1. Structure—Activity Relationships of Analogues of NF449 Confirm NF449 as the Most Potent and Selective Known P2X1 Receptor Antagonist
- Author
-
Gregor Müller, Peter Nickel, Heiko Ullmann, Günter Lambrecht, Matthias Ganso, Kirsten Braun, Matthias U. Kassack, and Barbara Böing
- Subjects
Male ,Stereochemistry ,Suramin ,Guinea Pigs ,Uridine Triphosphate ,Sulfonic acid ,Chemical synthesis ,Cell Line ,Lethal Dose 50 ,Structure-Activity Relationship ,chemistry.chemical_compound ,Adenosine Triphosphate ,Vas Deferens ,P2x1 receptor ,Ileum ,Drug Discovery ,Purinergic P2 Receptor Antagonists ,medicine ,Animals ,Humans ,Structure–activity relationship ,PPADS ,Receptor ,Suramin Sodium ,Pharmacology ,chemistry.chemical_classification ,Dose-Response Relationship, Drug ,Receptors, Purinergic P2 ,Chemistry ,Benzenesulfonates ,Organic Chemistry ,Antagonist ,General Medicine ,Rats ,Receptors, Purinergic P2X ,Urea ,medicine.drug - Abstract
NF449 [4,4',4",4"'-(carbonylbis(imino-5,1,3-benzenetriyl-bis(carbonylimino)))tetrakisbenzene-1,3-disulfonic acid-octasodiumsalt)] was recently described to inhibit recombinant rP2X(1) receptors (Naunyn Schmiedeberg's Arch. Pharmacol. 364 (2001) 285). The purpose of this study was to examine structure-activity-relationships at P2 receptors of a series of NF449 analogues. Thus, compounds containing various arylaminemono-, di-, or trisulfonic acids and a replacement of the central urea bridge were synthesized. NF449 displayed a pIC(50) at P2X(1) receptors (rat vas deferens) of 6.31 +/- 0.04 being at least 19-fold more potent at P2X(1) than at P2X(3), P2Y(1), P2Y(2), or P2Y(11). Any deletion or change of position of sulfonic acid groups or replacing the central urea bond by the bisamide of terephthalic acid reduced the potency at P2X(1) by at least 90%. All compounds were very weak antagonists at P2Y(2) or P2Y(11) receptors (pIC(50)4.5). In conclusion, NF449 remains the most potent and selective P2X(1) antagonist known. Potential lead compounds among the suramin class for P2X(3) (16d) and P2Y(1) (16a) receptors were identified.
- Published
- 2004