Fig. 5: NRP1 is a direct target of HIF-1α.

A Luciferase reporter assay in A549 and SPC-A1 cells after transfection with pGL3-reporter plasmids containing the NRP1 promoter or basic vector with or without pcDNA3.1-HIF-1α for 24 h. B, C ChIP assay was performed to detect whether HIF-1α binds to the NRP1 promoter in A549 and SPC-A1 cells. D Diagram of the NRP1 promoter structure with potential or mutant HIF-1α binding sites. E Luciferase reporter assay in A549 and SPC-A1 cells after transfection with a set of luciferase reporter plasmids containing potential binding sites of the NRP1 promoter or mutants at two HIF-1α binding sites for 24 h.