PSB-603

• CAT Number: I008343
• CAS Number: 1092351-10-4
• Molecular Formula: C24H25ClN6O4S
• Molecular Weight: 529.01
• Purity: ≥95%
• Synonyms: 8-[4-[4-(4-chlorophenyl)piperazin-1-yl]sulfonylphenyl]-1-propyl-3,7-dihydropurine-2,6-dione
• InChI: InChI=1S/C24H25ClN6O4S/c1-2-11-31-23(32)20-22(28-24(31)33)27-21(26-20)16-3-9-19(10-4-16)36(34,35)30-14-12-29(13-15-30)18-7-5-17(25)6-8-18/h3-10H,2,11-15H2,1H3,(H,26,27)(H,28,33)
• InChIKey: OVHCTHHFOHMNFV-UHFFFAOYSA-N
• SMILES: CCCN1C(=O)C2=C(NC1=O)N=C(N2)C3=CC=C(C=C3)S(=O)(=O)N4CCN(CC4)C5=CC=C(C=C5)Cl

PSB-603 is a potent and highly selective A2B adenosine receptor antagonist exhibiting a Ki value of 0.553 nM and virtually no affinity for the human and rat A1 and A2A and the human A3 receptors up to a concentration of 10 μM[1].
PSB-603 is a potent and selective adenosine A2B receptor antagonist exhibiting a Ki value of 0.553 nM at the human A2B receptor and virtually no affinity for the human and rat A1 and A2A and the human A3 receptors up to a concentration of 10 μM[1].
PSB-603 shows anti-inflammatory effect in local and systemic inflammation models. PSB-603 (5 mg/kg b.w. ip) significantly reduces inflammation in two mice models of inflammation (local and systemic). PSB-603 significantly decreases levels of the inflammatory cytokines IL-6, TNF-α and of ROS in the inflamed paw and reduces inflammation of the peritoneum by significantly decreasing the infiltration of leukocytes[4].
PSB-603 is administered as suspensions in 1 % Tween 80[4].

Reference

[1]. Thomas Borrmann, et al. 1-alkyl-8-(piperazine-1-sulfonyl)phenylxanthines: development and characterization of adenosine A2B receptor antagonists and a new radioligand with subnanomolar affinity and subtype specificity. J Med Chem. 2009 Jul 9;52
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[2]. Mohamad Wessam Alnouri, et al. Selectivity is species-dependent: Characterization of standard agonists and antagonists at human, rat, and mouse adenosine receptors. Purinergic Signal. 2015 Sep;11(3):389-407.
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[3]. Nadine Borg, et al. CD73 on T Cells Orchestrates Cardiac Wound Healing After Myocardial Infarction by Purinergic Metabolic Reprogramming. Circulation. 2017 Jul 18;136(3):297-313.
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[4]. Magdalena Kotańska, et al. PSB 603 – a known selective adenosine A2B receptor antagonist-has anti-inflammatory activity in mice. Biomed Pharmacother. 2021 Mar;135:111164.
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