SynthesisFrontiers in aging neuroscience2025
Association of brain-derived neurotrophic factor in blood and cerebrospinal fluid with Parkinson's disease and non-motor symptoms of Parkinson's disease: a systematic review and meta-analysis of 6655 participants.
Synthesis in Frontiers in aging neuroscience, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
4 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Traditional Chinese exercise for quality of life, cognition, sleep in Parkinson's disease: a systematic review and meta-analysis.Frontiers in psychology · 2026Pooled it
- Efficacy and safety of adjunctive acupuncture for depression and motor symptoms in Parkinson's disease: study protocol for a randomized controlled trial.Frontiers in psychiatry · 2026Article
- Synergy between stem cell therapy and brain-derived neurotrophic factor (BDNF) in Parkinson's disease: a mini-review of combined neuroregenerative strategies.Chinese neurosurgical journal · 2025Review
- Nomogram to predict 5-year global cognitive impairment inFrontiers in neuroscience · 2025Article
Corrections and comments
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Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Background: Brain-derived neurotrophic factor (BDNF) is essential for regulating neuronal proliferation and survival in neurodegenerative diseases, including Parkinson's disease (PD). However, Studies on BDNF levels in peripheral blood and cerebrospinal fluid (CSF) have inconsistent results. Therefore, this study aimed to examine BDNF levels in patients with PD and to explore their correlation with non-motor symptoms. Methods: Four databases (PubMed, Embase, Cochrane Library, and CNKI) were searched for eligible studies. The quality of the included studies was assessed using the Newcastle-Ottawa Scale (NOS). Standardized mean differences (SMDs) with 95% confidence intervals (CIs) were calculated using Stata version 14.0, applying either a fixed-effect or a random-effects model based on heterogeneity. Furthermore, subgroup analysis, meta-regression, and sensitivity analysis were employed to identify and analyze sources of heterogeneity. Publication bias was assessed using funnel plots and Egger's test. Results: A comprehensive systematic review and meta-analysis was conducted, encompassing 48 articles. A total of 38 studies, covering 2,589 patients with PD and 2,422 healthy controls, were analyzed, revealing significantly lower peripheral blood BDNF levels in PD patients compared to healthy controls (SMD = -1.037; 95% CI [-1.412, -0.662]; Conclusion: Reduced expression of BDNF is associated with both PD and its non-motor symptoms. Further research is needed to explore the potential of BDNF as a biomarker for non-motor symptoms of PD, particularly for cognitive impairment.
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Registered trials
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