1
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Heck AG, Stickdorn J, Rosenberger LJ, Scherger M, Woller J, Eigen K, Bros M, Grabbe S, Nuhn L. Polymerizable 2-Propionic-3-methylmaleic Anhydrides as a Macromolecular Carrier Platform for pH-Responsive Immunodrug Delivery. J Am Chem Soc 2023; 145:27424-27436. [PMID: 38054646 DOI: 10.1021/jacs.3c08511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
The design of functional polymers coupled with stimuli-triggered drug release mechanisms is a promising achievement to overcome various biological barriers. pH trigger methods yield significant potential for controlled targeting and release of therapeutics due to their simplicity and relevance, especially upon cell internalization. Here, we introduce reactive polymers that conjugate primary or secondary amines and release potential drugs under acidic conditions. For that purpose, we introduced methacrylamide-based monomers with pendant 2-propionic-3-methylmaleic anhydride groups. Such groups allow the conjugation of primary and secondary amines but are resistant to radical polymerization conditions. We, therefore, polymerized 2-propionic-3-methylmaleic anhydride amide-based methacrylates via reversible addition-fragmentation chain transfer (RAFT) polymerization. Their amine-reactive anhydrides could sequentially be derivatized by primary or secondary amines into hydrophilic polymers. Acidic pH-triggered drug release from the polymeric systems was fine-tuned by comparing different amines. Thereby, the conjugation of primary amines led to the formation of irreversible imide bonds in dimethyl sulfoxide, while secondary amines could quantitatively be released upon acidification. In vitro, this installed pH-responsiveness can contribute to an effective release of conjugated immune stimulatory drugs under endosomal pH conditions. Interestingly, the amine-modified polymers generally showed no toxicity and a high cellular uptake. Furthermore, secondary amine-modified immune stimulatory drugs conjugated to the polymers yielded better receptor activity and immune cell maturation than their primary amine derivatives due to their pH-sensitive drug release mechanism. Consequently, 2-propionic-3-methylmaleic anhydride-based polymers can be considered as a versatile platform for pH-triggered delivery of various (immuno)drugs, thus enabling new strategies in macromolecule-assisted immunotherapy.
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Affiliation(s)
- Alina G Heck
- Max Planck Institute for Polymer Research, Mainz 55128, Germany
| | | | - Laura J Rosenberger
- Department of Dermatology, University Medical Center (UMC) of the Johannes Gutenberg-University Mainz, Mainz 55131, Germany
| | | | - Jonas Woller
- Max Planck Institute for Polymer Research, Mainz 55128, Germany
| | - Katharina Eigen
- Institute of Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-Universität Würzburg, Würzburg 97070, Germany
| | - Matthias Bros
- Department of Dermatology, University Medical Center (UMC) of the Johannes Gutenberg-University Mainz, Mainz 55131, Germany
| | - Stephan Grabbe
- Department of Dermatology, University Medical Center (UMC) of the Johannes Gutenberg-University Mainz, Mainz 55131, Germany
| | - Lutz Nuhn
- Max Planck Institute for Polymer Research, Mainz 55128, Germany
- Institute of Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-Universität Würzburg, Würzburg 97070, Germany
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2
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Stickdorn J, Czysch C, Medina-Montano C, Stein L, Xu L, Scherger M, Schild H, Grabbe S, Nuhn L. Peptide-Decorated Degradable Polycarbonate Nanogels for Eliciting Antigen-Specific Immune Responses. Int J Mol Sci 2023; 24:15417. [PMID: 37895096 PMCID: PMC10607756 DOI: 10.3390/ijms242015417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 10/08/2023] [Accepted: 10/19/2023] [Indexed: 10/29/2023] Open
Abstract
