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Serum methylarginines and incident depression in a cohort of older adults

McEvoy, Mark and Schofield, Peter W. and Wayne, Smith and Kingsley, Agho and Mangoni, Arduino A. and Soiza, Roy L. and Peel, Roseanne and Hancock, Stephen J. and Kelly, Brian and Inder, Kerry and Carru, Ciriaco and Zinellu, Angelo and Attia, John R. (2013) Serum methylarginines and incident depression in a cohort of older adults. Journal of Affective Disorders, Vol. 151 (2), p. 493-499. ISSN 0165-0327. eISSN 1573-2517. Article.

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DOI: 10.1016/j.jad.2013.06.033

Abstract

Background: Methylarginines are endogenous nitric oxide synthase inhibitors that have been implicated in depression. This study measured serum concentrations of l-arginine, asymmetric (ADMA) and symmetric (SDMA) dimethylarginine in a representative sample of older community-dwelling adults and determined their association with incident depression over 6-years of follow-up.
Methods: Data on clinical, lifestyle, and demographic characteristics, methylated arginines, and l-arginine (measured using LC–MS/MS) were collected from a population-based sample of older Australian adults (Median age=64 years; IQR=60–70) from the Hunter Community Study. Clinical depression was defined as a Centre for Epidemiological Studies Depression Scale (CES-D) score ≥16 or use of antidepressant medications.
Results: In adjusted analyses ADMA (Q3), SDMA (Q2), l-arginine (Q2), gender, and asthma remained statistically significant predictors of incident depression at follow-up. Quartile 3 of ADMA concentration was associated with 3.5 times the odds of developing depression compared with Q1 (OR=3.54; 95% CI: 1.25–9.99).
Limitations: Limitations of our study include the use of a subjective self-reported questionnaire tool using a dichotomous cut-off, together with use of antidepressant medications, as proxies for clinical depression. Moreover, similarly to most population studies on methylated arginines, the measurement of ADMA and SDMA from blood does not necessarily reflect intracellular concentrations of these compounds. Finally, there were no measures of nitric oxide metabolites to determine if these levels were altered in the presence of elevated methylarginines and depression.
Conclusions: After adjusting for clinical, demographic, biochemical, and pharmacological confounders, higher serum ADMA was independently associated with incident depression at 6-years follow-up.

Item Type:Article
ID Code:9778
Status:Published
Refereed:Yes
Uncontrolled Keywords:Methylarginines, depression, cohort study
Subjects:Area 05 - Scienze biologiche > BIO/12 Biochimica clinica e biologia molecolare clinica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze Biomediche
Publisher:Elsevier
ISSN:0165-0327
eISSN:1573-2517
Deposited On:02 May 2014 12:13

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