| Bioactivity | A-740003 is a potent, selective and competitive P2X7 receptor antagonist with IC50 values are 18 and 40 nM for rat and human P2X7 receptors, respectively. | ||||||||||||
| Target | IC50: 18 nM (rat P2X7 receptor), 40 nM (human P2X7 receptor) | ||||||||||||
| Invitro | A 438079 or A 740003 (10 μM) significantly blocks the sustained phase of the BzATP-induced response[1]. A-740003 infusion reduces SE-induced TNF-α expression in dentate granule cells. A-740003 infusions increases SE-induced neuronal death[2]. A-740003 and A-438079 show significantly greater potency in blocking P2X7 receptor activation across all species compared with other antagonists. A-740003 and A-438079 show greater activity at rat and human, as compared with mouse P2X7 receptors[3]. A-740003 potently blocks agonist-evoked IL-1β release with (IC50=156 nM) and pore formation (IC50=92 nM) in differentiated human THP-1 cells[4]. | ||||||||||||
| In Vivo | Systemic administration of A-740003 produces dose-dependent antinociception in a spinal nerve ligation model (ED50=19 mg/kg i.p.) in the rat. A-740003 also attenuates tactile allodynia in two other models of neuropathic pain, chronic constriction injury of the sciatic nerve and vincristine-induced neuropathy. In addition, A-740003 effectively reduces thermal hyperalgesia observed following intraplantar administration of carrageenan or complete Freund's adjuvant (ED50=38-54 mg/kg i.p.). A-740003 is ineffective in attenuating acute thermal nociception in normal rats and does not alter motor performance at analgesic doses[4]. | ||||||||||||
| Name | A-740003 | ||||||||||||
| CAS | 861393-28-4 | ||||||||||||
| Formula | C26H30N6O3 | ||||||||||||
| Molar Mass | 474.55 | ||||||||||||
| Appearance | Solid | ||||||||||||
| Transport | Room temperature in continental US; may vary elsewhere. | ||||||||||||
| Storage |
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| Reference | [1]. Grol MW, et al. P2X?-mediated calcium influx triggers a sustained, PI3K-dependent increase in metabolic acid production by osteoblast-like cells. Am J Physiol Endocrinol Metab. 2012 Mar 1;302(5):E561-75. [2]. Kim JE, et al. P2X7 receptor activation ameliorates CA3 neuronal damage via a tumor necrosis factor-α-mediated pathway in the rat hippocampus following status epilepticus. J Neuroinflammation. 2011 Jun 2;8:62. [3]. Donnelly-Roberts DL, et al. Mammalian P2X7 receptor pharmacology: comparison of recombinant mouse, rat and human P2X7 receptors.Br J Pharmacol. 2009 Aug;157(7):1203-14. Epub 2009 Jun 22. [4]. Honore P, et al. A-740003 [N-(1-{[(cyanoimino)(5-quinolinylamino) methyl]amino}-2,2-dimethylpropyl)-2-(3,4-dimethoxyphenyl)acetamide], a novel and selective P2X7 receptor antagonist, dose-dependently reduces neuropathic pain in the rat. J Pharmacol Exp Th [5]. Y. H. Gao, et al. Effect of electroacupuncture on the cervicospinal P2X7 receptor/fractalkine/CX3CR1 signaling pathway in a rat neck-incision pain model. Purinergic Signal. 2017 Jun;13(2):215-225. |