Stunnenberg, Melissa / van Hamme, John L / Trimp, Marjolein / Gringhuis, Sonja I / Geijtenbeek, Teunis B H

    European journal of immunology

    2021  Volume 51, Issue 10, Page(s) 2464–2477

    Abstract: The proinflammatory cytokine IL-1β mediates high levels of immune activation observed during acute and chronic human immunodeficiency virus 1 (HIV-1) infection. Little is known about the mechanisms that drive IL-1β activation during HIV-1 infection. Here, ...

    Abstract The proinflammatory cytokine IL-1β mediates high levels of immune activation observed during acute and chronic human immunodeficiency virus 1 (HIV-1) infection. Little is known about the mechanisms that drive IL-1β activation during HIV-1 infection. Here, we have identified a crucial role for abortive HIV-1 RNAs in inducing IL-1β in humans. Abortive HIV-1 RNAs were sensed by protein kinase RNA-activated (PKR), which triggered activation of the canonical NLRP3 inflammasome and caspase-1, leading to pro-IL-1β processing and secretion. PKR activated the inflammasome via ROS generation and MAP kinases ERK1/2, JNK, and p38. Inhibition of PKR during HIV-1 infection blocked IL-1β production. As abortive HIV-1 RNAs are produced during productive infection and latency, our data strongly suggest that targeting PKR signaling might attenuate immune activation during acute and chronic HIV-1 infection.
    MeSH term(s) HIV Infections/metabolism ; HIV Infections/virology ; HIV-1/physiology ; Host-Pathogen Interactions ; Humans ; Inflammasomes/metabolism ; Interleukin-1beta/metabolism ; MAP Kinase Signaling System ; NLR Family, Pyrin Domain-Containing 3 Protein/metabolism ; RNA, Viral/genetics ; RNA, Viral/metabolism ; Reactive Oxygen Species/metabolism ; Receptors, Pattern Recognition/metabolism ; Signal Transduction ; eIF-2 Kinase/metabolism
    Chemical Substances IL1B protein, human ; Inflammasomes ; Interleukin-1beta ; NLR Family, Pyrin Domain-Containing 3 Protein ; RNA, Viral ; Reactive Oxygen Species ; Receptors, Pattern Recognition ; EIF2AK2 protein, human (EC 2.7.11.1) ; eIF-2 Kinase (EC 2.7.11.1)
    Language English
    Publishing date 2021-07-23
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 120108-6
    ISSN 1521-4141 ; 0014-2980
    ISSN (online) 1521-4141
    ISSN 0014-2980
    DOI 10.1002/eji.202149275
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Crosstalk between R848 and abortive HIV-1 RNA-induced signaling enhances antiviral immunity.

    Stunnenberg, Melissa / van Hamme, John L / Zijlstra-Willems, Esther M / Gringhuis, Sonja I / Geijtenbeek, Teunis B H

    Journal of leukocyte biology

    2022  Volume 112, Issue 2, Page(s) 289–298

    Abstract: Pathogens trigger multiple pattern recognition receptors (PRRs) that together dictate innate and adaptive immune responses. Understanding the crosstalk between PRRs is important to enhance vaccine efficacy. Abortive HIV-1 RNA transcripts are produced ... ...

