1
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Josa-Culleré L, Aira Rodríguez C, Llebaria A. Hemithioindigo-based histone deacetylase inhibitors induce a light-dependent anticancer effect. Eur J Med Chem 2024; 279:116846. [PMID: 39270453 DOI: 10.1016/j.ejmech.2024.116846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 08/14/2024] [Accepted: 08/23/2024] [Indexed: 09/15/2024]
Abstract
Photoswitchable molecules exhibit light-dependent biological activity which allow us to control the therapeutic effect of drugs with high precision. Such molecules could solve some of the limitations of anticancer drugs by providing a localised effect in the tumour. Histone deacetylase inhibitors (HDACis) constitute a promising drug class for oncology whose application is often limited by a lack of selectivity. Herein, we developed photoswitchable HDACis based on a hemithioindigo scaffold. We established synthetic routes to access them and determined the optimal conditions for isomerisation and their thermal stability. We then optimised their enzyme activity through three rounds of re-design to identify examples that are up to 6-fold more active under illumination than in the dark. We also confirmed that our best derivative reduces the viability of HeLa cells only under illumination. All in all, we disclose a series of derivatives containing a hemithioindigo moiety, which display a light-dependent effect on both HDAC inhibition and cancer cell viability.
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Affiliation(s)
- Laia Josa-Culleré
- MCS, Laboratory of Medicinal Chemistry & Synthesis, Department of Biological Chemistry, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), Jordi Girona 18-26, 08034, Barcelona, Spain.
| | - Carla Aira Rodríguez
- MCS, Laboratory of Medicinal Chemistry & Synthesis, Department of Biological Chemistry, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), Jordi Girona 18-26, 08034, Barcelona, Spain
| | - Amadeu Llebaria
- MCS, Laboratory of Medicinal Chemistry & Synthesis, Department of Biological Chemistry, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), Jordi Girona 18-26, 08034, Barcelona, Spain.
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2
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La Monica G, Alamia F, Bono A, Lauria A, Martorana A. Scaffold-Hopping Strategies in Aurone Optimization: A Comprehensive Review of Synthetic Procedures and Biological Activities of Nitrogen and Sulfur Analogues. Molecules 2024; 29:2813. [PMID: 38930878 PMCID: PMC11206683 DOI: 10.3390/molecules29122813] [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: 05/17/2024] [Revised: 06/04/2024] [Accepted: 06/10/2024] [Indexed: 06/28/2024] Open
Abstract
Aurones, particular polyphenolic compounds belonging to the class of minor flavonoids and overlooked for a long time, have gained significative attention in medicinal chemistry in recent years. Indeed, considering their unique and outstanding biological properties, they stand out as an intriguing reservoir of new potential lead compounds in the drug discovery context. Nevertheless, several physicochemical, pharmacokinetic, and pharmacodynamic (P3) issues hinder their progression in more advanced phases of the drug discovery pipeline, making lead optimization campaigns necessary. In this context, scaffold hopping has proven to be a valuable approach in the optimization of natural products. This review provides a comprehensive and updated picture of the scaffold-hopping approaches directed at the optimization of natural and synthetic aurones. In the literature analysis, a particular focus is given to nitrogen and sulfur analogues. For each class presented, general synthetic procedures are summarized, highlighting the key advantages and potential issues. Furthermore, the biological activities of the most representative scaffold-hopped compounds are presented, emphasizing the improvements achieved and the potential for further optimization compared to the aurone class.
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Affiliation(s)
| | | | | | | | - Annamaria Martorana
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Viale delle Scienze, Ed. 17, I-90128 Palermo, Italy; (G.L.M.); (F.A.); (A.B.); (A.L.)
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3
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Köttner L, Wolff F, Mayer P, Zanin E, Dube H. Rhodanine-Based Chromophores: Fast Access to Capable Photoswitches and Application in Light-Induced Apoptosis. J Am Chem Soc 2024; 146:1894-1903. [PMID: 38207286 DOI: 10.1021/jacs.3c07710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
Molecular photoswitches are highly desirable in all chemistry-related areas of research. They provide effective outside control over geometric and electronic changes at the nanoscale using an easy to apply, waste-free stimulus. However, simple and effective access to such molecular tools is typically not granted, and elaborate syntheses and substitution schemes are needed in order to obtain efficient photoswitching properties. Here we present a series of rhodanine-based photoswitches that can be prepared in one simple synthetic step without requiring elaborate purification. Photoswitching is induced by UV and visible light in both switching directions, and thermal stabilities of the metastable states as well as quantum yields are very high. An additional benefit is the hydrogen-bonding capacity of the rhodanine fragment, which enables applications in supramolecular or medicinal chemistry. We further show that the known rhodanine-based inhibitor SMI-16a is a photoswitchable apoptosis inducer. The biological activity of SMI-16a can effectively be switched ON or OFF by reversible photoisomerization between the inactive E and the active Z isomer. Rhodanine-based photoswitches therefore represent an easy to access and highly valuable molecular toolbox for implementing light responsiveness to the breadth of functional molecular systems.
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Affiliation(s)
- Laura Köttner
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Straße 10, 91058 Erlangen, Germany
| | - Friederike Wolff
- Department of Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 5, 91058 Erlangen, Germany
| | - Peter Mayer
- Department of Chemistry and Munich Center for Integrated Protein Science CIPSM, Ludwig-Maximilians-Universität München, D-81377 Munich, Germany
| | - Esther Zanin
- Department of Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 5, 91058 Erlangen, Germany
| | - Henry Dube
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Straße 10, 91058 Erlangen, Germany
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4
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Zhang Z, Le GNT, Ge Y, Tang X, Chen X, Ejim L, Bordeleau E, Wright GD, Burns DC, Tran S, Axerio-Cilies P, Wang YT, Dong M, Woolley GA. Isomerization of bioactive acylhydrazones triggered by light or thiols. Nat Chem 2023; 15:1285-1295. [PMID: 37308709 DOI: 10.1038/s41557-023-01239-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 05/12/2023] [Indexed: 06/14/2023]
Abstract
The acylhydrazone unit is well represented in screening databases used to find ligands for biological targets, and numerous bioactive acylhydrazones have been reported. However, potential E/Z isomerization of the C=N bond in these compounds is rarely examined when bioactivity is assayed. Here we analysed two ortho-hydroxylated acylhydrazones discovered in a virtual drug screen for modulators of N-methyl-D-aspartate receptors and other bioactive hydroxylated acylhydrazones with structurally defined targets reported in the Protein Data Bank. We found that ionized forms of these compounds, which are populated under laboratory conditions, photoisomerize readily and the isomeric forms have markedly different bioactivity. Furthermore, we show that glutathione, a tripeptide involved with cellular redox balance, catalyses dynamic E⇄Z isomerization of acylhydrazones. The ratio of E to Z isomers in cells is determined by the relative stabilities of the isomers regardless of which isomer was applied. We conclude that E/Z isomerization may be a common feature of the bioactivity observed with acylhydrazones and should be routinely analysed.
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Affiliation(s)
- Zhiwei Zhang
- Department of Chemistry, University of Toronto, Toronto, Ontario, Canada
- Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, China
| | - Giang N T Le
- Department of Chemistry, University of Toronto, Toronto, Ontario, Canada
| | - Yang Ge
- Department of Medicine, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, British Columbia, Canada
| | - Xiaowen Tang
- Department of Medicinal Chemistry, School of Pharmacy, Qingdao University, Qingdao, China
| | - Xin Chen
- Department of Medicinal Chemistry, School of Pharmacy, Qingdao University, Qingdao, China
| | - Linda Ejim
- David Braley Centre for Antibiotics Discovery M.G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Emily Bordeleau
- David Braley Centre for Antibiotics Discovery M.G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Gerard D Wright
- David Braley Centre for Antibiotics Discovery M.G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Darcy C Burns
- Department of Chemistry, University of Toronto, Toronto, Ontario, Canada
| | - Susannah Tran
- Department of Chemistry, University of Toronto, Toronto, Ontario, Canada
| | - Peter Axerio-Cilies
- Department of Medicine, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, British Columbia, Canada.
| | - Yu Tian Wang
- Department of Medicine, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, British Columbia, Canada.
| | - Mingxin Dong
- Department of Medicinal Chemistry, School of Pharmacy, Qingdao University, Qingdao, China.
| | - G Andrew Woolley
- Department of Chemistry, University of Toronto, Toronto, Ontario, Canada.
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5
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Gernet A, El Rhaz A, Jean L. Easily Accessible Substituted Heterocyclic Hemithioindigos as Bistable Molecular Photoswitches. Chemistry 2023; 29:e202301160. [PMID: 37357141 DOI: 10.1002/chem.202301160] [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: 04/12/2023] [Revised: 06/11/2023] [Accepted: 06/12/2023] [Indexed: 06/27/2023]
Abstract
Thioaurone chromophores, part of the indigoid family and commonly named hemithioindigos, have recently gained attention due to their interesting photoswitching properties. The study focuses on heterocyclic hemithioindigos (Het-HTIs) and investigates their synthesis using electron-rich and electron-poor heterocycles and modifications to the thioindigo moiety. Furthermore, it aims to evaluate the photoswitching performances of these synthesised compounds, with a particular emphasis on the influence of the heterocycles on the photoisomerization capabilities, which was found to be more prominent than the modifications made to the thioindigo moiety. Among the 44 Het-HTIs tested, several exhibited highly efficient photoswitchable properties, demonstrating Z-to-E photoisomerization in the blue region, and E-to-Z photoisomerization in the green or the red regions. Additionally, the metastable E-isomer displayed an impressive half-life of up to 54 days in a polar solvent (DMSO). These results suggest that heterocyclic hemithioindigos hold great promise as photoswitches for researchers interested in light-controlled molecular mechanisms.
