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  1. Article ; Online: Exciting Times for Lipid Nanoparticles: How Canadian Discoveries Are Enabling Gene Therapies.

    Cheng, Miffy H Y / Brimacombe, Cedric A / Verbeke, Rein / Cullis, Pieter R

    Molecular pharmaceutics

    2022  Volume 19, Issue 6, Page(s) 1663–1668

    Abstract: In this brief perspective, we describe key events in the history of the lipid-based nanomedicine field, highlight Canadian contributions, and outline areas where lipid nanoparticle technology is poised to have a transformative effect on the future of ... ...

    Abstract In this brief perspective, we describe key events in the history of the lipid-based nanomedicine field, highlight Canadian contributions, and outline areas where lipid nanoparticle technology is poised to have a transformative effect on the future of medicine.
    MeSH term(s) CRISPR-Cas Systems ; Canada ; Gene Editing ; Liposomes ; Nanoparticles
    Chemical Substances Lipid Nanoparticles ; Liposomes
    Language English
    Publishing date 2022-05-18
    Publishing country United States
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't
    ZDB-ID 2138405-8
    ISSN 1543-8392 ; 1543-8384
    ISSN (online) 1543-8392
    ISSN 1543-8384
    DOI 10.1021/acs.molpharmaceut.2c00365
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Innate immune mechanisms of mRNA vaccines.

    Verbeke, Rein / Hogan, Michael J / Loré, Karin / Pardi, Norbert

    Immunity

    2022  Volume 55, Issue 11, Page(s) 1993–2005

    Abstract: The lipid nanoparticle (LNP)-encapsulated, nucleoside-modified mRNA platform has been used to generate safe and effective vaccines in record time against COVID-19. Here, we review the current understanding of the manner whereby mRNA vaccines induce ... ...

    Abstract The lipid nanoparticle (LNP)-encapsulated, nucleoside-modified mRNA platform has been used to generate safe and effective vaccines in record time against COVID-19. Here, we review the current understanding of the manner whereby mRNA vaccines induce innate immune activation and how this contributes to protective immunity. We discuss innate immune sensing of mRNA vaccines at the cellular and intracellular levels and consider the contribution of both the mRNA and the LNP components to their immunogenicity. A key message that is emerging from recent observations is that the LNP carrier acts as a powerful adjuvant for this novel vaccine platform. In this context, we highlight important gaps in understanding and discuss how new insight into the mechanisms underlying the effectiveness of mRNA-LNP vaccines may enable tailoring mRNA and carrier molecules to develop vaccines with greater effectiveness and milder adverse events in the future.
    MeSH term(s) Humans ; COVID-19/prevention & control ; Vaccines, Synthetic ; RNA, Messenger/genetics ; Immunity, Innate ; mRNA Vaccines
    Chemical Substances Lipid Nanoparticles ; Vaccines, Synthetic ; RNA, Messenger
    Language English
    Publishing date 2022-11-04
    Publishing country United States
    Document type Journal Article ; Review ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1217235-2
    ISSN 1097-4180 ; 1074-7613
    ISSN (online) 1097-4180
    ISSN 1074-7613
    DOI 10.1016/j.immuni.2022.10.014
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: The dawn of mRNA vaccines: The COVID-19 case.

    Verbeke, Rein / Lentacker, Ine / De Smedt, Stefaan C / Dewitte, Heleen

    Journal of controlled release : official journal of the Controlled Release Society

    2021  Volume 333, Page(s) 511–520

    Abstract: In less than one year since the outbreak of the COVID-19 pandemic, two mRNA-based vaccines, BNT162b2 and mRNA-1273, were granted the first historic authorization for emergency use, while another mRNA vaccine, CVnCoV, progressed to phase 3 clinical ... ...

