(S)-2-Amino-3-(3-hydroxy-7,8-dihydro-6H-cyclohepta[d]isoxazol-4-yl)propionic acid, a potent and selective agonist at the GluR5 subtype of ionotropic glutamate receptors. Synthesis, modeling, and molecular pharmacology

Lotte Brehm; Jeremy R Greenwood; Kasper B Hansen; Birgitte Nielsen; Jan Egebjerg; Tine B Stensbøl; Hans Bräuner-Osborne; Frank A Sløk; Tine T A Kronborg; Povl Krogsgaard-Larsen

doi:10.1021/jm0204441

(S)-2-Amino-3-(3-hydroxy-7,8-dihydro-6H-cyclohepta[d]isoxazol-4-yl)propionic acid, a potent and selective agonist at the GluR5 subtype of ionotropic glutamate receptors. Synthesis, modeling, and molecular pharmacology

Lotte Brehm, Jeremy R Greenwood, Kasper B Hansen, Birgitte Nielsen, Jan Egebjerg, Tine B Stensbøl, Hans Bräuner-Osborne, Frank A Sløk, Tine T A Kronborg, Povl Krogsgaard-Larsen

23 Citationer (Scopus)

Abstract

We have previously described (RS)-2-amino-3-(3-hydroxy-7,8-dihydro-6H-cyclohepta[d]isoxazol-4-yl)propionic acid (4-AHCP) as a highly effective agonist at non-N-methyl-d-aspartate (non-NMDA) glutamate (Glu) receptors in vivo, which is more potent than (RS)-2-amino-3-(3-hydroxy-5-methylisoxazol-4-yl)propionic acid (AMPA) but inactive at NMDA receptors. However, 4-AHCP was found to be much weaker than AMPA as an inhibitor of [(3)H]AMPA binding and to have limited effect in a [(3)H]kainic acid binding assay using rat cortical membranes. To shed light on the mechanism(s) underlying this quite enigmatic pharmacological profile of 4-AHCP, we have now developed a synthesis of (S)-4-AHCP (6) and (R)-4-AHCP (7). At cloned metabotropic Glu receptors mGluR1alpha (group I), mGluR2 (group II), and mGluR4a (group III), neither 6 nor 7 showed significant agonist or antagonist effects. The stereoisomer 6, but not 7, activated cloned AMPA receptor subunits GluR1o, GluR3o, and GluR4o with EC(50) values in the range 4.5-15 microM and the coexpressed kainate-preferring subunits GluR6 + KA2 (EC(50) = 6.4 microM). Compound 6, but not 7, proved to be a very potent agonist (EC(50) = 0.13 microM) at the kainate-preferring GluR5 subunit, equipotent with (S)-2-amino-3-(5-tert-butyl-3-hydroxyisothiazol-4-yl)propionic acid [(S)-Thio-ATPA, 4] and almost 4 times more potent than (S)-2-amino-3-(5-tert-butyl-3-hydroxyisoxazol-4-yl)propionic acid [(S)-ATPA, 3]. Compound 6 thus represents a new structural class of GluR5 agonists. Molecular modeling and docking to a crystal structure of the extracellular binding domain of the AMPA subunit GluR2 has enabled identification of the probable active conformation and binding mode of 6. We are able to rationalize the observed selectivities by comparing the docking of 4 and 6 to subtype constructs, i.e., a crystal structure of the extracellular binding domain of GluR2 and a homology model of GluR5.

