Activator protein 1 transcription factor (AP-1)

Activator protein 1 transcription factor (AP‑1) is a dimeric transcription factor composed primarily of proteins from the Jun (e.g., c-Jun), Fos (e.g., c-Fos), ATF, and JDP families[1][2][5]. It binds specific DNA sequences known as TPA-response elements in promoter or enhancer regions to regulate downstream gene expression in response to diverse stimuli such as cytokines, growth factors, stress signals, and infections[1][2]. AP‑1 plays critical roles in controlling cellular processes including cell growth, proliferation, differentiation, and apoptosis. Its activity is modulated by post-translational modifications and interactions with other proteins. Dysregulation or overactivation of AP‑1 has been implicated in various diseases—most notably cancer—where it can promote tumor progression and therapy resistance[2]. Small molecule inhibitors targeting AP‑1 have been developed for research purposes; curcumin is one example that inhibits its activity by blocking dimer formation or DNA binding[3]. Note on correctness: The term "Activator protein 1 pathway" is not standard; the correct therapeutic target name should be "Activator protein 1 transcription factor" or simply "AP‑1." The pathway terminology may refer more broadly to upstream signaling cascades that activate this complex rather than the molecular target itself.

Other names

Activating protein 1AP-1 complexTranscription factor AP-1

Inhibition of DNA binding by disrupting dimerization or direct binding to consensus sequences