Brain Protein Decline Linked to Aging, With Reversal Possible in Mice
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A decline in a key brain protein called Menin is linked to multiple signs of aging in mice, from memory loss to thinning skin. Restoring Menin levels in elderly mice reversed many of these age-related changes. The research points to the hypothalamus as a central regulator of systemic aging.
Facts First
- Menin protein levels drop sharply in the mouse hypothalamus with age, specifically in neurons linked to metabolism and aging.
- Reducing Menin activity in mice triggered systemic aging signs, including brain inflammation, memory problems, and shorter lifespan.
- Restoring Menin in elderly mice reversed multiple aging markers, improving cognition, balance, skin, and bone density.
- The Menin decline reduces D-serine, a neurotransmitter important for learning and memory.
- D-serine supplementation improved cognition in older mice but did not reverse physical aging signs like skin and bone changes.
What Happened
Research led by Lige Leng and colleagues at Xiamen University found that levels of the Menin protein drop sharply in the hypothalamus of aging mice. This decline occurred specifically in neurons of the ventromedial hypothalamus (VMH), a region linked to metabolism and systemic aging, but not in support cells like astrocytes or microglia. When researchers engineered mice to have reduced Menin activity, the animals developed increased brain inflammation, memory problems, thinning skin, lower bone mass, impaired balance, and a shorter lifespan. The study also found that falling Menin levels led to a drop in D-serine, a neurotransmitter important for learning and memory, due to reduced activity of a Menin-regulated enzyme.
Why this Matters to You
This research identifies a specific biological mechanism in the brain that appears to coordinate multiple signs of aging throughout the body. While the study was conducted in mice, it suggests that targeting a single protein pathway could one day lead to therapies addressing a range of age-related conditions simultaneously, from cognitive decline to bone loss. The finding that D-serine supplementation improved cognitive performance in older mice points to a potential near-term avenue for supporting brain health, as D-serine is found in foods like soybeans, eggs, fish, and nuts and is available as a dietary supplement.
What's Next
The researchers delivered the Menin gene directly into the hypothalamus of 20-month-old mice, which is roughly equivalent to late-life aging in humans. After 30 days, these elderly mice showed improvements in learning, memory, balance, skin thickness, and bone density, accompanied by increased D-serine levels in the hippocampus. This demonstrates that reversing the Menin decline may be possible. Further research is needed to understand if similar mechanisms operate in humans and to develop safe methods for influencing this pathway. The study adds to growing evidence, including a 2024 paper in Nature Communications, that the hypothalamus plays a central role in aging.