For successful therapeutic interventions in cancer immunotherapy, strong antigen-specific immune responses are required. To this end, immunostimulating cues must be combined with antigens to simultaneously arrive at antigen-presenting cells and initiate cellular immune responses. Recently, imidazoquinolines have shown their vast potential as small molecular Toll-like receptor 7/8 (TLR7/8) agonists for immunostimulation when delivered by nanocarriers. At the same time, peptide antigens are promising antigen candidates but require combination with immune-stimulating adjuvants to boost their immunogenicity and exploit their full potential. Consequently, we herein present biodegradable polycarbonate nanogels as versatile delivery system for adjuvants within the particles' core as well as for peptide antigens by surface decoration. For that purpose, orthogonally addressable multifunctional polycarbonate block copolymers were synthesized, enabling adjuvant conjugation through reactive ester chemistry and peptide decoration by strain-promoted alkyne-azide cycloaddition (SPAAC). In preparation for SPAAC, CD4+-specific peptide sequences of the model protein antigen ovalbumin were equipped with DBCO-moieties by site-selective modification at their N-terminal cysteine. With their azide groups exposed on their surface, the adjuvant-loaded nanogels were then efficiently decorated with DBCO-functional CD4+-peptides by SPAAC. In vitro evaluation of the adjuvant-loaded peptide-decorated gels then confirmed their strong immunostimulating properties as well as their high biocompatibility. Despite their covalent conjugation, the CD4+-peptide-decorated nanogels led to maturation of primary antigen-presenting cells and the downstream priming of CD4+-T cells. Subsequently, the peptide-decorated nanogels loaded with TLR7/8 agonist were successfully processed by antigen-presenting cells, enabling potent immune responses for future application in antigen-specific cancer immunotherapy.
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Affiliation(s)
| | | | - Carolina Medina-Montano
- Department of Dermatology, University Medical Center, Johannes Gutenberg-University Mainz, 55131 Mainz, Germany
| | - Lara Stein
- Institute of Immunology, University Medical Center, Johannes Gutenberg-University Mainz, 55131 Mainz, Germany
| | - Lujuan Xu
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
- Zhejiang Cancer Hospital, The Key Laboratory of Zhejiang Province for Aptamers and Theranostics, Hangzhou Institute of Medicine (HIM), Chinese Academy of Sciences, Hangzhou 310022, China
| | | | - Hansjörg Schild
- Institute of Immunology, University Medical Center, Johannes Gutenberg-University Mainz, 55131 Mainz, Germany
| | - Stephan Grabbe
- Department of Dermatology, University Medical Center, Johannes Gutenberg-University Mainz, 55131 Mainz, Germany
| | - Lutz Nuhn
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
- Chair of Macromolecular Chemistry, Institute of Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-Universität Würzburg, 97074 Würzburg, Germany
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3
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Scherger M, Pilger YA, Stickdorn J, Komforth P, Schmitt S, Koynov K, Räder HJ, Nuhn L. Efficient Self-Immolative RAFT End Group Modification for Macromolecular Immunodrug Delivery. Biomacromolecules 2023; 24:2380-2391. [PMID: 37093222 PMCID: PMC10170519 DOI: 10.1021/acs.biomac.3c00239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2023]
Abstract
The reversible addition-fragmentation chain-transfer (RAFT) polymerization provides access to a broad variety of biocompatible and functional macromolecules for diverse polymer-drug conjugates. Due to thiocarbonylthio groups at the ends of each growing polymer chain, they can straightforwardly be converted into disufilde-containing self-immolative motives for reversible drug conjugation by traceless linkers. This may be relevant for RAFT-polymerized poly(N,N-dimethylacrylamide) (pDMA), which has been demonstrated to provide similar properties as poly(ethylene glycol) (PEG) in terms of improving the drug's poor pharmacokinetic profile or enhancing its bioavailability. For that purpose, we established a highly efficient one-pot reaction procedure for introducing various functionalities including both primary and secondary amines and primary alcohols and demonstrated their reversible conjugation and traceless release from pDMA's polymer chain end. Next, a first polymer-drug conjugate with a Toll-like receptor agonist exhibited significantly increased activity in vitro compared to conventional irreversibly covalently fixed variants. Finally, α-ω-bifunctional dye or drug conjugates could be generated by a cholesterol-modified RAFT chain-transfer agent. It facilitated the polymer-drug conjugate's internalization at the cellular level monitored by flow cytometry and confocal imaging. This approach provides the basis for a variety of potentially impactful polymer-drug conjugates by combining versatile small molecular drugs with a plethora of available RAFT polymers through reductive-responsive self-immolative linkers.
