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ARL 67156 trisodium salt is a selective inhibitor of ecto-ATPase. Also, FPL 67156 is a weak agonist of P2U-purinoceptors and weak antagonist of P2T- and P2X-purinoceptors [1].

Ecto-ATPase is an integral membrane protein that catalyzes the hydrolysis of extracellular ATP to ADP and inorganic phosphate.

ARL 67156 trisodium salt is a selective ecto-ATPase inhibitor. In the human blood cell assay, ARL 67156 inhibited ATP degradation with pIC50 value of 4.62. In the rabbit ear artery, ARL 67156 30 μM-1 mM) increased the contractile effects of ATP and inhibited ecto-ATPase with pKI value of 5.2 [1]. In the guinea-pig vas deferens, ARL 67156 (5-100 μM) significantly increased neurogenic contract response to nerve stimulation in a concentration-dependent way, which was due to potentiation of the action of ATP [2]. In HEK 293T or COS-7 cells transfected with human NPP1, NPP3, NTPDase1, 2, 3 or 8, ARL 67156 (50-100 μM) competitively inhibited human NPP1, NTPDase1 and NTPDase3 with Ki values of 12, 11 and 18 μM, respectively [3].

In warfarin-induced mineralization rat model, ARL67156 inhibited mineralization of the aortic valve/aorta and prevented aortic stenosis by the inhibition of apoptosis. Also, ARL67156 normalized the level of pAkt, which was involved in the survival pathway [4].

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