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The chronological evolution of fluorescent GPCR probes for bioimaging. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2023.215040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Giakomidi D, Bird MF, Guerrini R, Calo G, Lambert DG. Fluorescent opioid receptor ligands as tools to study opioid receptor function. J Pharmacol Toxicol Methods 2021; 113:107132. [PMID: 34728348 DOI: 10.1016/j.vascn.2021.107132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 10/12/2021] [Accepted: 10/25/2021] [Indexed: 11/30/2022]
Abstract
Opioid receptors are divided into the three classical types: MOP(μ:mu), DOP(δ:delta) and KOP(κ:kappa) that are naloxone-sensitive and an additional naloxone-insensitive nociceptin/orphanin FQ(N/OFQ) peptide receptor(NOP). Studies to determine opioid receptor location and turnover variably rely on; (i) measuring receptor mRNA, (ii) genetically tagging receptors, (iii) labelling receptors with radioligands, (iv) use of antibodies in immunohistochemistry/Western Blotting or (v) measuring receptor function coupled with the use of selective antagonists. All have their drawbacks with significant issues relating to mRNA not necessarily predicting protein, poor antibody selectivity and utility of radiolabels in low expression systems. In this minireview we discuss use of fluorescently labelled opioid receptor ligands. To maintain the pharmacological properties of the corresponding parent ligand fluorescently labelled ligands must take into account fluorophore (brightness and propensity to bleach), linker length and chemistry, and site to which the linker (and hence probe) will be attached. Use of donor and acceptor fluorophores with spectral overlap facilitates use in FRET type assays to determine proximity of ligand or tagged receptor pairs. There is a wide range of probes of agonist and antagonist nature for all four opioid receptor types; caution is needed with agonist probes due to the possibility for internalization. We have produced two novel ATTO based probes; DermorphinATTO488 (MOP) and N/OFQATTO594 (NOP). These probes label MOP and NOP in a range of preparations and using N/OFQATTO594 we demonstrate internalization and ligand-receptor interaction by FRET. Fluorescent opioid probes offer potential methodological advantages over more traditional use of antibodies and radiolabels.
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Affiliation(s)
- Despina Giakomidi
- Department of Cardiovascular Sciences (Anaesthesia, Critical Care and Pain Management), University of Leicester, Hodgkin Building, Leicester LE1 9HN. UK
| | - Mark F Bird
- Department of Cardiovascular Sciences (Anaesthesia, Critical Care and Pain Management), University of Leicester, Hodgkin Building, Leicester LE1 9HN. UK
| | - Remo Guerrini
- Department of Chemical, Pharmaceutical and Agricultural Sciences and LTTA, University of Ferrara, Italy
| | - Girolamo Calo
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, 35131 Padova, Italy
| | - David G Lambert
- Department of Cardiovascular Sciences (Anaesthesia, Critical Care and Pain Management), University of Leicester, Hodgkin Building, Leicester LE1 9HN. UK.
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3
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Drakopoulos A, Decker M. Development and Biological Applications of Fluorescent Opioid Ligands. Chempluschem 2020; 85:1354-1364. [DOI: 10.1002/cplu.202000212] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 05/30/2020] [Indexed: 12/24/2022]
Affiliation(s)
- Antonios Drakopoulos
- Pharmaceutical and Medicinal ChemistryInstitute of Pharmacy and Food ChemistryJulius Maximilian University of Würzburg 97074 Würzburg Germany
| | - Michael Decker
- Pharmaceutical and Medicinal ChemistryInstitute of Pharmacy and Food ChemistryJulius Maximilian University of Würzburg 97074 Würzburg Germany
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Schembri LS, Stoddart LA, Briddon SJ, Kellam B, Canals M, Graham B, Scammells PJ. Synthesis, Biological Evaluation, and Utility of Fluorescent Ligands Targeting the μ-Opioid Receptor. J Med Chem 2015; 58:9754-67. [DOI: 10.1021/acs.jmedchem.5b01664] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
| | - Leigh A. Stoddart
- Cell
Signaling Research Group, School of Life Sciences, Queen’s
Medical Centre, University of Nottingham, Nottingham NG7 2UH, U.K
| | - Stephen J. Briddon
- Cell
Signaling Research Group, School of Life Sciences, Queen’s
Medical Centre, University of Nottingham, Nottingham NG7 2UH, U.K
| | - Barrie Kellam
- School
of Pharmacy, Centre for Biomolecular Sciences, University of Nottingham, Nottingham NG7 2RD, U.K
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Chang AC, Chao CC, Takemori AE, Gekker G, Hu S, Peterson PK, Portoghese PS. Arylacetamide-derived fluorescent probes: synthesis, biological evaluation, and direct fluorescent labeling of kappa opioid receptors in mouse microglial cells. J Med Chem 1996; 39:1729-35. [PMID: 8648612 DOI: 10.1021/jm950813b] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Fluorescein isothiocyanate isomer I (FITC-I) conjugates of 2-(3,4-dichlorophenyl)-N-methyl-N-[1-(3- or 4-aminophenyl)-2-(1-pyrrolidinyl)ethyl]acetamide (10 and 14) were prepared either without or with an intervening mono-, di-, or tetraglycyl linker. The 3-substituted fluorescent probes (2-5) were found to retain potent agonist activity in smooth muscle preparations as well as high kappa receptor affinity and selectivity in receptor binding assays. The 4-substituted series (6-9) were substantially less potent than the corresponding 3-substituted compounds. Flow cytometric analysis demonstrated high levels of direct kappa-specific staining of mouse microglial cells by the fluorescent probe 5 containing a tetraglycyl linker, as indicated by a 41% decrease in percent cells positively labeled and a 61% decrease in mean fluorescence intensity in the presence of the kappa-selective antagonist, norbinaltorphimine (norBNI). In similar studies, the probe 2 without a linker exhibited only nonspecific binding. This is the first report of direct, selective staining of kappa opioid receptors by a fluorescent nonpeptide opioid ligand. The results of the present study illustrate the importance of introducing hydrophilic linkers to reduce nonspecific binding of fluorescent probes for opioid receptors.
