The transcriptional regulation of human arachidonate 12‐lipoxygenase gene by NFκB/Rel

Abstract
As examined by the luciferase assay, a negative regulatory region including the NFκB motif was found in the 5′‐flanking region of the 12‐lipoxygenase gene in human erythroleukemia cells. The negative control was abolished by a site‐specific mutation of the NFκB motif. Probes including the NFκB region gave positive bands upon a gel‐shift assay. The bands were supershifted by antibodies for NFκB p50, NFκB p65 and c‐Rel, and were lost by a NFκB competitor DNA. Furthermore, the NFκB sequence was protected in DNase I footprinting. Thus, two kinds of heterodimer (p50 and p65; p50 and c‐Rel) seemed to control the over‐expression of the human 12‐lipoxygenase gene.