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Linden AM, Schmitt U, Leppä E, et al. Ro 15-4513 Antagonizes Alcohol-Induced Sedation in Mice Through αβγ2-type GABA(A) Receptors. Front Neurosci. 2011;5:3doi: 10.3389/fnins.2011.00003.
Linden, A. M., Schmitt, U., Leppä, E., Wulff, P., Wisden, W., Lüddens, H., & Korpi, E. R. (2011). Ro 15-4513 Antagonizes Alcohol-Induced Sedation in Mice Through αβγ2-type GABA(A) Receptors. Frontiers in neuroscience, 53. https://doi.org/10.3389/fnins.2011.00003
Linden, Anni-Maija, et al. "Ro 15-4513 Antagonizes Alcohol-Induced Sedation in Mice Through αβγ2-type GABA(A) Receptors." Frontiers in neuroscience vol. 5 (2011): 3. doi: https://doi.org/10.3389/fnins.2011.00003
Linden AM, Schmitt U, Leppä E, Wulff P, Wisden W, Lüddens H, Korpi ER. Ro 15-4513 Antagonizes Alcohol-Induced Sedation in Mice Through αβγ2-type GABA(A) Receptors. Front Neurosci. 2011 Jan 20;5:3. doi: 10.3389/fnins.2011.00003. eCollection 2011. PMID: 21270945; PMCID: PMC3026482.
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Front Neurosci. 2011 Jan 20;5:3. doi: 10.3389/fnins.2011.00003. eCollection 2011.

Ro 15-4513 Antagonizes Alcohol-Induced Sedation in Mice Through αβγ2-type GABA(A) Receptors.

Frontiers in neuroscience

Anni-Maija Linden, Ulrich Schmitt, Elli Leppä, Peer Wulff, William Wisden, Hartmut Lüddens, Esa R Korpi

Affiliations

  1. Pharmacology, Institute of Biomedicine, University of Helsinki Helsinki, Finland.

PMID: 21270945 PMCID: PMC3026482 DOI: 10.3389/fnins.2011.00003

Abstract

Ethyl alcohol (ethanol) has many molecular targets in the nervous system, its potency at these sites being low compared to those of sedative drugs. This has made it difficult to discover ethanol's binding site(s). There are two putative binding sites at γ-aminobutyric acid (GABA) type A receptor subtypes for the proposed ethanol antagonist Ro 15-4513, the established γ2 subunit-dependent benzodiazepine site and the recently reported δ subunit-dependent Ro 15-4513/ethanol binding site. Here, we aimed at clarifying the in vivo role of Ro 15-4513 at these two sites. We found that the antagonism of ethanol actions by Ro 15-4513 in wildtype mice was dependent on the test: an open field test showed that light sedation induced by 1.5-1.8 g/kg ethanol was sensitive to Ro 15-4513, whereas several tests for ethanol-induced anxiolytic effects showed that the ethanol-induced effects were insensitive to Ro 15-4513. Antagonism of ethanol-induced sedation by Ro 15-4513 was unaffected in GABA(A) receptor δ subunit knockout mice. By contrast, when testing the GABA(A) receptor γ2 subunit F77I knock-in mouse line (γ2I77 mice) with its strongly reduced affinity of the benzodiazepine sites for Ro 15-4513, we found that the ethanol-induced sedation was no longer antagonized by Ro 15-4513. Indeed, γ2I77 mice had only a small proportion of high-affinity binding of [(3)H]Ro 15-4513 left as compared to wildtype mice, especially in the caudate-putamen and septal areas, but these residual sites are apparently not involved in ethanol antagonism. In conclusion, we found that Ro 15-4513 abolished the sedative effect of ethanol by an action on γ2 subunit-dependent benzodiazepine sites.

Keywords: GABAA receptor; Ro 15-4513; alcohol antagonist; ethanol; inverse agonist

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