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  1. Article ; Online: A ban on BAM: an update on inhibitors of the β-barrel assembly machinery.

    Steenhuis, Maurice / van Ulsen, Peter / Martin, Nathaniel I / Luirink, Joen

    FEMS microbiology letters

    2021  Volume 368, Issue 11

    Abstract: Gram-negative pathogens are a rapidly increasing threat to human health worldwide due to high rates of antibiotic resistance and the lack of development of novel antibiotics. The protective cell envelope of gram-negative bacteria is a major permeability ... ...

    Abstract Gram-negative pathogens are a rapidly increasing threat to human health worldwide due to high rates of antibiotic resistance and the lack of development of novel antibiotics. The protective cell envelope of gram-negative bacteria is a major permeability barrier that contributes to the problem by restricting the uptake of antibiotics. On the other hand, its unique architecture also makes it a suitable target for antibiotic interference. In particular, essential multiprotein machines that are required for biogenesis of the outer membrane have attracted attention in antibacterial design strategies. Recently, significant progress has been made in the development of inhibitors of the β-barrel assembly machine (BAM) complex. Here, we summarize the current state of drug development efforts targeting the BAM complex in pursuit of new antibiotics.
    MeSH term(s) Anti-Bacterial Agents/chemistry ; Anti-Bacterial Agents/pharmacology ; Bacterial Outer Membrane/drug effects ; Bacterial Outer Membrane/metabolism ; Bacterial Outer Membrane Proteins/antagonists & inhibitors ; Bacterial Outer Membrane Proteins/genetics ; Bacterial Outer Membrane Proteins/metabolism ; Drug Resistance, Bacterial/genetics ; Gram-Negative Bacteria/drug effects ; Gram-Negative Bacteria/pathogenicity ; Humans ; Mutation ; Virulence/drug effects
    Chemical Substances Anti-Bacterial Agents ; Bacterial Outer Membrane Proteins
    Language English
    Publishing date 2021-08-26
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 752343-9
    ISSN 1574-6968 ; 0378-1097
    ISSN (online) 1574-6968
    ISSN 0378-1097
    DOI 10.1093/femsle/fnab059
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Quality assessment and harmonization of laboratories across Europe for multiple SARS-CoV-2 serology assays.

    Steenhuis, Maurice / Wouters, Elise / Schrezenmeier, Hubert / Rispens, Theo / Tiberghien, Pierre / Harvala, Heli / Feys, Hendrik B / van der Schoot, C Ellen

    Vox sanguinis

    2023  Volume 118, Issue 8, Page(s) 666–673

    Abstract: Background and objectives: There is a need for conversion of SARS-CoV-2 serology data from different laboratories to a harmonized international unit. We aimed to compare the performance of multiple SARS-CoV-2 antibody serology assays among 25 ... ...

    Abstract Background and objectives: There is a need for conversion of SARS-CoV-2 serology data from different laboratories to a harmonized international unit. We aimed to compare the performance of multiple SARS-CoV-2 antibody serology assays among 25 laboratories across 12 European countries.
    Materials and methods: To investigate this we have distributed to all participating laboratories a panel of 15 SARS-CoV-2 plasma samples and a single batch of pooled plasma calibrated to the WHO IS 20/136 standard.
    Results: All assays showed excellent discrimination between SARS-CoV-2 seronegative plasma samples and pre-vaccinated seropositive plasma samples but differed substantially in raw antibody titres. Titres could be harmonized to binding antibody units per millilitre by calibration in relation to a reference reagent.
    Conclusion: The standardization of antibody quantification is of paramount importance to allow interpretation and comparison of serology data reported in clinical trials in order to identify donor cohorts from whom the most effective convalescent plasma can be collected.
    MeSH term(s) Humans ; SARS-CoV-2 ; COVID-19/diagnosis ; Laboratories ; COVID-19 Serotherapy ; Europe ; Antibodies, Viral ; COVID-19 Testing
    Chemical Substances Antibodies, Viral
    Language English
    Publishing date 2023-07-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 80313-3
    ISSN 1423-0410 ; 0042-9007
    ISSN (online) 1423-0410
    ISSN 0042-9007
    DOI 10.1111/vox.13480
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Fingerprick blood samples to measure serum natalizumab concentrations.