    Abstract In less than one year since the outbreak of the COVID-19 pandemic, two mRNA-based vaccines, BNT162b2 and mRNA-1273, were granted the first historic authorization for emergency use, while another mRNA vaccine, CVnCoV, progressed to phase 3 clinical testing. The COVID-19 mRNA vaccines represent a new class of vaccine products, which consist of synthetic mRNA strands encoding the SARS-CoV-2 Spike glycoprotein, packaged in lipid nanoparticles to deliver mRNA to cells. This review digs deeper into the scientific breakthroughs of the last decades that laid the foundations for the rapid rise of mRNA vaccines during the COVID-19 pandemic. As well as providing momentum for mRNA vaccines, SARS-CoV-2 represents an ideal case study allowing to compare design-activity differences between the different mRNA vaccine candidates. Therefore, a detailed overview of the composition and (pre)clinical performance of the three most advanced mRNA vaccines is provided and the influence of choices in their structural design on to their immunogenicity and reactogenicity profile is discussed in depth. In addition to the new fundamental insights in the mRNA vaccines' mode of action highlighted here, we also point out which unknowns remain that require further investigation and possibly, optimization in future mRNA vaccine development.
    MeSH term(s) BNT162 Vaccine ; COVID-19 ; COVID-19 Vaccines ; Humans ; Pandemics ; RNA, Messenger ; SARS-CoV-2 ; Vaccines
    Chemical Substances COVID-19 Vaccines ; RNA, Messenger ; Vaccines ; BNT162 Vaccine (N38TVC63NU)
    Language English
    Publishing date 2021-03-30
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 632533-6
    ISSN 1873-4995 ; 0168-3659
    ISSN (online) 1873-4995
    ISSN 0168-3659
    DOI 10.1016/j.jconrel.2021.03.043
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Alpha-galactosylceramide improves the potency of mRNA LNP vaccines against cancer and intracellular bacteria.

    Meulewaeter, Sofie / Aernout, Ilke / Deprez, Joke / Engelen, Yanou / De Velder, Margo / Franceschini, Lorenzo / Breckpot, Karine / Van Calenbergh, Serge / Asselman, Caroline / Boucher, Katie / Impens, Francis / De Smedt, Stefaan C / Verbeke, Rein / Lentacker, Ine

    Journal of controlled release : official journal of the Controlled Release Society

    2024  

    Abstract: Although various types of mRNA-based vaccines have been explored, the optimal conditions for induction of both humoral and cellular immunity remain rather unknown. In this study, mRNA vaccines of nucleoside-modified mRNA in lipoplexes (LPXs) or lipid ... ...

    Abstract Although various types of mRNA-based vaccines have been explored, the optimal conditions for induction of both humoral and cellular immunity remain rather unknown. In this study, mRNA vaccines of nucleoside-modified mRNA in lipoplexes (LPXs) or lipid nanoparticles (LNPs) were evaluated after administration in mice through different routes, assessing mRNA delivery, tolerability and immunogenicity. In addition, we investigated whether mRNA vaccines could benefit from the inclusion of the adjuvant alpha-galactosylceramide (αGC), an invariant Natural Killer T (NKT) cell ligand. Intramuscular (IM) vaccination with ovalbumin (OVA)-encoding mRNA encapsulated in LNPs adjuvanted with αGC showed the highest antibody- and CD8
    Language English
    Publishing date 2024-04-30
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 632533-6
    ISSN 1873-4995 ; 0168-3659
    ISSN (online) 1873-4995
    ISSN 0168-3659
    DOI 10.1016/j.jconrel.2024.04.052
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Continuous freeze-drying of messenger RNA lipid nanoparticles enables storage at higher temperatures.

    Meulewaeter, Sofie / Nuytten, Gust / Cheng, Miffy H Y / De Smedt, Stefaan C / Cullis, Pieter R / De Beer, Thomas / Lentacker, Ine / Verbeke, Rein

    Journal of controlled release : official journal of the Controlled Release Society

    2023  Volume 357, Page(s) 149–160

    Abstract: Messenger RNA (mRNA) lipid nanoparticles (LNPs) have emerged at the forefront during the COVID-19 vaccination campaign. Despite their tremendous success, mRNA vaccines currently require storage at deep freeze temperatures which complicates their storage ... ...