Originalsprog	Engelsk
Tidsskrift	Journal of Medicinal Chemistry
Vol/bind	46
Udgave nummer	8
Sider (fra-til)	1350-8
ISSN	0022-2623
DOI	https://doi.org/10.1021/jm0204441
Status	Udgivet - 10 apr. 2003

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10.1021/jm0204441

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Citationsformater

Brehm, L., Greenwood, J. R., Hansen, K. B., Nielsen, B., Egebjerg, J., Stensbøl, T. B., Bräuner-Osborne, H., Sløk, F. A., Kronborg, T. T. A., & Krogsgaard-Larsen, P. (2003). (S)-2-Amino-3-(3-hydroxy-7,8-dihydro-6H-cyclohepta[d]isoxazol-4-yl)propionic acid, a potent and selective agonist at the GluR5 subtype of ionotropic glutamate receptors. Synthesis, modeling, and molecular pharmacology. Journal of Medicinal Chemistry, 46(8), 1350-8. https://doi.org/10.1021/jm0204441

(S)-2-Amino-3-(3-hydroxy-7,8-dihydro-6H-cyclohepta[d]isoxazol-4-yl)propionic acid, a potent and selective agonist at the GluR5 subtype of ionotropic glutamate receptors. Synthesis, modeling, and molecular pharmacology. / Brehm, Lotte; Greenwood, Jeremy R; Hansen, Kasper B et al.

I: Journal of Medicinal Chemistry, Bind 46, Nr. 8, 10.04.2003, s. 1350-8.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

Brehm, L, Greenwood, JR, Hansen, KB, Nielsen, B, Egebjerg, J, Stensbøl, TB, Bräuner-Osborne, H, Sløk, FA, Kronborg, TTA & Krogsgaard-Larsen, P 2003, '(S)-2-Amino-3-(3-hydroxy-7,8-dihydro-6H-cyclohepta[d]isoxazol-4-yl)propionic acid, a potent and selective agonist at the GluR5 subtype of ionotropic glutamate receptors. Synthesis, modeling, and molecular pharmacology', Journal of Medicinal Chemistry, bind 46, nr. 8, s. 1350-8. https://doi.org/10.1021/jm0204441

Brehm L, Greenwood JR, Hansen KB, Nielsen B, Egebjerg J, Stensbøl TB et al. (S)-2-Amino-3-(3-hydroxy-7,8-dihydro-6H-cyclohepta[d]isoxazol-4-yl)propionic acid, a potent and selective agonist at the GluR5 subtype of ionotropic glutamate receptors. Synthesis, modeling, and molecular pharmacology. Journal of Medicinal Chemistry. 2003 apr. 10;46(8):1350-8. doi: 10.1021/jm0204441

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title = "(S)-2-Amino-3-(3-hydroxy-7,8-dihydro-6H-cyclohepta[d]isoxazol-4-yl)propionic acid, a potent and selective agonist at the GluR5 subtype of ionotropic glutamate receptors. Synthesis, modeling, and molecular pharmacology",

abstract = "We have previously described (RS)-2-amino-3-(3-hydroxy-7,8-dihydro-6H-cyclohepta[d]isoxazol-4-yl)propionic acid (4-AHCP) as a highly effective agonist at non-N-methyl-d-aspartate (non-NMDA) glutamate (Glu) receptors in vivo, which is more potent than (RS)-2-amino-3-(3-hydroxy-5-methylisoxazol-4-yl)propionic acid (AMPA) but inactive at NMDA receptors. However, 4-AHCP was found to be much weaker than AMPA as an inhibitor of [(3)H]AMPA binding and to have limited effect in a [(3)H]kainic acid binding assay using rat cortical membranes. To shed light on the mechanism(s) underlying this quite enigmatic pharmacological profile of 4-AHCP, we have now developed a synthesis of (S)-4-AHCP (6) and (R)-4-AHCP (7). At cloned metabotropic Glu receptors mGluR1alpha (group I), mGluR2 (group II), and mGluR4a (group III), neither 6 nor 7 showed significant agonist or antagonist effects. The stereoisomer 6, but not 7, activated cloned AMPA receptor subunits GluR1o, GluR3o, and GluR4o with EC(50) values in the range 4.5-15 microM and the coexpressed kainate-preferring subunits GluR6 + KA2 (EC(50) = 6.4 microM). Compound 6, but not 7, proved to be a very potent agonist (EC(50) = 0.13 microM) at the kainate-preferring GluR5 subunit, equipotent with (S)-2-amino-3-(5-tert-butyl-3-hydroxyisothiazol-4-yl)propionic acid [(S)-Thio-ATPA, 4] and almost 4 times more potent than (S)-2-amino-3-(5-tert-butyl-3-hydroxyisoxazol-4-yl)propionic acid [(S)-ATPA, 3]. Compound 6 thus represents a new structural class of GluR5 agonists. Molecular modeling and docking to a crystal structure of the extracellular binding domain of the AMPA subunit GluR2 has enabled identification of the probable active conformation and binding mode of 6. We are able to rationalize the observed selectivities by comparing the docking of 4 and 6 to subtype constructs, i.e., a crystal structure of the extracellular binding domain of GluR2 and a homology model of GluR5.",