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Affiliation(s)
- Aurélie Gernet
- Université Paris Cité, CNRS, Inserm, CiTCoM, 75006, Paris, France
| | - Ahmed El Rhaz
- Université Paris Cité, CNRS, Inserm, CiTCoM, 75006, Paris, France
| | - Ludovic Jean
- Université Paris Cité, CNRS, Inserm, CiTCoM, 75006, Paris, France
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6
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Borys F, Tobiasz P, Fabczak H, Joachimiak E, Krawczyk H. First-in-Class Colchicine-Based Visible Light Photoswitchable Microtubule Dynamics Disrupting Agent. Cells 2023; 12:1866. [PMID: 37508530 PMCID: PMC10378023 DOI: 10.3390/cells12141866] [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: 05/23/2023] [Revised: 07/10/2023] [Accepted: 07/11/2023] [Indexed: 07/30/2023] Open
Abstract
Compounds that disrupt microtubule dynamics, such as colchicine, paclitaxel, or Vinca alkaloids, have been broadly used in biological studies and have found application in clinical anticancer medications. However, their main disadvantage is the lack of specificity towards cancerous cells, leading to severe side effects. In this paper, we report the first synthesis of 12 new visible light photoswitchable colchicine-based microtubule inhibitors AzoCols. Among the obtained compounds, two photoswitches showed light-dependent cytotoxicity in cancerous cell lines (HCT116 and MCF-7). The most promising compound displayed a nearly twofold increase in potency. Moreover, dissimilar inhibition of purified tubulin polymerisation in cell-free assay and light-dependent disruption of microtubule organisation visualised by immunofluorescence imaging sheds light on the mechanism of action as microtubule photoswitchable destabilisers. The presented results provide a foundation towards the synthesis and development of a novel class of photoswitchable colchicine-based microtubule polymerisation inhibitors.
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Affiliation(s)
- Filip Borys
- Department of Organic Chemistry, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3 Street, 00-664 Warsaw, Poland
- Laboratory of Cytoskeleton and Cilia Biology, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093 Warsaw, Poland
| | - Piotr Tobiasz
- Department of Organic Chemistry, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3 Street, 00-664 Warsaw, Poland
| | - Hanna Fabczak
- Laboratory of Cytoskeleton and Cilia Biology, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093 Warsaw, Poland
| | - Ewa Joachimiak
- Laboratory of Cytoskeleton and Cilia Biology, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093 Warsaw, Poland
| | - Hanna Krawczyk
- Department of Organic Chemistry, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3 Street, 00-664 Warsaw, Poland
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7
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Josef V, Hampel F, Dube H. Heterocyclic Hemithioindigos: Highly Advantageous Properties as Molecular Photoswitches. Angew Chem Int Ed Engl 2022; 61:e202210855. [PMID: 36040861 PMCID: PMC9826360 DOI: 10.1002/anie.202210855] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Indexed: 01/11/2023]
Abstract
A survey of heterocyclic hemithioindigo photoswitches is presented identifying a number of structural motives with outstanding property profiles. The highly sought-after combination of pronounced color change, quantitative switching in both directions, exceptional high quantum yields, and tunable high thermal stability of metastable states can be realized with 4-imidazole, 2-pyrrole, and 3-indole-based derivatives. In the former, an unusual preorganization using isomer selective chalcogen- and hydrogen bonding allows to precisely control geometry changes and tautomerism upon switching. Heterocyclic hemithioindigos thus represent highly promising photoswitches with advanced capabilities that will be of great value to anyone interested in establishing defined and reversible control at the molecular level.
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Affiliation(s)
- Verena Josef
- Friedrich-Alexander Universität Erlangen-NürnbergDepartment of Chemistry and PharmacyNikolaus-Fiebiger-Str. 1091058ErlangenGermany
| | - Frank Hampel
- Friedrich-Alexander Universität Erlangen-NürnbergDepartment of Chemistry and PharmacyNikolaus-Fiebiger-Str. 1091058ErlangenGermany
| | - Henry Dube
- Friedrich-Alexander Universität Erlangen-NürnbergDepartment of Chemistry and PharmacyNikolaus-Fiebiger-Str. 1091058ErlangenGermany
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8
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Lazinski LM, Royal G, Robin M, Maresca M, Haudecoeur R. Bioactive Aurones, Indanones, and Other Hemiindigoid Scaffolds: Medicinal Chemistry and Photopharmacology Perspectives. J Med Chem 2022; 65:12594-12625. [PMID: 36126323 DOI: 10.1021/acs.jmedchem.2c01150] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hemiindigoids comprise a range of natural and synthetic scaffolds that share the same aromatic hydrocarbon backbone as well as promising biological and optical properties. The encouraging therapeutic potential of these scaffolds has been unraveled by many studies over the past years and uncovered representants with inspiring pharmacophoric features such as the acetylcholinesterase inhibitor donezepil and the tubulin polymerization inhibitor indanocine. In this review, we summarize the last advances in the medicinal potential of hemiindigoids, with a special attention to molecular design, structure-activity relationship, ligand-target interactions, and mechanistic explanations covering their effects. As their strong fluorogenic potential and photoswitch behavior recently started to be highlighted and explored in biology, giving rise to the development of novel fluorescent probes and photopharmacological agents, we also discuss these properties in a medicinal chemistry perspective.
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Affiliation(s)
- Leticia M Lazinski
- Université Grenoble Alpes, CNRS 5063, DPM, 38000 Grenoble, France.,Université Grenoble Alpes, CNRS 5250, DCM, 38000 Grenoble, France
| | - Guy Royal
- Université Grenoble Alpes, CNRS 5250, DCM, 38000 Grenoble, France
| | - Maxime Robin
- Mediterranean Institute of Marine and Terrestrial Biodiversity and Ecology (IMBE), Aix Marseille Université, 27 Boulevard Jean Moulin, 13385 Marseille, France
| | - Marc Maresca
- Aix Marseille Université, CNRS, Centrale Marseille, iSm2, 13397 Marseille, France
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9
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Synthesis and Study of Dibenzo[b, f]oxepine Combined with Fluoroazobenzenes—New Photoswitches for Application in Biological Systems. Molecules 2022; 27:molecules27185836. [PMID: 36144571 PMCID: PMC9504382 DOI: 10.3390/molecules27185836] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 08/29/2022] [Accepted: 09/06/2022] [Indexed: 11/19/2022] Open
Abstract
Dibenzo[b, f]oxepine derivatives are an important scaffold in natural, medicinal chemistry, and these derivatives occur in several medicinally relevant plants. Two dibenzo[b, f]oxepines were selected and connected with appropriate fluorine azobenzenes. In the next step, the geometry of E/Z isomers was analyzed using density functional theory (DFT) calculations. Then the energies of the HOMO and LUMO orbitals were calculated for the E/Z isomers to determine the HOMO-LUMO gap. Next, modeling of the interaction between the obtained isomers of the compounds and the colchicine α and β-tubulin binding site was performed. The investigated isomers interact with the colchicine binding site in tubulin with a part of the dibenzo[b, f]oxepine or in a part of the azo switch, or both at the same time. Based on the UV-VIS spectra, it was found that in the case of compounds with an azo bond in the meta position, the absorption bands n→π* for both geometric isomers and their separation from π→π* are visible. These derivatives therefore have the potential to be used in photopharmacology.
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10
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Josef V, Hampel F, Dube H. Heterocyclic Hemithioindigos: Highly Advantageous Properties as Molecular Photoswitches. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202210855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Verena Josef
- FAU: Friedrich-Alexander-Universitat Erlangen-Nurnberg Chemistry and Pharmacy GERMANY
| | - Frank Hampel
- FAU: Friedrich-Alexander-Universitat Erlangen-Nurnberg Chemistry and Pharmacy GERMANY
| | - Henry Dube
- Friedrich-Alexander-Universitat Erlangen-Nurnberg Chemistry and Pharmacy Nikolaus-Fiebiger-Str. 10 91058 Erlangen GERMANY
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11
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Kirchner S, Pianowski Z. Photopharmacology of Antimitotic Agents. Int J Mol Sci 2022; 23:5657. [PMID: 35628467 PMCID: PMC9145521 DOI: 10.3390/ijms23105657] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 05/16/2022] [Accepted: 05/17/2022] [Indexed: 01/12/2023] Open
Abstract
Antimitotic agents such as the clinically approved vinca alkaloids, taxanes and epothilone can arrest cell growth during interphase and are therefore among the most important drugs available for treating cancer. These agents suppress microtubule dynamics and thus interfere with intracellular transport, inhibit cell proliferation and promote cell death. Because these drugs target biological processes that are essential to all cells, they face an additional challenge when compared to most other drug classes. General toxicity can limit the applicable dose and therefore reduce therapeutic benefits. Photopharmacology aims to avoid these side-effects by introducing compounds that can be applied globally to cells in their inactive form, then be selectively induced to bioactivity in targeted cells or tissue during a defined time window. This review discusses photoswitchable analogues of antimitotic agents that have been developed by combining different photoswitchable motifs with microtubule-stabilizing or microtubule-destabilizing agents.
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Affiliation(s)
- Susanne Kirchner
- Institute of Organic Chemistry, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany;
| | - Zbigniew Pianowski
- Institute of Organic Chemistry, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany;
- Institute of Biological and Chemical Systems–FMS, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
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12
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Thorn-Seshold O, Meiring JCM. Photocontrolling Microtubule Dynamics with Photoswitchable Chemical Reagents. METHODS IN MOLECULAR BIOLOGY (CLIFTON, N.J.) 2022; 2430:403-430. [PMID: 35476347 DOI: 10.1007/978-1-0716-1983-4_26] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Microtubule dynamics can be inhibited with sub-second temporal resolution and cellular-scale spatial resolution, by using precise illuminations to optically pattern where and when photoswitchable microtubule-inhibiting chemical reagents exert their latent bioactivity. The recently available reagents (SBTub, PST, STEpo, AzTax, PHTub) now enable researchers to use light to reversibly modulate microtubule-dependent processes in eukaryotes, in 2D and 3D cell culture as well as in vivo, across a variety of model organisms: with applications in fields from cargo transport to cell migration, cell division, and embryonic development.Here we give an introduction to using these photoswitchable microtubule inhibitors in cells. We describe the theory of small molecule photoswitching, and the unique performance features, usage requirements, and limitations that photoswitchable chemical reagents have; then we summarize the major classes of photoswitchable microtubule inhibitors that are currently available, with the properties that suit them to different applications, and troubleshooting measures for avoiding common mistakes. We outline workflows to establish cellular assays where they are used to optically control microtubule dynamics in a temporally reversible fashion with spatial specificity down to a single selected cell within a field of view. The methods in this chapter also equip the reader to tackle advanced uses of photoswitchable chemical reagents, in 3D culture and in vivo.
