Brain gene shields memory in aging mice by managing fat
Why do some people stay sharp as they age while others lose their memory? A gene active in a key brain region offers a clue, at least in mice.
Researchers studying memory and aging in mice identified a gene called PLA2G2F as a protective factor against cognitive decline. The gene encodes a protein involved in lipid metabolism (fat processing) in the hippocampus, the brain region central to memory formation. The study was published in Nature Neuroscience.
Fat accumulation in aging brain cells
PLA2G2F expression naturally increases as mice age, suggesting the body deploys it as a compensatory response to emerging cellular damage. When the researchers deleted the gene in specific hippocampal neurons, called dentate granule cells, the consequences of aging worsened. Mice lost synaptic connections more rapidly, accumulated lipid droplets within brain cells, and showed elevated inflammation in microglia, the brain’s resident immune cells.
The reverse was also true. Artificially boosting PLA2G2F expression in aged mice helped preserve memory. Lipid metabolism, the cellular process of converting and transporting fats, appears to be the key mechanism. When it breaks down, lipid droplets and cholesterol esters accumulate in microglia. That accumulation promotes inflammation and damages the environment surrounding neurons.
Human relevance still being explored
The researchers also found correlations between higher PLA2G2F expression and better cognitive resilience in human datasets. However, these are associations, not evidence from a human intervention. Whether boosting this gene or its protein product would produce similar benefits in people remains unknown. For now, this is a mouse study. Nevertheless, it identifies lipid metabolism in the hippocampus as a potentially targetable pathway for slowing memory decline in old age.
Search terms: hippocampal lipid dysregulation aging, microglial neuroinflammation cognition, neuronal lipid metabolism memory