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Krutzek F, Donat CK, Stadlbauer S. Chelator impact: investigating the pharmacokinetic behavior of copper-64 labeled PD-L1 radioligands. EJNMMI Radiopharm Chem 2024; 9:14. [PMID: 38372838 PMCID: PMC10876507 DOI: 10.1186/s41181-024-00243-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 02/05/2024] [Indexed: 02/20/2024] Open
Abstract
BACKGROUND Programmed cell death ligand 1 (PD-L1) plays a critical role in the tumor microenvironment and overexpression in several solid cancers has been reported. This was associated with a downregulation of the local immune response, specifically of T-cells. Immune checkpoint inhibitors showed a potential to break this localized immune paralysis, but only 30% of patients are considered responders. New diagnostic approaches are therefore needed to determine patient eligibility. Small molecule radiotracers targeting PD-L1, may serve as such diagnostic tools, addressing the heterogeneous PD-L1 expression between and within tumor lesions, thus aiding in therapy decisions. RESULTS Four biphenyl-based small-molecule PD-L1 ligands were synthesized using a convergent synthetic route with a linear sequence of up to eleven steps. As a chelator NODA-GA, CB-TE2A or DiAmSar was used to allow radiolabeling with copper-64 ([64Cu]Cu-14-[64Cu]Cu-16). In addition, a dimeric structure based on DiAmSar was synthesized ([64Cu]Cu-17). All four radioligands exhibited high proteolytic stability (> 95%) up to 48 h post-radiolabeling. Saturation binding yielded moderate affinities toward PD-L1, ranging from 100 to 265 nM. Real-time radioligand binding provided more promising KD values around 20 nM for [64Cu]Cu-14 and [64Cu]Cu-15. In vivo PET imaging in mice bearing both PC3 PD-L1 overexpressing and PD-L1-mock tumors was performed at 0-2, 4-5 and 24-25 h post injection (p.i.). This revealed considerably different pharmacokinetic profiles, depending on the substituted chelator. [64Cu]Cu-14, substituted with NODA-GA, showed renal clearance with low liver uptake, whereas substitution with the cross-bridged cyclam chelator CB-TE2A resulted in a primarily hepatobiliary clearance. Notably, the monomeric DiAmSar radioligand [64Cu]Cu-16 demonstrated a higher liver uptake than [64Cu]Cu-15, but was still renally cleared as evidenced by the lack of uptake in gall bladder and intestines. The dimeric structure [64Cu]Cu-17 showed extensive accumulation and trapping in the liver but was also cleared via the renal pathway. Of all tracer candidates and across all timepoints, [64Cu]Cu-17 showed the highest accumulation at 24 h p.i. in the PD-L1-overexpressing tumor of all timepoints and all radiotracers, indicating drastically increased circulation time upon dimerization of two PD-L1 binding motifs. CONCLUSIONS This study shows that chelator choice significantly influences the pharmacokinetic profile of biphenyl-based small molecule PD-L1 radioligands. The NODA-GA-conjugated radioligand [64Cu]Cu-14 exhibited favorable renal clearance; however, the limited uptake in tumors suggests the need for structural modifications to the binding motif for future PD-L1 radiotracers.
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Affiliation(s)
- Fabian Krutzek
- Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328, Dresden, Germany
| | - Cornelius K Donat
- Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328, Dresden, Germany
| | - Sven Stadlbauer
- Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328, Dresden, Germany.
- School of Science, Faculty of Chemistry and Food Chemistry, Technical University Dresden, 01069, Dresden, Germany.
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Song J, Jeong BS, Kim SW, Im SB, Kim S, Lai CJ, Cho W, Jung JU, Ahn MJ, Oh BH. Noncovalent antibody catenation on a target surface greatly increases the antigen-binding avidity. eLife 2023; 12:e81646. [PMID: 37249578 PMCID: PMC10229114 DOI: 10.7554/elife.81646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Accepted: 05/11/2023] [Indexed: 05/31/2023] Open
Abstract
Immunoglobulin G (IgG) antibodies are widely used for diagnosis and therapy. Given the unique dimeric structure of IgG, we hypothesized that, by genetically fusing a homodimeric protein (catenator) to the C-terminus of IgG, reversible catenation of antibody molecules could be induced on a surface where target antigen molecules are abundant, and that it could be an effective way to greatly enhance the antigen-binding avidity. A thermodynamic simulation showed that quite low homodimerization affinity of a catenator, e.g. dissociation constant of 100 μM, can enhance nanomolar antigen-binding avidity to a picomolar level, and that the fold enhancement sharply depends on the density of the antigen. In a proof-of-concept experiment where antigen molecules are immobilized on a biosensor tip, the C-terminal fusion of a pair of weakly homodimerizing proteins to three different antibodies enhanced the antigen-binding avidity by at least 110 or 304 folds from the intrinsic binding avidity. Compared with the mother antibody, Obinutuzumab(Y101L) which targets CD20, the same antibody with fused catenators exhibited significantly enhanced binding to SU-DHL5 cells. Together, the homodimerization-induced antibody catenation would be a new powerful approach to improve antibody applications, including the detection of scarce biomarkers and targeted anticancer therapies.
