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Ahn JH, Johnny CL, Chenoweth DM. Duo-Chol: A Photoconvertible Live Cell Imaging Tool for Tracking Cholesterol. Bioconjug Chem 2024; 35:890-896. [PMID: 38913976 DOI: 10.1021/acs.bioconjchem.4c00207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/26/2024]
Abstract
Investigating cholesterol trafficking pathways continues to be of significant scientific interest owing to its homeostasis being associated with several debilitating cardiovascular and neurodegenerative diseases including atherosclerosis, Niemann-Pick's disease, Alzheimer's disease, and Parkinson's disease. To further our understanding of cholesterol trafficking, it is imperative to develop new fluorescent probes that possess improved photostability, low efflux, and high spatial and temporal resolution for live-cell imaging. In this study, we developed a photoconvertible fluorescent cholesterol analog, Duo-Chol, enabling the improved spatiotemporal fluorescence imaging of the dynamic localization of cholesterol in live cells. This tool provides a unique and powerful approach to interrogating cholesterol dynamics, addressing the limitations of existing methods, and expanding our ability to probe the biological role of sterols in living cells.
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Affiliation(s)
- June H Ahn
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Christopher L Johnny
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - David M Chenoweth
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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2
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Pradhan RN, Irrera P, Romdhane F, Panda SK, Longo DL, Torres J, Kremer C, Assaiya A, Kumar J, Singh AK. Di-Pyridine-Containing Macrocyclic Triamide Fe(II) and Ni(II) Complexes as ParaCEST Agents. Inorg Chem 2022; 61:16650-16663. [PMID: 36205705 DOI: 10.1021/acs.inorgchem.2c02242] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fe(II) and Ni(II) paraCEST contrast agents containing the di-pyridine macrocyclic ligand 2,2',2″-(3,7,10-triaza-1,5(2,6)-dipyridinacycloundecaphane-3,7,10-triyl)triacetamide (DETA) are reported here. Both [Fe(DETA)]2+ and [Ni(DETA)]2+ complexes were structurally characterized. Crystallographic data revealed the seven-coordinated distorted pentagonal bipyramidal geometry of the [Fe(DETA)]·(BF4)2·MeCN complex with five coordinated nitrogen atoms from the macrocyclic ring and two coordinated oxygen atoms from two amide pendant arms. The [Ni(DETA)]·Cl2·2H2O complex was six-coordinated in nature with a distorted octahedral geometry. Four coordinated nitrogen atoms were from the macrocyclic ring, and two coordinated oxygen atoms were from two amide pendant arms. [Fe(DETA)]2+ exhibited well-resolved sharp proton resonances, whereas very broad proton resonances were observed in the case of [Ni(DETA)]2+ due to the long electronic relaxation times. The CEST peaks for the [Fe(DETA)]2+ complex showed one highly downfield-shifted and intense peak at 84 ppm with another shifted but less intense peak at 28 ppm with good CEST contrast efficiency at body temperature, whereas [Ni(DETA)]2+ showed only one highly shifted intense peak at 78 ppm from the bulk water protons. Potentiometric titrations were performed to determine the protonation constants of the ligand and the thermodynamic stability constant of the [M(DETA)]2+ (M = Fe, Co, Ni, Cu, Zn) species at 25.0 °C and I = 0.15 mol·L-1 NaClO4. Metal exchange studies confirmed the stability of the complexes in acidic medium in the presence of physiologically relevant anions and an equimolar concentration of Zn(II) ions.
