BY THE OPTIMIST DAILY EDITORIAL TEAM
A quiet but powerful ally in the brain may be reshaping how we understand and treat neurodegenerative disease. New research from the Buck Institute for Research on Aging uncovered the overlooked role of glycogen, a stored form of sugar, in brain cells. The study suggests that this hidden fuel reserve may help guard against the toxic protein buildup linked to Alzheimer’s disease and other forms of cognitive decline.
“Stored glycogen doesn’t just sit there in the brain; it is involved in pathology,” said Pankaj Kapahi, a professor and senior scientist at the Buck Institute. This insight marks a major shift in how researchers view neuronal glycogen, which until recently was considered biologically irrelevant due to its minimal presence in the brain.
From fruit flies to human neurons
The team first made their discovery using fruit fly models of Alzheimer’s disease. When tau proteins, which are a major driver of neurodegeneration, accumulate in the brain, they appear to trap glycogen and prevent it from being broken down. This sugar buildup not only fuels further tau accumulation but also blocks neurons from coping with oxidative stress, a process that accelerates brain cell damage.
Crucially, the findings held true in human cell models. In neurons modeling tau buildup, the researchers observed similar patterns of glycogen entrapment and metabolic breakdown.
One enzyme, big potential
To interrupt this cycle, the scientists boosted levels of an enzyme called glycogen phosphorylase (GlyP), which jumpstarts the breakdown of glycogen. Once this metabolic logjam was cleared, neurons regained their ability to detoxify harmful molecules known as reactive oxygen species. “By increasing GlyP activity, the brain cells could better detoxify harmful reactive oxygen species, thereby reducing damage and even extending the lifespan of tauopathy model flies,” said lead researcher Sudipta Bar.
This process offers a compelling new target for treating dementia. It won’t tackle tau directly; rather, it will help neurons maintain their internal balance.
The GLP-1 connection
Another intriguing layer emerged when the researchers noticed that GlyP can be boosted naturally through fasting behaviors. The same mechanism may explain the growing evidence that GLP-1 receptor agonist drugs, commonly used for weight loss and diabetes, also offer protection against dementia.
“This work could explain why GLP-1 drugs, now widely used for weight loss, show promise against dementia, potentially by mimicking dietary restriction,” Kapahi noted.
Human neurons from patients with frontotemporal dementia (FTD) also responded to GlyP activation, reinforcing the potential for this approach to support brain health in multiple forms of neurodegeneration.
A new path to prevention
While much Alzheimer’s research has focused on halting or reversing tau and amyloid plaques, this study offers a more upstream solution: supporting the brain’s sugar metabolism. It opens up the possibility that existing drugs could be repurposed or optimized to prevent cognitive decline by activating the cell’s own detox systems.
“By discovering how neurons manage sugar, we may have unearthed a novel therapeutic strategy: one that targets the cell’s inner chemistry to fight age-related decline,” Kapahi said. “As we continue to age as a society, findings like these offer hope that better understanding—and perhaps rebalancing—our brain’s hidden sugar code could unlock powerful tools for combating dementia.”
Source study: Nature Metabolism— Neuronal glycogen breakdown mitigates tauopathy via pentose-phosphate-pathway-mediated oxidative stress reduction
