Fructose Intake Is Associated with Brain Metabolic Reprogramming and Exacerbation of Alzheimer-like Alterations in...

Area of Science:

• Neuroscience
• Metabolic Research
• Alzheimer's Disease Pathogenesis

Background:

• Metabolic dysfunction is increasingly linked to Alzheimer's disease (AD).
• The specific effects of dietary fructose on brain function in AD are not well understood.
• Fructose is a common dietary component that causes systemic metabolic changes.

Purpose of the Study:

• To investigate the impact of short-term fructose consumption on metabolism, brain glucose handling, and cognition in a mouse model of AD.
• To explore the relationship between fructose intake, metabolic syndrome markers, and Alzheimer's-like pathology.

Main Methods:

• APP/PS1 transgenic mice were given 15% fructose in drinking water for eight weeks.
• Systemic metabolic parameters (fasting glucose, lipids) were measured.
• Cerebral glucose utilization, amyloid-beta (Aβ42) accumulation, cognitive function, and neuroinflammation markers were assessed.

Main Results:

• Fructose consumption led to metabolic syndrome indicators, including hyperglycemia and dyslipidemia.
• Reduced brain glucose metabolism and increased Aβ42 deposition were observed in fructose-fed mice.
• Cognitive performance declined, and neuroinflammatory markers were elevated.

Conclusions:

• Dietary fructose exacerbates Alzheimer's-like pathology by disrupting brain glucose metabolism and promoting neuroinflammation.
• Fructose intake may represent a modifiable risk factor contributing to Alzheimer's disease vulnerability.
• These findings highlight the link between systemic metabolic health and brain function in AD.