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Affiliation(s)
- A C Chang
- Department of Medicinal Chemistry, College of Pharmacy, University of Minnesota, Minneapolis, 55455, USA
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Baindur N, Triggle DJ. Concepts and progress in the development and utilization of receptor-specific fluorescent ligands. Med Res Rev 1994; 14:591-664. [PMID: 7530311 DOI: 10.1002/med.2610140603] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- N Baindur
- School of Pharmacy, State University of New York at Buffalo 14260
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Abstract
The antinociceptive potency of linear and cyclic beta-casomorphin-5 (CM-5) analogues, modified in position 1 by substitution of the tyrosine (Tyr) by the phenylalanine (Phe) residue, was studied using the vocalization test. With the exception of the linear [Phe1,D-Orn2]CM-5, the Phe1-substituted linear and cyclic casomorphin analogues exhibit remarkable analgesic potency compared to morphine, although the opioid receptor affinity and the opioid activity in vitro is diminished compared to the corresponding Tyr-containing analogues. The analgesic effect of the compounds is mediated by activation of opioid receptors, because it can be antagonized with naloxone. Furthermore, it was demonstrated that the [Phe1,D-Orn2,D-Pro4]CM-5, which was about sixfold more potent than morphine, developed cross-tolerance to morphine.
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Affiliation(s)
- H L Rüthrich
- Institute of Pharmacology and Toxicology, Otto von Guericke University, Magdeburg, Germany
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9
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Archer S, Medzihradsky F, Seyed-Mozaffari A, Emmerson PJ. Synthesis and characterization of 7-nitrobenzo-2-oxa-1,3-diazole (NBD)-labeled fluorescent opioids. Biochem Pharmacol 1992; 43:301-6. [PMID: 1371213 DOI: 10.1016/0006-2952(92)90292-q] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Alkylation of sarcosine with 4-chloro-nitrobenzo-2-oxa-1,3-diazole (NBD-chloride) furnished a fluorescent tag that was coupled with a tetrahydrothebaine derivative and beta-naltrexamine, respectively, to yield the fluorescent opioids 7 alpha-(1R)-1-hydroxy-1-methyl-3-(4-hydroxyphenyl)-propyl]-6,14- endoethenotetrahydrothebaine NBD-sarcosinate (ASM-5-10) and N-cyclopropylmethyl-3-hydroxy-14 beta-hydroxy-6 beta-(NBD sarcosinyl)-amino-epoxymorphinan (ASM-5-67). The fluorescence intensity of the novel opioids allowed their detection at subnanomolar concentrations, and was dependent on the polarity of the solvent. Maximum quantum yield was obtained in ethyl acetate and ethanol, and minimal fluorescence in heptane and water. Compounds ASM-5-10 and ASM-5-67 displaced the opioid receptor binding of [3H]Tyr-D-Ala-Gly-(Me)Phe-Gly-ol in monkey brain membranes with IC50 values of 8.4 and 1.5 nM, respectively. Whereas ASM-5-67 bound to mu, delta, and kappa receptors with comparable affinities, ASM-5-10 was mu-selective, with selectivity indices (ratio of respective IC50 values) of 0.04 for both mu/delta and mu/kappa. The sodium response ratio in binding revealed a pronounced agonist property of ASM-5-10. Both opioids were lipophilic, with octanol-water partition coefficients (log Papp) of 2.8 (ASM-5-10) and 1.0 (ASM-5-67). ASM-5-10 exhibited particularly strong membrane retention that was not reversible by four washes. Their favorable characteristics in fluorescence, receptor binding, and membrane interaction make these newly developed ligands useful molecular probes to study opioid receptor mechanisms.
