RESUMO
OBJECTIVE: To investigate the transcriptional regulation of transcription factor MZF-1 on acute monocytic leukemia-related gene MLAA-34. METHODS: The effect of MZF-1 on the transcriptional activity of MLAA-34 gene promoter was analyzed by luciferase reporter gene detection system and site-directed mutation technique. The EMSA and ChIP assay were used to verify whether MZF-1 directly and specifically binds to the core region of MLAA-34 promoter. The over-expression vector and interference vector of MZF-1 were constructed to transfect U937 cells, and RT-PCR and Western blot were used to detect the transcription and expression changes of MLAA-34 gene. RESULTS: The transcription factor MZF-1 had a regulatory effect on MLAA-34 gene expression, and the relative luciferase activity was decreased after MZF-1 binding point mutation (P<0.01). EMSA and ChIP experiments demonstrated that MZF-1 could directly bind to MLAA-34 promoter and play a regulatory role. In the over-expression test, the increase of MZF-1 could up-regulate the expression of MLAA-34 (P<0.05). In the interference test, the decrease of MZF-1 could down-regulate the expression of MLAA-34 (P<0.05). CONCLUSION: Transcription factor MZF-1 can bind to the transcriptional regulatory region on the promoter of MLAA-34 gene and promote the transcription of MLAA-34 gene in acute monocytic leukemia.