Aging & Strength: Brain Region Discovery | SciTechDaily
Researchers at the University of California, San Francisco (UCSF) have identified a protein, FTL1, that, when reduced, can reverse memory loss in mice, according to a study published in August 2025. The findings suggest a potential pathway for reversing cognitive decline, rather than simply slowing it down.
The research, focused on the hippocampus – the brain region critical for learning and memory – revealed that older mice exhibited higher levels of FTL1 compared to younger mice. This increase in FTL1 correlated with fewer connections between brain cells and diminished cognitive abilities. Conversely, when researchers artificially increased FTL1 levels in young mice, their brains and behavior began to mimic those of older mice, demonstrating the protein’s influence on brain aging.
Experiments conducted in vitro showed that nerve cells engineered to produce high levels of FTL1 developed simpler neurite structures – possessing only one branch – compared to the more complex, branching neurites characteristic of healthy nerve cells. However, reducing FTL1 levels in the hippocampus of older mice led to a restoration of youthful brain function. These mice exhibited increased connections between nerve cells and demonstrated improved performance on memory tests.
The discovery of FTL1’s role coincides with broader research into the genetics of brain aging. A separate study led by Nicholas Kim at the University of Southern California (USC) Viterbi’s Alfred E. Mann Department of Biomedical Engineering, published in the journal GeroScience, has mapped the genetics of how individual brain regions age. Kim’s research moves beyond assigning a single “brain age” score, instead pinpointing specific genes that drive aging in distinct brain regions, including those most affected by Alzheimer’s and dementia. Kim’s work was motivated by his personal experience caring for his grandfather, who suffered from Alzheimer’s disease.
Although previous studies have estimated “brain age” based on MRI scans, the USC research delves into the underlying genetic mechanisms. A discrepancy between chronological age and “brain age” as revealed by MRI can indicate an elevated risk of cognitive decline. The USC team’s approach aims to identify the specific genetic factors contributing to this accelerated aging in different brain regions.
Recent research also highlights the connection between physical strength and brain activity, identifying a previously overlooked brain signal linked to both. This suggests a potential early indicator of frailty and physical decline, though the specific brain region involved has not been publicly disclosed.