Consume Less, Live Longer Cutting Back on Food Boosts Lifespan and Enhances Brain Health

In recent studies, scientists have made a significant breakthrough in understanding the relationship between dietary restriction, brain health, and aging. They pinpointed the OXR1 gene as a key player in extending lifespan and ensuring a healthy aging process, especially in response to dietary restriction.

This groundbreaking discovery emerged from extensive research involving fruit flies and human cells. It sheds light on the crucial role of the OXR1 gene in safeguarding neurons and preserving the function of the retromer complex. These findings offer new possibilities for developing therapies targeting age-related neurodegenerative diseases and promoting overall longevity.

Key Findings:

1. OXR1 Gene and Dietary Restriction: The OXR1 gene is essential for reaping the benefits of dietary restriction, particularly concerning brain health and aging.

2. Influence on the Retromer Complex: Research indicates that OXR1 influences the retromer complex, a crucial mechanism for recycling cellular proteins. This influence is vital for maintaining neuronal function and overall brain health.

3. Study on Fruit Flies and Human Cells: The research, conducted on both fruit flies and human cells, proposes potential new treatments for neurodegenerative diseases and strategies for healthy aging.

Source: Buck Institute

Calorie restriction is known to enhance health and increase lifespan, but the precise mechanisms, especially regarding brain protection, have remained elusive. Scientists at the Buck Institute have identified a gene called OXR1 as instrumental in the lifespan extension observed with dietary restriction, particularly in maintaining healthy brain aging.

Kenneth Wilson, Ph.D., a Buck postdoc and the study's first author, emphasized the importance of this gene in the brain: “When people restrict the amount of food that they eat, they typically think it might affect their digestive tract or fat buildup, but not necessarily about how it affects the brain.”

OXR1, according to Buck Professor Lisa Ellerby, Ph.D., co-senior author of the study, acts as a crucial factor in protecting the brain against aging and neurological diseases.

The research team also unraveled the cellular mechanism through which dietary restriction can slow aging and mitigate the progression of neurodegenerative diseases. By studying fruit flies and human cells, they identified potential therapeutic targets for both aging and age-related neurodegenerative diseases.

Buck Professor Pankaj Kapahi, Ph.D., co-senior author, explained: “We found a neuron-specific response that mediates the neuroprotection of dietary restriction. Strategies such as intermittent fasting or caloric restriction may enhance levels of this gene to mediate its protective effects.”

The team's exploration delved into the variability in responses to dietary restriction across individuals and tissues. By examining 200 strains of flies with different genetic backgrounds, they identified five genes, including OXR1, significantly affecting longevity under dietary restriction.

The study focused on the "mustard" gene (mtd) in fruit flies, which corresponds to "Oxidation Resistance 1" (OXR1) in humans and mice. This gene, crucial for protecting cells from oxidative damage, plays a pivotal role in brain aging and neurodegeneration.

The research uncovered that OXR1 influences the retromer, a complex essential for recycling cellular proteins and lipids. Dysfunction in the retromer has been linked to age-related neurodegenerative diseases like Alzheimer’s and Parkinson’s, which dietary restriction protects against.

In summary, the study emphasizes how dietary restriction slows brain aging by preserving retromer function through the action of OXR1. Wilson highlighted the impact of diet on gene expression: “By eating less, you are actually enhancing this mechanism of proteins being sorted properly in your cells, because your cells are enhancing the expression of OXR1.”

Boosting mtd in flies led to longer lifespans, hinting at the potential for excess expression of OXR1 in humans to extend lifespan. Eller by concluded: “Our next step is to identify specific compounds that increase the levels of OXR1 during aging to delay brain aging.”

In essence, this research reinforces the idea that what we eat can influence various processes in our body. Following a healthy diet, as suggested by Wilson, supports overall well-being, impacting more than meets the eye. The study involved various researchers at the Buck Institute, and funding was provided by the National Institutes of Health (NIH), the Larry L. Hillblom Foundation, and the National Centers of Competence in Research (NCCR).

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