Study Shows How Diet Can Influence Brain Health as We Age
As we age, our brains undergo changes that make them more susceptible to disease. A recent study conducted by researchers from the Leibniz Institute on Aging – Fritz Lipmann Institute in Germany has shed light on these changes and how they can be influenced by diet.
The study, which utilized mass spectrometry to analyze brain proteins in young and old mice, focused on a process called ubiquitylation. Ubiquitylation involves adding chemical tags to proteins to signal their degradation or alteration. In older mice, researchers observed an accumulation of these tags on certain proteins, indicating a disruption in protein management.
According to molecular biologist Alessandro Ori, aging leads to fundamental changes in how brain proteins are labeled chemically. The ubiquitylation process acts as a molecular switch, determining the fate of proteins in the brain.
Further experiments on human neurons derived from stem cells revealed that a significant portion of the protein tag accumulation in aging brains was due to a slowdown in the proteasome, the system responsible for protein recycling.
While previous studies have shown that protein management becomes less efficient with age, this research provides a detailed link between ubiquitylation and protein tagging. Ori explained that the finely tuned system becomes imbalanced with age, leading to the accumulation and loss of tags on proteins.
In a dietary intervention study, older mice were placed on a calorie-restricted diet for four weeks before being returned to a normal diet. The researchers observed that for some proteins, the dietary change restored the chemical tagging to levels seen in younger animals.
Although the underlying mechanisms were not fully explored, the findings suggest that diet can modulate protein tagging in the brain, offering potential benefits for brain health in old age.
While the study has not been tested in humans yet, it provides valuable insights into the molecular processes that occur in the aging brain. Understanding these processes could lead to improved treatments for conditions like Alzheimer’s disease, where protein balance is crucial.
Ori emphasized that diet can still have a significant impact on brain processes in old age, although its effects may vary across different aging processes in the brain. The research has been published in Nature Communications.
