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We are analyzing https://link.springer.com/article/10.1007/pl00005131.

Title:
Comparative pharmacology of human adenosine receptor subtypes – characterization of stably transfected receptors in CHO cells | Naunyn-Schmiedeberg's Archives of Pharmacology
Description:
Four adenosine receptor subtypes of the family of G protein-coupled receptors, designated A1, A2A, A2B and A3 are currently known. In this study all human subtypes were stably transfected into Chinese hamster ovary (CHO) cells in order to be able to study their pharmacological profile in an identical cellular background utilizing radioligand binding studies (A1, A2A, A3) or adenylyl cyclase activity assays (A2B). The A1 subtype showed the typical pharmacological profile with 2-chloro-N6-cyclopentyladenosine (CCPA) as the agonist with the highest affinity and a marked stereoselectivity for the N6-phenylisopropyladenosine (PIA) diastereomers. In competition with antagonist radioligand biphasic curves were observed for agonists. In the presence of GTP all receptors were converted to a single low affinity state indicating functional coupling to endogenous G proteins. For A2A adenosine receptors CGS 21680 (2-[p-(2-carboxyethyl)phenylethylamino]-5′-N-ethylcarboxamidoadenosine) and N-ethylcarboxamidoadenosine (NECA) were found to be the most potent agonists followed by R- and S-PIA with minor stereoselectivity. The relative potencies of agonists for the A2B adenosine receptor could only be tested by measurement of receptor-stimulated adenylyl cyclase activity. NECA was the most potent agonist with an EC50-value of 2.3 μM whereas all other compounds tested were active at concentrations in the high micromolar range. Inhibition of NECA-stimulated adenylyl cyclase identified xanthine amino congener (XAC; 8-[4-[[[[(2-aminoethyl)amino]carbonyl]methyl]oxy]phenyl]-1,3-dipropylxanthine) as the most potent antagonist at this receptor subtype. The A3 receptor was characterized utilizing the nonselective agonist [3H]NECA. The N6-benzyl substituted derivatives of adenosine-5′-N-methyluronamide (MECA) turned out to be the most potent agonists. The notion of xanthine-insensitivity of the A3 receptor should be dropped at least for the human receptor as xanthines with submicromolar affinity were found. Overall, the pharmacological characteristics of the human receptors are similar to other species with some species-specific characteristics. In this study we present for the first time the comparative pharmacology of all known human adenosine receptor subtypes. The CHO cells with stably transfected adenosine receptors provide an identical cellular background for such a pharmacological characterization. These cells are valuable systems for further characterization of specific receptor subtypes and for the development of new ligands.
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Keywords {🔍}

receptors, adenosine, article, receptor, pharmacology, human, subtypes, privacy, cookies, content, cells, information, publish, research, search, characterization, stably, transfected, cho, pharmacological, agonists, potent, access, data, log, journal, naunynschmiedebergs, comparative, klotz, hessling, hegler, proteincoupled, study, adenylyl, cyclase, agonist, affinity, discover, springer, optional, personal, parties, policy, find, track, archives, cite, owman, kull, fredholm,

Topics {✒️}

protein-coupled receptors amino]carbonyl]methyl]oxy]phenyl]-1 month download article/chapter n6-benzyl substituted derivatives identical cellular background nonselective agonist [3h]neca related subjects peripheral adenosine receptors stably transfected receptors a2b adenosine receptor adenosine receptor subtypes privacy choices/manage cookies article naunyn-schmiedeberg' medical cell research specific receptor subtypes full article pdf a1 subtype showed adenosine receptors human receptors adenosine-5′-n-methyluronamide european economic area scope submit manuscript chinese hamster ovary 2-chloro-n6-cyclopentyladenosine high micromolar range hippocampal synaptic transmission equilibrative nucleoside transporters conditions privacy policy phenylethylamino]-5′-n-ethylcarboxamidoadenosine accepting optional cookies a3 receptor check access instant access typical pharmacological profile main content log human receptor species-specific characteristics journal finder publish naunyn-schmiedeberg' human subtypes xanthine-insensitivity comparative pharmacology designated a1 receptor subtype stably transfected characterized utilizing pharmacology aims receptors article log privacy policy