    Abstract Pathogens trigger multiple pattern recognition receptors (PRRs) that together dictate innate and adaptive immune responses. Understanding the crosstalk between PRRs is important to enhance vaccine efficacy. Abortive HIV-1 RNA transcripts are produced during acute and chronic HIV-1 infection and are known ligands for different PRRs, leading to antiviral and proinflammatory responses. Here, we have investigated the crosstalk between responses induced by these 58 nucleotide-long HIV-1 RNA transcripts and different TLR ligands. Costimulation of dendritic cells (DCs) with abortive HIV-1 RNA and TLR7/8 agonist R848, but not other TLR agonists, resulted in enhanced antiviral type I IFN responses as well as adaptive immune responses via the induction of DC-mediated T helper 1 (T
    MeSH term(s) Adjuvants, Immunologic ; Antiviral Agents ; CD8-Positive T-Lymphocytes ; Dendritic Cells ; HIV-1/physiology ; Immunity, Innate ; RNA ; Receptors, Pattern Recognition
    Chemical Substances Adjuvants, Immunologic ; Antiviral Agents ; Receptors, Pattern Recognition ; RNA (63231-63-0)
    Language English
    Publishing date 2022-01-04
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 605722-6
    ISSN 1938-3673 ; 0741-5400
    ISSN (online) 1938-3673
    ISSN 0741-5400
    DOI 10.1002/JLB.4A0721-365R
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Prevotella timonensis bacteria associated with vaginal dysbiosis enhance HIV-1 susceptibility of vaginal CD4+ T cells.

    van Teijlingen, Nienke H / van Smoorenburg, Marleen Y / Sarrami-Forooshani, Ramin / Zijlstra-Willems, Esther M / van Hamme, John L / Borgdorff, Hanneke / van de Wijgert, Janneke Hhm / van Leeuwen, Elisabeth / van der Post, Joris A M / Strijbis, Karin / Ribeiro, Carla M S / Geijtenbeek, Teunis B H

    The Journal of infectious diseases

    2024  

    Abstract: Dysbiosis of the vaginal microbiome poses a serious risk for sexual HIV-1 transmission. Prevotella spp. are abundant during vaginal dysbiosis and associated with enhanced HIV-1 susceptibility; however, underlying mechanisms remain unclear. Here, we ... ...

    Abstract Dysbiosis of the vaginal microbiome poses a serious risk for sexual HIV-1 transmission. Prevotella spp. are abundant during vaginal dysbiosis and associated with enhanced HIV-1 susceptibility; however, underlying mechanisms remain unclear. Here, we investigated the direct effect of vaginal bacteria on HIV-1 susceptibility of vaginal CD4+ T cells. Notably, pre-exposure to Prevotella timonensis enhanced HIV-1 uptake by vaginal T cells, leading to increased viral fusion and enhanced virus production. Pre-exposure to antiretroviral inhibitors abolished Prevotella timonensis-enhanced infection. Hence, our study shows that the vaginal microbiome directly affects mucosal CD4+ T cell susceptibility, emphasising importance of vaginal dysbiosis diagnosis and treatment.
    Language English
    Publishing date 2024-04-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3019-3
    ISSN 1537-6613 ; 0022-1899
    ISSN (online) 1537-6613
    ISSN 0022-1899
    DOI 10.1093/infdis/jiae166
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Variations in the Abortive HIV-1 RNA Hairpin Do Not Impede Viral Sensing and Innate Immune Responses

    Stunnenberg, Melissa / van Hamme, John L. / Das, Atze T. / Berkhout, Ben / Geijtenbeek, Teunis B. H.

    Pathogens. 2021 July 15, v. 10, no. 7

    2021  

    Abstract: The highly conserved trans-acting response element (TAR) present in the RNA genome of human immunodeficiency virus 1 (HIV-1) is a stably folded hairpin structure involved in viral replication. However, TAR is also sensed by viral sensors, leading to ... ...

    Abstract The highly conserved trans-acting response element (TAR) present in the RNA genome of human immunodeficiency virus 1 (HIV-1) is a stably folded hairpin structure involved in viral replication. However, TAR is also sensed by viral sensors, leading to antiviral immunity. While high variation in the TAR RNA structure renders the virus replication-incompetent, effects on viral sensing remain unclear. Here, we investigated the role of TAR RNA structure and stability on viral sensing. TAR mutants with deletions in the TAR hairpin that enhanced thermodynamic stability increased antiviral responses. Strikingly, TAR mutants with lower stability due to destabilization of the TAR hairpin also increased antiviral responses without affecting pro-inflammatory responses. Moreover, mutations that affected the TAR RNA sequence also enhanced specific antiviral responses. Our data suggest that mutations in TAR of replication-incompetent viruses can still induce immune responses via viral sensors, hereby underscoring the robustness of HIV-1 RNA sensing mechanisms.
    Keywords Human immunodeficiency virus 1 ; RNA ; genome ; nucleotide sequences ; thermodynamics ; virus replication ; viruses
    Language English
    Dates of publication 2021-0715
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2695572-6
    ISSN 2076-0817
    ISSN 2076-0817
    DOI 10.3390/pathogens10070897
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: SARS-CoV-2 suppresses TLR4-induced immunity by dendritic cells via C-type lectin receptor DC-SIGN.