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Affiliation(s)
- Jinyeop Song
- Department of Physics, Korea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea
| | - Bo-Seong Jeong
- Department of Biological Sciences, KAIST Institute for the Biocentury, Korea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea
| | - Seong-Woo Kim
- Department of Biological Sciences, KAIST Institute for the Biocentury, Korea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea
| | - Seong-Bin Im
- Department of Biological Sciences, KAIST Institute for the Biocentury, Korea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea
| | - Seonghoon Kim
- Department of Biological Sciences, KAIST Institute for the Biocentury, Korea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea
| | - Chih-Jen Lai
- Cancer Biology Department, Infection Biology Program, and Global Center for Pathogen and Human Health Research, Lerner Research Institute, Cleveland ClinicClevelandUnited States
| | - Wonki Cho
- Department of Biological Sciences, KAIST Institute for the Biocentury, Korea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea
| | - Jae U Jung
- Cancer Biology Department, Infection Biology Program, and Global Center for Pathogen and Human Health Research, Lerner Research Institute, Cleveland ClinicClevelandUnited States
| | - Myung-Ju Ahn
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of MedicineSeoulRepublic of Korea
| | - Byung-Ha Oh
- Department of Biological Sciences, KAIST Institute for the Biocentury, Korea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea
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Chen J, Nguyen VP, Jaiswal S, Kang X, Lee M, Paulus YM, Wang TD. Thin Layer-Protected Gold Nanoparticles for Targeted Multimodal Imaging with Photoacoustic and CT. Pharmaceuticals (Basel) 2021; 14:ph14111075. [PMID: 34832857 PMCID: PMC8624483 DOI: 10.3390/ph14111075] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 10/13/2021] [Accepted: 10/20/2021] [Indexed: 01/19/2023] Open
Abstract
The large size of nanoparticles prevents rapid extravasation from blood vessels and diffusion into tumors. Multimodal imaging uses the physical properties of one modality to validate the results of another. We aim to demonstrate the use of a targeted thin layer-protected ultra-small gold nanoparticles (Au-NPs) to detect cancer in vivo using multimodal imaging with photoacoustic and computed tomography (CT). The thin layer was produced using a mixed thiol-containing short ligands, including MUA, CVVVT-ol, and HS-(CH2)11-PEG4-OH. The gold nanoparticle was labeled with a heterobivalent (HB) peptide ligand that targets overexpression of epidermal growth factor receptors (EGFR) and ErbB2, hereafter HB-Au-NPs. A human xenograft model of esophageal cancer was used for imaging. HB-Au-NPs show spherical morphology, a core diameter of 4.47 ± 0.8 nm on transmission electron microscopy, and a hydrodynamic diameter of 6.41 ± 0.73 nm on dynamic light scattering. Uptake of HB-Au-NPs was observed only in cancer cells that overexpressed EGFR and ErbB2 using photoacoustic microscopy. Photoacoustic images of tumors in vivo showed peak HB-Au-NPs uptake at 8 h post-injection with systemic clearance by ~48 h. Whole-body images using CT validated specific tumor uptake of HB-Au-NPs in vivo. HB-Au-NPs showed good stability and biocompatibility with fast clearance and contrast-enhancing capability for both photoacoustic and CT imaging. A targeted thin layer-protected gold nanoprobe represents a new platform for molecular imaging and shows promise for early detection and staging of cancer.
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Affiliation(s)
- Jing Chen
- Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, USA; (J.C.); (S.J.); (X.K.); (M.L.)
| | - Van Phuc Nguyen
- Kellogg Eye Center, Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI 48109, USA; (V.P.N.); (Y.M.P.)
| | - Sangeeta Jaiswal
- Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, USA; (J.C.); (S.J.); (X.K.); (M.L.)
| | - Xiaoyu Kang
- Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, USA; (J.C.); (S.J.); (X.K.); (M.L.)
| | - Miki Lee
- Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, USA; (J.C.); (S.J.); (X.K.); (M.L.)
| | - Yannis M. Paulus
- Kellogg Eye Center, Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI 48109, USA; (V.P.N.); (Y.M.P.)
