| Protein | Iron regulatory protein 2 (IRP2 / IREB2) |
|---|---|
| Encoded by | [IREB2](/genes/ireb2) |
| Core role | Post-transcriptional control of iron uptake, storage, and utilization genes |
| Primary mechanism | Binding iron-responsive elements (IREs) in target mRNAs |
| Key disease links | [Parkinson's disease](/diseases/parkinsons-disease), [Alzheimer's disease](/diseases/alzheimers-disease), iron-dysregulation phenotypes |
IREB2 (IRP2) is a central RNA-binding regulator of intracellular iron handling, coordinating transcripts for transferrin receptor, ferritin, and related iron-homeostasis programs.[1][2] In neurons and glia, IRP2 helps prevent both iron starvation and iron-overload toxicity by adapting translation and stability of iron-responsive transcripts.[1:1][3]
IRP2 functions as a sensor-effector protein whose RNA-binding state is controlled by iron-dependent proteostatic regulation. Under low iron, IRP2 binds IRE motifs and shifts expression toward iron acquisition; under high iron, IRP2 is destabilized to reduce uptake pressure.[1:2][2:1]
Physiologic IRP2 activity supports mitochondrial respiration, neurotransmitter synthesis, and oxidative-defense capacity by maintaining adequate but non-toxic labile iron pools.[3:1][4] This is particularly important in metabolically active neuronal populations vulnerable to redox imbalance.
Disruption of IRP2 biology causes strong neurological phenotypes in experimental systems and is linked to disease-relevant iron dyshomeostasis pathways in PD-spectrum biology.[5][6] Mechanistic studies place IRP2 at the intersection of iron overload, lipid peroxidation, and ferroptotic susceptibility, making it relevant to progression rather than just disease initiation.[6:1][7]
Current translational directions include:
Because systemic iron physiology is tightly coupled to immune and erythroid biology, therapeutic development requires biomarker-guided titration rather than broad iron depletion.
Hentze MW, Muckenthaler MU, Andrews NC. Balancing acts: molecular control of mammalian iron metabolism. Cell Metab. 2006. ↩︎ ↩︎ ↩︎
Muckenthaler MU, Galy B, Hentze MW. Systemic iron homeostasis and the iron-responsive element/iron-regulatory protein (IRE/IRP) regulatory network. Physiol Rev. 2007. ↩︎ ↩︎
Rouault TA. The role of iron regulatory proteins in mammalian iron homeostasis and disease. Nat Rev Neurosci. 2006. ↩︎ ↩︎
Hentze MW, Muckenthaler MU, Galy B, Camaschella C. Two to tango: regulation of Mammalian iron metabolism. Cell. 2010. ↩︎
Ghosh MC, Tong WH, Zhang D, et al. Tempol-mediated activation of latent iron regulatory protein activity prevents symptoms of neurodegenerative disease in IRP2 knockout mice. Proc Natl Acad Sci U S A. 2008. ↩︎ ↩︎
Wang Y, Zhao X, Guo Y, et al. Deubiquitylase OTUD3 prevents Parkinson's disease through stabilizing iron regulatory protein 2. Autophagy. 2022. ↩︎ ↩︎ ↩︎
Yang P, Xiang Q, Li X, et al. The involvement of IRP2-induced ferroptosis through the p53-SLC7A11-ALOX12 pathway in Parkinson's disease. Neurosci Bull. 2024. ↩︎
Pezzuto F, Buonaguro FM, Tornesello ML. Iron-responsive element binding protein 2 in neurodegeneration. Mol Neurobiol. 2022. ↩︎