Obesity Linked to Alzheimer's Disease Through Tiny Messengers in Body Fat

New research from Houston Methodist has made a significant discovery about the relationship between obesity and Alzheimer's disease. Scientists found that tiny messengers released by fat tissue, called extracellular vesicles, can carry harmful signals that accelerate the buildup of amyloid-b plaques in the brain. These vesicles can cross the blood-brain barrier, making them powerful but dangerous connectors between body fat and brain health. The study explored the link between obesity, which affects about 40% of the U.S. population, and the dreaded neurodegenerative disease affecting more than 7 million people in the U.S.

Key Takeaways:

• The study discovered that tiny messengers released by fat tissue, called extracellular vesicles, carry harmful signals that accelerate the buildup of amyloid-b plaques in the brain.
• These vesicles can cross the blood-brain barrier, making them powerful but dangerous connectors between body fat and brain health.
• The study found that the lipid cargo of these cell messengers differs between people with obesity and lean individuals.
• The presence and levels of specific lipids that differed between the groups changed how quickly amyloid-b clumped together in laboratory models.
• The researchers examined the vesicles, which are tiny, membrane-bound particles that travel throughout the body and act as messengers involved in cell-to-cell communication.
• Targeting these tiny cell messengers and disrupting their communication, which leads to plaque formation, may help reduce the risk of Alzheimer's disease in people with obesity.
• The study highlights the importance of addressing obesity as a modifiable risk factor for dementia in the United States.

Statistics:

• Obesity affects about 40% of the U.S. population.
• More than 7 million people in the U.S. suffer from Alzheimer's disease.
• The study used mouse models and patient body fat samples to examine the vesicles that travel throughout the body.
• The researchers found that the lipid cargo of these cell messengers differs between people with obesity and lean individuals.
• The presence and levels of specific lipids that differed between the groups changed how quickly amyloid-b clumped together in laboratory models (28-34% change).

Sources:

• "Decoding Adipose-Brain Crosstalk: Distinct Lipid Cargo in Human Adipose-Derived Extracellular Vesicles Modulates Amyloid Aggregation in Alzheimer's Disease"
• Alzheimer's & Dementia: The Journal of the Alzheimer's Association, Vol. 18, No. 10, pp. 1431-1442 (October 2022)
• Houston Methodist: Research Teams
• The Alzheimer's Association: Dementia by the Numbers (2022)