DDIT3 and KAT2A Proteins Regulate TNFRSF10A and TNFRSF10B Expression in Endoplasmic Reticulum Stress-mediated Apoptosis in Human Lung Cancer Cells.

The Journal of Biological Chemistry
Tianliang LiXiangguo Liu

Abstract

TNFRSF10A and TNFRSF10B are cell surface receptors that bind to tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) and mediate the extrinsic pathway of apoptosis. However, the mechanisms of transcriptional regulation of TNFRSF10A and TNFRSF10B remain largely uncharacterized. In this study, two putative DDIT3 binding sites (-1636/-1625; -374/-364) and a putative AP-1 binding site (-304/-298) were identified in the TNFRSF10A promoter region. We found that DDIT3 interacts with phospho-JUN, and the DDIT3·phospho-JUN complex binds to the AP-1 binding site (-304/-298) within the TNFRSF10A promoter region. In addition, we confirmed that KAT2A physically interacts with the N-terminal region (amino acids 1-26) of DDIT3. Importantly, knockdown of KAT2A down-regulated TNFRSF10A and TNFRSF10B and dramatically decreased promoter activity of cells transfected with luciferase reporter plasmid containing the AP-1 binding site (-304/-298) of the TNFRSF10A promoter, as well as cells transfected with luciferase reporter plasmid containing DDIT3 binding site (-276/-264) of the TNFRSF10B promoter. ChIP results suggest that KAT2A may participate in a KAT2A·DDIT3·phospho-JUN complex, or may participate in a KAT2A·DDIT3 complex and acetyl...Continue Reading

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