    van der Donk, Lieve E H / Bermejo-Jambrina, Marta / van Hamme, John L / Volkers, Mette M W / van Nuenen, Ad C / Kootstra, Neeltje A / Geijtenbeek, Teunis B H

    PLoS pathogens

    2023  Volume 19, Issue 10, Page(s) e1011735

    Abstract: SARS-CoV-2 causes COVID-19, an infectious disease with symptoms ranging from a mild cold to severe pneumonia, inflammation, and even death. Although strong inflammatory responses are a major factor in causing morbidity and mortality, superinfections with ...

    Abstract SARS-CoV-2 causes COVID-19, an infectious disease with symptoms ranging from a mild cold to severe pneumonia, inflammation, and even death. Although strong inflammatory responses are a major factor in causing morbidity and mortality, superinfections with bacteria during severe COVID-19 often cause pneumonia, bacteremia and sepsis. Aberrant immune responses might underlie increased sensitivity to bacteria during COVID-19 but the mechanisms remain unclear. Here we investigated whether SARS-CoV-2 directly suppresses immune responses to bacteria. We studied the functionality of human dendritic cells (DCs) towards a variety of bacterial triggers after exposure to SARS-CoV-2 Spike (S) protein and SARS-CoV-2 primary isolate (hCoV-19/Italy). Notably, pre-exposure of DCs to either SARS-CoV-2 S protein or a SARS-CoV-2 isolate led to reduced type I interferon (IFN) and cytokine responses in response to Toll-like receptor (TLR)4 agonist lipopolysaccharide (LPS), whereas other TLR agonists were not affected. SARS-CoV-2 S protein interacted with the C-type lectin receptor DC-SIGN and, notably, blocking DC-SIGN with antibodies restored type I IFN and cytokine responses to LPS. Moreover, blocking the kinase Raf-1 by a small molecule inhibitor restored immune responses to LPS. These results suggest that SARS-CoV-2 modulates DC function upon TLR4 triggering via DC-SIGN-induced Raf-1 pathway. These data imply that SARS-CoV-2 actively suppresses DC function via DC-SIGN, which might account for the higher mortality rates observed in patients with COVID-19 and bacterial superinfections.
    MeSH term(s) Humans ; SARS-CoV-2/metabolism ; Toll-Like Receptor 4/metabolism ; Lipopolysaccharides/pharmacology ; Lipopolysaccharides/metabolism ; Superinfection ; COVID-19/metabolism ; Lectins, C-Type/metabolism ; Cytokines/metabolism ; Dendritic Cells
    Chemical Substances DC-specific ICAM-3 grabbing nonintegrin ; spike protein, SARS-CoV-2 ; Toll-Like Receptor 4 ; Lipopolysaccharides ; Lectins, C-Type ; Cytokines ; TLR4 protein, human
    Language English
    Publishing date 2023-10-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2205412-1
    ISSN 1553-7374 ; 1553-7374
    ISSN (online) 1553-7374
    ISSN 1553-7374
    DOI 10.1371/journal.ppat.1011735
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Ectopic expression of cGAS in

    Waanders, Lisette / van der Donk, Lieve E H / Ates, Louis S / Maaskant, Janneke / van Hamme, John L / Eldering, Eric / van Bruggen, Jaco A C / Rietveld, Joanne M / Bitter, Wilbert / Geijtenbeek, Teunis B H / Kuijl, Coenraad P

    Journal for immunotherapy of cancer

    2023  Volume 11, Issue 4

    Abstract: Background: Interferon (IFN)-β induction via activation of the stimulator of interferon genes (STING) pathway has shown promising results in tumor models. STING is activated by cyclic dinucleotides such as cyclic GMP-AMP dinucleotides with ... ...