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Affiliation(s)
- Rabindra N Pradhan
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar752050, India
| | - Pietro Irrera
- University of Campania "Luigi Vanvitelli", Caserta81100, Italy
| | - Feriel Romdhane
- Institute of Biostructures and Bioimaging (IBB), National Research Council of Italy (CNR), Torino10126, Italy
| | - Suvam Kumar Panda
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar752050, India
| | - Dario Livio Longo
- Institute of Biostructures and Bioimaging (IBB), National Research Council of Italy (CNR), Torino10126, Italy
| | - Julia Torres
- Área Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, Montevideo11800, Uruguay
| | - Carlos Kremer
- Área Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, Montevideo11800, Uruguay
| | - Anshul Assaiya
- National Centre for Cell Science, NCCS Complex, Pune University Campus, Ganeshkhind, Pune411 007, India
| | - Janesh Kumar
- National Centre for Cell Science, NCCS Complex, Pune University Campus, Ganeshkhind, Pune411 007, India
| | - Akhilesh K Singh
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar752050, India
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3
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Carrasco E, Gomez-Gutierrez P, Campos PM, Vega M, Messeguer A, Perez JJ. Discovery of novel 2,3,5-trisubstituted pyridine analogs as potent inhibitors of IL-1β via modulation of the p38 MAPK signaling pathway. Eur J Med Chem 2021; 223:113620. [PMID: 34186234 DOI: 10.1016/j.ejmech.2021.113620] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 04/08/2021] [Accepted: 06/01/2021] [Indexed: 12/20/2022]
Abstract
Interleukin-1β is a central mediator of innate immune responses and inflammation. It plays a key role in a wide variety of pathologies, ranging from autoinflammatory diseases to metabolic syndrome and malignant tumors. It is well established that its inhibition results in a rapid and sustained reduction in disease severity, underlining the importance of having a repertoire of drugs of this class. At present, there are only three interleukin-1β blockers approved in the clinic. All of them are biologics, requiring parenteral administration and resulting in expensive treatments. In an exercise to identify small molecule allosteric inhibitors of MAP kinases, we discovered a series of compounds that block IL-1β release produced as a consequence of a stimulus involved in triggering an inflammatory response. The present study reports the hit-to-lead optimization process that permitted the identification of the compound 13b (AIK3-305) an orally available, potent and selective inhibitor of IL-1β. Furthermore, the study also reports the results of an in vivo efficacy study of 13b in a LPS endotoxic shock model in male BALB/c mice, where IL-1β inhibition is monitored in different tissues.
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Affiliation(s)
- Esther Carrasco
- Allinky Biopharma, Campus de Cantoblanco, Faraday 7, 28049, Madrid, Spain
| | - Patricia Gomez-Gutierrez
- Allinky Biopharma, Campus de Cantoblanco, Faraday 7, 28049, Madrid, Spain; Dept. of Chemical Engineering, Universitat Politecnica de Catalunya, 08028, Barcelona, Spain
| | - Pedro M Campos
- Allinky Biopharma, Campus de Cantoblanco, Faraday 7, 28049, Madrid, Spain
| | - Miguel Vega
- Allinky Biopharma, Campus de Cantoblanco, Faraday 7, 28049, Madrid, Spain
| | - Angel Messeguer
- IQAC CSIC, Institute of Advanced Chemistry of Catalonia, Dept. Biological Chemistry, Jordi Girona 18-26, 08034, Barcelona, Spain
| | - Juan J Perez
- Dept. of Chemical Engineering, Universitat Politecnica de Catalunya, 08028, Barcelona, Spain.
