Homocysteine: a marker for cognitive performance? A longitudinal follow-up study

Area of Science:

• Neuroscience
• Gerontology
• Biochemistry

Background:

• Cognitive decline is a significant concern in aging populations.
• Homocysteine, vitamin B12, and folic acid are implicated in neurological health.
• Understanding risk factors for cognitive impairment is crucial for developing interventions.

Purpose of the Study:

• To investigate the association between elevated total serum homocysteine and cognitive decline.
• To compare the relationship between cognition and homocysteine, vitamin B12, or folic acid levels.
• To assess cognitive performance changes over a six-year period in relation to these biomarkers.

Main Methods:

• Prospective study of 144 healthy aging individuals (aged 30-80 years).
• Cognitive function assessed at baseline and after six years using tests for cognitive speed, attention, information processing, and verbal learning/memory.
• Serum concentrations of homocysteine, folic acid, and vitamin B12 were measured.

Main Results:

• Elevated homocysteine concentrations showed a negative correlation with cognitive performance on verbal learning tests at baseline, independent of other factors.
• Baseline homocysteine levels were negatively associated with performance on attention/information processing and verbal learning tests throughout the six-year follow-up.
• Folic acid showed a minor correlation with delayed recall at baseline; vitamin B12 showed no significant correlation with cognitive measures.

Conclusions:

• Elevated serum homocysteine is associated with sustained lower cognitive performance in a normal aging population.
• Vitamin B12 and folic acid appear to have a minimal role in cognitive function within this cohort.
• Homocysteine may represent a modifiable risk factor for cognitive decline in aging individuals.