Circulating cytokines and vascular dementia: A bi-directional Mendelian randomization study

Area of Science:

• Immunology
• Neuroscience
• Genetics

Background:

• Inflammatory responses are implicated in the pathogenesis of vascular dementia (VaD).
• Circulating cytokines play a crucial role in modulating immune and inflammatory processes.
• Understanding the immune system's involvement in VaD is essential for developing effective interventions.

Purpose of the Study:

• To comprehensively assess the bidirectional causal relationship between circulating cytokines and vascular dementia (VaD) using Mendelian randomization.
• To investigate whether genetic predisposition to specific circulating cytokine levels influences VaD risk.
• To determine if genetic risk for VaD affects circulating cytokine levels.

Main Methods:

• Employed Mendelian randomization (MR) analysis, a robust genetic epidemiological method.
• Utilized large-scale genome-wide association study (GWAS) data for 41 circulating cytokines and VaD.
• Applied inverse variance weighting (IVW) and other MR methods, including sensitivity analyses, to establish causality.

Main Results:

• Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) showed a protective association with VaD risk (OR: 0.74).
• Vascular dementia (VaD) was associated with increased levels of seven circulating cytokines: MIP-1β, IL-12p70, IL-17, IL-7, IFN-γ, G-CSF, and FGF-Basic.
• These associations suggest a complex interplay between specific cytokines and VaD development.

Conclusions:

• Circulating cytokines are significantly associated with vascular dementia (VaD).
• Specific cytokines may represent novel therapeutic targets for preventing or treating VaD.
• Further research is warranted to validate these findings and explore clinical applications.