What if the key to protecting the brain isn’t found solely in neurons, but in the body’s broader metabolic landscape? A series of recent studies suggests exactly that. In aging mice, altering growth hormone signaling specifically in fat tissue reduced neuroinflammation, tau-related changes, and neuronal loss—while preserving memory and learning. In a separate Alzheimer’s model, researchers identified early increases in glycolysis-related genes in the hippocampus before visible tau tangles formed, pointing to energy imbalance as a potential upstream driver of neurodegeneration rather than a downstream consequence.
Even in stroke-like injury, metabolism appears to play a decisive role. In a rat model of ischemia-reperfusion injury, acupuncture reduced brain damage and improved neurological function by restoring iron balance and limiting ferroptosis, a destructive form of cell death linked to oxidative stress. Together, these findings highlight metabolism as a powerful regulator of brain aging, cognitive decline, and recovery after injury—suggesting that future strategies to protect the brain may need to think beyond the brain itself.
1. Adipose-Specific GHR Deletion Attenuates Brain Aging and Cognitive Decline in Aged Mice
Deleting the growth hormone receptor specifically in adipose tissue reduced neuronal loss, neuroinflammation, cellular senescence, and tau phosphorylation in aged mice. Synaptic integrity and neuronal excitability were preserved, leading to significant improvements in memory and learning. The findings position adipose GH signaling as a powerful peripheral regulator of brain aging and a promising target to combat age-related cognitive decline.
2. Spatiotemporal transcriptomic profiling reveals upregulation of glycolysis pathway genes before overt tauopathy in the PS19 mouse model
Spatial transcriptomics in the PS19 mouse reveals that glycolysis pathway genes—particularly Pgk1—are upregulated in the hippocampal CA3 region before overt tau tangle formation. These early metabolic shifts, alongside emerging glial activation, suggest that energy dysregulation is an upstream event in tau-driven neurodegeneration, highlighting metabolism as a potential early intervention target in Alzheimer’s disease and related tauopathies.
3. Acupuncture Alleviates Cerebral Ischemia-Reperfusion Injury by Inhibiting Ferroptosis Through the IRP2/IRE Pathway
In a rat model of Cerebral ischemia–reperfusion injury, acupuncture reduced infarct volume, improved neurological scores, and preserved mitochondrial integrity. Mechanistically, it suppressed neuronal ferroptosis by restoring iron homeostasis through the IRP2/IRE pathway, lowering Fe²⁺ overload and oxidative stress while enhancing GPX4 and GSH activity.
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