    Abstract Messenger RNA (mRNA) lipid nanoparticles (LNPs) have emerged at the forefront during the COVID-19 vaccination campaign. Despite their tremendous success, mRNA vaccines currently require storage at deep freeze temperatures which complicates their storage and distribution, and ultimately leads to lower accessibility to low- and middle-income countries. To elaborate on this challenge, we investigated freeze-drying as a method to enable storage of mRNA LNPs at room- and even higher temperatures. More specifically, we explored a novel continuous freeze-drying technique based on spin-freezing, which has several advantages compared to classical batch freeze-drying including a much shorter drying time and improved process and product quality controlling. Here, we give insight into the variables that play a role during freeze-drying by evaluating the impact of the buffer and mRNA LNP formulation (ionizable lipid to mRNA weight ratio) on properties such as size, morphology and mRNA encapsulation. We found that a sufficiently high ionizable lipid to mRNA weight ratio was necessary to prevent leakage of mRNA during freeze-drying and that phosphate and Tris, but not PBS, were appropriate buffers for lyophilization of mRNA LNPs. We also studied the stability of optimally lyophilized mRNA LNPs at 4 °C, 22 °C, and 37 °C and found that transfection properties of lyophilized mRNA LNPs were maintained during at least 12 weeks. To our knowledge, this is the first study that demonstrates that optimally lyophilized mRNA LNPs can be safely stored at higher temperatures for months without losing their transfection properties.
    MeSH term(s) Humans ; Temperature ; RNA, Messenger ; COVID-19 Vaccines ; COVID-19 ; Freeze Drying/methods ; Nanoparticles ; Lipids
    Chemical Substances Lipid Nanoparticles ; RNA, Messenger ; COVID-19 Vaccines ; Lipids
    Language English
    Publishing date 2023-03-30
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 632533-6
    ISSN 1873-4995 ; 0168-3659
    ISSN (online) 1873-4995
    ISSN 0168-3659
    DOI 10.1016/j.jconrel.2023.03.039
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: The dawn of mRNA vaccines: The COVID-19 case

    Verbeke, Rein / Lentacker, Ine / De Smedt, Stefaan C / Dewitte, Heleen

    Journal of controlled release. 2021 May 10, v. 333

    2021  

    Abstract: In less than one year since the outbreak of the COVID-19 pandemic, two mRNA-based vaccines, BNT162b2 and mRNA-1273, were granted the first historic authorization for emergency use, while another mRNA vaccine, CVnCoV, progressed to phase 3 clinical ... ...

    Abstract In less than one year since the outbreak of the COVID-19 pandemic, two mRNA-based vaccines, BNT162b2 and mRNA-1273, were granted the first historic authorization for emergency use, while another mRNA vaccine, CVnCoV, progressed to phase 3 clinical testing. The COVID-19 mRNA vaccines represent a new class of vaccine products, which consist of synthetic mRNA strands encoding the SARS-CoV-2 Spike glycoprotein, packaged in lipid nanoparticles to deliver mRNA to cells. This review digs deeper into the scientific breakthroughs of the last decades that laid the foundations for the rapid rise of mRNA vaccines during the COVID-19 pandemic. As well as providing momentum for mRNA vaccines, SARS-CoV-2 represents an ideal case study allowing to compare design-activity differences between the different mRNA vaccine candidates. Therefore, a detailed overview of the composition and (pre)clinical performance of the three most advanced mRNA vaccines is provided and the influence of choices in their structural design on to their immunogenicity and reactogenicity profile is discussed in depth. In addition to the new fundamental insights in the mRNA vaccines' mode of action highlighted here, we also point out which unknowns remain that require further investigation and possibly, optimization in future mRNA vaccine development.
    Keywords COVID-19 infection ; Severe acute respiratory syndrome coronavirus 2 ; case studies ; glycoproteins ; immunogenicity ; lipids ; mechanism of action ; momentum ; vaccine development ; vaccines
    Language English
    Dates of publication 2021-0510
    Size p. 511-520.
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-light
    ZDB-ID 632533-6
    ISSN 1873-4995 ; 0168-3659
    ISSN (online) 1873-4995
    ISSN 0168-3659
    DOI 10.1016/j.jconrel.2021.03.043
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Fluorine MR Imaging Probes Dynamic Migratory Profiles of Perfluorocarbon-Loaded Dendritic Cells After Streptozotocin-Induced Inflammation.

    Saini, Shweta / Vanherwegen, An-Sofie / Liang, Sayuan / Verbeke, Rein / Korf, Hannelie / Lentacker, Ine / De Smedt, Stefaan C / Gysemans, Conny / Himmelreich, Uwe

    Molecular imaging and biology

    2022  Volume 24, Issue 2, Page(s) 321–332

    Abstract: Purpose: The pathogenesis of type 1 diabetes (T1D) involves presentation of islet-specific self-antigens by dendritic cells (DCs) to autoreactive T cells, resulting in the destruction of insulin-producing pancreatic beta cells. We aimed to study the ... ...

