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Title: Human Plasma Metabolomics in Age-Related Macular Degeneration: Meta-Analysis of Two Cohorts
Authors: Laíns, Inês 
Chung, Wonil
Kelly, Rachel S.
Gil, João 
Marques, Marco 
Barreto, Patrícia 
Murta, Joaquim N. 
Kim, Ivana K.
Vavvas, Demetrios G.
Miller, John B.
Silva, Rufino 
Lasky-Su, Jessica
Liang, Liming
Miller, Joan W.
Husain, Deeba
Keywords: age-related macular degeneration; mass spectrometry; metabolomics
Issue Date: 2-Jul-2019
Publisher: MDPI
Project: Miller Retina Research Fund (Mass. Eye and Ear), Champalimaud Vision Award (JWM), unrestricted departmental Grant from Research to Prevent Blindness, Portuguese Foundation for Science and Technology/Harvard Medical School Portugal Program (HMSP-ICJ/006/2013), Commonwealth Unrestricted Grant for Eye Research 
Serial title, monograph or event: Metabolites
Volume: 9
Issue: 7
Abstract: The pathogenesis of age-related macular degeneration (AMD), a leading cause of blindness worldwide, remains only partially understood. This has led to the current lack of accessible and reliable biofluid biomarkers for diagnosis and prognosis, and absence of treatments for dry AMD. This study aimed to assess the plasma metabolomic profiles of AMD and its severity stages with the ultimate goal of contributing to addressing these needs. We recruited two cohorts: Boston, United States (n = 196) and Coimbra, Portugal (n = 295). Fasting blood samples were analyzed using ultra-high performance liquid chromatography mass spectrometry. For each cohort, we compared plasma metabolites of AMD patients versus controls (logistic regression), and across disease stages (permutation-based cumulative logistic regression considering both eyes). Meta-analyses were then used to combine results from the two cohorts. Our results revealed that 28 metabolites differed significantly between AMD patients versus controls (false discovery rate (FDR) q-value: 4.1 × 10-2-1.8 × 10-5), and 67 across disease stages (FDR q-value: 4.5 × 10-2-1.7 × 10-4). Pathway analysis showed significant enrichment of glycerophospholipid, purine, taurine and hypotaurine, and nitrogen metabolism (p-value ≤ 0.04). In conclusion, our findings support that AMD patients present distinct plasma metabolomic profiles, which vary with disease severity. This work contributes to the understanding of AMD pathophysiology, and can be the basis of future biomarkers and precision medicine for this blinding condition.
ISSN: 2218-1989
DOI: 10.3390/metabo9070127
Rights: openAccess
Appears in Collections:FMUC Medicina - Artigos em Revistas Internacionais

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