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         headline:Comparative pharmacology of human adenosine receptor subtypes – characterization of stably transfected receptors in CHO cells
         description: Four adenosine receptor subtypes of the family of G protein-coupled receptors, designated A1, A2A, A2B and A3 are currently known. In this study all human subtypes were stably transfected into Chinese hamster ovary (CHO) cells in order to be able to study their pharmacological profile in an identical cellular background utilizing radioligand binding studies (A1, A2A, A3) or adenylyl cyclase activity assays (A2B). The A1 subtype showed the typical pharmacological profile with 2-chloro-N6-cyclopentyladenosine (CCPA) as the agonist with the highest affinity and a marked stereoselectivity for the N6-phenylisopropyladenosine (PIA) diastereomers. In competition with antagonist radioligand biphasic curves were observed for agonists. In the presence of GTP all receptors were converted to a single low affinity state indicating functional coupling to endogenous G proteins. For A2A adenosine receptors CGS 21680 (2-[p-(2-carboxyethyl)phenylethylamino]-5′-N-ethylcarboxamidoadenosine) and N-ethylcarboxamidoadenosine (NECA) were found to be the most potent agonists followed by R- and S-PIA with minor stereoselectivity. The relative potencies of agonists for the A2B adenosine receptor could only be tested by measurement of receptor-stimulated adenylyl cyclase activity. NECA was the most potent agonist with an EC50-value of 2.3 μM whereas all other compounds tested were active at concentrations in the high micromolar range. Inhibition of NECA-stimulated adenylyl cyclase identified xanthine amino congener (XAC; 8-[4-[[[[(2-aminoethyl)amino]carbonyl]methyl]oxy]phenyl]-1,3-dipropylxanthine) as the most potent antagonist at this receptor subtype. The A3 receptor was characterized utilizing the nonselective agonist [3H]NECA. The N6-benzyl substituted derivatives of adenosine-5′-N-methyluronamide (MECA) turned out to be the most potent agonists. The notion of xanthine-insensitivity of the A3 receptor should be dropped at least for the human receptor as xanthines with submicromolar affinity were found. Overall, the pharmacological characteristics of the human receptors are similar to other species with some species-specific characteristics. In this study we present for the first time the comparative pharmacology of all known human adenosine receptor subtypes. The CHO cells with stably transfected adenosine receptors provide an identical cellular background for such a pharmacological characterization. These cells are valuable systems for further characterization of specific receptor subtypes and for the development of new ligands.
         datePublished:
         dateModified:
         pageStart:1
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         sameAs:https://doi.org/10.1007/PL00005131
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            Key words Adenosine receptors
            G protein-coupled
            receptors
            Stable transfection
            Signal transduction
            A1
            A2A
            A2B
            A3
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                     address:
                        name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany, , DE
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                     address:
                        name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany, , DE
                        type:PostalAddress
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               name:C. Owman
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                        type:PostalAddress
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               name:B. Kull
               affiliation:
                     name:Department of Physiology and Pharmacology, Karolinska Institute, S-17177 Stockholm, Sweden
                     address:
                        name:Department of Physiology and Pharmacology, Karolinska Institute, S-17177 Stockholm, Sweden, , SE
                        type:PostalAddress
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               name:B. B. Fredholm
               affiliation:
                     name:Department of Physiology and Pharmacology, Karolinska Institute, S-17177 Stockholm, Sweden
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                        name:Department of Physiology and Pharmacology, Karolinska Institute, S-17177 Stockholm, Sweden, , SE
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      headline:Comparative pharmacology of human adenosine receptor subtypes – characterization of stably transfected receptors in CHO cells
      description: Four adenosine receptor subtypes of the family of G protein-coupled receptors, designated A1, A2A, A2B and A3 are currently known. In this study all human subtypes were stably transfected into Chinese hamster ovary (CHO) cells in order to be able to study their pharmacological profile in an identical cellular background utilizing radioligand binding studies (A1, A2A, A3) or adenylyl cyclase activity assays (A2B). The A1 subtype showed the typical pharmacological profile with 2-chloro-N6-cyclopentyladenosine (CCPA) as the agonist with the highest affinity and a marked stereoselectivity for the N6-phenylisopropyladenosine (PIA) diastereomers. In competition with antagonist radioligand biphasic curves were observed for agonists. In the presence of GTP all receptors were converted to a single low affinity state indicating functional coupling to endogenous G proteins. For A2A adenosine receptors CGS 21680 (2-[p-(2-carboxyethyl)phenylethylamino]-5′-N-ethylcarboxamidoadenosine) and