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Affiliation(s)
- Maximilian Scherger
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Yannick A Pilger
- Chair of Macromolecular Chemistry, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
| | - Judith Stickdorn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Patric Komforth
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Sascha Schmitt
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Kaloian Koynov
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Hans Joachim Räder
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Lutz Nuhn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Chair of Macromolecular Chemistry, Julius-Maximilians-University Würzburg, Röntgenring 11, 97070 Würzburg, Germany
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4
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Stickdorn J, Stein L, Arnold-Schild D, Hahlbrock J, Medina-Montano C, Bartneck J, Ziß T, Montermann E, Kappel C, Hobernik D, Haist M, Yurugi H, Raabe M, Best A, Rajalingam K, Radsak MP, David SA, Koynov K, Bros M, Grabbe S, Schild H, Nuhn L. Systemically Administered TLR7/8 Agonist and Antigen-Conjugated Nanogels Govern Immune Responses against Tumors. ACS Nano 2022; 16:4426-4443. [PMID: 35103463 PMCID: PMC8945363 DOI: 10.1021/acsnano.1c10709] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The generation of specific humoral and cellular immune responses plays a pivotal role in the development of effective vaccines against tumors. Especially the presence of antigen-specific, cytotoxic T cells influences the outcome of therapeutic cancer vaccinations. Different strategies, ranging from delivering antigen-encoding mRNAs to peptides or full antigens, are accessible but often suffer from insufficient immunogenicity and require immune-boosting adjuvants as well as carrier platforms to ensure stability and adequate retention. Here, we introduce a pH-responsive nanogel platform as a two-component antitumor vaccine that is safe for intravenous application and elicits robust immune responses in vitro and in vivo. The underlying chemical design allows for straightforward covalent attachment of a model antigen (ovalbumin) and an immune adjuvant (imidazoquinoline-type TLR7/8 agonist) onto the same nanocarrier system. In addition to eliciting antigen-specific T and B cell responses that outperform mixtures of individual components, our two-component nanovaccine leads in prophylactic and therapeutic studies to an antigen-specific growth reduction of different tumors expressing ovalbumin intracellularly or on their surface. Regarding the versatile opportunities for functionalization, our nanogels are promising for the development of highly customized and potent nanovaccines.
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Affiliation(s)
- Judith Stickdorn
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Lara Stein
- Institute
of Immunology, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Danielle Arnold-Schild
- Institute
of Immunology, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Jennifer Hahlbrock
- Institute
of Immunology, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Carolina Medina-Montano
- Department
of Dermatology, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Joschka Bartneck
- III Department of Medicine - Hematology, Oncology, Pneumology, University Medical Center of the Johannes Gutenberg-University
Mainz, Langenbeckstraße
1, 55131 Mainz, Germany
| | - Tanja Ziß
- Institute
of Immunology, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Evelyn Montermann
- Department
of Dermatology, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Cinja Kappel
- Department
of Dermatology, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Dominika Hobernik
- Department
of Dermatology, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Maximilian Haist
- Department
of Dermatology, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Hajime Yurugi
- Cell
Biology Unit, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Marco Raabe