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Pradhan RN, Chakraborty S, Bharti P, Kumar J, Ghosh A, Singh AK. Seven coordinate Co(ii) and six coordinate Ni(ii) complexes of an aromatic macrocyclic triamide ligand as paraCEST agents for MRI. Dalton Trans 2019; 48:8899-8910. [PMID: 31140528 DOI: 10.1039/c9dt00747d] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
We are reporting Co(ii) and Ni(ii) complexes of a pyridine containing aromatic macrocyclic triamide ligand, 3,6,9,15-tetraazabicyclo(9.3.1)pentadeca-1(15),11,13-triene-3,6,9-triacetamide (TPTA), as paramagnetic chemical exchange saturation transfer (paraCEST) MRI contrast agents. The synthesis and characterization of TPTA and its complexes are reported. The solution chemistry and solid-state structure of Co(ii) and Ni(ii) complexes are studied. Crystallographic data show that the [Co(TPTA)]·Cl2·2H2O complex (seven-coordinate, all four N atoms of ring and three amide O atoms) has a distorted pentagonal bipyramidal geometry, however the [Ni(TPTA)Cl]·Cl·0.25H2O complex (six-coordinate, all four N atoms of the ring, one amide O and one chloride ion) adopts a distorted octahedral geometry. Notably the two pendent amide arms are not coordinated in the [Ni(TPTA)Cl]+ complex and one chloride ion fulfils its sixth coordination. The CEST effect of [Co(TPTA)]2+ and [Ni(TPTA)Cl]+ amide protons is observed at 57 ppm and 78 ppm downfield of the bulk water proton respectively in a buffer solution containing 20 mM N-(2-hydroxyethyl)piperazine-N'-ethanesulfonic acid and 100 mM NaCl at pH 7.4 at 37 °C on a 9.4 T NMR spectrometer. The effects of CEST intensity and exchange rate constant with variation of pH of the solution were studied. The CEST effect and exchange rate constant for the amide protons of the [Co(TPTA)]2+ complex have been monitored in HEPES buffer, fetal bovine serum (FBS), rabbit serum and 4% agarose gel (w/w). The stability of the [Co(TPTA)]2+ complex in aqueous solution towards oxidation was verified by cyclic voltammetry measurement. The stability of [Co(TPTA)]2+ has further been monitored in the presence of biologically relevant ions including HPO42-, CO32-, and Zn2+ and under acidic conditions.
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Affiliation(s)
- Rabindra N Pradhan
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar, 752050, India.
| | - Subhayan Chakraborty
- School of Chemical Sciences, National Institute of Science Education and Research (HBNI) Bhubaneswar, 752050, India.
| | - Pratibha Bharti
- National Centre for Cell Science, NCCS Complex, Pune University Campus, Ganeshkhind, Pune 411 007, India
| | - Janesh Kumar
- National Centre for Cell Science, NCCS Complex, Pune University Campus, Ganeshkhind, Pune 411 007, India
| | - Arindam Ghosh
- School of Chemical Sciences, National Institute of Science Education and Research (HBNI) Bhubaneswar, 752050, India.
| | - Akhilesh K Singh
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar, 752050, India.
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Jun JV, Haney CM, Karpowicz RJ, Giannakoulias S, Lee VMY, Petersson EJ, Chenoweth DM. A "Clickable" Photoconvertible Small Fluorescent Molecule as a Minimalist Probe for Tracking Individual Biomolecule Complexes. J Am Chem Soc 2019; 141:1893-1897. [PMID: 30657670 DOI: 10.1021/jacs.8b13094] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Photoconvertible fluorophores can enable the visualization and tracking of a specific biomolecules, complexes, and cellular compartments with precise spatiotemporal control. The field of photoconvertible probes is dominated by fluorescent protein variants, which can introduce perturbations to the target biomolecules due to their large size. Here, we present a photoconvertible small molecule, termed CPX, that can be conjugated to any target through azide-alkyne cycloaddition ("click" reaction). To demonstrate its utility, we have applied CPX to study (1) trafficking of biologically relevant synthetic vesicles and (2) intracellular processes involved in transmission of α-synuclein (αS) pathology. Our results demonstrate that CPX can serve as a minimally perturbing probe for tracking the dynamics of biomolecules.
