[Expression level changes of inhibitor of differentiation 1 during ATRA-induced acute promyelocytic leukemia cells differentiation].

Objective: To study the role of inhibitor of differentiation 1 (ID1) in ATRA-induced acute promyelocytic leukemia (APL) cells differentiation.

Methods: The expression of ID1 was detected by cDNA microarray, cycloheximide inhibition test, real-time RT-PCR and western blot.

Results: The expression of ID1 gene was up-regulated in ATRA-induced NB4 cells and APL cells from two patients and was independent on other proteins synthesis. ID1 expression level reached the peak at 2 h in NB4 cells induced by ATRA, its relative expression level was (359.4 +/- 48.7)-fold greater than control. ID1 expression level reached the peak at 2 h in bone marrow cells from APL patents treated with ATRA, and its level detected 3 times in one of the patient was (311.1 +/- 48.7) fold of control. The expression of ID1 protein was not up-regulated in ATRA resistant NB4-R2 cells after ATRA treatment.

Conclusion: ID1 may be involved in ATRA-induced granulocytic differentiation as an ATRA-targeted gene.