Abstract
Inadequate substrate availability and increased nitric oxide synthase inhibitor levels attenuate nitric oxide (NO) synthesis, whereas increased vascular oxidative stress may lead to inactivation of NO. We compared markers of NO synthesis capacity and oxidative stress in a bi-ethnic male population. Inter-relationships of ambulatory blood pressure and urinary albumin-to-creatinine ratio with NO synthesis capacity and oxidative stress markers were investigated. NO synthesis capacity markers (L-arginine, asymmetric dimethylarginine (ADMA), and symmetric dimethylarginine (SDMA)) and oxidative stress markers (serum peroxides, total glutathione, glutathione peroxidase (GPx), glutathione reductase (GR), superoxide dismutase (SOD), and catalase) were measured. Black men displayed higher blood pressure and albumin-to-creatinine ratio (all p < 0.001), while NO synthesis capacity was more favorable (higher L-arginine and lower ADMA (p ≤ 0.003)). Antioxidant enzyme activities were similar except for the redox status markers (GR activity and GR/GPx ratio), which were upregulated in black men (p < 0.001). In black men, ADMA was inversely related to GPx activity (R 2 = 0.15; β = −0.20; p = 0.050) and GPx/SOD ratio (R 2 = 0.24; β = −0.37; p < 0.001), but none of these markers related to blood pressure or albumin-to-creatinine ratio. In white men, albumin-to-creatinine ratio was positively associated with ADMA (R 2 = 0.18; β = 0.39; p < 0.001) while ADMA was inversely related to GR activity (R 2 = 0.26; β = −0.29; p = 0.002) and GR/GPx ratio (R 2 = 0.25; β = −0.28; p = 0.003). Black men with elevated blood pressure and albumin-to-creatinine ratio displayed a favorable NO synthesis capacity. This may be counteracted by increased inactivation of NO, although it was not linked to vascular or renal phenotypes. In white men, reduced NO synthesis capacity may lower NO bio-availability, thereby influencing the albumin-to-creatinine ratio.
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Acknowledgments
The SABPA study would not have been possible without the voluntary collaboration of the participants and the Department of Education, North-West Province, South Africa. We gratefully acknowledge the technical assistance of Mariola Kastner, Anna Steenpass, Mrs. Tina Scholtz, Dr. Szabolcs Péter, and Sr Chrissie Lessing. This study was supported by the National Research Foundation; the National Research Foundation Thuthuka (80643); the Medical Research Council, the North-West University, Potchefstroom; Roche Products (Pty) Ltd., South Africa, and the Metabolic Syndrome Institute, France.
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Mels, C.M.C., Huisman, H.W., Smith, W. et al. The relationship of nitric oxide synthesis capacity, oxidative stress, and albumin-to-creatinine ratio in black and white men: the SABPA study. AGE 38, 9 (2016). https://doi.org/10.1007/s11357-016-9873-6
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DOI: https://doi.org/10.1007/s11357-016-9873-6