    Toorop, Alyssa A / Steenhuis, Maurice / Loeff, Floris C / Weijers, Suzanne S / Killestein, Joep / Rispens, Theo / Kempen, Zoé LE van

    Multiple sclerosis (Houndmills, Basingstoke, England)

    2022  Volume 29, Issue 3, Page(s) 457–460

    Abstract: Background: Natalizumab via subcutaneous administration was recently approved for patients with multiple sclerosis.: Objective: In light of personalized extended dosing, in which treatment intervals are prolonged to a concentration cut-off, it would ... ...

    Abstract Background: Natalizumab via subcutaneous administration was recently approved for patients with multiple sclerosis.
    Objective: In light of personalized extended dosing, in which treatment intervals are prolonged to a concentration cut-off, it would be preferable to measure natalizumab drug concentrations in capillary blood.
    Methods: In this cross-sectional study in patients treated with intravenous (IV) natalizumab, capillary blood samples by fingerprick and venous blood samples were collected in 30 participants prior to IV administration of natalizumab.
    Results: Natalizumab concentrations were similar with a mean bias of -0.36 μg/mL (95% CI: 1.3 to -2 μg/mL).
    Conclusions: This study shows that physicians can monitor natalizumab drug concentrations by a fingerprick, which could be used for personalized extended dosing.
    MeSH term(s) Humans ; Natalizumab/therapeutic use ; Cross-Sectional Studies ; Multiple Sclerosis/drug therapy ; Risk Factors ; Administration, Intravenous ; Immunologic Factors/adverse effects ; Multiple Sclerosis, Relapsing-Remitting/drug therapy
    Chemical Substances Natalizumab ; Immunologic Factors
    Language English
    Publishing date 2022-11-30
    Publishing country England
    Document type Journal Article
    ZDB-ID 1290669-4
    ISSN 1477-0970 ; 1352-4585
    ISSN (online) 1477-0970
    ISSN 1352-4585
    DOI 10.1177/13524585221136448
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Patient-perspective and feasibility of home finger-prick testing to complement and facilitate large-scale research in rheumatology.

    Besten, Yaëlle R / Boekel, Laura / Steenhuis, Maurice / Hooijberg, Femke / Atiqi, Sadaf / Leeuw, Maureen / Vogelzang, Erik H / Keijser, Jim / Keijzer, Sofie / Loeff, Floris C / Gerritsen, Martijn / Tas, Sander W / Nurmohamed, Michael T / Rispens, Theo / Wolbink, Gertjan

    RMD open

    2024  Volume 10, Issue 2

    Abstract: Background: During the COVID-19 pandemic, we developed a digital research platform to longitudinally investigate COVID-19-related outcomes in patients with rheumatic diseases and healthy controls. We used home finger-prick testing in order to collect ... ...

    Abstract Background: During the COVID-19 pandemic, we developed a digital research platform to longitudinally investigate COVID-19-related outcomes in patients with rheumatic diseases and healthy controls. We used home finger-prick testing in order to collect serum samples remotely and increase the overall efficiency of the platform. The aim of the present study was to evaluate the success rate of the finger prick and patients' perspective towards the finger prick.
    Methods: Serum samples were collected up to five times during follow-up, either via a venepuncture at the research institute or a finger prick from participants' home. Participants were asked to complete a digital evaluation questionnaire of the finger prick after their attempts.
    Results: A total of 2135 patients and 899 controls performed at least one finger prick and were included in this study. The first finger prick was successfully done by 92% (95% CI: 90% to 93%) of patients, 94% (95% CI: 92% to 95%) of controls, 93% (95% CI: 92% to 94%) of all participants aged ≤70 years and 89% (95% CI: 86% to 92%) of all participants aged >70 years. Sex did not impact these success rates. Repeated failure occurred in 11/439 (0.8%) patients and 4/712 (0.6%) controls. Both patients and controls were less willing to perform a finger prick for individual healthcare compared with scientific research.
    Conclusion: The vast majority of participants, among which elderly and patients with rheumatic diseases, were able to successfully draw the required amount of blood for serological analyses. This shows that finger-prick testing is suitable for a high-throughput implementation to monitor patients remotely.
    MeSH term(s) Aged ; Humans ; Rheumatology ; Pandemics ; Feasibility Studies ; Blood Specimen Collection ; COVID-19/diagnosis ; COVID-19/epidemiology ; Rheumatic Diseases/diagnosis
    Language English
    Publishing date 2024-04-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 2812592-7
    ISSN 2056-5933 ; 2056-5933
    ISSN (online) 2056-5933
    ISSN 2056-5933
    DOI 10.1136/rmdopen-2023-003933
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Stress-Based High-Throughput Screening Assays to Identify Inhibitors of Cell Envelope Biogenesis.