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Affiliation(s)
- Oliver Thorn-Seshold
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich, Germany.
| | - Joyce C M Meiring
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht, The Netherlands
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13
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Eli S, Castagna R, Mapelli M, Parisini E. Recent Approaches to the Identification of Novel Microtubule-Targeting Agents. Front Mol Biosci 2022; 9:841777. [PMID: 35425809 PMCID: PMC9002125 DOI: 10.3389/fmolb.2022.841777] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 02/21/2022] [Indexed: 12/05/2022] Open
Abstract
Microtubules are key components of the eukaryotic cytoskeleton with essential roles in cell division, intercellular transport, cell morphology, motility, and signal transduction. They are composed of protofilaments of heterodimers of α-tubulin and β-tubulin organized as rigid hollow cylinders that can assemble into large and dynamic intracellular structures. Consistent with their involvement in core cellular processes, affecting microtubule assembly results in cytotoxicity and cell death. For these reasons, microtubules are among the most important targets for the therapeutic treatment of several diseases, including cancer. The vast literature related to microtubule stabilizers and destabilizers has been reviewed extensively in recent years. Here we summarize recent experimental and computational approaches for the identification of novel tubulin modulators and delivery strategies. These include orphan small molecules, PROTACs as well as light-sensitive compounds that can be activated with high spatio-temporal accuracy and that represent promising tools for precision-targeted chemotherapy.
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Affiliation(s)
- Susanna Eli
- IEO, European Institute of Oncology IRCCS, Milan, Italy
| | - Rossella Castagna
- Latvian Institute of Organic Synthesis, Aizkraukles Iela 21, Riga, Latvia
| | - Marina Mapelli
- IEO, European Institute of Oncology IRCCS, Milan, Italy
- *Correspondence: Marina Mapelli, ; Emilio Parisini,
| | - Emilio Parisini
- Latvian Institute of Organic Synthesis, Aizkraukles Iela 21, Riga, Latvia
- *Correspondence: Marina Mapelli, ; Emilio Parisini,
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14
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Gao L, Meiring JCM, Varady A, Ruider IE, Heise C, Wranik M, Velasco CD, Taylor JA, Terni B, Weinert T, Standfuss J, Cabernard CC, Llobet A, Steinmetz MO, Bausch AR, Distel M, Thorn-Seshold J, Akhmanova A, Thorn-Seshold O. In Vivo Photocontrol of Microtubule Dynamics and Integrity, Migration and Mitosis, by the Potent GFP-Imaging-Compatible Photoswitchable Reagents SBTubA4P and SBTub2M. J Am Chem Soc 2022; 144:5614-5628. [PMID: 35290733 PMCID: PMC8972266 DOI: 10.1021/jacs.2c01020] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Photoswitchable reagents are powerful tools for high-precision studies in cell biology. When these reagents are globally administered yet locally photoactivated in two-dimensional (2D) cell cultures, they can exert micron- and millisecond-scale biological control. This gives them great potential for use in biologically more relevant three-dimensional (3D) models and in vivo, particularly for studying systems with inherent spatiotemporal complexity, such as the cytoskeleton. However, due to a combination of photoswitch isomerization under typical imaging conditions, metabolic liabilities, and insufficient water solubility at effective concentrations, the in vivo potential of photoswitchable reagents addressing cytosolic protein targets remains largely unrealized. Here, we optimized the potency and solubility of metabolically stable, druglike colchicinoid microtubule inhibitors based on the styrylbenzothiazole (SBT) scaffold that are nonresponsive to typical fluorescent protein imaging wavelengths and so enable multichannel imaging studies. We applied these reagents both to 3D organoids and tissue explants and to classic model organisms (zebrafish, clawed frog) in one- and two-protein imaging experiments, in which spatiotemporally localized illuminations allowed them to photocontrol microtubule dynamics, network architecture, and microtubule-dependent processes in vivo with cellular precision and second-level resolution. These nanomolar, in vivo capable photoswitchable reagents should open up new dimensions for high-precision cytoskeleton research in cargo transport, cell motility, cell division, and development. More broadly, their design can also inspire similarly capable optical reagents for a range of cytosolic protein targets, thus bringing in vivo photopharmacology one step closer to general realization.
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Affiliation(s)
- Li Gao
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
| | - Joyce C M Meiring
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht CH 3584, Netherlands
| | - Adam Varady
- St. Anna Children's Cancer Research Institute (CCRI), Vienna 1090, Austria
| | - Iris E Ruider
- Physics Department and Center for Protein Assemblies CPA, Technical University of Munich, Garching 85747, Germany
| | - Constanze Heise
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
| | - Maximilian Wranik
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Cecilia D Velasco
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapy, Institute of Neurosciences, University of Barcelona, L'Hospitalet de Llobregat, Barcelona 08907, Spain
- Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, Barcelona 08907, Spain
| | - Jennifer A Taylor
- Department of Biology, University of Washington, Seattle, Washington 98195, United States
| | - Beatrice Terni
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapy, Institute of Neurosciences, University of Barcelona, L'Hospitalet de Llobregat, Barcelona 08907, Spain
- Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, Barcelona 08907, Spain
| | - Tobias Weinert
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Jörg Standfuss
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Clemens C Cabernard
- Department of Biology, University of Washington, Seattle, Washington 98195, United States
| | - Artur Llobet
- Laboratory of Neurobiology, Department of Pathology and Experimental Therapy, Institute of Neurosciences, University of Barcelona, L'Hospitalet de Llobregat, Barcelona 08907, Spain
- Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, Barcelona 08907, Spain
| | - Michel O Steinmetz
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland
- Biozentrum, University of Basel, Basel 4056, Switzerland
| | - Andreas R Bausch
- Physics Department and Center for Protein Assemblies CPA, Technical University of Munich, Garching 85747, Germany
| | - Martin Distel
- St. Anna Children's Cancer Research Institute (CCRI), Vienna 1090, Austria
- Zebrafish Platform Austria for Preclinical Drug Screening (ZANDR), Vienna 1090, Austria
| | - Julia Thorn-Seshold
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
| | - Anna Akhmanova
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht CH 3584, Netherlands
| | - Oliver Thorn-Seshold
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
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15
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Gao L, Meiring JCM, Heise C, Rai A, Müller‐Deku A, Akhmanova A, Thorn‐Seshold J, Thorn‐Seshold O. Photoswitchable Epothilone-Based Microtubule Stabilisers Allow GFP-Imaging-Compatible, Optical Control over the Microtubule Cytoskeleton. Angew Chem Int Ed Engl 2022; 61:e202114614. [PMID: 34902214 PMCID: PMC9305116 DOI: 10.1002/anie.202114614] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Indexed: 11/29/2022]
Abstract
Optical methods to modulate microtubule dynamics show promise for reaching the micron- and millisecond-scale resolution needed to decrypt the roles of the cytoskeleton in biology. However, optical microtubule stabilisers are under-developed. We introduce "STEpos" as GFP-orthogonal, light-responsive epothilone-based microtubule stabilisers. They use a novel styrylthiazole photoswitch in a design to modulate hydrogen-bonding and steric effects that control epothilone potency. STEpos photocontrol microtubule dynamics and cell division with micron- and second-scale spatiotemporal precision. They substantially improve potency, solubility, and ease-of-use compared to previous optical microtubule stabilisers, and the structure-photoswitching-activity relationship insights in this work will guide future optimisations. The STEpo reagents can contribute greatly to high-precision research in cytoskeleton biophysics, cargo transport, cell motility, cell division, development, and neuroscience.