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Affiliation(s)
- S Archer
- Department of Chemistry, Cogswell Laboratory, Rensselaer Polytechnic Institute, Troy, NY 12181
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Nakamura H, Lee S, Ono S, Kato T, Aoyagi H. Side reaction of pyrenylalanine-peptides containing NG-tosylarginine during detosylation with hydrogen fluoride. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1990; 36:471-5. [PMID: 2276875 DOI: 10.1111/j.1399-3011.1990.tb01308.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Formation of by-products of pyrenylalanine-peptides was observed during the cleavage of a tosyl group in pyrenylalanine-peptides containing an Arg(Tos) residue with HF. NMR and fluorescence experiments showed that by-products were compounds in which a pyrenyl group was modified with a tosyl group(s). The side reaction was little suppressed by the addition of usual scavengers such as anisole, 1,2-ethanedithiol, thioanisole and p-cresol. Under the conditions used for the cleavage of N alpha-Boc group, i.e., trifluoroacetic acid or 4 M HCl in dioxane, the pyrenylalanine residue was stable. No side reaction was, furthermore, observed in the reductive cleavage with sodium in liquid ammonia. These results suggest that the side reaction may be due to an electrophilic attack of tosyl cations to the electron-rich pyrenyl group in the pyrenylalanine residue under the HF-mediated acidic conditions.
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Affiliation(s)
- H Nakamura
- Department of Chemistry, Faculty of Science, Kyushu University, Fukuoka, Japan
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Lee S, Yoshida M, Mihara H, Aoyagi H, Kato T, Yamasaki N. The spectroscopic analysis for binding of amphipathic and antimicrobial model peptides containing pyrenylalanine and tryptophan to lipid bilayer. BIOCHIMICA ET BIOPHYSICA ACTA 1989; 984:174-82. [PMID: 2765546 DOI: 10.1016/0005-2736(89)90213-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The binding of basic amphipathic fluorescent peptides to lipid bilayers was studied in relation to their antimicrobial activity. Four fluorescent peptides containing pyrenylalanine or tryptophan in an amphipathic basic peptide (4(4] consisting of four repeated units of tetrapeptide, -L-Leu-L-Ala-L-Arg-L-Leu-, were found to have antimicrobial activities against Gram-positive bacteria and to take conformations with fairly high alpha-helical content both in aqueous solutions and liposomes. The fluorescence spectroscopic data suggested that the pyrenylalanine-peptide existed as a monomer in methanol or liposomes but as an oligomer in aqueous solutions to form an excimer between pyrenylalanyl residues. Upon binding with liposomes, the fluorescence spectra of the tryptophan-containing peptide shifted to a shorter wavelength, indicating the change in the state of tryptophan from hydrophilic environment to hydrophobic one. The analytical data for the quenching of tryptophan fluorescence by I- anion suggest that the tryptophan residue in the peptide is not deeply buried in the hydrophobic core of the bilayers. Based on these findings, it is suggested that the peptides may interact with liposomes in such a manner that they lie parallel to the surface of the lipid bilayers with their hydrophobic regions shallowly in the amphipathic moiety of the bilayers.
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Affiliation(s)
- S Lee
- Laboratory of Biochemistry, Faculty of Science, Kyushu University, Fukuoka, Japan
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Mihara H, Lee S, Shimohigashi Y, Aoyagi H, Kato T, Izumiya N, Costa T. Synthesis, receptor binding activity and fluorescence property of fluorescent enkephalin analogs containing L-1-pyrenylalanine. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1987; 30:605-12. [PMID: 2830198 DOI: 10.1111/j.1399-3011.1987.tb03371.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The novel fluorescent amino acid, L-1-pyrenylalanine (L-Pya), was prepared by the asymmetric hydrogenation of cyclic dehydrodipeptide. Fluorescent enkephalins containing one or two Pya residues at position 1,4 or 5 of [D-Ala2, Leu5]enkephalin were synthesized by the solution method. Mono-Pya-enkephalins showed strong fluorescence intensities and potent binding affinities with specificity and selectivity for opiate receptors. However, di-Pya-enkephalins showed markedly decreased receptor binding affinities. These results indicate that the incorporation of two Pya residues into enkephalin makes the peptide unable to interact with the opiate receptors, although introduction of one Pya residue is effective to elicit a specific receptor interaction. Di-Pya-enkephalins showed intramolecular excimer spectra, indicating that the peptides are able to take possible folded conformations.
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Affiliation(s)
- H Mihara
- Laboratory of Biochemistry, Faculty of Science, Kyushu University, Fukuoka, Japan
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