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Affiliation(s)
- Joomyung V Jun
- Department of Chemistry , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Conor M Haney
- Department of Chemistry , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Richard J Karpowicz
- Department of Pathology and Laboratory Medicine , Center for Neurodegenerative Disease Research, University of Pennsylvania , 3600 Spruce Street , Philadelphia , Pennsylvania 19104 , United States
| | - Sam Giannakoulias
- Department of Chemistry , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Virginia M-Y Lee
- Department of Pathology and Laboratory Medicine , Center for Neurodegenerative Disease Research, University of Pennsylvania , 3600 Spruce Street , Philadelphia , Pennsylvania 19104 , United States
| | - E James Petersson
- Department of Chemistry , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - David M Chenoweth
- Department of Chemistry , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
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7
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Mouradzadegun A, Mostafavi MA. Design and synthesis of a new porous organic polymer equipped with N-propyl sulfamic acid functionalities: As an efficient heterogeneous catalyst for the synthesis of 1,8-dioxo-octahydroxanthene derivatives. POLYM ENG SCI 2017. [DOI: 10.1002/pen.24722] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Arash Mouradzadegun
- Department of Chemistry, Faculty of Science; Shahid Chamran University of Ahvaz; Ahvaz Iran
- Center of Excellence in Electrochemistry, Faculty of Chemistry; University of Tehran; Tehran Iran
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Abstract
Arynes are important and versatile intermediates in a variety of transformations. Commonly used solvents for aryne chemistry include acetonitrile and dichloromethane. Although rarely reported, the reactive nature of aryne intermediates makes them prone to side reactions, which sometimes involve solvent participation. Acetonitrile and dichloromethane are not always innocent solvents and can participate in aryne-based reactions. These results are presented in the context of ongoing mechanistic investigations of the triple aryne-tetrazine reaction.
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Affiliation(s)
- Sung-Eun Suh
- Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
| | - David M Chenoweth
- Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
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Abstract
This review covers the literature published in 2013 for marine natural products (MNPs), with 982 citations (644 for the period January to December 2013) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1163 for 2013), together with the relevant biological activities, source organisms and country of origin. Reviews, biosynthetic studies, first syntheses, and syntheses that lead to the revision of structures or stereochemistries, have been included.
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Affiliation(s)
- John W Blunt
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand.
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10
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Tran MN, Rarig RAF, Chenoweth DM. Synthesis and properties of lysosome-specific photoactivatable probes for live-cell imaging. Chem Sci 2015; 6:4508-4512. [PMID: 28496967 PMCID: PMC5299591 DOI: 10.1039/c5sc01601k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2015] [Accepted: 06/09/2015] [Indexed: 11/21/2022] Open
Abstract
We describe the synthesis and application of a new class of large Stokes shift lysosome-specific photoactivatable probes for live-cell imaging.
Fluorescent dyes have become increasingly important in cell biology since they enable high signal-to-noise and selectivity in visualizing subcellular organelles. Photoactivatable dyes allow for tracking and monitoring of a subset of cells or organelles. Here, we report the synthesis and application of a new class of large Stokes shift fluorescent dyes that are water-soluble, cell permeable, non-cytotoxic, and lysosome-specific. Additionally, we demonstrate temporally controlled sequential photoactivation of individual cells in close spatial proximity.
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Affiliation(s)
- Mai N Tran
- Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , PA 19104-6323 , USA .
| | - Robert-André F Rarig
- Department of Chemistry , Temple University , 130 Beury Hall, 1901 N. 13th Street , Philadelphia PA 19122 , USA
| | - David M Chenoweth
- Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , PA 19104-6323 , USA .
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11
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Barros SA, Chenoweth DM. Triptycene-based small molecules modulate (CAG)·(CTG) repeat junctions. Chem Sci 2015; 6:4752-4755. [PMID: 26366282 PMCID: PMC4538686 DOI: 10.1039/c5sc01595b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2015] [Accepted: 05/27/2015] [Indexed: 01/19/2023] Open
Abstract
A triptycene-based scaffold is used to develop a new class of ligands for modulating the structure of junction forming trinucleotide repeat expansion sequences.