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Affiliation(s)
- Li Gao
- Department of PharmacyLudwig-Maximilians University of MunichButenandtstrasse 7Munich81377Germany
| | - Joyce C. M. Meiring
- Cell Biology, Neurobiology and BiophysicsDepartment of BiologyUtrecht UniversityPadualaan 83584 CHUtrechtNetherlands
| | - Constanze Heise
- Department of PharmacyLudwig-Maximilians University of MunichButenandtstrasse 7Munich81377Germany
| | - Ankit Rai
- Cell Biology, Neurobiology and BiophysicsDepartment of BiologyUtrecht UniversityPadualaan 83584 CHUtrechtNetherlands
| | - Adrian Müller‐Deku
- Department of PharmacyLudwig-Maximilians University of MunichButenandtstrasse 7Munich81377Germany
| | - Anna Akhmanova
- Cell Biology, Neurobiology and BiophysicsDepartment of BiologyUtrecht UniversityPadualaan 83584 CHUtrechtNetherlands
| | - Julia Thorn‐Seshold
- Department of PharmacyLudwig-Maximilians University of MunichButenandtstrasse 7Munich81377Germany
| | - Oliver Thorn‐Seshold
- Department of PharmacyLudwig-Maximilians University of MunichButenandtstrasse 7Munich81377Germany
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16
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Gao L, Meiring JCM, Heise C, Rai A, Müller‐Deku A, Akhmanova A, Thorn‐Seshold J, Thorn‐Seshold O. Photoswitchable Epothilone‐Based Microtubule Stabilisers Allow GFP‐Imaging‐Compatible, Optical Control over the Microtubule Cytoskeleton**. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202114614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Li Gao
- Department of Pharmacy Ludwig-Maximilians University of Munich Butenandtstrasse 7 Munich 81377 Germany
| | - Joyce C. M. Meiring
- Cell Biology, Neurobiology and Biophysics Department of Biology Utrecht University Padualaan 8 3584 CH Utrecht Netherlands
| | - Constanze Heise
- Department of Pharmacy Ludwig-Maximilians University of Munich Butenandtstrasse 7 Munich 81377 Germany
| | - Ankit Rai
- Cell Biology, Neurobiology and Biophysics Department of Biology Utrecht University Padualaan 8 3584 CH Utrecht Netherlands
| | - Adrian Müller‐Deku
- Department of Pharmacy Ludwig-Maximilians University of Munich Butenandtstrasse 7 Munich 81377 Germany
| | - Anna Akhmanova
- Cell Biology, Neurobiology and Biophysics Department of Biology Utrecht University Padualaan 8 3584 CH Utrecht Netherlands
| | - Julia Thorn‐Seshold
- Department of Pharmacy Ludwig-Maximilians University of Munich Butenandtstrasse 7 Munich 81377 Germany
| | - Oliver Thorn‐Seshold
- Department of Pharmacy Ludwig-Maximilians University of Munich Butenandtstrasse 7 Munich 81377 Germany
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17
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López‐Andarias J, Eblighatian K, Pasquer QTL, Assies L, Sakai N, Hoogendoorn S, Matile S. Photocleavable Fluorescent Membrane Tension Probes: Fast Release with Spatiotemporal Control in Inner Leaflets of Plasma Membrane, Nuclear Envelope, and Secretory Pathway. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202113163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Javier López‐Andarias
- Department of Organic Chemistry National Centre of Competence in Research (NCCR) Chemical Biology University of Geneva Geneva Switzerland
| | - Krikor Eblighatian
- Department of Organic Chemistry National Centre of Competence in Research (NCCR) Chemical Biology University of Geneva Geneva Switzerland
| | - Quentin T. L. Pasquer
- Department of Organic Chemistry National Centre of Competence in Research (NCCR) Chemical Biology University of Geneva Geneva Switzerland
| | - Lea Assies
- Department of Organic Chemistry National Centre of Competence in Research (NCCR) Chemical Biology University of Geneva Geneva Switzerland
| | - Naomi Sakai
- Department of Organic Chemistry National Centre of Competence in Research (NCCR) Chemical Biology University of Geneva Geneva Switzerland
| | - Sascha Hoogendoorn
- Department of Organic Chemistry National Centre of Competence in Research (NCCR) Chemical Biology University of Geneva Geneva Switzerland
| | - Stefan Matile
- Department of Organic Chemistry National Centre of Competence in Research (NCCR) Chemical Biology University of Geneva Geneva Switzerland
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18
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López‐Andarias J, Eblighatian K, Pasquer QTL, Assies L, Sakai N, Hoogendoorn S, Matile S. Photocleavable Fluorescent Membrane Tension Probes: Fast Release with Spatiotemporal Control in Inner Leaflets of Plasma Membrane, Nuclear Envelope, and Secretory Pathway. Angew Chem Int Ed Engl 2022; 61:e202113163. [PMID: 34734671 PMCID: PMC9299180 DOI: 10.1002/anie.202113163] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/25/2021] [Indexed: 12/25/2022]
Abstract
Mechanosensitive flipper probes are attracting interest as fluorescent reporters of membrane order and tension in biological systems. We introduce PhotoFlippers, which contain a photocleavable linker and an ultralong tether between mechanophore and various targeting motifs. Upon irradiation, the original probe is released and labels the most ordered membrane that is accessible by intermembrane transfer. Spatiotemporal control from photocleavable flippers is essential to access open, dynamic or elusive membrane motifs without chemical or physical interference. For instance, fast release with light is shown to place the original small-molecule probes into the innermost leaflet of the nuclear envelope to image changes in membrane tension, at specific points in time of membrane trafficking along the secretory pathway, or in the inner leaflet of the plasma membrane to explore membrane asymmetry. These results identify PhotoFlippers as useful chemistry tools to enable research in biology.
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Affiliation(s)
- Javier López‐Andarias
- Department of Organic ChemistryNational Centre of Competence in Research (NCCR) Chemical BiologyUniversity of GenevaGenevaSwitzerland
| | - Krikor Eblighatian
- Department of Organic ChemistryNational Centre of Competence in Research (NCCR) Chemical BiologyUniversity of GenevaGenevaSwitzerland
| | - Quentin T. L. Pasquer
- Department of Organic ChemistryNational Centre of Competence in Research (NCCR) Chemical BiologyUniversity of GenevaGenevaSwitzerland
| | - Lea Assies
- Department of Organic ChemistryNational Centre of Competence in Research (NCCR) Chemical BiologyUniversity of GenevaGenevaSwitzerland
| | - Naomi Sakai
- Department of Organic ChemistryNational Centre of Competence in Research (NCCR) Chemical BiologyUniversity of GenevaGenevaSwitzerland
| | - Sascha Hoogendoorn
- Department of Organic ChemistryNational Centre of Competence in Research (NCCR) Chemical BiologyUniversity of GenevaGenevaSwitzerland
| | - Stefan Matile
- Department of Organic ChemistryNational Centre of Competence in Research (NCCR) Chemical BiologyUniversity of GenevaGenevaSwitzerland
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19
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Du Y, Shao Z, Xu Q, Li Z, Shao X. Azobenzene-Avermectin B1a Derivatives for Optical Modulation of Insect Behaviors. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:15530-15537. [PMID: 34914386 DOI: 10.1021/acs.jafc.1c05036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Naturally occurring avermectins are allosteric modulators of glutamate-gated chloride channels (GluCls) and possess exceptionally potent anthelmintic, acaricidal, and insecticidal activities. Here, we develop photoswitchable azobenzene-avermectin (ABAVM) derivatives, which can be photoactivated upon ultraviolet irradiation. After illumination, the best compound p-AB4″AVM had a 1.88-fold and 2.74-fold insecticidal activity enhancement toward Culex pipiens pallens and Mythimna separata larvae, respectively. p-AB4″AVM allows for optical regulation of dorsal unpaired median neuron membrane potential with a 2.15-fold fluorescence intensity decrease after illumination. p-AB4″AVM and p-AB5AVM enable optical modulation of the behavioral response of Culex pipiens pallens larvae with 1- and 4-fold reduced mobility upon irradiation, respectively. The ABAVMs could be used to reversibly manipulate GluCls with light and may be useful for the mechanistic study of macrocyclic lactone insecticides.
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Affiliation(s)
- Yaoyao Du
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Zhongli Shao
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Qi Xu
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Zhong Li
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Xusheng Shao
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
- Shanghai Frontier Science Research Base of Optogenetic Techniques for Cell Metabolism, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
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20
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Bruekers JP, Bakker R, White PB, Tinnemans P, Elemans JA, Nolte RJ. Stabilization of thermally unstable photoisomers of pyridinium-functionalized hemithioindigo switches by host-guest complexation. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132499] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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21
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Volarić J, Szymanski W, Simeth NA, Feringa BL. Molecular photoswitches in aqueous environments. Chem Soc Rev 2021; 50:12377-12449. [PMID: 34590636 PMCID: PMC8591629 DOI: 10.1039/d0cs00547a] [Citation(s) in RCA: 132] [Impact Index Per Article: 44.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Indexed: 12/17/2022]
Abstract
Molecular photoswitches enable dynamic control of processes with high spatiotemporal precision, using light as external stimulus, and hence are ideal tools for different research areas spanning from chemical biology to smart materials. Photoswitches are typically organic molecules that feature extended aromatic systems to make them responsive to (visible) light. However, this renders them inherently lipophilic, while water-solubility is of crucial importance to apply photoswitchable organic molecules in biological systems, like in the rapidly emerging field of photopharmacology. Several strategies for solubilizing organic molecules in water are known, but there are not yet clear rules for applying them to photoswitchable molecules. Importantly, rendering photoswitches water-soluble has a serious impact on both their photophysical and biological properties, which must be taken into consideration when designing new systems. Altogether, these aspects pose considerable challenges for successfully applying molecular photoswitches in aqueous systems, and in particular in biologically relevant media. In this review, we focus on fully water-soluble photoswitches, such as those used in biological environments, in both in vitro and in vivo studies. We discuss the design principles and prospects for water-soluble photoswitches to inspire and enable their future applications.
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Affiliation(s)
- Jana Volarić
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
| | - Wiktor Szymanski
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
- Department of Radiology, Medical Imaging Center, University of Groningen, University Medical Centre Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Nadja A Simeth
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
- Institute for Organic and Biomolecular Chemistry, University of Göttingen, Tammannstr. 2, 37077 Göttingen, Germany
| | - Ben L Feringa
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
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22
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Thumser S, Köttner L, Hoffmann N, Mayer P, Dube H. All-Red-Light Photoswitching of Indirubin Controlled by Supramolecular Interactions. J Am Chem Soc 2021; 143:18251-18260. [PMID: 34665961 PMCID: PMC8867725 DOI: 10.1021/jacs.1c08206] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
![]()
Red-light responsiveness
of photoswitches is a highly desired property
for many important application areas such as biology or material sciences.
The main approach to elicit this property uses strategic substitution
of long-known photoswitch motives such as azobenzenes or diarylethenes.
Only very few photoswitches possess inherent red-light absorption
of their core chromophore structures. Here, we present a strategy
to convert the long-known purple indirubin dye into a prolific red-light-responsive
photoswitch. In a supramolecular approach, its photochromism can be
changed from a negative to a positive one, while at the same time,
significantly higher yields of the metastable E-isomer
are obtained upon irradiation. E- to Z-photoisomerization can then also be induced by red light of longer
wavelengths. Indirubin therefore represents a unique example of reversible
photoswitching using entirely red light for both switching directions.
