PMID: 11932067Apr 5, 2002Paper

Analgesic and anti-inflammatory effects of A-286501, a novel orally active adenosine kinase inhibitor

Pain
M F JarvisE A Kowaluk

Abstract

Adenosine (ADO) is an inhibitory neuromodulator that can increase nociceptive thresholds in response to noxious stimulation. Inhibition of the ADO-metabolizing enzyme, adenosine kinase (AK) increases extracellular ADO concentrations at sites of tissue trauma and AK inhibitors may have therapeutic potential as analgesic and anti-inflammatory agents. N7-((1'R,2'S,3'R,4'S)-2',3'-dihydroxy-4'-amino-cyclopentyl)-4-amino-5-bromo-pyrrolo[2,3-a]pyrimidine (A-286501) is a novel and potent (IC50=0.47 nM) carbocyclic nucleoside AK inhibitor that has no significant activity (IC50 >100 microM) at other sites of ADO interaction (A1, A2A, A3 receptors, ADO transporter, and ADO deaminase) or other (IC50 value >10 microM) neurotransmitter and peptide receptors, ion channel proteins, neurotransmitter reuptake sites and enzymes, including cyclooxygenases-1 and -2. A-286501 showed equivalent potency to inhibit AK from several mammalian species and kinetic studies revealed that A-286501 was a reversible and competitive inhibitor with respect to ADO and non-competitive with respect to MgATP2-. A-286501 was orally effective to reduce nociception in animal models of acute (thermal), inflammatory (formalin and carrageenan), and neuropathic (L5/L6 nerve...Continue Reading

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Citations

Jan 12, 2008·Naunyn-Schmiedeberg's Archives of Pharmacology·Andras Bilkei-GorzoAndreas Zimmer
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