N-ethylcarboxamidoadenosine (NECA) were found to be the most potent agonists followed by R- and S-PIA with minor stereoselectivity. The relative potencies of agonists for the A2B adenosine receptor could only be tested by measurement of receptor-stimulated adenylyl cyclase activity. NECA was the most potent agonist with an EC50-value of 2.3 μM whereas all other compounds tested were active at concentrations in the high micromolar range. Inhibition of NECA-stimulated adenylyl cyclase identified xanthine amino congener (XAC; 8-[4-[[[[(2-aminoethyl)amino]carbonyl]methyl]oxy]phenyl]-1,3-dipropylxanthine) as the most potent antagonist at this receptor subtype. The A3 receptor was characterized utilizing the nonselective agonist [3H]NECA. The N6-benzyl substituted derivatives of adenosine-5′-N-methyluronamide (MECA) turned out to be the most potent agonists. The notion of xanthine-insensitivity of the A3 receptor should be dropped at least for the human receptor as xanthines with submicromolar affinity were found. Overall, the pharmacological characteristics of the human receptors are similar to other species with some species-specific characteristics. In this study we present for the first time the comparative pharmacology of all known human adenosine receptor subtypes. The CHO cells with stably transfected adenosine receptors provide an identical cellular background for such a pharmacological characterization. These cells are valuable systems for further characterization of specific receptor subtypes and for the development of new ligands.
      datePublished:
      dateModified:
      pageStart:1
      pageEnd:9
      sameAs:https://doi.org/10.1007/PL00005131
      keywords:
         Key words Adenosine receptors
         G protein-coupled
         receptors
         Stable transfection
         Signal transduction
         A1
         A2A
         A2B
         A3
         ligand
         Pharmacology/Toxicology
         Neurosciences
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                     name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany, , DE
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                  address:
                     name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany, , DE
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            name:J. Hegler
            affiliation:
                  name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany
                  address:
                     name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany, , DE
                     type:PostalAddress
                  type:Organization
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            name:C. Owman
            affiliation:
                  name:Department of Medical Cell Research, University of Lund, S-22362 Lund, Sweden
                  address:
                     name:Department of Medical Cell Research, University of Lund, S-22362 Lund, Sweden, , SE
                     type:PostalAddress
                  type:Organization
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            name:B. Kull
            affiliation:
                  name:Department of Physiology and Pharmacology, Karolinska Institute, S-17177 Stockholm, Sweden
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                     name:Department of Physiology and Pharmacology, Karolinska Institute, S-17177 Stockholm, Sweden, , SE
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                     name:Department of Physiology and Pharmacology, Karolinska Institute, S-17177 Stockholm, Sweden, , SE
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               name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany, , DE
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               name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany, , DE
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      affiliation:
            name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany
            address:
               name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany, , DE
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            name:Department of Medical Cell Research, University of Lund, S-22362 Lund, Sweden
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               name:Department of Medical Cell Research, University of Lund, S-22362 Lund, Sweden, , SE
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            name:Department of Physiology and Pharmacology, Karolinska Institute, S-17177 Stockholm, Sweden
            address:
               name:Department of Physiology and Pharmacology, Karolinska Institute, S-17177 Stockholm, Sweden, , SE
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            address:
               name:Department of Physiology and Pharmacology, Karolinska Institute, S-17177 Stockholm, Sweden, , SE
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            name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany
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               name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany, , DE
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      name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany, , DE
      name:Department of Medical Cell Research, University of Lund, S-22362 Lund, Sweden, , SE
      name:Department of Physiology and Pharmacology, Karolinska Institute, S-17177 Stockholm, Sweden, , SE
      name:Department of Physiology and Pharmacology, Karolinska Institute, S-17177 Stockholm, Sweden, , SE
      name:Institut für Pharmakologie und Toxikologie, Universität Würzburg, Versbacher Strasse 9, D-97078 Würzburg, Germany, , DE
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