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Affiliation(s)
- Stefan Thumser
- Friedrich-Alexander Universität Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Laura Köttner
- Friedrich-Alexander Universität Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Nadine Hoffmann
- Ludwig-Maximilians Universität München, Department of Chemistry and Center for Integrated Protein Science CIPSM, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Peter Mayer
- Ludwig-Maximilians Universität München, Department of Chemistry and Center for Integrated Protein Science CIPSM, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Henry Dube
- Friedrich-Alexander Universität Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
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23
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Sailer A, Meiring JCM, Heise C, Pettersson LN, Akhmanova A, Thorn‐Seshold J, Thorn‐Seshold O. Pyrrole Hemithioindigo Antimitotics with Near-Quantitative Bidirectional Photoswitching that Photocontrol Cellular Microtubule Dynamics with Single-Cell Precision*. Angew Chem Int Ed Engl 2021; 60:23695-23704. [PMID: 34460143 PMCID: PMC8596636 DOI: 10.1002/anie.202104794] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 07/23/2021] [Indexed: 11/07/2022]
Abstract
We report the first cellular application of the emerging near-quantitative photoswitch pyrrole hemithioindigo, by rationally designing photopharmaceutical PHTub inhibitors of the cytoskeletal protein tubulin. PHTubs allow simultaneous visible-light imaging and photoswitching in live cells, delivering cell-precise photomodulation of microtubule dynamics, and photocontrol over cell cycle progression and cell death. This is the first acute use of a hemithioindigo photopharmaceutical for high-spatiotemporal-resolution biological control in live cells. It additionally demonstrates the utility of near-quantitative photoswitches, by enabling a dark-active design to overcome residual background activity during cellular photopatterning. This work opens up new horizons for high-precision microtubule research using PHTubs and shows the cellular applicability of pyrrole hemithioindigo as a valuable scaffold for photocontrol of a range of other biological targets.
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Affiliation(s)
- Alexander Sailer
- Department of PharmacyLudwig-Maximilians University of MunichButenandtstrasse 781377MunichGermany
| | - Joyce C. M. Meiring
- Department of BiologyUtrecht UniversityPadualaan 83584UtrechtThe Netherlands
| | - Constanze Heise
- Department of PharmacyLudwig-Maximilians University of MunichButenandtstrasse 781377MunichGermany
| | - Linda N. Pettersson
- Department of PharmacyLudwig-Maximilians University of MunichButenandtstrasse 781377MunichGermany
| | - Anna Akhmanova
- Department of BiologyUtrecht UniversityPadualaan 83584UtrechtThe Netherlands
| | - Julia Thorn‐Seshold
- Department of PharmacyLudwig-Maximilians University of MunichButenandtstrasse 781377MunichGermany
| | - Oliver Thorn‐Seshold
- Department of PharmacyLudwig-Maximilians University of MunichButenandtstrasse 781377MunichGermany
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24
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Sailer A, Meiring JCM, Heise C, Pettersson LN, Akhmanova A, Thorn‐Seshold J, Thorn‐Seshold O. Pyrrole Hemithioindigo Antimitotics with Near‐Quantitative Bidirectional Photoswitching that Photocontrol Cellular Microtubule Dynamics with Single‐Cell Precision**. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104794] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Alexander Sailer
- Department of Pharmacy Ludwig-Maximilians University of Munich Butenandtstrasse 7 81377 Munich Germany
| | - Joyce C. M. Meiring
- Department of Biology Utrecht University Padualaan 8 3584 Utrecht The Netherlands
| | - Constanze Heise
- Department of Pharmacy Ludwig-Maximilians University of Munich Butenandtstrasse 7 81377 Munich Germany
| | - Linda N. Pettersson
- Department of Pharmacy Ludwig-Maximilians University of Munich Butenandtstrasse 7 81377 Munich Germany
| | - Anna Akhmanova
- Department of Biology Utrecht University Padualaan 8 3584 Utrecht The Netherlands
| | - Julia Thorn‐Seshold
- Department of Pharmacy Ludwig-Maximilians University of Munich Butenandtstrasse 7 81377 Munich Germany
| | - Oliver Thorn‐Seshold
- Department of Pharmacy Ludwig-Maximilians University of Munich Butenandtstrasse 7 81377 Munich Germany
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25
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Matsuo K, Tamaoki N. Rational design and development of a lit-active photoswitchable inhibitor targeting CENP-E. Org Biomol Chem 2021; 19:6979-6984. [PMID: 34346473 DOI: 10.1039/d1ob01332g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In the emerging field of photopharmacology, synthetic photoswitches based on reversible photochemical reactions are fused to bioactive molecules. Azobenzene derivatives, which can undergo trans-cis photoisomerization, are typical photoswitches. Most azobenzene-based photochemical tools are active in the thermodynamically stable trans, but not cis, form. cis-Active photochemical tools would be ideal because they can be "initially inactive and active after light illumination" in a reversible mode only by light illumination. However, only a few rational strategies for constructing such "lit-active" photopharmacological tools has been developed. Herein, we report a rationally designed lit-active photoswitchable inhibitor targeting centromere-associated protein E (CENP-E). Using the lit-active inhibitor, we were able to photoregulate CENP-E-dependent mitotic chromosome location in cells. This study provides a framework to facilitate further progress in the development of photopharmacological tools.
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Affiliation(s)
- Kazuya Matsuo
- Research Institute for Electronic Science, Hokkaido University, Kita 20, Nishi 10, Kita-ku, Sapporo, 001-0020, Japan.
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26
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Kiss FL, Corbet BP, Simeth NA, Feringa BL, Crespi S. Predicting the substituent effects in the optical and electrochemical properties of N,N'-substituted isoindigos. Photochem Photobiol Sci 2021; 20:927-938. [PMID: 34227039 PMCID: PMC8550769 DOI: 10.1007/s43630-021-00071-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 06/24/2021] [Indexed: 11/30/2022]
Abstract
Isoindigo, the structural isomer of the well-known dye indigo, has seen a major revival recently because of the increasing interest of its use as a potential drug core structure and for the development of organic photovoltaic materials. Highly beneficial for diverse applications are its facile synthesis, straightforward functionalisation and the broad absorption band in the visible range. Moreover, its intrinsic electron deficiency renders isoindigo a promising acceptor structure in bulk heterojunction architectures. Here we present new insights into the substituent effects of N-functionalised isoindigos, developing a reliable and fast in silico screening approach of a library of compounds. Using experimental UV-Vis and electrochemical data increased the accuracy of the TD-DFT method employed. This procedure allowed us to accurately predict the optical and electrochemical properties of N-functionalised isoindigos and the elucidation of the relationship between substituent effects and electronic properties.
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Affiliation(s)
- Ferdinand L Kiss
- Faculty for Science and Engineering, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
- Department Chemie, Ludwig-Maximilians-Universität München, 81377, Munich, Germany
| | - Brian P Corbet
- Faculty for Science and Engineering, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Nadja A Simeth
- Faculty for Science and Engineering, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Ben L Feringa
- Faculty for Science and Engineering, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands.
| | - Stefano Crespi
- Faculty for Science and Engineering, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands.
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27
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Targeted Cancer Therapy Using Compounds Activated by Light. Cancers (Basel) 2021; 13:cancers13133237. [PMID: 34209493 PMCID: PMC8269035 DOI: 10.3390/cancers13133237] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 06/18/2021] [Accepted: 06/24/2021] [Indexed: 12/21/2022] Open
Abstract
Cancer chemotherapy is affected by a modest selectivity and toxic side effects of pharmacological interventions. Among novel approaches to overcome this limitation and to bring to therapy more potent and selective agents is the use of light for selective activation of anticancer compounds. In this review, we focus on the anticancer applications of two light-activated approaches still in the experimental phase: photoremovable protecting groups ("photocages") and photoswitches. We describe the structural considerations behind the development of novel compounds and the plethora of assays used to confirm whether the photochemical and pharmacological properties are meeting the stringent criteria for an efficient in vivo light-dependent activation. Despite its immense potential, light activation brings many challenges, and the complexity of the task is very demanding. Currently, we are still deeply in the phase of pharmacological tools, but the vivid research and rapid development bring the light of hope for potential clinical use.
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28
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Gao L, Meiring JCM, Kraus Y, Wranik M, Weinert T, Pritzl SD, Bingham R, Ntouliou E, Jansen KI, Olieric N, Standfuss J, Kapitein LC, Lohmüller T, Ahlfeld J, Akhmanova A, Steinmetz MO, Thorn-Seshold O. A Robust, GFP-Orthogonal Photoswitchable Inhibitor Scaffold Extends Optical Control over the Microtubule Cytoskeleton. Cell Chem Biol 2021; 28:228-241.e6. [PMID: 33275880 DOI: 10.1016/j.chembiol.2020.11.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 11/10/2020] [Accepted: 11/13/2020] [Indexed: 12/16/2022]
Abstract
Optically controlled chemical reagents, termed "photopharmaceuticals," are powerful tools for precise spatiotemporal control of proteins particularly when genetic methods, such as knockouts or optogenetics are not viable options. However, current photopharmaceutical scaffolds, such as azobenzenes are intolerant of GFP/YFP imaging and are metabolically labile, posing severe limitations for biological use. We rationally designed a photoswitchable "SBT" scaffold to overcome these problems, then derivatized it to create exceptionally metabolically robust and fully GFP/YFP-orthogonal "SBTub" photopharmaceutical tubulin inhibitors. Lead compound SBTub3 allows temporally reversible, cell-precise, and even subcellularly precise photomodulation of microtubule dynamics, organization, and microtubule-dependent processes. By overcoming the previous limitations of microtubule photopharmaceuticals, SBTubs offer powerful applications in cell biology, and their robustness and druglikeness are favorable for intracellular biological control in in vivo applications. We furthermore expect that the robustness and imaging orthogonality of the SBT scaffold will inspire other derivatizations directed at extending the photocontrol of a range of other biological targets.