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Thomas D. Wang
- Division of Gastroenterology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, USA; (J.C.); (S.J.); (X.K.); (M.L.)
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
- Correspondence:
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Zlotos DP, Abdelmalek CM, Botros LS, Banoub MM, Mandour YM, Breitinger U, El Nady A, Breitinger HG, Sotriffer C, Villmann C, Jensen AA, Holzgrabe U. C-2-Linked Dimeric Strychnine Analogues as Bivalent Ligands Targeting Glycine Receptors. JOURNAL OF NATURAL PRODUCTS 2021; 84:382-394. [PMID: 33596384 DOI: 10.1021/acs.jnatprod.0c01030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Strychnine is the prototypic antagonist of glycine receptors, a family of pentameric ligand-gated ion channels. Recent high-resolution structures of homomeric glycine receptors have confirmed the presence of five orthosteric binding sites located in the extracellular subunit interfaces of the receptor complex that are targeted by strychnine. Here, we report the synthesis and extensive pharmacological evaluation of bivalent ligands composed of two strychnine pharmacophores connected by appropriate spacers optimized toward simultaneous binding to two adjacent orthosteric sites of homomeric α1 glycine receptors. In all bivalent ligands, the two strychnine units were linked through C-2 by amide spacers of various lengths ranging from 6 to 69 atoms. Characterization of the compounds in two functional assays and in a radioligand binding assay indicated that compound 11a, with a spacer consisting of 57 atoms, may be capable of bridging the homomeric α1 GlyRs by simultaneous occupation of two adjacent strychnine-binding sites. The findings are supported by docking experiments to the crystal structure of the homomeric glycine receptor. Based on its unique binding mode, its relatively high binding affinity and antagonist potency, and its slow binding kinetics, the bivalent strychnine analogue 11a could be a valuable tool to study the functional properties of glycine receptors.
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Affiliation(s)
- Darius P Zlotos
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt
| | - Carine M Abdelmalek
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt
| | - Liza S Botros
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt
| | - Maha M Banoub
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt
| | - Yasmine M Mandour
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt
- School of Life and Medical Sciences, University of Hertfordshire hosted by Global Academic Foundation, New Administrative Capitol, 11865 Cairo, Egypt
| | - Ulrike Breitinger
- Department of Biochemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt
| | - Ahmed El Nady
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt
| | - Hans-Georg Breitinger
- Department of Biochemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt
| | - Christoph Sotriffer
- Institute of Pharmacy and Food Chemistry, University of Würzburg, 97074 Würzburg, Germany
| | - Carmen Villmann
- Institute of Clinical Neurobiology, University Hospital, University of Würzburg, 97078 Würzburg, Germany
| | - Anders A Jensen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Ulrike Holzgrabe
- Institute of Pharmacy and Food Chemistry, University of Würzburg, 97074 Würzburg, Germany
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Ziegler K, Kunert AT, Reinmuth-Selzle K, Leifke AL, Widera D, Weller MG, Schuppan D, Fröhlich-Nowoisky J, Lucas K, Pöschl U. Chemical modification of pro-inflammatory proteins by peroxynitrite increases activation of TLR4 and NF-κB: Implications for the health effects of air pollution and oxidative stress. Redox Biol 2020; 37:101581. [PMID: 32739154 PMCID: PMC7767743 DOI: 10.1016/j.redox.2020.101581] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 05/10/2020] [Accepted: 05/11/2020] [Indexed: 01/05/2023] Open
Abstract
Environmental pollutants like fine particulate matter can cause adverse health effects through oxidative stress and inflammation. Reactive oxygen and nitrogen species (ROS/RNS) such as peroxynitrite can chemically modify proteins, but the effects of such modifications on the immune system and human health are not well understood. In the course of inflammatory processes, the Toll-like receptor 4 (TLR4) can sense damage-associated molecular patterns (DAMPs). Here, we investigate how the TLR4 response and pro-inflammatory potential of the proteinous DAMPs α-Synuclein (α-Syn), heat shock protein 60 (HSP60), and high-mobility-group box 1 protein (HMGB1), which are relevant in neurodegenerative and cardiovascular diseases, changes upon chemical modification with peroxynitrite. For the peroxynitrite-modified proteins, we found a strongly enhanced activation of TLR4 and the pro-inflammatory transcription factor NF-κB in stable reporter cell lines as well as increased mRNA expression and secretion of the pro-inflammatory cytokines TNF-α, IL-1β, and IL-8 in human monocytes (THP-1). This enhanced activation of innate immunity via TLR4 is mediated by covalent chemical modifications of the studied DAMPs. Our results show that proteinous DAMPs modified by peroxynitrite more potently amplify inflammation via TLR4 activation than the native DAMPs, and provide first evidence that such modifications can directly enhance innate immune responses via a defined receptor. These findings suggest that environmental pollutants and related ROS/RNS may play a role in promoting acute and chronic inflammatory disorders by structurally modifying the body's own DAMPs. This may have important consequences for chronic neurodegenerative, cardiovascular or gastrointestinal diseases that are prevalent in modern societies, and calls for action, to improve air quality and climate in the Anthropocene. Pollutants and oxidative stress can cause protein nitration and oligomerization. Peroxynitrite amplifies inflammatory potential of disease-related proteins in vitro. Chemical modification of damage-associated molecular patterns (DAMPs). Positive feedback of modified DAMPs via pattern recognition receptor (TLR4). Air pollution may promote inflammatory disorders in the Anthropocene.