    Steenhuis, Maurice / Ten Hagen-Jongman, Corinne M / van Ulsen, Peter / Luirink, Joen

    Antibiotics (Basel, Switzerland)

    2020  Volume 9, Issue 11

    Abstract: The structural integrity of the Gram-negative cell envelope is guarded by several stress responses, such as the ... ...

    Abstract The structural integrity of the Gram-negative cell envelope is guarded by several stress responses, such as the σ
    Language English
    Publishing date 2020-11-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2681345-2
    ISSN 2079-6382
    ISSN 2079-6382
    DOI 10.3390/antibiotics9110808
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Dual Action of Eeyarestatin 24 on Sec-Dependent Protein Secretion and Bacterial DNA.

    Schäfer, Ann-Britt / Steenhuis, Maurice / Jim, Kin Ki / Neef, Jolanda / O'Keefe, Sarah / Whitehead, Roger C / Swanton, Eileithyia / Wang, Biwen / Halbedel, Sven / High, Stephen / van Dijl, Jan Maarten / Luirink, Joen / Wenzel, Michaela

    ACS infectious diseases

    2023  Volume 9, Issue 2, Page(s) 253–269

    Abstract: Eeyarestatin 24 (ES24) is a promising new antibiotic with broad-spectrum activity. It shares structural similarity with nitrofurantoin (NFT), yet appears to have a distinct and novel mechanism: ES24 was found to inhibit SecYEG-mediated protein transport ... ...

    Abstract Eeyarestatin 24 (ES24) is a promising new antibiotic with broad-spectrum activity. It shares structural similarity with nitrofurantoin (NFT), yet appears to have a distinct and novel mechanism: ES24 was found to inhibit SecYEG-mediated protein transport and membrane insertion in Gram-negative bacteria. However, possible additional targets have not yet been explored. Moreover, its activity was notably better against Gram-positive bacteria, for which its mechanism of action had not yet been investigated. We have used transcriptomic stress response profiling, phenotypic assays, and protein secretion analyses to investigate the mode of action of ES24 in comparison with NFT using the Gram-positive model bacterium
    MeSH term(s) Animals ; Escherichia coli/genetics ; Escherichia coli/metabolism ; DNA, Bacterial ; Anti-Bacterial Agents/pharmacology ; Anti-Bacterial Agents/metabolism ; Zebrafish ; Gram-Negative Bacteria/metabolism ; Gram-Positive Bacteria ; Protein Transport
    Chemical Substances DNA, Bacterial ; Anti-Bacterial Agents
    Language English
    Publishing date 2023-01-13
    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.2c00404
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Clinical Validation of a Capillary Blood Home-Based Self-Sampling Technique for Monitoring of Infliximab, Vedolizumab, and C-Reactive Protein Concentrations in Patients With Inflammatory Bowel Disease.

    Otten, Antonius T / van der Meulen, Hedwig H / Steenhuis, Maurice / Loeff, Floris C / Touw, Daan J / Kosterink, Jos G W / Frijlink, Henderik W / Rispens, Theo / Dijkstra, Gerard / Visschedijk, Marijn C / Bourgonje, Arno R

    Inflammatory bowel diseases

    2023  Volume 30, Issue 3, Page(s) 325–335

    Abstract: Background: Therapeutic drug monitoring provides important guidance for treatment of patients with inflammatory bowel disease (IBD) and could help to early identify treatment failure. This study aimed to validate a finger prick-based capillary blood ... ...