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Affiliation(s)
- Li Gao
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
| | - Joyce C M Meiring
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht 3584, Netherlands
| | - Yvonne Kraus
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
| | - Maximilian Wranik
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Tobias Weinert
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Stefanie D Pritzl
- Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians University of Munich, Munich 80539, Germany
| | - Rebekkah Bingham
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
| | - Evangelia Ntouliou
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
| | - Klara I Jansen
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht 3584, Netherlands
| | - Natacha Olieric
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Jörg Standfuss
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Lukas C Kapitein
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht 3584, Netherlands
| | - Theobald Lohmüller
- Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians University of Munich, Munich 80539, Germany
| | - Julia Ahlfeld
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany
| | - Anna Akhmanova
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht 3584, Netherlands
| | - Michel O Steinmetz
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen 5232, Switzerland; Biozentrum, University of Basel, Basel 4056, Switzerland
| | - Oliver Thorn-Seshold
- Department of Pharmacy, Ludwig-Maximilians University of Munich, Munich 81377, Germany.
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29
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Uhl E, Wolff F, Mangal S, Dube H, Zanin E. Light-Controlled Cell-Cycle Arrest and Apoptosis. Angew Chem Int Ed Engl 2020; 60:1187-1196. [PMID: 33035402 PMCID: PMC7839536 DOI: 10.1002/anie.202008267] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Indexed: 12/19/2022]
Abstract
Cell‐cycle interference by small molecules has widely been used to study fundamental biological mechanisms and to treat a great variety of diseases, most notably cancer. However, at present only limited possibilities exist for spatio‐temporal control of the cell cycle. Here we report on a photocaging strategy to reversibly arrest the cell cycle at metaphase or induce apoptosis using blue‐light irradiation. The versatile proteasome inhibitor MG132 is photocaged directly at the reactive aldehyde function effectively masking its biological activity. Upon irradiation reversible cell‐cycle arrest in the metaphase is demonstrated to take place in vivo. Similarly, apoptosis can efficiently be induced by irradiation of human cancer cells. With the developed photopharmacological approach spatio‐temporal control of the cell cycle is thus enabled with very high modulation, as caged MG132 shows no effect on proliferation in the dark. In addition, full compatibility of photo‐controlled uncaging with dynamic microscopy techniques in vivo is demonstrated. This visible‐light responsive tool should be of great value for biological as well as medicinal approaches in need of high‐precision targeting of the proteasome and thereby the cell cycle and apoptosis.
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Affiliation(s)
- Edgar Uhl
- Ludwig-Maximilians-Universität München, Department of Chemistry and Center for Integrated Protein Science CIPSM, Butenandtstr. 5-13, 81377, München, Germany
| | - Friederike Wolff
- Ludwig-Maximilians-Universität München, Center for Integrated Protein Science CIPSM, Department Biology II, Planegg-Martinsried, 82152, München, Germany
| | - Sriyash Mangal
- Ludwig-Maximilians-Universität München, Center for Integrated Protein Science CIPSM, Department Biology II, Planegg-Martinsried, 82152, München, Germany
| | - Henry Dube
- Ludwig-Maximilians-Universität München, Department of Chemistry and Center for Integrated Protein Science CIPSM, Butenandtstr. 5-13, 81377, München, Germany.,Current address: Friedrich-Alexander-Universität Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Nikolaus-Fiebiger-Str. 10, 91058, Erlangen, Germany
| | - Esther Zanin
- Ludwig-Maximilians-Universität München, Center for Integrated Protein Science CIPSM, Department Biology II, Planegg-Martinsried, 82152, München, Germany
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30
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Uhl E, Wolff F, Mangal S, Dube H, Zanin E. Light‐Controlled Cell‐Cycle Arrest and Apoptosis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Edgar Uhl
- Ludwig-Maximilians-Universität München Department of Chemistry and Center for Integrated Protein Science CIPSM Butenandtstr. 5–13 81377 München Germany
| | - Friederike Wolff
- Ludwig-Maximilians-Universität München Center for Integrated Protein Science CIPSM Department Biology II Planegg-Martinsried 82152 München Germany
| | - Sriyash Mangal
- Ludwig-Maximilians-Universität München Center for Integrated Protein Science CIPSM Department Biology II Planegg-Martinsried 82152 München Germany
| | - Henry Dube
- Ludwig-Maximilians-Universität München Department of Chemistry and Center for Integrated Protein Science CIPSM Butenandtstr. 5–13 81377 München Germany
- Current address: Friedrich-Alexander-Universität Erlangen-Nürnberg Department of Chemistry and Pharmacy Nikolaus-Fiebiger-Str. 10 91058 Erlangen Germany
| | - Esther Zanin
- Ludwig-Maximilians-Universität München Center for Integrated Protein Science CIPSM Department Biology II Planegg-Martinsried 82152 München Germany
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31
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Welleman IM, Hoorens MWH, Feringa BL, Boersma HH, Szymański W. Photoresponsive molecular tools for emerging applications of light in medicine. Chem Sci 2020; 11:11672-11691. [PMID: 34094410 PMCID: PMC8162950 DOI: 10.1039/d0sc04187d] [Citation(s) in RCA: 121] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 10/14/2020] [Indexed: 12/29/2022] Open
Abstract
Light-based therapeutic and imaging modalities, which emerge in clinical applications, rely on molecular tools, such as photocleavable protecting groups and photoswitches that respond to photonic stimulus and translate it into a biological effect. However, optimisation of their key parameters (activation wavelength, band separation, fatigue resistance and half-life) is necessary to enable application in the medical field. In this perspective, we describe the applications scenarios that can be envisioned in clinical practice and then we use those scenarios to explain the necessary properties that the photoresponsive tools used to control biological function should possess, highlighted by examples from medical imaging, drug delivery and photopharmacology. We then present how the (photo)chemical parameters are currently being optimized and an outlook is given on pharmacological aspects (toxicity, solubility, and stability) of light-responsive molecules. With these interdisciplinary insights, we aim to inspire the future directions for the development of photocontrolled tools that will empower clinical applications of light.
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Affiliation(s)
- Ilse M Welleman
- Department of Radiology, Medical Imaging Center, University Medical Center Groningen Groningen The Netherlands
- Stratingh Institute for Chemistry, University of Groningen Groningen The Netherlands
| | - Mark W H Hoorens
- Department of Radiology, Medical Imaging Center, University Medical Center Groningen Groningen The Netherlands
- Stratingh Institute for Chemistry, University of Groningen Groningen The Netherlands
| | - Ben L Feringa
- Stratingh Institute for Chemistry, University of Groningen Groningen The Netherlands
| | - Hendrikus H Boersma
- Department of Radiology, Medical Imaging Center, University Medical Center Groningen Groningen The Netherlands
- Departments of Clinical Pharmacy and Pharmacology, Nuclear Medicine and Molecular Imaging, University Medical Center Groningen Groningen The Netherlands
| | - Wiktor Szymański
- Department of Radiology, Medical Imaging Center, University Medical Center Groningen Groningen The Netherlands
- Stratingh Institute for Chemistry, University of Groningen Groningen The Netherlands
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Photoswitchable paclitaxel-based microtubule stabilisers allow optical control over the microtubule cytoskeleton. Nat Commun 2020; 11:4640. [PMID: 32934232 PMCID: PMC7493900 DOI: 10.1038/s41467-020-18389-6] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 08/19/2020] [Indexed: 02/06/2023] Open
Abstract
Small molecule inhibitors are prime reagents for studies in microtubule cytoskeleton research, being applicable across a range of biological models and not requiring genetic engineering. However, traditional chemical inhibitors cannot be experimentally applied with spatiotemporal precision suiting the length and time scales inherent to microtubule-dependent cellular processes. We have synthesised photoswitchable paclitaxel-based microtubule stabilisers, whose binding is induced by photoisomerisation to their metastable state. Photoisomerising these reagents in living cells allows optical control over microtubule network integrity and dynamics, cell division and survival, with biological response on the timescale of seconds and spatial precision to the level of individual cells within a population. In primary neurons, they enable regulation of microtubule dynamics resolved to subcellular regions within individual neurites. These azobenzene-based microtubule stabilisers thus enable non-invasive, spatiotemporally precise modulation of the microtubule cytoskeleton in living cells, and promise new possibilities for studying intracellular transport, cell motility, and neuronal physiology. Light-based modulation of the microtubule (MT) cytoskeleton is an attractive goal for spatiotemporally-resolved MT studies. Here the authors develop a first generation photoswitchable small molecule MT stabiliser based on paclitaxel, allowing optical control over cellular MT dynamics.
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33
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Dcona MM, Mitra K, Hartman MCT. Photocontrolled activation of small molecule cancer therapeutics. RSC Med Chem 2020; 11:982-1002. [PMID: 33479692 PMCID: PMC7513389 DOI: 10.1039/d0md00107d] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 07/19/2020] [Indexed: 12/11/2022] Open
Abstract
Cancer remains one of the leading causes of death worldwide. Conventional treatment of the disease is comprised of chemotherapy, radiation and surgery among other treatment approaches. Chemotherapy is plagued by multiple side-effects caused due to non-specific drug action. Light-based therapies offer an alternative treatment approach that can be fine tuned to achieve the desired effect to treat the disease and address challenges posed by chemotherapeutic side-effects. Photodynamic therapy (PDT) is one of the light mediated treatment modalities that has been successfully applied to treat superficial malignancies with high-efficiency, although its dependence on normoxic conditions limits its efficiency to treat deep-seated tumors. On the other hand, light-sensitive drug-mimetics and drug-release platforms have been deemed efficient in preclinical settings to induce cancer cell death with minimal collateral damage. Drawing from about a decade's worth of examples, we highlight the application of photosensitive molecules as an alternative therapeutic option to PDT and describe their designs that influence the biology of the cancer cells, in turn affecting their viability with high spatio-temporal control.
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Affiliation(s)
- M Michael Dcona
- Department of Internal Medicine , Virginia Commonwealth University , 1201 East Marshall Street , Richmond , 23298 , Virginia , USA .
