Add time:08/28/2019         Source:sciencedirect.com

Tissue-nonspecific alkaline phosphatase (TNAP) is an ectoenzyme crucial for bone matrix mineralization via its ability to hydrolyze extracellular inorganic pyrophosphate (ePPi), a potent mineralization inhibitor, to phosphate (Pi). By the controlled hydrolysis of ePPi, TNAP maintains the correct ratio of Pi to ePPi and therefore enables normal skeletal and dental calcification. In other areas of the body low ePPi levels lead to the development of pathological soft-tissue calcification, which can progress to a number of disorders. TNAP inhibitors have been shown to prevent these processes via an increase of ePPi. Herein we describe the use of a whole blood assay to optimize a previously described series of TNAP inhibitors resulting in 5-((5-chloro-2-methoxyphenyl)sulfonamido)nicotinamide (SBI-425), a potent, selective and oral bioavailable compound that robustly inhibits TNAP in vivo.

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