Catalytic activity:NAD (+) + H (2) O = ADP-ribose + nicotinamide. ,developmental stage:Preferentially expressed at both early and late stages of the B and T-cell maturation. It is also detected on erythroid and myeloid progenitors in bone marrow , where the level of surface expression was shown to decrease during differentiation of blast-forming unit E to colony-forming unit E. ,enzyme regulation:ATP inhibits the hydrolyzing activity. ,Function:Synthesizes cyclic ADP-ribose , a second messenger for glucose-induced insulin secretion. Also has cADPr hydrolase activity. Also moonlights as a receptor in cells of the immune system. ,online information:CD38 entry ,similarity:Belongs to the ADP-ribosyl cyclase family. ,tissue specificity:Expressed at high levels in pancreas , liver , kidney , brain , testis , ovary , placenta , malignant lymphoma and neuroblastoma. ,
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