Amyloid precursor protein mRNA iron-responsive element (APP mRNA IRE)

The Amyloid precursor protein mRNA iron-responsive element (APP mRNA IRE) is a specialized RNA secondary structure located within the 5'-untranslated region (5'-UTR) of the APP gene transcript (Rogers et al., 2002). It serves as a critical post-transcriptional regulator of APP synthesis, modulating protein production in response to intracellular iron concentrations (Bandyopadhyay et al., 2013). In the presence of low iron, Iron Regulatory Protein 1 (IRP1) binds to the APP IRE, sterically hindering the assembly of the translation initiation complex and suppressing APP synthesis. When iron levels are elevated, IRP1 dissociates from the mRNA, allowing for rapid translation and the subsequent generation of amyloid-beta (Aβ) peptides (NIH, 2024). Dysregulation of this iron-dependent mechanism is implicated in the pathogenesis of Alzheimer's disease, where iron accumulation promotes the overproduction of neurotoxic Aβ plaques (MDPI, 2023). Pharmacological agents such as Posiphen (Buntanetap) target this element by stabilizing the IRP1-IRE interaction or mimicking its inhibitory effect (Annovis Bio, 2024). By reducing the total pool of APP available for proteolytic cleavage, these drugs aim to lower the levels of all Aβ isoforms and other toxic metabolites. This translational control strategy represents a novel approach to treating neurodegenerative diseases by addressing protein overproduction at the mRNA level.

Other names

APP 5'-UTR iron-responsive elementAPP IREAmyloid beta precursor protein mRNA 5'-UTR IREAPP 5'-UTR IRE

Small molecules bind to the 5'-UTR IRE of the APP mRNA, stabilizing the interaction between the IRE and Iron Regulatory Protein 1 (IRP1). This stabilization sterically hinders the recruitment of the 40S ribosomal subunit, thereby suppressing the translation of the amyloid precursor protein and reducing the production of neurotoxic amyloid-beta peptides.