keywords = "Alanine, Amino Acid Sequence, Animals, CHO Cells, Cricetinae, Excitatory Amino Acid Agonists, Isoxazoles, Ligands, Models, Molecular, Molecular Conformation, Molecular Sequence Data, Monte Carlo Method, Oocytes, Patch-Clamp Techniques, Propionates, Radioligand Assay, Receptors, Kainic Acid, Sequence Homology, Amino Acid, Stereoisomerism, Structure-Activity Relationship, Xenopus laevis",

author = "Lotte Brehm and Greenwood, {Jeremy R} and Hansen, {Kasper B} and Birgitte Nielsen and Jan Egebjerg and Stensb{\o}l, {Tine B} and Hans Br{\"a}uner-Osborne and Sl{\o}k, {Frank A} and Kronborg, {Tine T A} and Povl Krogsgaard-Larsen",

year = "2003",

month = apr,

day = "10",

doi = "10.1021/jm0204441",

language = "English",

volume = "46",

pages = "1350--8",

journal = "Journal of Medicinal Chemistry",

issn = "0022-2623",

publisher = "American Chemical Society",

number = "8",

}

TY - JOUR

T1 - (S)-2-Amino-3-(3-hydroxy-7,8-dihydro-6H-cyclohepta[d]isoxazol-4-yl)propionic acid, a potent and selective agonist at the GluR5 subtype of ionotropic glutamate receptors. Synthesis, modeling, and molecular pharmacology

AU - Brehm, Lotte

AU - Greenwood, Jeremy R

AU - Hansen, Kasper B

AU - Nielsen, Birgitte

AU - Egebjerg, Jan

AU - Stensbøl, Tine B

AU - Bräuner-Osborne, Hans

AU - Sløk, Frank A

AU - Kronborg, Tine T A

AU - Krogsgaard-Larsen, Povl

PY - 2003/4/10

Y1 - 2003/4/10

N2 - We have previously described (RS)-2-amino-3-(3-hydroxy-7,8-dihydro-6H-cyclohepta[d]isoxazol-4-yl)propionic acid (4-AHCP) as a highly effective agonist at non-N-methyl-d-aspartate (non-NMDA) glutamate (Glu) receptors in vivo, which is more potent than (RS)-2-amino-3-(3-hydroxy-5-methylisoxazol-4-yl)propionic acid (AMPA) but inactive at NMDA receptors. However, 4-AHCP was found to be much weaker than AMPA as an inhibitor of [(3)H]AMPA binding and to have limited effect in a [(3)H]kainic acid binding assay using rat cortical membranes. To shed light on the mechanism(s) underlying this quite enigmatic pharmacological profile of 4-AHCP, we have now developed a synthesis of (S)-4-AHCP (6) and (R)-4-AHCP (7). At cloned metabotropic Glu receptors mGluR1alpha (group I), mGluR2 (group II), and mGluR4a (group III), neither 6 nor 7 showed significant agonist or antagonist effects. The stereoisomer 6, but not 7, activated cloned AMPA receptor subunits GluR1o, GluR3o, and GluR4o with EC(50) values in the range 4.5-15 microM and the coexpressed kainate-preferring subunits GluR6 + KA2 (EC(50) = 6.4 microM). Compound 6, but not 7, proved to be a very potent agonist (EC(50) = 0.13 microM) at the kainate-preferring GluR5 subunit, equipotent with (S)-2-amino-3-(5-tert-butyl-3-hydroxyisothiazol-4-yl)propionic acid [(S)-Thio-ATPA, 4] and almost 4 times more potent than (S)-2-amino-3-(5-tert-butyl-3-hydroxyisoxazol-4-yl)propionic acid [(S)-ATPA, 3]. Compound 6 thus represents a new structural class of GluR5 agonists. Molecular modeling and docking to a crystal structure of the extracellular binding domain of the AMPA subunit GluR2 has enabled identification of the probable active conformation and binding mode of 6. We are able to rationalize the observed selectivities by comparing the docking of 4 and 6 to subtype constructs, i.e., a crystal structure of the extracellular binding domain of GluR2 and a homology model of GluR5.