    Abstract Purpose: The pathogenesis of type 1 diabetes (T1D) involves presentation of islet-specific self-antigens by dendritic cells (DCs) to autoreactive T cells, resulting in the destruction of insulin-producing pancreatic beta cells. We aimed to study the dynamic homing of diabetes-prone DCs to the pancreas and nearby organs with and without induction of pancreatic stress in a T1D susceptible model of repeated streptozotocin (STZ) injection.
    Procedures: In vitro labeling of activated bone marrow-derived DCs (BMDCs) from NOD (Nonobese diabetes) mice was performed using zonyl perfluoro-15-crown-5-ether nanoparticles (ZPFCE-NPs). Internalization of particles was confirmed by confocal microscopy. Two groups of NOD.SCID (nonobese diabetic/severe combined immunodeficiency) mice with (induced by low dose STZ administration) or without pancreatic stress were compared. Diabetogenic BMDCs loaded with BDC2.5 mimotope were pre-labeled with ZPFCE-NPs and adoptively transferred into mice. Longitudinal in vivo fluorine MRI (
    Results: In vitro flow cytometry and confocal microscopy confirmed high uptake of nanoparticles in BMDCs during the process of maturation. Migration/homing of activated and ZPFCE-NP- labeled BMDCs to different organs was monitored and quantified longitudinally, showing highest cell density in pancreas at 48-h time-point. Based on
    Conclusion: We showed the potential of
    MeSH term(s) Animals ; Dendritic Cells ; Diabetes Mellitus, Type 1 ; Fluorine ; Fluorocarbons ; Inflammation ; Magnetic Resonance Imaging/methods ; Mice ; Mice, Inbred NOD ; Mice, SCID ; Streptozocin
    Chemical Substances Fluorocarbons ; Fluorine (284SYP0193) ; Streptozocin (5W494URQ81)
    Language English
    Publishing date 2022-01-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2079160-4
    ISSN 1860-2002 ; 1536-1632
    ISSN (online) 1860-2002
    ISSN 1536-1632
    DOI 10.1007/s11307-021-01701-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Considerations on the Design of Lipid-based mRNA Vaccines Against Cancer.

    Meulewaeter, Sofie / Zhang, Yao / Wadhwa, Abishek / Fox, Kevin / Lentacker, Ine / Harder, Kenneth W / Cullis, Pieter R / De Smedt, Stefaan C / Cheng, Miffy H Y / Verbeke, Rein

    Journal of molecular biology

    2023  Volume 436, Issue 2, Page(s) 168385

    Abstract: Throughout the last decades, mRNA vaccines have been developed as a cancer immunotherapeutic and the technology recently gained momentum during the COVID-19 pandemic. Recent promising results obtained from clinical trials investigating lipid-based mRNA ... ...

    Abstract Throughout the last decades, mRNA vaccines have been developed as a cancer immunotherapeutic and the technology recently gained momentum during the COVID-19 pandemic. Recent promising results obtained from clinical trials investigating lipid-based mRNA vaccines in cancer therapy further highlighted the potential of this therapy. Interestingly, while the technologies being used in authorized mRNA vaccines for the prevention of COVID-19 are relatively similar, mRNA vaccines in clinical development for cancer vaccination show marked differences in mRNA modification, lipid carrier, and administration route. In this review, we describe findings on how these factors can impact the potency of mRNA vaccines in cancer therapy and provide insights into the complex interplay between them. We discuss how lipid carrier composition can affect passive targeting to immune cells to improve the efficacy and safety of mRNA vaccines. Finally, we summarize strategies that are established or still being explored to improve the efficacy of mRNA cancer vaccines and include next-generation vaccines that are on the horizon in clinical development.
    MeSH term(s) Humans ; Lipids ; mRNA Vaccines ; Neoplasms/therapy ; Cancer Vaccines ; Vaccine Development/methods
    Chemical Substances Lipids ; mRNA Vaccines ; Cancer Vaccines
    Language English
    Publishing date 2023-12-06
    Publishing country Netherlands
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't
    ZDB-ID 80229-3
    ISSN 1089-8638 ; 0022-2836
    ISSN (online) 1089-8638
    ISSN 0022-2836
    DOI 10.1016/j.jmb.2023.168385
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: TCR transgenic clone selection guided by immune receptor analysis and single cell RNA expression of polyclonal responders

    Debeuf, Nincy / Lameire, Sahine / Vanheerswynghels, Manon / Deckers, Julie / De Wolf, Caroline / Toussaint, Wendy / Verbeke, Rein / Verstaen, Kevin / Hammad, Hamida / Vanhee, Stijn / Lambrecht, Bart N.

    bioRxiv

    Abstract: Since the precursor frequency of naive T cells is extremely low, investigating the early steps of antigen-specific T cell activation is challenging. To overcome this detection problem, adoptive transfer of a cohort of T cells purified from T cell ... ...

