Inflammatory markers and cognitive function in middle-aged adults: the Whitehall II study

Area of Science:

• Neuroscience
• Immunology
• Epidemiology

Background:

• Inflammation plays a role in aging and cognitive function.
• Biomarkers like C-reactive protein (CRP) and interleukin-6 (IL-6) indicate systemic inflammation.
• Understanding the link between inflammation and cognition is crucial for public health.

Purpose of the Study:

• To investigate the association between inflammatory markers (CRP and IL-6) and cognitive performance in middle-aged adults.
• To determine if these markers predict cognitive decline over time.

Main Methods:

• Utilized data from the Whitehall II prospective occupational cohort study.
• Included over 4,200 male and female civil service employees.
• Measured inflammatory markers (CRP, IL-6) and cognitive function (memory, reasoning, vocabulary, fluency) over several years.

Main Results:

• Elevated CRP and IL-6 levels were associated with lower cognitive performance in inductive reasoning, vocabulary, and semantic fluency after adjusting for covariates.
• Associations were stronger in men than in women.
• No significant relationship was found between inflammatory markers and cognitive decline.

Conclusions:

• Raised inflammatory marker levels in midlife are moderately associated with poorer cognitive status.
• Inflammation appears to have a limited role in predicting cognitive decline in this population.