For research use only.

Catalog No.S8519

A-317491 Chemical Structure

Molecular Weight(MW): 565.57

A-317491 is a novel potent and selective non-nucleotide antagonist of P2X3 and P2X2/3 receptors with Ki values of 22 nM and 9 nM for human P2X3 and P2X2/3 receptors.

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Biological Activity

Description A-317491 is a novel potent and selective non-nucleotide antagonist of P2X3 and P2X2/3 receptors with Ki values of 22 nM and 9 nM for human P2X3 and P2X2/3 receptors.
Human P2X2/3 [1]
(Cell-free assay)
Human P2X3 [1]
(Cell-free assay)
Rat P2X3 [1]
(Cell-free assay)
Rat P2X2/3 [1]
(Cell-free assay)
9 nM(Ki) 22 nM(Ki) 22 nM(Ki) 92 nM(Ki)
In vitro

A-317491 potently blocks recombinant human and rat P2X3 and P2X2/3 receptor-mediated calcium flux (Ki = 22-92 nM) and is highly selective (IC50 >10 μM) over other P2 receptors and other neurotransmitter receptors, ion channels, and enzymes. A-317491 does not undergo any detectable metabolism (oxidation or glucuronidation) in in vitro assays using human and rat liver microsomes[1].

In vivo A-317491 dose-dependently (ED50 = 30 μmol/kg s.c.) reduces complete Freund's adjuvant-induced thermal hyperalgesia in the rat. A-317491 is most potent (ED50 = 10-15 μmol/kg s.c.) in attenuating both thermal hyperalgesia and mechanical allodynia after chronic nerve constriction injury. Although active in chronic pain models, A-317491 is ineffective (ED50 >100 μmol/kg s.c.) in reducing nociception in animal models of acute pain, postoperative pain, and visceral pain. Preliminary pharmacokinetic studies in rats indicate that 10 μmol/kg A-317491 had high (≈80%) systemic bioavailability after s.c. dosing (estimated plasma concentration = 15 μg/ml, >99% protein bound) and a half-life in plasma of 11 h[1]. A-317491 is effective in reducing pain associated behavior in several animal models of inflammatory and neuropathic pain when administered systemically. A-317491 does not significantly penetrate into the CNS[2].


Animal Research:


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  • Animal Models: male Sprague-Dawley rats
  • Dosages: 3, 10 and 30 mg/kg
  • Administration: s.c.
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 100 mg/mL (176.81 mM)
Ethanol 100 mg/mL (176.81 mM)
Water Insoluble

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 565.57


CAS No. 475205-49-3
Storage powder
in solvent
Synonyms N/A
Smiles C1CC(C2=CC=CC=C2C1)N(CC3=CC(=CC=C3)OC4=CC=CC=C4)C(=O)C5=CC(=C(C=C5C(=O)O)C(=O)O)C(=O)O

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Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

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P2 Receptor Signaling Pathway Map

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID