Clazosentan

• CAT Number: R059607
• CAS Number: 180384-56-9
• Molecular Formula: C25H23N9O6S
• Molecular Weight: 577.57
• Purity: ≥95%
• Synonyms: N-[6-(2-hydroxyethoxy)-5-(2-methoxyphenoxy)-2-[2-(2H-tetrazol-5-yl)pyridin-4-yl]pyrimidin-4-yl]-5-methylpyridine-2-sulfonamide
• InChI: InChI=1S/C25H23N9O6S/c1-15-7-8-20(27-14-15)41(36,37)32-24-21(40-19-6-4-3-5-18(19)38-2)25(39-12-11-35)29-22(28-24)16-9-10-26-17(13-16)23-30-33-34-31-23/h3-10,13-14,35H,11-12H2,1-2H3,(H,28,29,32)(H,30,31,33,34)
• InChIKey: LFWCJABOXHSRGC-UHFFFAOYSA-N
• SMILES: CC1=CN=C(C=C1)S(=O)(=O)NC2=C(C(=NC(=N2)C3=CC(=NC=C3)C4=NNN=N4)OCCO)OC5=CC=CC=C5OC

Clazosentan (Ro 61-1790) is a selective endothelin A (ETA) receptor antagonist. Clazosentan inhibits ET-1-mediated vasoconstriction. Clazosentan prevents cerebral vasospasm, vasospasm-related cerebral infarction[1][5].
Clazosentan (0.1 μM) inhibits the ETA receptor in cerebral arteries[3].
Clazosentan is a substrate of the organic anion-transporting polypeptide (OATP) 1B1/1B3[5].
Clazosentan (10 μM, 0.05 mL/kg, intracisternal injection) inhibits the contractile responses to ET-1 in rats[2].
Clazosentan (10 mg/kg, s.c.) inhibits IL-33-induced hypernociception in mice[4].

Reference

[1]. Juif PE, et al. Clinical Pharmacology of Clazosentan, a Selective Endothelin A Receptor Antagonist for the Prevention and Treatment of aSAH-Related Cerebral Vasospasm. Front Pharmacol. 2021 Feb 4;11:628956.
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[2]. Povlsen GK, et al. MEK1/2 inhibitor U0126 but not endothelin receptor antagonist clazosentan reduces upregulation of cerebrovascular contractile receptors and delayed cerebral ischemia, and improves outcome after subarachnoid hemorrhage in rats. J Cereb Blood Flow Metab. 2015 Feb;35(2):329-37.
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[3]. Vatter H, et al. Cerebrovascular characterization of clazosentan, the first nonpeptide endothelin receptor antagonist clinically effective for the treatment of cerebral vasospasm. Part I: inhibitory effect on endothelin(A) receptor-mediated contraction. J Neurosurg. 2005 Jun;102(6):1101-7.
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[4]. Verri WA Jr, Guerrero AT, Fukada SY, Valerio DA, Cunha TM, Xu D, Ferreira SH, Liew FY, Cunha FQ. IL-33 mediates antigen-induced cutaneous and articular hypernociception in mice. Proc Natl Acad Sci U S A. 2008 Feb 19;105(7):2723-8.
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[5]. Juif PE, et al. Influence of Rifampin-Mediated Organic Anion-Transporting Polypeptide 1B1/1B3 Inhibition on the Pharmacokinetics of Clazosentan. Clin Transl Sci. 2019 Sep;12(5):440-444.
 [Content Brief]