    Abstract Background: Therapeutic drug monitoring provides important guidance for treatment of patients with inflammatory bowel disease (IBD) and could help to early identify treatment failure. This study aimed to validate a finger prick-based capillary blood sampling technique to measure biological trough levels and C-reactive protein (CRP) and evaluate patient performance and -support.
    Methods: In this prospective cohort study, patients with IBD receiving infliximab (IFX) or vedolizumab (VEDO) therapy performed finger prick-based capillary blood sampling at home. Additionally, blood was collected through routinely performed in-hospital venepuncture prior to biological infusion. IFX, VEDO, and CRP concentrations were measured by enzyme-linked immunosorbent assay. The concordance between methods was statistically evaluated and a survey was conducted to assess practicality and patient support.
    Results: In total, 81 patients (46 IFX, 35 VEDO) were enrolled. Mean differences between both methods were 0.42 (95% confidence interval, -1.74 to 2.58) μg/mL for IFX and 0.72 (95% confidence interval, -5.50 to 6.94) μg/mL for VEDO. Passing-Bablok regressions demonstrated no evidence for systematic or proportional biases. Venous and capillary IFX (ρ = 0.96, P < .001) and VEDO (ρ = 0.97, P < .001) levels strongly correlated and showed high intermethod agreement (Cohen's kappa: IFX = 0.82; VEDO = 0.94). Similarly, venous and capillary CRP levels were strongly correlated (ρ = 0.99, P < .001). Most patients (>95%) were able to successfully perform the self-sampling at home without prior instructions.
    Conclusions: This study clinically validated a finger prick-based capillary blood self-sampling technique allowing concomitant home monitoring of biological levels and CRP for patients with IBD, who reported substantial support, tolerability, and practicality.
    MeSH term(s) Humans ; Antibodies, Monoclonal, Humanized ; C-Reactive Protein ; Inflammatory Bowel Diseases/drug therapy ; Infliximab/pharmacokinetics ; Infliximab/therapeutic use ; Prospective Studies
    Chemical Substances Antibodies, Monoclonal, Humanized ; C-Reactive Protein (9007-41-4) ; Infliximab (B72HH48FLU) ; vedolizumab (9RV78Q2002)
    Language English
    Publishing date 2023-05-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 1340971-2
    ISSN 1536-4844 ; 1078-0998
    ISSN (online) 1536-4844
    ISSN 1078-0998
    DOI 10.1093/ibd/izad103
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  8. Article ; Online: SARS-CoV-2 Antibodies in Adult Patients With Multiple Sclerosis in the Amsterdam MS Cohort.

    van Kempen, Zoé L E / Strijbis, Eva M M / Al, Marissa M C T / Steenhuis, Maurice / Uitdehaag, Bernard M J / Rispens, Theo / Killestein, Joep

    JAMA neurology

    2021  Volume 78, Issue 7, Page(s) 880–882

    MeSH term(s) Adult ; Aged ; Antibodies, Viral/analysis ; COVID-19/complications ; COVID-19/epidemiology ; COVID-19/immunology ; Cohort Studies ; Female ; Humans ; Male ; Middle Aged ; Multiple Sclerosis/complications ; Multiple Sclerosis/epidemiology ; Netherlands/epidemiology ; Prospective Studies
    Chemical Substances Antibodies, Viral
    Language English
    Publishing date 2021-04-30
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2702023-X
    ISSN 2168-6157 ; 2168-6149
    ISSN (online) 2168-6157
    ISSN 2168-6149
    DOI 10.1001/jamaneurol.2021.1364
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  9. Article ; Online: Incidence and Severity of COVID-19 in Relation to Anti-Receptor-Binding Domain IgG Antibody Level after COVID-19 Vaccination in Kidney Transplant Recipients.

    Messchendorp, A Lianne / Sanders, Jan-Stephan F / Abrahams, Alferso C / Bemelman, Frederike J / Bouwmans, Pim / van den Dorpel, René M A / Hilbrands, Luuk B / Imhof, Céline / Reinders, Marlies E J / Rispens, Theo / Steenhuis, Maurice / Ten Dam, Marc A G J / Vart, Priya / de Vries, Aiko P J / Hemmelder, Marc H / Gansevoort, Ron T / Recovac Investigators

    Viruses

    2024  Volume 16, Issue 1

    Abstract: Kidney transplant recipients (KTRs) elicit an impaired immune response after COVID-19 vaccination; however, the exact clinical impact remains unclear. We therefore analyse the relationship between antibody levels after vaccination and the risk of COVID- ... ...