AB - We have previously described (RS)-2-amino-3-(3-hydroxy-7,8-dihydro-6H-cyclohepta[d]isoxazol-4-yl)propionic acid (4-AHCP) as a highly effective agonist at non-N-methyl-d-aspartate (non-NMDA) glutamate (Glu) receptors in vivo, which is more potent than (RS)-2-amino-3-(3-hydroxy-5-methylisoxazol-4-yl)propionic acid (AMPA) but inactive at NMDA receptors. However, 4-AHCP was found to be much weaker than AMPA as an inhibitor of [(3)H]AMPA binding and to have limited effect in a [(3)H]kainic acid binding assay using rat cortical membranes. To shed light on the mechanism(s) underlying this quite enigmatic pharmacological profile of 4-AHCP, we have now developed a synthesis of (S)-4-AHCP (6) and (R)-4-AHCP (7). At cloned metabotropic Glu receptors mGluR1alpha (group I), mGluR2 (group II), and mGluR4a (group III), neither 6 nor 7 showed significant agonist or antagonist effects. The stereoisomer 6, but not 7, activated cloned AMPA receptor subunits GluR1o, GluR3o, and GluR4o with EC(50) values in the range 4.5-15 microM and the coexpressed kainate-preferring subunits GluR6 + KA2 (EC(50) = 6.4 microM). Compound 6, but not 7, proved to be a very potent agonist (EC(50) = 0.13 microM) at the kainate-preferring GluR5 subunit, equipotent with (S)-2-amino-3-(5-tert-butyl-3-hydroxyisothiazol-4-yl)propionic acid [(S)-Thio-ATPA, 4] and almost 4 times more potent than (S)-2-amino-3-(5-tert-butyl-3-hydroxyisoxazol-4-yl)propionic acid [(S)-ATPA, 3]. Compound 6 thus represents a new structural class of GluR5 agonists. Molecular modeling and docking to a crystal structure of the extracellular binding domain of the AMPA subunit GluR2 has enabled identification of the probable active conformation and binding mode of 6. We are able to rationalize the observed selectivities by comparing the docking of 4 and 6 to subtype constructs, i.e., a crystal structure of the extracellular binding domain of GluR2 and a homology model of GluR5.

KW - Alanine

KW - Amino Acid Sequence

KW - Animals

KW - CHO Cells

KW - Cricetinae

KW - Excitatory Amino Acid Agonists

KW - Isoxazoles

KW - Ligands

KW - Models, Molecular

KW - Molecular Conformation

KW - Molecular Sequence Data

KW - Monte Carlo Method

KW - Oocytes

KW - Patch-Clamp Techniques

KW - Propionates

KW - Radioligand Assay

KW - Receptors, Kainic Acid

KW - Sequence Homology, Amino Acid

KW - Stereoisomerism

KW - Structure-Activity Relationship

KW - Xenopus laevis

U2 - 10.1021/jm0204441

DO - 10.1021/jm0204441

M3 - Journal article

C2 - 12672235

SN - 0022-2623

VL - 46

SP - 1350

EP - 1358

JO - Journal of Medicinal Chemistry

JF - Journal of Medicinal Chemistry

IS - 8

ER -