Evaluation of PhTX-74 as Subtype-Selective Inhibitor of GluA2-Containing AMPA Receptors

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Evaluation of PhTX-74 as Subtype-Selective Inhibitor of GluA2-Containing AMPA Receptors. / Poulsen, Mette Homann; Lucas, Simon; Strømgaard, Kristian; Kristensen, Anders Skov.

In: Molecular Pharmacology, Vol. 85, No. 2, 02.2014, p. 261-268.

Research output: Contribution to journalJournal articleResearchpeer-review

Harvard

Poulsen, MH, Lucas, S, Strømgaard, K & Kristensen, AS 2014, 'Evaluation of PhTX-74 as Subtype-Selective Inhibitor of GluA2-Containing AMPA Receptors', Molecular Pharmacology, vol. 85, no. 2, pp. 261-268. https://doi.org/10.1124/mol.113.089961

APA

Poulsen, M. H., Lucas, S., Strømgaard, K., & Kristensen, A. S. (2014). Evaluation of PhTX-74 as Subtype-Selective Inhibitor of GluA2-Containing AMPA Receptors. Molecular Pharmacology, 85(2), 261-268. https://doi.org/10.1124/mol.113.089961

Vancouver

Poulsen MH, Lucas S, Strømgaard K, Kristensen AS. Evaluation of PhTX-74 as Subtype-Selective Inhibitor of GluA2-Containing AMPA Receptors. Molecular Pharmacology. 2014 Feb;85(2):261-268. https://doi.org/10.1124/mol.113.089961

Author

Poulsen, Mette Homann ; Lucas, Simon ; Strømgaard, Kristian ; Kristensen, Anders Skov. / Evaluation of PhTX-74 as Subtype-Selective Inhibitor of GluA2-Containing AMPA Receptors. In: Molecular Pharmacology. 2014 ; Vol. 85, No. 2. pp. 261-268.

Bibtex

@article{be2a6ea49aa84823858f139879b831c1,
title = "Evaluation of PhTX-74 as Subtype-Selective Inhibitor of GluA2-Containing AMPA Receptors",
abstract = "The α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptors (AMPARs) are glutamate-gated cation channels that mediate fast excitatory synaptic transmission in the central nervous system. AMPARs are tetramers formed by homo- or heteromeric assembly of GluA1-4 subunits to produce multiple subtypes with varying biophysical properties. Polyamine toxins such as joro spider toxins, philanthotoxins (PhTXs), and argiotoxins are use-dependent ion channel blockers of AMPARs widely employed as highly potent antagonists of GluA2-lacking receptor subtypes. In addition to this use, recent findings have indicated that a philanthotoxin analog, PhTX-74, can distinguish among GluA2-containing AMPAR subtypes in the presence of the prototypical transmembrane AMPAR regulatory protein γ-2 (or stargazin). Thus, PhTX-74 may be of potential use in studies of the neurobiological role of GluA2-containing subtypes. We have evaluated the pharmacological profile of PhTX-74 and related polyamine toxins at homo- and heteromeric AMPARs in the presence and absence of γ-2. Determination of IC50 values for inhibition of glutamate-evoked currents from Xenopus oocytes expressing recombinant homo- or heteromeric combinations of GluA1, GluA2, and GluA3 in the presence of γ-2 shows that PhTX-74 inhibits homomeric GluA1 and GluA3 receptors nonselectively, with IC50 values in the nanomolar range (252-356 nM), and heteromeric GluA1/A2 and GluA2/A3 receptors nonselectively, with IC50 values in the micromolar range (22 μM). Thus, in contrast to earlier findings, we find that PhTX-74 cannot pharmacologically discriminate between GluA2-containing AMPAR subtypes.",
keywords = "Faculty of Health and Medical Sciences",
author = "Poulsen, {Mette Homann} and Simon Lucas and Kristian Str{\o}mgaard and Kristensen, {Anders Skov}",
year = "2014",
month = "2",
doi = "10.1124/mol.113.089961",
language = "English",
volume = "85",
pages = "261--268",
journal = "Molecular Pharmacology",
issn = "0026-895X",
publisher = "American Society for Pharmacology and Experimental Therapeutics",
number = "2",