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Andreas Best
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Krishnaraj Rajalingam
- Cell
Biology Unit, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Markus P. Radsak
- III Department of Medicine - Hematology, Oncology, Pneumology, University Medical Center of the Johannes Gutenberg-University
Mainz, Langenbeckstraße
1, 55131 Mainz, Germany
| | - Sunil A. David
- ViroVax,
LLC, 2029 Becker Drive
Suite 100E, Lawrence 66047-1620, Kansas. United States
| | - Kaloian Koynov
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Matthias Bros
- Department
of Dermatology, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Stephan Grabbe
- Department
of Dermatology, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Hansjörg Schild
- Institute
of Immunology, University Medical Center
of Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Lutz Nuhn
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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5
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Huppertsberg A, Kaps L, Zhong Z, Schmitt S, Stickdorn J, Deswarte K, Combes F, Czysch C, De Vrieze J, Kasmi S, Choteschovsky N, Klefenz A, Medina-Montano C, Winterwerber P, Chen C, Bros M, Lienenklaus S, Sanders NN, Koynov K, Schuppan D, Lambrecht BN, David SA, De Geest BG, Nuhn L. Squaric Ester-Based, pH-Degradable Nanogels: Modular Nanocarriers for Safe, Systemic Administration of Toll-like Receptor 7/8 Agonistic Immune Modulators. J Am Chem Soc 2021; 143:9872-9883. [PMID: 34166595 PMCID: PMC8267846 DOI: 10.1021/jacs.1c03772] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Indexed: 12/25/2022]
Abstract
Small-molecular Toll-like receptor 7/8 (TLR7/8) agonists hold promise as immune modulators for a variety of immune therapeutic purposes including cancer therapy or vaccination. However, due to their rapid systemic distribution causing difficult-to-control inflammatory off-target effects, their application is still problematic, in particular systemically. To address this problem, we designed and robustly fabricated pH-responsive nanogels serving as versatile immunodrug nanocarriers for safe delivery of TLR7/8-stimulating imidazoquinolines after intravenous administration. To this aim, a primary amine-reactive methacrylamide monomer bearing a pendant squaric ester amide is introduced, which is polymerized under controlled RAFT polymerization conditions. Corresponding PEG-derived squaric ester amide block copolymers self-assemble into precursor micelles in polar protic solvents. Their cores are amine-reactive and can sequentially be transformed by acid-sensitive cross-linkers, dyes, and imidazoquinolines. Remaining squaric ester amides are hydrophilized affording fully hydrophilic nanogels with profound stability in human plasma but stimuli-responsive degradation upon exposure to endolysosomal pH conditions. The immunomodulatory behavior of the imidazoquinolines alone or conjugated to the nanogels was demonstrated by macrophages in vitro. In vivo, however, we observed a remarkable impact of the nanogel: After intravenous injection, a spatially controlled immunostimulatory activity was evident in the spleen, whereas systemic off-target inflammatory responses triggered by the small-molecular imidazoquinoline analogue were absent. These findings underline the potential of squaric ester-based, pH-degradable nanogels as a promising platform to permit intravenous administration routes of small-molecular TLR7/8 agonists and, thus, the opportunity to explore their adjuvant potency for systemic vaccination or cancer immunotherapy purposes.
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Affiliation(s)
| | - Leonard Kaps
- Institute
for Translational Immunology and Research Center for Immune Therapy,
University Medical Center, Johannes Gutenberg-University
Mainz, 55131 Mainz, Germany
- Department
of Internal Medicine I, University Medical
Center of the Johannes Gutenberg-University Mainz, 55131 Mainz, Germany
| | - Zifu Zhong
- Department
