Inflammatory Markers and Cognitive Function in Aging
Summary
As the global population ages, chronic low-grade inflammation has emerged as a key factor influencing cognitive trajectories. Circulating inflammatory proteins, notably cytokines such as interleukin-6 (IL-6) and acute-phase reactants like C-reactive protein (CRP), interact with genetic predispositions to drive neurodegenerative processes. Age-related immune changes can prime microglia, compromise blood–brain barrier integrity and promote accumulation of amyloid and tau pathology. These mechanisms converge on synaptic dysfunction and region-specific brain atrophy, particularly within the hippocampus and temporal lobe, leading to declines in executive function, memory and language. Advances in high-throughput proteomics and genetic analyses have revealed novel peripheral biomarkers and molecular pathways that bridge systemic immunity and central nervous system health, opening avenues for early detection and targeted intervention.
Research from Nature Portfolio
Two large-scale proteomic studies have deepened our understanding of immune contributions to cognitive aging. One multicohort investigation used plasma proteomics to identify over two hundred immunologically relevant proteins differentially expressed following common infections; a subset of these predicted volumetric loss in temporal and limbic regions vulnerable to atrophy and correlated with established dementia biomarkers. Genetic variants altering expression of immune receptors, including integrin and toll-like receptor family members, were linked to accelerated brain volume decline. In a complementary analysis, high-throughput screening in a cohort of middle-aged and older adults uncovered dozens of circulating proteins associated with general cognitive performance. Enrichment of synaptic signalling and architecture pathways was observed, and Mendelian randomisation implicated specific protein mediators—such as viral entry factors—in Alzheimer’s disease susceptibility. These studies exemplify the integration of proteomic and genetic tools to map molecular drivers of age-related cognitive impairment.
Inflammatory Markers and Cognitive Function in Aging publication trend
The graph below shows the total number of articles in inflammatory markers and cognitive function in aging across all publications each year (not limited to Nature Index journals).
Technical terms
Cytokine: Small secreted protein mediating intercellular communication in immune and inflammatory responses.
Proteomic profiling: Large-scale analysis of the complete set of proteins in a biological sample to identify biomarkers or pathways.
Cerebrospinal fluid (CSF): Clear fluid surrounding the brain and spinal cord used to assess central nervous system biomarkers.
Mendelian randomisation: Analytical method leveraging genetic variants as proxies for modifiable exposures to infer causal relationships.
Apolipoprotein E genotype: Genetic variation in a lipid-transport protein with alleles that influence Alzheimer’s disease risk and modify inflammatory interactions.
Blood–brain barrier: Selective permeability barrier between the circulatory system and central nervous system that regulates molecular traffic.
References
- Proteomics identifies potential immunological drivers of postinfection brain atrophy and cognitive decline. Nature Aging (2024).
- Peripheral inflammatory biomarkers are associated with cognitive function and dementia: Framingham Heart Study Offspring cohort. Aging Cell (2023).
- Associations of neuroinflammatory IL-6 and IL-8 with brain atrophy, memory decline, and core AD biomarkers – in cognitively unimpaired older adults. Brain Behavior and Immunity (2023).
- Identification of circulating proteins associated with general cognitive function among middle-aged and older adults. Communications Biology (2023).
- Role of inflammatory markers in the diagnosis of vascular contributions to cognitive impairment and dementia: a systematic review and meta-analysis. GeroScience (2022).
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