Alzheimer's disease revisited.

Area of Science:

• Neuroscience
• Biochemistry
• Epidemiology

Background:

• Previous research suggested a link between essential fatty acid deficiency and sporadic Alzheimer's disease (AD).
• A recent study on dementia within the Rotterdam Study population supports this hypothesis.
• Aluminum is increasingly implicated as a potential pathogenic factor in AD.

Purpose of the Study:

• To explore the potential role of essential fatty acid deficiency in the etiology of sporadic Alzheimer's disease.
• To investigate the hypothesis that essential fatty acid deficiency may facilitate aluminum entry into the brain.
• To consider the contribution of hypomethylation, potentially due to S-adenosylmethionine deficiency, to neurodegenerative diseases.

Main Methods:

• Review of existing literature and previous research findings.
• Analysis of data from the Rotterdam Study concerning dementia and related factors.
• Hypothetical modeling of biochemical pathways involving essential fatty acids, aluminum, and methylation.

Main Results:

• The Rotterdam Study data reinforce the suggestion that essential fatty acid deficiency may be implicated in Alzheimer's disease etiology.
• It is hypothesized that this deficiency could enhance the brain's uptake of aluminum.
• A deficiency in S-adenosylmethionine, leading to hypomethylation, is also proposed as a potential etiological factor for Alzheimer's and Parkinson's diseases.

Conclusions:

• Essential fatty acid deficiency is a plausible contributing factor to sporadic Alzheimer's disease.
• This deficiency may play a role in facilitating aluminum's passage into the brain.
• Hypomethylation, linked to S-adenosylmethionine levels, warrants further investigation in neurodegenerative disease pathogenesis.