    Abstract Background: Interferon (IFN)-β induction via activation of the stimulator of interferon genes (STING) pathway has shown promising results in tumor models. STING is activated by cyclic dinucleotides such as cyclic GMP-AMP dinucleotides with phosphodiester linkages 2'-5' and 3'-5' (cGAMPs), that are produced by cyclic GMP-AMP synthetase (cGAS). However, delivery of STING pathway agonists to the tumor site is a challenge. Bacterial vaccine strains have the ability to specifically colonize hypoxic tumor tissues and could therefore be modified to overcome this challenge. Combining high STING-mediated IFN-β levels with the immunostimulatory properties of
    Methods: We have engineered
    Results: Expression of cGAS in
    Conclusion: S. typhimurium
    MeSH term(s) Humans ; Salmonella typhimurium/metabolism ; Ectopic Gene Expression ; Nucleotidyltransferases/genetics ; Nucleotidyltransferases/metabolism ; Macrophages/metabolism ; Interferon Type I ; Neoplasms/metabolism ; Dendritic Cells/metabolism ; Tumor Microenvironment
    Chemical Substances cyclic guanosine monophosphate-adenosine monophosphate ; Nucleotidyltransferases (EC 2.7.7.-) ; Interferon Type I
    Language English
    Publishing date 2023-04-18
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2719863-7
    ISSN 2051-1426 ; 2051-1426
    ISSN (online) 2051-1426
    ISSN 2051-1426
    DOI 10.1136/jitc-2022-005839
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Low energy nebulization preserves integrity of SARS-CoV-2 mRNA vaccines for respiratory delivery.

    van Rijn, Cees J M / Vlaming, Killian E / Bem, Reinout A / Dekker, Rob J / Poortinga, Albert / Breit, Timo / van Leeuwen, Selina / Ensink, Wim A / van Wijnbergen, Kelly / van Hamme, John L / Bonn, Daniel / Geijtenbeek, Teunis B H

    Scientific reports

    2023  Volume 13, Issue 1, Page(s) 8851

    Abstract: Nebulization of mRNA therapeutics can be used to directly target the respiratory tract. A promising prospect is that mucosal administration of lipid nanoparticle (LNP)-based mRNA vaccines may lead to a more efficient protection against respiratory ... ...

    Abstract Nebulization of mRNA therapeutics can be used to directly target the respiratory tract. A promising prospect is that mucosal administration of lipid nanoparticle (LNP)-based mRNA vaccines may lead to a more efficient protection against respiratory viruses. However, the nebulization process can rupture the LNP vehicles and degrade the mRNA molecules inside. Here we present a novel nebulization method able to preserve substantially the integrity of vaccines, as tested with two SARS-CoV-2 mRNA vaccines. We compare the new method with well-known nebulization methods used for medical respiratory applications. We find that a lower energy level in generating LNP droplets using the new nebulization method helps safeguard the integrity of the LNP and vaccine. By comparing nebulization techniques with different energy dissipation levels we find that LNPs and mRNAs can be kept largely intact if the energy dissipation remains below a threshold value, for LNP integrity 5-10 J/g and for mRNA integrity 10-20 J/g for both vaccines.
    MeSH term(s) Humans ; COVID-19 Vaccines ; SARS-CoV-2/genetics ; COVID-19/prevention & control ; RNA, Messenger/genetics ; mRNA Vaccines ; Nanoparticles
    Chemical Substances COVID-19 Vaccines ; RNA, Messenger ; mRNA Vaccines
    Language English
    Publishing date 2023-05-31
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-023-35872-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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