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Affiliation(s)
- Kira Ziegler
- Max Planck Institute for Chemistry, Multiphase Chemistry Department, 55128, Mainz, Germany
| | - Anna T Kunert
- Max Planck Institute for Chemistry, Multiphase Chemistry Department, 55128, Mainz, Germany
| | | | - Anna Lena Leifke
- Max Planck Institute for Chemistry, Multiphase Chemistry Department, 55128, Mainz, Germany
| | - Darius Widera
- Stem Cell Biology and Regenerative Medicine Group, School of Pharmacy, University of Reading, RG6 6AP, Reading, UK
| | - Michael G Weller
- Federal Institute for Materials Research and Testing (BAM), Berlin, Germany
| | - Detlef Schuppan
- Institute of Translational Immunology, University Medical Center of the Johannes Gutenberg University, 55131, Mainz, Germany; Division of Gastroenterology, Beth Israel Deaconess Medical Center, Harvard Medical School, MA, 02215, USA
| | | | - Kurt Lucas
- Max Planck Institute for Chemistry, Multiphase Chemistry Department, 55128, Mainz, Germany.
| | - Ulrich Pöschl
- Max Planck Institute for Chemistry, Multiphase Chemistry Department, 55128, Mainz, Germany.
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Pérez-Benito L, Henry A, Matsoukas MT, Lopez L, Pulido D, Royo M, Cordomí A, Tresadern G, Pardo L. The size matters? A computational tool to design bivalent ligands. Bioinformatics 2019; 34:3857-3863. [PMID: 29850769 PMCID: PMC6223368 DOI: 10.1093/bioinformatics/bty422] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 05/23/2018] [Indexed: 12/15/2022] Open
Abstract
Motivation Bivalent ligands are increasingly important such as for targeting G protein-coupled receptor (GPCR) dimers or proteolysis targeting chimeras (PROTACs). They contain two pharmacophoric units that simultaneously bind in their corresponding binding sites, connected with a spacer chain. Here, we report a molecular modelling tool that links the pharmacophore units via the shortest pathway along the receptors van der Waals surface and then scores the solutions providing prioritization for the design of new bivalent ligands. Results Bivalent ligands of known dimers of GPCRs, PROTACs and a model bivalent antibody/antigen system were analysed. The tool could rapidly assess the preferred linker length for the different systems and recapitulated the best reported results. In the case of GPCR dimers the results suggest that in some cases these ligands might bind to a secondary binding site at the extracellular entrance (vestibule or allosteric site) instead of the orthosteric binding site. Availability and implementation Freely accessible from the Molecular Operating Environment svl exchange server (https://svl.chemcomp.com/). Supplementary information Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Laura Pérez-Benito
- Laboratori de Medicina Computacional, Unitat de Bioestadística, Facultat de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Andrew Henry
- Chemical Computing Group, St John's Innovation Centre Cowley Road, Cambridge, UK
| | - Minos-Timotheos Matsoukas
- Department of Pharmacy, University Campus, University of Patras, School of Health Sciences, Rion, Patras, Greece
| | - Laura Lopez
- Laboratori de Medicina Computacional, Unitat de Bioestadística, Facultat de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Daniel Pulido
- Combinatorial Chemistry Unit, Barcelona Science Park, Barcelona, Spain.,Centro de Investigación Biomédica en Red-Bioingeniería Biomateriales y Nanomedicina (CIBER-BBN), Spain
| | - Miriam Royo
- Combinatorial Chemistry Unit, Barcelona Science Park, Barcelona, Spain.,Centro de Investigación Biomédica en Red-Bioingeniería Biomateriales y Nanomedicina (CIBER-BBN), Spain
| | - Arnau Cordomí
- Laboratori de Medicina Computacional, Unitat de Bioestadística, Facultat de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | | | - Leonardo Pardo
- Laboratori de Medicina Computacional, Unitat de Bioestadística, Facultat de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Spain
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