Cerebrospinal Fluid Inflammatory Cytokine Aberrations in Alzheimer's Disease, Parkinson's Disease and Amyotrophic Lateral Sclerosis: A Systematic Review and Meta-Analysis.
Level 3 - non-randomized controlled study
Systematic review and meta-analysis of observational case-control studies
PubMed 30283455 · doi:10.3389/fimmu.2018.02122
What was done
A systematic review and random-effects meta-analysis of studies indexed in PubMed and Web of Science was conducted to evaluate cerebrospinal fluid (CSF) inflammatory cytokine levels in patients with Alzheimer's disease (AD), Parkinson's disease (PD), and amyotrophic lateral sclerosis (ALS) compared to controls. The meta-analysis included 71 articles with a total of 2,629 patients and 2,049 controls.
What was found
The abstract reports statistically significant increases without numerical effect sizes, variance estimates, or p-values. Random-effects meta-analysis demonstrated that: - AD patients had significantly elevated CSF levels of TGF-β, MCP-1, and YKL-40 compared to controls. - PD patients had significantly heightened CSF levels of TGF-β1, IL-6, and IL-1β. - ALS patients had significantly increased CSF levels of G-CSF, IL-2, IL-15, IL-17, MCP-1, MIP-1α, TNF-α, and VEGF.
Why it matters
This meta-analysis synthesizes clinical evidence demonstrating that neurodegenerative disorders exhibit unique central nervous system inflammatory cytokine profiles, highlighting candidate CSF biomarkers for differential diagnosis and disease monitoring.
Limits
The abstract reports no numerical effect sizes, confidence intervals, or measures of between-study heterogeneity. As a synthesis of observational case-control data, it cannot establish causality or determine whether these cytokine aberrations precede neurodegeneration or represent secondary reactive inflammation. Potential confounders such as assay type, disease duration, severity, and patient medications are not described.
Cited by
- supports Patients with Parkinson's disease show elevated levels of pro-inflammatory cytokines such as TNF-alpha and IL-6.