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Hydroxylated biphenyl derivatives are positive modulators of human GABAA receptors

Mascia, Maria Paola and Fabbri, Davide and Dettori, Maria Antonietta and Ledda, Giovanni and Delogu, Giovanna and Biggio, Giovanni (2012) Hydroxylated biphenyl derivatives are positive modulators of human GABAA receptors. European Journal of Pharmacology, Vol. 693 (1-3), p. 45-50. eISSN 1879-0712. Article.

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DOI: 10.1016/j.ejphar.2012.07.048

Abstract

A series of 7 hydroxylated biphenyl derivatives (17) were prepared to evaluate their ability to modulate the function of several ligand gated ion channel (LGIC) recombinant receptors expressed in Xenopus laevis oocytes. Compounds 1, 3, 4, 6 and 7 are natural occurring compounds whereas the synthesis of compounds 2 and 5 was previously reported ( Delogu et al., 2004 and Fabbri et al., 2007). None of the compounds tested were able to modify, the activity of the strychnine-sensitive glycine receptor, or the activity of nicotinic receptor. The function of the 5HT3A receptor was partially inhibited by all compounds tested, however this inhibition occurred at relatively high concentrations (100 μM). All compounds, with the exception of compound 6, potentiate the action of gamma-aminobutyric acid (GABA)-evoked Cl currents in Xenopus laevis oocytes expressing recombinant human α1β2γ2L GABAA receptors. Compounds 1, 2, 5 and 7 enhance the function of the GABAA receptor at concentrations higher than 3–10 μM. Compound 4 was the most efficacious. However, compound 3 was the most potent (EC50 0.8 μM). The potency of compound 3 in modulating the function of the GABAA receptor was comparable to that of diazepam, propofol or allopregnanolone. The enhancement of the GABA evoked Cl currents by compound 3 was not affected by flumazenil. Compound 3 did not induce loss of the righting reflex in rats suggesting that it is not an anesthetic agent, however, its ability in protecting the animals from seizures induced by picrotoxin confirm that its action occurs through the GABAA receptor.

Item Type:Article
ID Code:8592
Status:Published
Refereed:Yes
Uncontrolled Keywords:GABAA receptors, Xenopus oocytes, hydroxylated biphenyl derivatives
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di chimica biomolecolare, Sassari
Publisher:Elsevier
eISSN:1879-0712
Deposited On:04 Feb 2013 12:47

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