Using human promyelocytic leukemia cells , we demonstrate that all trans-retinoic acid is a potent and specific inducer of CD38 expression in myeloid lineage.
We reported previously that retinoic acid (RA) is a potent and selective inducer of the cell-surface antigen CD38 in myeloid leukemia cells.
Thus , GDP-ribosyl cyclase and NAD (+) glycohydrolase activities in the nuclear fraction increased very significantly in response to incubation with RA.
When homogenous isolated ADPRT was first ADP-ribosylated in vitro , it lost its capacity to catalyze further polymer synthesis , whereas the NAD glycohydrolase function of the automodified enzyme was greatly augmented.
The Km of the enzyme is 18 microM NAD and it is inhibited by nicotinamide.