    Abstract Since the precursor frequency of naive T cells is extremely low, investigating the early steps of antigen-specific T cell activation is challenging. To overcome this detection problem, adoptive transfer of a cohort of T cells purified from T cell receptor (TCR) transgenic donors has been extensively used but is not readily available for emerging pathogens. Constructing TCR transgenic mice from T cell hybridomas is a labor-intensive and sometimes erratic process, since the best clones are selected based on antigen-induced CD69 upregulation or IL-2 production in vitro, and TCR chains are PCR-cloned into expression vectors. Here, we exploited the rapid advances in single cell sequencing and TCR repertoire analysis to select the best clones without hybridoma selection, and generated CORSET8 mice (CORona Spike Epitope specific CD8 T cell), carrying a TCR specific for the Spike protein of SARS-CoV-2. Implementing newly created DALI software for TCR repertoire analysis in single cell analysis enabled the rapid selection of the ideal responder CD8 T cell clone, based on antigen reactivity, proliferation and immunophenotype in vivo. In contrast, a traditional method based on hybridoma technology was unsuccessful. Identified TCR sequences were inserted as synthetic DNA into an expression vector and transgenic CORSET8 donor mice were created. After immunization with Spike/CpG-motifs, mRNA vaccination or SARS-CoV2 infection, CORSET8 T cells strongly proliferated and showed signs of T cell activation. Thus, a combination of TCR repertoire analysis and scRNA immunophenotyping allowed rapid selection of antigen-specific TCR sequences that can be used to generate TCR transgenic mice.
    Keywords covid19
    Language English
    Publishing date 2024-03-27
    Publisher Cold Spring Harbor Laboratory
    Document type Article ; Online
    DOI 10.1101/2024.03.27.586931
    Database COVID19

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  10. Article ; Online: Nanobody-mediated SPECT/CT imaging reveals the spatiotemporal expression of programmed death-ligand 1 in response to a CD8

    Ertveldt, Thomas / Meulewaeter, Sofie / De Vlaeminck, Yannick / Olarte, Oscar / Broos, Katrijn / Van Calenbergh, Serge / Bourgeois, Stephanie / Deprez, Joke / Heremans, Yves / Goyvaerts, Cleo / Staels, Willem / De Smedt, Stefaan / Dewitte, Heleen / Devoogdt, Nick / Keyaerts, Marleen / Verbeke, Rein / Barbé, Kurt / Lentacker, Ine / Breckpot, Karine

    Theranostics

    2023  Volume 13, Issue 15, Page(s) 5483–5500

    Abstract: Rationale: ...

    Abstract Rationale:
    MeSH term(s) Humans ; Mice ; Animals ; B7-H1 Antigen ; Natural Killer T-Cells/metabolism ; Single-Domain Antibodies/metabolism ; Immune Checkpoint Inhibitors/metabolism ; Programmed Cell Death 1 Receptor/metabolism ; CD8-Positive T-Lymphocytes ; Tomography, Emission-Computed, Single-Photon ; Tomography, X-Ray Computed ; Vaccines, Synthetic ; Melanoma/diagnostic imaging ; Melanoma/therapy ; Tumor Microenvironment ; mRNA Vaccines
    Chemical Substances CD274 protein, human ; B7-H1 Antigen ; Single-Domain Antibodies ; Immune Checkpoint Inhibitors ; Programmed Cell Death 1 Receptor ; Vaccines, Synthetic
    Language English
    Publishing date 2023-10-09
    Publishing country Australia
    Document type Journal Article
    ZDB-ID 2592097-2
    ISSN 1838-7640 ; 1838-7640
    ISSN (online) 1838-7640
    ISSN 1838-7640
    DOI 10.7150/thno.85106
    Database MEDical Literature Analysis and Retrieval System OnLINE

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