1. Academic Validation
  2. Interaction of SSR161421, a novel specific adenosine A(3) receptor antagonist with adenosine A(3) receptor agonists both in vitro and in vivo

Interaction of SSR161421, a novel specific adenosine A(3) receptor antagonist with adenosine A(3) receptor agonists both in vitro and in vivo

  • Eur J Pharmacol. 2013 Jan 15;699(1-3):62-6. doi: 10.1016/j.ejphar.2012.11.046.
Endre G Mikus 1 Kinga Boér Géza Timári Katalin Urbán-Szabó Zoltán Kapui Judit Szeredi Katalin Gerber Tibor Szabó Sándor Bátori Michel Finet Péter Arányi Anne-Marie Galzin
Affiliations

Affiliation

  • 1 Sanofi Co. Ltd., H-1045 Budapest Tó utca 1-5, Hungary. endre.mikus@labmagister.com
Abstract

A novel adenosine A(3) receptor antagonist (SSR161421) was characterized by both receptor binding assays and pharmacological tests. Binding studies on cloned human adenosine receptors showed that SSR161421 has high affinity for adenosine hA(3) receptors (K(i)=0.37 nM) with at least 1000-fold selectivity compared to hA(1), hA(2A) and hA(2B) receptors. The receptor antagonist nature of SSR161421 was determined in a functional study on Chinese hamster ovarian cells (CHO) cells expressing human adenosine A(3) receptors. SSR161421 competitively antagonized the effect of 2-chloro-N6-(3-iodobenzyl)-adenosine-5'-N-methylcarboxamide (Cl-IB-MECA) on cAMP production with a pA2 value in a luciferase reporter gene construct. In mice, intravenously administered SSR161421 inhibited the N6-(4-aminobenzyl)-adenosine-5'-N-methyl-uronamide dihydrochloride (AB-MECA) induced increase in plasma histamine levels (ED(50)=2.0mg/kg) and the Cl-IB-MECA evoked plasma extravasation (ID(50)=2.9 mg/kg) and oedema formation (ID(50)=4.6 mg/kg) in mouse ear.

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