- Massey Cancer Center , 401 College St. , Richmond , 23219 , Virginia , USA
| | - Koushambi Mitra
- Massey Cancer Center , 401 College St. , Richmond , 23219 , Virginia , USA
- Department of Chemistry , Virginia Commonwealth University , 1001 W Main St , Richmond , 23284 , Virginia , USA
| | - Matthew C T Hartman
- Massey Cancer Center , 401 College St. , Richmond , 23219 , Virginia , USA
- Department of Chemistry , Virginia Commonwealth University , 1001 W Main St , Richmond , 23284 , Virginia , USA
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34
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Köttner L, Schildhauer M, Wiedbrauk S, Mayer P, Dube H. Oxidized Hemithioindigo Photoswitches-Influence of Oxidation State on (Photo)physical and Photochemical Properties. Chemistry 2020; 26:10712-10718. [PMID: 32485011 PMCID: PMC7496871 DOI: 10.1002/chem.202002176] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 05/28/2020] [Indexed: 11/05/2022]
Abstract
The photophysical and photochemical properties of sulfoxide and sulfone derivatives of hemithioindigo photoswitches are scrutinized and compared to the unoxidized parent chromophores. Oxidation results in significantly blue-shifted absorptions and mostly reduction of photochromism while thermal stabilities of individual isomers remain largely unaltered. Effective photoswitching takes place at shorter wavelengths compared to parent hemithioindigos and high isomeric yields can be obtained reversibly in the respective photostationary states. Reversible solid-state photoswitching is observed for a twisted sulfone derivative accompanied by visible color changes. These results establish oxidized hemithioindigo photoswitches as promising and versatile tools for robust light-control of molecular behavior for a wide range of applications.
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Affiliation(s)
- Laura Köttner
- Department of Chemistry and Center for Integrated Protein Science CIPSMLudwig-Maximilians-Universität MünchenButenandtstr. 5–1381377München
| | - Monika Schildhauer
- Department of Chemistry and Center for Integrated Protein Science CIPSMLudwig-Maximilians-Universität MünchenButenandtstr. 5–1381377München
| | - Sandra Wiedbrauk
- Department of Chemistry and Center for Integrated Protein Science CIPSMLudwig-Maximilians-Universität MünchenButenandtstr. 5–1381377München
| | - Peter Mayer
- Department of Chemistry and Center for Integrated Protein Science CIPSMLudwig-Maximilians-Universität MünchenButenandtstr. 5–1381377München
| | - Henry Dube
- Department of Chemistry and Center for Integrated Protein Science CIPSMLudwig-Maximilians-Universität MünchenButenandtstr. 5–1381377München
- Department of Chemistry and PharmacyFriedrich-Alexander-Universität Erlangen-NürnbergNikolaus-Fiebiger-Str. 1091058Erlangen
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35
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Carrascosa E, Petermayer C, Scholz MS, Bull JN, Dube H, Bieske EJ. Reversible Photoswitching of Isolated Ionic Hemiindigos with Visible Light. Chemphyschem 2020; 21:680-685. [PMID: 31736199 PMCID: PMC7277040 DOI: 10.1002/cphc.201900963] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Indexed: 01/06/2023]
Abstract
Indigoid chromophores have emerged as versatile molecular photoswitches, offering efficient reversible photoisomerization upon exposure to visible light. Here we report synthesis of a new class of permanently charged hemiindigos (HIs) and characterization of photochemical properties in gas phase and solution. Gas-phase studies, which involve exposing mobility-selected ions in a tandem ion mobility mass spectrometer to tunable wavelength laser radiation, demonstrate that the isolated HI ions are photochromic and can be reversibly photoswitched between Z and E isomers. The Z and E isomers have distinct photoisomerization response spectra with maxima separated by 40-80 nm, consistent with theoretical predictions for their absorption spectra. Solvation of the HI molecules in acetonitrile displaces the absorption bands to lower energy. Together, gas-phase action spectroscopy and solution NMR and UV/Vis absorption spectroscopy represent a powerful approach for studying the intrinsic photochemical properties of HI molecular switches.
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Affiliation(s)
- Eduardo Carrascosa
- School of ChemistryThe University of Melbourne3010Parkville (VIC)Australia
| | - Christian Petermayer
- Department für Chemie and Munich Center for Integrated Protein Science CIPSMLudwig-Maximilians-Universität München81377MunichGermany
| | - Michael S. Scholz
- School of ChemistryThe University of Melbourne3010Parkville (VIC)Australia
| | - James N. Bull
- School of ChemistryThe University of Melbourne3010Parkville (VIC)Australia
- School of Chemistry, Norwich Research ParkUniversity of East AngliaNorwichNR4 7TJUnited Kingdom
| | - Henry Dube
- Department für Chemie and Munich Center for Integrated Protein Science CIPSMLudwig-Maximilians-Universität München81377MunichGermany
| | - Evan J. Bieske
- School of ChemistryThe University of Melbourne3010Parkville (VIC)Australia
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Uhl E, Mayer P, Dube H. Active and Unidirectional Acceleration of Biaryl Rotation by a Molecular Motor. Angew Chem Int Ed Engl 2020; 59:5730-5737. [PMID: 31943681 PMCID: PMC7154650 DOI: 10.1002/anie.201913798] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 12/09/2019] [Indexed: 12/11/2022]
Abstract
Light-driven molecular motors possess immense potential as central driving units for future nanotechnology. Integration into larger molecular setups and transduction of their mechanical motions represents the current frontier of research. Herein we report on an integrated molecular machine setup allowing the transmission of potential energy from a motor unit onto a remote receiving entity. The setup consists of a motor unit connected covalently to a distant and sterically encumbered biaryl receiver. By action of the motor unit, single-bond rotation of the receiver is strongly accelerated and forced to proceed unidirectionally. The transmitted potential energy is directly measured as the extent to which energy degeneration is lifted in the thermal atropisomerization of this biaryl. Energy degeneracy is reduced by more than 1.5 kcal mol-1 , and rate accelerations of several orders of magnitude in terms of the rate constants are achieved.
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Affiliation(s)
- Edgar Uhl
- Ludwig-Maximilians-Universität MünchenDepartment of Chemistry and Center for Integrated Protein Science CIPSMButenandtstr. 5–1381377MünchenGermany
| | - Peter Mayer
- Ludwig-Maximilians-Universität MünchenDepartment of Chemistry and Center for Integrated Protein Science CIPSMButenandtstr. 5–1381377MünchenGermany
| | - Henry Dube
- Ludwig-Maximilians-Universität MünchenDepartment of Chemistry and Center for Integrated Protein Science CIPSMButenandtstr. 5–1381377MünchenGermany
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37
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Uhl E, Mayer P, Dube H. Active and Unidirectional Acceleration of Biaryl Rotation by a Molecular Motor. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201913798] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Edgar Uhl
- Ludwig-Maximilians-Universität München Department of Chemistry and Center for Integrated Protein Science CIPSM Butenandtstr. 5–13 81377 München Germany
| | - Peter Mayer
- Ludwig-Maximilians-Universität München Department of Chemistry and Center for Integrated Protein Science CIPSM Butenandtstr. 5–13 81377 München Germany
| | - Henry Dube
- Ludwig-Maximilians-Universität München Department of Chemistry and Center for Integrated Protein Science CIPSM Butenandtstr. 5–13 81377 München Germany
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Sailer A, Ermer F, Kraus Y, Bingham R, Lutter FH, Ahlfeld J, Thorn-Seshold O. Potent hemithioindigo-based antimitotics photocontrol the microtubule cytoskeleton in cellulo. Beilstein J Org Chem 2020; 16:125-134. [PMID: 32082431 PMCID: PMC7006478 DOI: 10.3762/bjoc.16.14] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Accepted: 11/13/2019] [Indexed: 12/23/2022] Open
Abstract
Background: Hemithioindigo is a promising molecular photoswitch that has only recently been applied as a photoswitchable pharmacophore for control over bioactivity in cellulo. Uniquely, in contrast to other photoswitches that have been applied to biology, the pseudosymmetric hemithioindigo scaffold has allowed the creation of both dark-active and lit-active photopharmaceuticals for the same binding site by a priori design. However, the potency of previous hemithioindigo photopharmaceuticals has not been optimal for their translation to other biological models. Results: Inspired by the structure of tubulin-inhibiting indanones, we created hemithioindigo-based indanone-like tubulin inhibitors (HITubs) and optimised their cellular potency as antimitotic photopharmaceuticals. These HITubs feature reliable and robust visible-light photoswitching and high fatigue resistance. The use of the hemithioindigo scaffold also permitted us to employ a para-hydroxyhemistilbene motif, a structural feature which is denied to most azobenzenes due to the negligibly short lifetimes of their metastable Z-isomers, which proved crucial to enhancing the potency and photoswitchability. The HITubs were ten times more potent than previously reported hemithioindigo photopharmaceutical antimitotics in a series of cell-free and cellular assays, and allowed robust photocontrol over tubulin polymerisation, microtubule (MT) network structure, cell cycle, and cell survival. Conclusions: HITubs represent a powerful addition to the growing toolbox of photopharmaceutical reagents for MT cytoskeleton research. Additionally, as the hemithioindigo scaffold allows photoswitchable bioactivity for substituent patterns inaccessible to the majority of current photopharmaceuticals, wider adoption of the hemithioindigo scaffold may significantly expand the scope of cellular and in vivo targets addressable by photopharmacology.
