Figure 4.
p65-mediated asporin promoter activity directly in human nucleus pulposus cells. (a) Asporin promoter activity detected by dual-luciferase reporter gene assay system in the presence of different doses of p65 and/or IL-1β. (b) Asporin promoter activity detected by dual-luciferase reporter gene assay system in the presence of different doses of p65/Bay 11 and/or 10 ng/ml IL-1β. (c) The specific sequences of the two putative p65 binding sites on the asporin promoter. (d) The schematic of the wild-type and mutant human asporin promoter constructs. (e and f) Asporin promoter activity induced by different doses of p65 and/or 10 ng/ml IL-1β with or without putative p65 binding sites mutation on asporin promoter. *P < 0.05, ***P < 0.001. P values were analyzed by one-way ANOVA. All data are representative of three independent experiments and are means ± SEM.