}

RIS

TY - JOUR

T1 - Evaluation of PhTX-74 as Subtype-Selective Inhibitor of GluA2-Containing AMPA Receptors

AU - Poulsen, Mette Homann

AU - Lucas, Simon

AU - Strømgaard, Kristian

AU - Kristensen, Anders Skov

PY - 2014/2

Y1 - 2014/2

N2 - The α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptors (AMPARs) are glutamate-gated cation channels that mediate fast excitatory synaptic transmission in the central nervous system. AMPARs are tetramers formed by homo- or heteromeric assembly of GluA1-4 subunits to produce multiple subtypes with varying biophysical properties. Polyamine toxins such as joro spider toxins, philanthotoxins (PhTXs), and argiotoxins are use-dependent ion channel blockers of AMPARs widely employed as highly potent antagonists of GluA2-lacking receptor subtypes. In addition to this use, recent findings have indicated that a philanthotoxin analog, PhTX-74, can distinguish among GluA2-containing AMPAR subtypes in the presence of the prototypical transmembrane AMPAR regulatory protein γ-2 (or stargazin). Thus, PhTX-74 may be of potential use in studies of the neurobiological role of GluA2-containing subtypes. We have evaluated the pharmacological profile of PhTX-74 and related polyamine toxins at homo- and heteromeric AMPARs in the presence and absence of γ-2. Determination of IC50 values for inhibition of glutamate-evoked currents from Xenopus oocytes expressing recombinant homo- or heteromeric combinations of GluA1, GluA2, and GluA3 in the presence of γ-2 shows that PhTX-74 inhibits homomeric GluA1 and GluA3 receptors nonselectively, with IC50 values in the nanomolar range (252-356 nM), and heteromeric GluA1/A2 and GluA2/A3 receptors nonselectively, with IC50 values in the micromolar range (22 μM). Thus, in contrast to earlier findings, we find that PhTX-74 cannot pharmacologically discriminate between GluA2-containing AMPAR subtypes.

AB - The α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptors (AMPARs) are glutamate-gated cation channels that mediate fast excitatory synaptic transmission in the central nervous system. AMPARs are tetramers formed by homo- or heteromeric assembly of GluA1-4 subunits to produce multiple subtypes with varying biophysical properties. Polyamine toxins such as joro spider toxins, philanthotoxins (PhTXs), and argiotoxins are use-dependent ion channel blockers of AMPARs widely employed as highly potent antagonists of GluA2-lacking receptor subtypes. In addition to this use, recent findings have indicated that a philanthotoxin analog, PhTX-74, can distinguish among GluA2-containing AMPAR subtypes in the presence of the prototypical transmembrane AMPAR regulatory protein γ-2 (or stargazin). Thus, PhTX-74 may be of potential use in studies of the neurobiological role of GluA2-containing subtypes. We have evaluated the pharmacological profile of PhTX-74 and related polyamine toxins at homo- and heteromeric AMPARs in the presence and absence of γ-2. Determination of IC50 values for inhibition of glutamate-evoked currents from Xenopus oocytes expressing recombinant homo- or heteromeric combinations of GluA1, GluA2, and GluA3 in the presence of γ-2 shows that PhTX-74 inhibits homomeric GluA1 and GluA3 receptors nonselectively, with IC50 values in the nanomolar range (252-356 nM), and heteromeric GluA1/A2 and GluA2/A3 receptors nonselectively, with IC50 values in the micromolar range (22 μM). Thus, in contrast to earlier findings, we find that PhTX-74 cannot pharmacologically discriminate between GluA2-containing AMPAR subtypes.

KW - Faculty of Health and Medical Sciences

U2 - 10.1124/mol.113.089961

DO - 10.1124/mol.113.089961

M3 - Journal article

C2 - 24220009

VL - 85

SP - 261

EP - 268

JO - Molecular Pharmacology

JF - Molecular Pharmacology

SN - 0026-895X

IS - 2

ER -

ID: 94826539