The abstract is read at the publisher; the summary is JClub's.
In mouse dorsal root ganglion neurons and a streptozotocin model of diabetic neuropathy, GCN2 links mitochondrial redox stress to translational dysregulation and mechanical allodynia.
- Why it matters: Painful diabetic neuropathy is common, and although methylglyoxal (MGO) is strongly associated with it and activates the ISR, the molecular bridge to pain hypersensitivity was unclear.
- What they did: In human DRG-derived sensory neurons, MGO increased eIF2 phosphorylation and suppressed global translation, effects blocked by GCN2 inhibition; ribosome profiling in mouse DRG showed repression of electron transport chain mRNAs. MGO glycated mitochondrial complex I, raised the NADH/NAD+ ratio, and mitoLbNOX corrected this to prevent ISR activation; in vivo, GCN2 inhibition or conditional deletion attenuated mechanical allodynia and reduced TRPA1-agonist calcium influx.
- The result: Correcting mitochondrial redox imbalance with mitoLbNOX, or disrupting GCN2, prevented MGO-driven ISR activation and reduced streptozotocin-induced mechanical hypersensitivity, supporting GCN2 as a conserved driver of translational stress in diabetic pain.
The findingWhy it mattersWhat they didThe result
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