of Pharmaceutics and Cancer Research Institute Ghent (CRIG), Ghent University, Ghent 9000, Belgium
| | - Sascha Schmitt
- Max
Planck Institute for Polymer Research, 55128 Mainz, Germany
| | | | - Kim Deswarte
- Department
of Internal Medicine and Pediatrics, Ghent
University, VIB Center for Inflammation Research, Ghent 9052, Belgium
| | - Francis Combes
- Laboratory
of Gene Therapy, Department of Nutrition, Genetics and Ethology, Ghent University, Merelbeke 9820, Belgium
| | | | - Jana De Vrieze
- Department
of Pharmaceutics and Cancer Research Institute Ghent (CRIG), Ghent University, Ghent 9000, Belgium
| | - Sabah Kasmi
- Department
of Pharmaceutics and Cancer Research Institute Ghent (CRIG), Ghent University, Ghent 9000, Belgium
| | - Niklas Choteschovsky
- Institute
for Translational Immunology and Research Center for Immune Therapy,
University Medical Center, Johannes Gutenberg-University
Mainz, 55131 Mainz, Germany
| | - Adrian Klefenz
- Institute
for Translational Immunology and Research Center for Immune Therapy,
University Medical Center, Johannes Gutenberg-University
Mainz, 55131 Mainz, Germany
| | - Carolina Medina-Montano
- Department
of Dermatology, University Medical Center
of Johannes Gutenberg-University Mainz, 55131 Mainz, Germany
| | | | - Chaojian Chen
- Max
Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Matthias Bros
- Department
of Dermatology, University Medical Center
of Johannes Gutenberg-University Mainz, 55131 Mainz, Germany
| | - Stefan Lienenklaus
- Institute
for Laboratory Animal Science and Institute of Immunology, Hannover Medical School, 30625 Hannover, Germany
| | - Niek N. Sanders
- Laboratory
of Gene Therapy, Department of Nutrition, Genetics and Ethology, Ghent University, Merelbeke 9820, Belgium
| | - Kaloian Koynov
- Max
Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Detlef Schuppan
- Institute
for Translational Immunology and Research Center for Immune Therapy,
University Medical Center, Johannes Gutenberg-University
Mainz, 55131 Mainz, Germany
- Division
of Gastroenterology, Beth Israel Deaconess
Medical Center, Harvard Medical School, Boston, Massachusetts 02215, United States
| | - Bart N. Lambrecht
- Department
of Internal Medicine and Pediatrics, Ghent
University, VIB Center for Inflammation Research, Ghent 9052, Belgium
- Department
of Pulmonary Medicine, Erasmus University
Medical Center, Rotterdam 3015, Netherlands
| | | | - Bruno G. De Geest
- Department
of Pharmaceutics and Cancer Research Institute Ghent (CRIG), Ghent University, Ghent 9000, Belgium
| | - Lutz Nuhn
- Max
Planck Institute for Polymer Research, 55128 Mainz, Germany
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6
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Bolli E, Scherger M, Arnouk SM, Pombo Antunes AR, Straßburger D, Urschbach M, Stickdorn J, De Vlaminck K, Movahedi K, Räder HJ, Hernot S, Besenius P, Van Ginderachter JA, Nuhn L. Targeted Repolarization of Tumor-Associated Macrophages via Imidazoquinoline-Linked Nanobodies. Adv Sci (Weinh) 2021; 8:2004574. [PMID: 34026453 PMCID: PMC8132149 DOI: 10.1002/advs.202004574] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 01/14/2021] [Indexed: 05/06/2023]
Abstract
Tumor-associated macrophages (TAMs) promote the immune suppressive microenvironment inside tumors and are, therefore, considered as a promising target for the next generation of cancer immunotherapies. To repolarize their phenotype into a tumoricidal state, the Toll-like receptor 7/8 agonist imidazoquinoline IMDQ is site-specifically and quantitatively coupled to single chain antibody fragments, so-called nanobodies, targeting the macrophage mannose receptor (MMR) on TAMs. Intravenous injection of these conjugates result in a tumor- and cell-specific delivery of IMDQ into MMRhigh TAMs, causing a significant decline in tumor growth. This is accompanied by a repolarization of TAMs towards a pro-inflammatory phenotype and an increase in anti-tumor T cell responses. Therefore, the therapeutic benefit of such nanobody-drug conjugates may pave the road towards effective macrophage re-educating cancer immunotherapies.
