Proximal E-box contributes ILEI promoter vemurafenib responsiveness.
A, luciferase assay of various length ILEI promoter reporter constructs in 501-Mel melanoma cell lines. Black bars indicate control DMSO treatment and white bars indicate 24 h treatment with vemurafenib (1 μm). Values are normalized to DMSO treatment of the particular reporter construct. n = 3, mean ± S.D., p value was indicated by Student's t test as compared with vemurafenib treatment of the empty promoterless reporter. B, luciferase assay of WT and E-box mutant (CACGTG to CAAATG) ILEI promoter reporter constructs (−300/−80) in 501-Mel melanoma cell lines. Black bars indicate control DMSO treatment and white bars indicate 24 h treatment with vemurafenib (1 μm). n = 3, mean ± S.D., p value was indicated by Student's t test comparing vemurafenib to DMSO treatment.