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Affiliation(s)
- Alexander Sailer
- Department of Pharmacy, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, Munich 81377, Germany
| | - Franziska Ermer
- Department of Pharmacy, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, Munich 81377, Germany
| | - Yvonne Kraus
- Department of Pharmacy, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, Munich 81377, Germany
| | - Rebekkah Bingham
- Department of Pharmacy, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, Munich 81377, Germany
| | - Ferdinand H Lutter
- Department of Pharmacy, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, Munich 81377, Germany
| | - Julia Ahlfeld
- Department of Pharmacy, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, Munich 81377, Germany
| | - Oliver Thorn-Seshold
- Department of Pharmacy, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, Munich 81377, Germany
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Kraus Y, Glas C, Melzer B, Gao L, Heise C, Preuße M, Ahlfeld J, Bracher F, Thorn-Seshold O. Isoquinoline-based biaryls as a robust scaffold for microtubule inhibitors. Eur J Med Chem 2020; 186:111865. [PMID: 31735573 DOI: 10.1016/j.ejmech.2019.111865] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 10/08/2019] [Accepted: 11/06/2019] [Indexed: 11/25/2022]
Abstract
We here report the discovery of isoquinoline-based biaryls as a new scaffold for colchicine domain tubulin inhibitors. Colchicinoid inhibitors offer highly desirable cytotoxic and vascular disrupting bioactivities, but their further development requires improving in vivo robustness and tolerability: properties that both depend on the scaffold structure employed. We have developed isoquinoline-based biaryls as a novel scaffold for high-potency tubulin inhibitors, with excellent robustness, druglikeness, and facile late-stage structural diversification, accessible through a tolerant synthetic route. We confirmed their bioactivity mechanism in vitro, developed soluble prodrugs, and established safe in vivo dosing in mice. By addressing several problems facing the current families of inhibitors, we expect that this new scaffold will find a range of in vivo applications towards translational use in cancer therapy.
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Affiliation(s)
- Yvonne Kraus
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University of Munich, Butenandtstrasse 5-13, Munich, 81377, Germany
| | - Carina Glas
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University of Munich, Butenandtstrasse 5-13, Munich, 81377, Germany
| | - Benedikt Melzer
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University of Munich, Butenandtstrasse 5-13, Munich, 81377, Germany
| | - Li Gao
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University of Munich, Butenandtstrasse 5-13, Munich, 81377, Germany
| | - Constanze Heise
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University of Munich, Butenandtstrasse 5-13, Munich, 81377, Germany
| | - Monique Preuße
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University of Munich, Butenandtstrasse 5-13, Munich, 81377, Germany
| | - Julia Ahlfeld
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University of Munich, Butenandtstrasse 5-13, Munich, 81377, Germany
| | - Franz Bracher
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University of Munich, Butenandtstrasse 5-13, Munich, 81377, Germany
| | - Oliver Thorn-Seshold
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University of Munich, Butenandtstrasse 5-13, Munich, 81377, Germany.
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40
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Trads JB, Hüll K, Matsuura BS, Laprell L, Fehrentz T, Görldt N, Kozek KA, Weaver CD, Klöcker N, Barber DM, Trauner D. Sign Inversion in Photopharmacology: Incorporation of Cyclic Azobenzenes in Photoswitchable Potassium Channel Blockers and Openers. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201905790] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Julie B. Trads
- Department of Chemistry and Center for Integrated Protein Science (CIPSM) Ludwig Maximilian University Munich Butenandtstr. 5–13 81377 Munich Germany
- Center for DNA Nanotechnology Department of Chemistry and iNANO Aarhus University Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Katharina Hüll
- Department of Chemistry and Center for Integrated Protein Science (CIPSM) Ludwig Maximilian University Munich Butenandtstr. 5–13 81377 Munich Germany
- Department of Chemistry New York University 100 Washington Square East New York NY 10003-6699 USA
| | - Bryan S. Matsuura
- Department of Chemistry and Center for Integrated Protein Science (CIPSM) Ludwig Maximilian University Munich Butenandtstr. 5–13 81377 Munich Germany
- Department of Chemistry New York University 100 Washington Square East New York NY 10003-6699 USA
| | - Laura Laprell
- Department of Chemistry and Center for Integrated Protein Science (CIPSM) Ludwig Maximilian University Munich Butenandtstr. 5–13 81377 Munich Germany
| | - Timm Fehrentz
- Institute of Neural and Sensory Physiology, Medical Faculty University of Düsseldorf Düsseldorf Germany
| | - Nicole Görldt
- Institute of Neural and Sensory Physiology, Medical Faculty University of Düsseldorf Düsseldorf Germany
| | - Krystian A. Kozek
- Department of Pharmacology Vanderbilt University School of Medicine Nashville TN USA
| | - C. David Weaver
- Departments of Pharmacology and Chemistry Institute of Chemical Biology Vanderbilt University School of Medicine Nashville TN USA
| | - Nikolaj Klöcker
- Institute of Neural and Sensory Physiology, Medical Faculty University of Düsseldorf Düsseldorf Germany
| | - David M. Barber
- Department of Chemistry and Center for Integrated Protein Science (CIPSM) Ludwig Maximilian University Munich Butenandtstr. 5–13 81377 Munich Germany
| | - Dirk Trauner
- Department of Chemistry and Center for Integrated Protein Science (CIPSM) Ludwig Maximilian University Munich Butenandtstr. 5–13 81377 Munich Germany
- Department of Chemistry New York University 100 Washington Square East New York NY 10003-6699 USA
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Trads JB, Hüll K, Matsuura BS, Laprell L, Fehrentz T, Görldt N, Kozek KA, Weaver CD, Klöcker N, Barber DM, Trauner D. Sign Inversion in Photopharmacology: Incorporation of Cyclic Azobenzenes in Photoswitchable Potassium Channel Blockers and Openers. Angew Chem Int Ed Engl 2019; 58:15421-15428. [PMID: 31441199 DOI: 10.1002/anie.201905790] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 07/30/2019] [Indexed: 01/22/2023]
Abstract
Photopharmacology relies on ligands that change their pharmacodynamics upon photoisomerization. Many of these ligands are azobenzenes that are thermodynamically more stable in their elongated trans-configuration. Often, they are biologically active in this form and lose activity upon irradiation and photoisomerization to their cis-isomer. Recently, cyclic azobenzenes, so-called diazocines, have emerged, which are thermodynamically more stable in their bent cis-form. Incorporation of these switches into a variety of photopharmaceuticals could convert dark-active ligands into dark-inactive ligands, which is preferred in most biological applications. This "pharmacological sign-inversion" is demonstrated for a photochromic blocker of voltage-gated potassium channels, termed CAL, and a photochromic opener of G protein-coupled inwardly rectifying potassium (GIRK) channels, termed CLOGO.
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Affiliation(s)
- Julie B Trads
- Department of Chemistry and Center for Integrated Protein Science (CIPSM), Ludwig Maximilian University Munich, Butenandtstr. 5-13, 81377, Munich, Germany.,Center for DNA Nanotechnology, Department of Chemistry and iNANO, Aarhus University, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark
| | - Katharina Hüll
- Department of Chemistry and Center for Integrated Protein Science (CIPSM), Ludwig Maximilian University Munich, Butenandtstr. 5-13, 81377, Munich, Germany.,Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003-6699, USA
| | - Bryan S Matsuura
- Department of Chemistry and Center for Integrated Protein Science (CIPSM), Ludwig Maximilian University Munich, Butenandtstr. 5-13, 81377, Munich, Germany.,Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003-6699, USA
| | - Laura Laprell
- Department of Chemistry and Center for Integrated Protein Science (CIPSM), Ludwig Maximilian University Munich, Butenandtstr. 5-13, 81377, Munich, Germany
| | - Timm Fehrentz
- Institute of Neural and Sensory Physiology, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany
| | - Nicole Görldt
- Institute of Neural and Sensory Physiology, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany
| | - Krystian A Kozek
- Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - C David Weaver
- Departments of Pharmacology and Chemistry, Institute of Chemical Biology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Nikolaj Klöcker
- Institute of Neural and Sensory Physiology, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany
| | - David M Barber
- Department of Chemistry and Center for Integrated Protein Science (CIPSM), Ludwig Maximilian University Munich, Butenandtstr. 5-13, 81377, Munich, Germany
| | - Dirk Trauner
- Department of Chemistry and Center for Integrated Protein Science (CIPSM), Ludwig Maximilian University Munich, Butenandtstr. 5-13, 81377, Munich, Germany.,Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003-6699, USA
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Iminothioindoxyl as a molecular photoswitch with 100 nm band separation in the visible range. Nat Commun 2019; 10:2390. [PMID: 31160552 PMCID: PMC6546742 DOI: 10.1038/s41467-019-10251-8] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 04/25/2019] [Indexed: 12/16/2022] Open
Abstract
Light is an exceptional external stimulus for establishing precise control over the properties and functions of chemical and biological systems, which is enabled through the use of molecular photoswitches. Ideal photoswitches are operated with visible light only, show large separation of absorption bands and are functional in various solvents including water, posing an unmet challenge. Here we show a class of fully-visible-light-operated molecular photoswitches, Iminothioindoxyls (ITIs) that meet these requirements. ITIs show a band separation of over 100 nm, isomerize on picosecond time scale and thermally relax on millisecond time scale. Using a combination of advanced spectroscopic and computational techniques, we provide the rationale for the switching behavior of ITIs and the influence of structural modifications and environment, including aqueous solution, on their photochemical properties. This research paves the way for the development of improved photo-controlled systems for a wide variety of applications that require fast responsive functions. The design of photoswitches which operate in the visible light regime, show a large separation of absorption bands and are functional in various solvents is challenging. Here the authors report Iminothioindoxyls as visible-light operated photoswitches with a band separation of 100 nm.
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Hoffmann K, Guentner M, Mayer P, Dube H. Symmetric and nonsymmetric bis-hemithioindigos – precise visible light controlled shape-shifters. Org Chem Front 2019. [DOI: 10.1039/c9qo00202b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A series of bis-hemithioindigo photoswitches with different molecular setups are presented allowing precise manipulation of molecular shapes with visible light.
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Affiliation(s)
- Kerstin Hoffmann
- The Faculty for Chemistry and Pharmacy
- Ludwig-Maximilians-University
- Munich
- Germany
| | - Manuel Guentner
- The Faculty for Chemistry and Pharmacy
- Ludwig-Maximilians-University
- Munich
- Germany
| | - Peter Mayer
- The Faculty for Chemistry and Pharmacy
- Ludwig-Maximilians-University
- Munich
- Germany
| | - Henry Dube
- The Faculty for Chemistry and Pharmacy
- Ludwig-Maximilians-University
- Munich
- Germany
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