    Abstract Kidney transplant recipients (KTRs) elicit an impaired immune response after COVID-19 vaccination; however, the exact clinical impact remains unclear. We therefore analyse the relationship between antibody levels after vaccination and the risk of COVID-19 in a large cohort of KTRs. All KTRs living in the Netherlands were invited to send a blood sample 28 days after their second COVID-19 vaccination for measurement of their IgG antibodies against the receptor-binding domain of the SARS-CoV-2 spike protein (anti-RBD IgG). Information on COVID-19 was collected from the moment the blood sample was obtained until 6 months thereafter. Multivariable Cox and logistic regression analyses were performed to analyse which factors affected the occurrence and severity (i.e., hospitalization and/or death) of COVID-19. In total, 12,159 KTRs were approached, of whom 2885 were included in the analyses. Among those, 1578 (54.7%) became seropositive (i.e., anti-RBD IgG level >50 BAU/mL). Seropositivity was associated with a lower risk for COVID-19, also after adjusting for multiple confounders, including socio-economic status and adherence to COVID-19 restrictions (HR 0.37 (0.19-0.47),
    MeSH term(s) Humans ; Incidence ; COVID-19/epidemiology ; COVID-19/prevention & control ; COVID-19 Vaccines ; Kidney Transplantation ; SARS-CoV-2 ; Immunoglobulin G ; Spike Glycoprotein, Coronavirus
    Chemical Substances spike protein, SARS-CoV-2 ; COVID-19 Vaccines ; Immunoglobulin G ; Spike Glycoprotein, Coronavirus
    Language English
    Publishing date 2024-01-12
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2516098-9
    ISSN 1999-4915 ; 1999-4915
    ISSN (online) 1999-4915
    ISSN 1999-4915
    DOI 10.3390/v16010114
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  10. Article ; Online: Longitudinal rheumatoid factor autoantibody responses after SARS-CoV-2 vaccination or infection.

    Keijzer, Sofie / Oskam, Nienke / Ooijevaar-de Heer, Pleuni / Steenhuis, Maurice / Keijser, Jim B D / Wieske, Luuk / van Dam, Koos P J / Stalman, Eileen W / Kummer, Laura Y L / Boekel, Laura / Kuijpers, Taco W / Ten Brinke, Anja / van Ham, S Marieke / Eftimov, Filip / Tas, Sander W / Wolbink, Gerrit J / Rispens, Theo

    Frontiers in immunology

    2024  Volume 15, Page(s) 1314507

    Abstract: Background: Rheumatoid factors (RFs) are autoantibodies that target the Fc region of IgG, and are found in patients with rheumatic diseases as well as in the healthy population. Many studies suggest that an immune trigger may (transiently) elicit RF ... ...

    Abstract Background: Rheumatoid factors (RFs) are autoantibodies that target the Fc region of IgG, and are found in patients with rheumatic diseases as well as in the healthy population. Many studies suggest that an immune trigger may (transiently) elicit RF responses. However, discrepancies between different studies make it difficult to determine if and to which degree RF reactivity can be triggered by vaccination or infection.
    Objective: We quantitatively explored longitudinal RF responses after SARS-CoV-2 vaccination and infection in a well-defined, large cohort using a dual ELISA method that differentiates between true RF reactivity and background IgM reactivity. In addition, we reviewed existing literature on RF responses after vaccination and infection.
    Methods: 151 healthy participants and 30 RA patients were included to measure IgM-RF reactivity before and after SARS-CoV-2 vaccinations by ELISA. Additionally, IgM-RF responses after a SARS-CoV-2 breakthrough infection were studied in 51 healthy participants.
    Results: Published prevalence studies in subjects after infection report up to 85% IgM-RF seropositivity. However, seroconversion studies (both infection and vaccination) report much lower incidences of 2-33%, with a trend of lower percentages observed in larger studies. In the current study, SARS-CoV-2 vaccination triggered low-level IgM-RF responses in 5.5% (8/151) of cases, of which 1.5% (2/151) with a level above 10 AU/mL. Breakthrough infection was accompanied by development of an IgM-RF response in 2% (1/51) of cases.
    Conclusion: Our study indicates that
    MeSH term(s) Humans ; Rheumatoid Factor ; Arthritis, Rheumatoid ; Breakthrough Infections ; COVID-19 Vaccines ; SARS-CoV-2 ; COVID-19/prevention & control ; Autoantibodies ; Immunoglobulin M ; Vaccination
    Chemical Substances Rheumatoid Factor (9009-79-4) ; COVID-19 Vaccines ; Autoantibodies ; Immunoglobulin M
    Language English
    Publishing date 2024-02-29
    Publishing country Switzerland
    Document type Review ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2606827-8
    ISSN 1664-3224 ; 1664-3224
    ISSN (online) 1664-3224
    ISSN 1664-3224
    DOI 10.3389/fimmu.2024.1314507
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