TNP-ATP tetrasodium

TNP-ATP is an antagonist of purinergic P2Y1, P2X3, and P2X2/3 receptors, exhibiting IC50 values of 6, 0.9, and 7 nM, respectively, in HEK293 cells expressing human receptors. It reduces acetic acid-induced calcium flux in 1321N1 cells expressing P2X3 and P2X2/3 receptors with IC50 values of 100 and 62 nM, respectively. TNP-ATP also dose-dependently alleviates acetic acid-induced writhing responses in a visceral pain model in mice, with an ED50 of 6.35 μmol/kg.