Nucleic acid three-way junctions (3WJs) play key roles in biological processes such as nucleic acid replication in addition to being implicated as dynamic transient intermediates in trinucleotide repeat sequences. Structural modulation of specific nucleic acid junctions could allow for control of biological processes and disease states at the nucleic acid level. Trinucleotide repeat expansions are associated with several neurodegenerative diseases where dynamic slippage is thought to occur during replication, forming transient 3WJ intermediates with the complementary strand. Here, we report triptycene-based molecules that bind to a d(CAG)·(CTG) repeat using a gel shift assay, fluorescence-quenching and circular dichroism.
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Affiliation(s)
- Stephanie A Barros
- Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , PA 19104-6323 , USA .
| | - David M Chenoweth
- Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , PA 19104-6323 , USA .
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12
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Photoelectrocyclization as an Activation Mechanism for Organelle-Specific Live-Cell Imaging Probes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502403] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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13
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Tran MN, Chenoweth DM. Photoelectrocyclization as an activation mechanism for organelle-specific live-cell imaging probes. Angew Chem Int Ed Engl 2015; 54:6442-6. [PMID: 25950154 DOI: 10.1002/anie.201502403] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Indexed: 12/12/2022]
Abstract
Photoactivatable fluorophores are useful tools in live-cell imaging owing to their potential for precise spatial and temporal control. In this report, a new photoactivatable organelle-specific live-cell imaging probe based on a 6π electrocyclization/oxidation mechanism is described. It is shown that this new probe is water-soluble, non-cytotoxic, cell-permeable, and useful for mitochondrial imaging. The probe displays large Stokes shifts in both pre-activated and activated forms, allowing simultaneous use with common dyes and fluorescent proteins. Sequential single-cell activation experiments in dense cellular environments demonstrate high spatial precision and utility in single- or multi-cell labeling experiments.
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Affiliation(s)
- Mai N Tran
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104 (USA)
| | - David M Chenoweth
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104 (USA).
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Suh SE, Barros SA, Chenoweth DM. Triple Aryne-Tetrazine Reaction Enabling Rapid Access to a New Class of Polyaromatic Heterocycles. Chem Sci 2015; 6:5128-5132. [PMID: 26388984 PMCID: PMC4570739 DOI: 10.1039/c5sc01726b] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
We report the triple aryne–tetrazine reaction for rapid access to a new class of dibenzocinnoline heteroaromatics.
One of the most challenging goals of modern synthetic chemistry is to develop multi-step reactions for rapid and efficient access to complex molecules. We report a triple aryne–tetrazine reaction that enables rapid access to a new class of polyaromatic heterocycles. This new reaction, which couples diverse reactivity modes between simple aryne and tetrazine starting materials, proceeds in a single operation and takes less than 5 minutes in air with no metal catalyst.
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Affiliation(s)
- Sung-Eun Suh
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104 (USA)
| | - Stephanie A Barros
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104 (USA)
| | - David M Chenoweth
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104 (USA)
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Barros SA, Chenoweth DM. Recognition of nucleic acid junctions using triptycene-based molecules. Angew Chem Int Ed Engl 2014; 53:13746-50. [PMID: 25257803 DOI: 10.1002/anie.201407061] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 10/09/2014] [Indexed: 12/24/2022]
Abstract
The modulation of nucleic acids by small molecules is an essential process across the kingdoms of life. Targeting nucleic acids with small molecules represents a significant challenge at the forefront of chemical biology. Nucleic acid junctions are ubiquitous structural motifs in nature and in designed materials. Herein, we describe a new class of structure-specific nucleic acid junction stabilizers based on a triptycene scaffold. Triptycenes provide significant stabilization of DNA and RNA three-way junctions, providing a new scaffold for the development of nucleic acid junction binders with enhanced recognition properties. Additionally, we report cytotoxicity and cell uptake data in two human ovarian carcinoma cell lines.
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Affiliation(s)
- Stephanie A Barros
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104 (USA)
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Barros SA, Chenoweth DM. Recognition of Nucleic Acid Junctions Using Triptycene-Based Molecules. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201407061] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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