NTPDase3

Nucleoside triphosphate diphosphohydrolase 3 (NTPDase3) is a membrane-bound ectonucleotidase that hydrolyzes extracellular ATP and ADP, thereby modulating purinergic signaling in diverse tissues^[1][2]. In pancreatic β-cells, NTPDase3 regulates glucose-induced insulin secretion by controlling the availability of ATP to P2 purinergic receptors, impacting insulinotropic responses under varying glucose conditions^[2][3]. Mechanistically, NTPDase3 activity affects the balance between ATP, ADP, and AMP, influencing downstream P1 and P2 receptor signaling^[4]. Distinct from related isoforms such as NTPDase1 and NTPDase2, NTPDase3 exhibits a unique expression profile, being abundant in pancreatic islets, digestive epithelial cells, and enteric neurons, while other isoforms localize primarily to vasculature or glial cells^[3][4][5]. Structural analyses have revealed five conserved disulfide bonds critical for enzymatic activity, proper folding, and trafficking to the plasma membrane, and NTPDase3 shares limited homology with bacterial exopolyphosphatases, providing a framework for structural modeling^[6]. Functionally, selective inhibition of NTPDase3 by ectonucleotidase blockers such as ARL67156 enhances insulin secretion, illustrating its potential as a modulatory target in experimental studies of purinergic signaling and metabolic regulation^[2][3]. In disease models, global deletion of NTPDase3 confers protection against diet-induced obesity, mediated through increased basal energy metabolism and enhanced thermogenic gene expression, highlighting its role beyond pancreatic β-cells^[7].