Blueberry supplementation enhances signaling and prevents behavioral deficits in an Alzheimer disease model.
Level 5 - mechanism / opinion, no new human data
Animal study using a transgenic mouse model.
PubMed 12793519 · doi:10.1080/1028415031000111282
What was done
APP + PS1 transgenic mice were fed a diet supplemented with blueberries starting at 4 months of age. At 12 months of age, behavioral performance was evaluated using the Y-maze task, alongside assessments of amyloid-beta burden, memory-associated neuronal signaling markers (such as extracellular signal-regulated kinase), and neutral sphingomyelin-specific phospholipase C activity.
What was found
Blueberry-supplemented transgenic mice showed no deficits in Y-maze performance at 12 months compared to expected impairment. Amyloid-beta burden remained unchanged. The abstract does not report specific quantitative values, sample sizes, or effect sizes, but notes blueberry-induced enhancements in extracellular signal-regulated kinase signaling and alterations in neutral sphingomyelin-specific phospholipase C activity.
Why it matters
This study demonstrates that dietary interventions can preserve cognitive-like behaviors in an Alzheimer's mouse model independent of changes in amyloid plaque accumulation.
Limits
The study was conducted entirely in a transgenic rodent model, which does not fully capture human Alzheimer's disease pathology or clinical progression. The abstract provides no sample sizes, numerical data, variance measures, or statistical test values.
Cited by
- contradicts Green tea extract and blueberry extract have been demonstrated to decrease beta-amyloid plaques.