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Affiliation(s)
- Evangelia Bolli
- Lab of Cellular and Molecular ImmunologyVrije Universiteit BrusselPleinlaan 2Brussels1050Belgium
- Myeloid Cell Immunology LabVIB Center for Inflammation ResearchBrussels1050Belgium
| | | | - Sana M. Arnouk
- Lab of Cellular and Molecular ImmunologyVrije Universiteit BrusselPleinlaan 2Brussels1050Belgium
- Myeloid Cell Immunology LabVIB Center for Inflammation ResearchBrussels1050Belgium
| | - Ana Rita Pombo Antunes
- Lab of Cellular and Molecular ImmunologyVrije Universiteit BrusselPleinlaan 2Brussels1050Belgium
- Myeloid Cell Immunology LabVIB Center for Inflammation ResearchBrussels1050Belgium
| | - David Straßburger
- Department of ChemistryJohannes Gutenberg‐University MainzDuesbergweg 10‐14Mainz55128Germany
| | - Moritz Urschbach
- Department of ChemistryJohannes Gutenberg‐University MainzDuesbergweg 10‐14Mainz55128Germany
| | - Judith Stickdorn
- Max Planck Institute for Polymer ResearchAckermannweg 10Mainz55128Germany
| | - Karen De Vlaminck
- Lab of Cellular and Molecular ImmunologyVrije Universiteit BrusselPleinlaan 2Brussels1050Belgium
- Myeloid Cell Immunology LabVIB Center for Inflammation ResearchBrussels1050Belgium
| | - Kiavash Movahedi
- Lab of Cellular and Molecular ImmunologyVrije Universiteit BrusselPleinlaan 2Brussels1050Belgium
- Myeloid Cell Immunology LabVIB Center for Inflammation ResearchBrussels1050Belgium
| | - Hans Joachim Räder
- Max Planck Institute for Polymer ResearchAckermannweg 10Mainz55128Germany
| | - Sophie Hernot
- Laboratory of In Vivo Cellular and Molecular ImagingVrije Universiteit BrusselLaarbeeklaan 103Brussels1090Belgium
| | - Pol Besenius
- Department of ChemistryJohannes Gutenberg‐University MainzDuesbergweg 10‐14Mainz55128Germany
| | - Jo A. Van Ginderachter
- Lab of Cellular and Molecular ImmunologyVrije Universiteit BrusselPleinlaan 2Brussels1050Belgium
- Myeloid Cell Immunology LabVIB Center for Inflammation ResearchBrussels1050Belgium
| | - Lutz Nuhn
- Max Planck Institute for Polymer ResearchAckermannweg 10Mainz55128Germany
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7
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Kockelmann J, Stickdorn J, Kasmi S, De Vrieze J, Pieszka M, Ng DYW, David SA, De Geest BG, Nuhn L. Control over Imidazoquinoline Immune Stimulation by pH-Degradable Poly(norbornene) Nanogels. Biomacromolecules 2020; 21:2246-2257. [PMID: 32255626 PMCID: PMC7304817 DOI: 10.1021/acs.biomac.0c00205] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
![]()
The
reactivation of the innate immune system by toll-like receptor
(TLR) agonists holds promise for anticancer immunotherapy. Severe
side effects caused by unspecific and systemic activation of the immune
system upon intravenous injection prevent the use of small-molecule
TLR agonists for such purposes. However, a covalent attachment of
small-molecule imidazoquinoline (IMDQ) TLR7/8 agonists to pH-degradable
polymeric nanogels could be shown to drastically reduce the systemic
inflammation but retain the activity to tumoral tissues and their
draining lymph nodes. Here, we introduce the synthesis of poly(norbornene)-based,
acid-degradable nanogels for the covalent ligation of IMDQs. While
the intact nanogels trigger sufficient TLR7/8 receptor stimulation,
their degraded version of soluble, IMDQ-conjugated poly(norbornene)
chains hardly activates TLR7/8. This renders their clinical safety
profile, as degradation products are obtained, which would not only
circumvent nanoparticle accumulation in the body but also provide
nonactive, polymer-bound IMDQ species. Their immunologically silent
behavior guarantees both spatial and temporal control over immune
activity and, thus, holds promise for improved clinical applications.
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Affiliation(s)
- Johannes Kockelmann
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Judith Stickdorn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Sabah Kasmi
- Department of Pharmaceutics, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
| | - Jana De Vrieze
- Department of Pharmaceutics, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
| | - Michaela Pieszka
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - David Yuen W Ng
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Sunil A David
- Department of Medicinal Chemistry, University of Minnesota, 2231 Sixth Street SE, Minneapolis, Minnesota 55455, United States
| | - Bruno G De Geest
- Department of Pharmaceutics, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
| | - Lutz Nuhn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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8
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9
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Abstract
Amphiphilic poly(esteracetal) micelles encapsulate potent immune modulatory drugs, but fall apart and release them upon dual pH or enzymatic stimuli.
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Affiliation(s)
- Leon Bixenmann
- Max Planck Institute for Polymer Research
- 55128 Mainz
- Germany
| | | | - Lutz Nuhn
- Max Planck Institute for Polymer Research
- 55128 Mainz
- Germany
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