ArticleAlzheimer's research & therapy2024
Neurodegenerative biomarkers in different chambers of the eye relative to plasma: an agreement validation study.
Article in Alzheimer's research & therapy, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
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Who cites it
13 citing papers in PubMed.
- Relating aqueous to vitreous humor proteomics for identification of reliable biomarkers in proliferative diabetic retinopathy.Scientific reports · 2026Article
- Neurofilaments in Tears as Early Biomarkers of Corneal Neurodegeneration in Diabetes Without Retinopathy.Biomarker insights · 2026Article
- Tau abnormalities and microglial remodeling in glaucoma: potential links to phagocytosis-related injury.Frontiers in neurology · 2026Review
- Correlations between amyloid-β peptide levels in aqueous humor and retinal thickness in patients with glaucoma.Scientific reports · 2025Article
- Review
- Cervical Oculopathy: The Cervical Spine Etiology of Visual Symptoms and Eye Diseases-A Hypothesis Exploring Mechanisms Linking the Neck and the Eye.Diagnostics (Basel, Switzerland) · 2025Article
- Elevated Neurodegeneration Markers in the Aqueous Humor of Primary Open Angle and Normal Tension Glaucoma Patients Correlate With Disease Severity.Investigative ophthalmology & visual science · 2025Article
- Expression of Reelin, Aβ1-42, Tau and FTH1 in Idiopathic Epiretinal Membranes: Exploring the Link Between Reelin and Neurodegenerative Biomarkers.Biomolecules · 2025Article
- The ocular surface tear film as a biomarker for systemic health.The ocular surface · 2025Review
- Three-Dimensional β-Amyloid Burden Correlation Between the Eye and Brain in Alzheimer's Disease Mice Using Light-Sheet Fluorescence Microscopy.Investigative ophthalmology & visual science · 2025Article
- Innovations in Alzheimer's disease diagnostic technologies: clinical prospects of novel biomarkers, multimodal integration, and non-invasive detection.Frontiers in neurology · 2025Review
- Tear-derived extracellular vesicles as diagnostic biomarkers for ocular and neurodegenerative diseases: opportunities and challenges.Extracellular vesicles and circulating nucleic acids · 2025Review
- Vitreous STMN2 levels reflect TDP-43-associated neurodegeneration in postmortem eyes and brains.Journal of Alzheimer's disease reportsArticle
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13 authors.
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Abstract
backgroundProtein biomarkers have been broadly investigated in cerebrospinal fluid and blood for the detection of neurodegenerative diseases, yet a clinically useful diagnostic test to detect early, pre-symptomatic Alzheimer's disease (AD) remains elusive. We conducted this study to quantify Aβ40, Aβ42, total Tau (t-Tau), hyperphosphorylated Tau (ptau181), glial fibrillary acidic protein (GFAP) and neurofilament light chain (NfL) in eye fluids relative to blood.
methodsIn this cross-sectional study we collected vitreous humor, aqueous humor, tear fluid and plasma in patients undergoing surgery for eye disease. All six biomarkers were quantitatively measured by digital immunoassay. Spearman and Bland-Altman correlation analyses were performed to assess the agreement of levels between ocular fluids and plasma.
resultsSeventy-nine adults underwent pars-plana vitrectomy in at least one eye. Of the 79, there were 77 vitreous, 67 blood, 56 tear fluid, and 51 aqueous samples. All six biomarkers were quantified in each bio-sample, except GFAP and NfL in tear fluid due to low sample volume. All six biomarkers were elevated in vitreous humor compared to plasma samples. T-Tau, ptau181, GFAP and NfL were higher in aqueous than in plasma, and t-Tau and ptau181 concentrations were higher in tear fluid than in plasma. Significant correlations were found between Aβ40 in plasma and tears (r = 0.5; p = 0.019), t-Tau in plasma and vitreous (r = 0.4; p = 0.004), NfL in plasma and vitreous (r = 0.3; p = 0.006) and plasma and aqueous (r = 0.5; p = 0.004). No significant associations were found for Aβ42, ptau181 and GFAP among ocular fluids relative to plasma. Bland-Altman analysis showed aqueous humor had the closest agreement to plasma across all biomarkers. Biomarker levels in ocular fluids revealed statistically significant associations between vitreous and aqueous for t-Tau (r = 0.5; p = 0.001), GFAP (r = 0.6; p < 0.001) and NfL (r = 0.7; p < 0.001).
conclusionAD biomarkers are detectable in greater quantities in eye fluids than in plasma and show correlations with levels in plasma. Future studies are needed to assess the utility of ocular fluid biomarkers as diagnostic and prognostic markers for AD, especially in those at risk with eye disease.
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