Review Article

The Role of Peroxisome Proliferator-Activated Receptors in the Esophageal, Gastric, and Colorectal Cancer

Figure 1

PPARs-mediated mechanisms of transcriptional regulation. In the absence of ligands, PPARs bind the promoters of their target genes and repress transcription by recruiting the corepressor complex. In the presence of ligands, PPARs can induce either ligand-dependent transactivation or transrepression. Transactivation involves PPARs heterodimerization with the retinoid X receptors (RXRs) followed by recognition of specific PPAR response elements (PPREs) and interaction with coactivators. Transrepression involves interference with other signal transduction pathways, including N F 𝜅 B, STAT, and AP1. N F 𝜅 B-RE: N F 𝜅 B response element; IFN-RE = “interferon-stimulated gene factor” responsive element; TRE = O-tetradecanoylphorbol 13-acetate-responsive element.
242498.fig.001