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Oxidative Stress Is Associated With Increased Pulmonary Artery Systolic Pressure in Humans

Ghasemzadeh, N; Patel, RS; Eapen, DJ; Veledar, E; Al Kassem, H; Manocha, P; Khayata, M; ... Quyyumi, AA; + view all (2014) Oxidative Stress Is Associated With Increased Pulmonary Artery Systolic Pressure in Humans. Hypertension , 63 (6) pp. 1270-1275. 10.1161/HYPERTENSIONAHA.113.02360. Green open access

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Abstract

Oxidative stress contributes to the development of pulmonary hypertension in experimental models, but this association in humans is unknown. We investigated the relationship between pulmonary artery systolic pressure measured by echocardiography and plasma aminothiol oxidative stress markers, with the hypothesis that oxidative stress will be higher in those with pulmonary hypertension. A group of 347 patients aged 65±12 years from the Emory Cardiovascular Biobank underwent echocardiographic assessment of left ventricular ejection fraction and pulmonary artery systolic pressure. Plasma aminothiols, cysteine, its oxidized form, cystine, glutathione, and its oxidized disulphide were measured and the redox potentials (Eh) of cysteine/cystine and glutathione/oxidized glutathione couples were calculated. Non-normally distributed variables were log transformed (Ln). Univariate predictors of pulmonary artery systolic pressure included age (P<0.001), sex (P=0.002), mitral regurgitation (P<0.001), left ventricular ejection fraction (P<0.001), left atrial size (P<0.001), diabetes mellitus (P=0.03), plasma Ln cystine (β=9.53; P<0.001), Ln glutathione (β=−5.4; P=0.002), and Eh glutathione (β=0.21; P=0.001). A multivariate linear regression model adjusting for all confounding variables demonstrated that Ln cystine (β=6.56; P=0.007), mitral regurgitation (β=4.52; P<0.001), statin use (β=−3.39; P=0.03), left ventricular ejection fraction (β=−0.26; P=0.003), and age (β=0.17; P=0.003) were independent predictors of pulmonary artery systolic pressure. For each 1% increase in plasma cystine, pulmonary artery systolic pressure increased by 16%. This association persisted in the subgroup with preserved left ventricular ejection fraction (≥50%) and no significant mitral regurgitation. Whether treatment of oxidative stress will improve pulmonary hypertension requires further study.

Type: Article
Title: Oxidative Stress Is Associated With Increased Pulmonary Artery Systolic Pressure in Humans
Open access status: An open access version is available from UCL Discovery
DOI: 10.1161/HYPERTENSIONAHA.113.02360
Publisher version: http://doi.org/10.1161/HYPERTENSIONAHA.113.02360
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Life Sciences & Biomedicine, Peripheral Vascular Disease, Cardiovascular System & Cardiology, PERIPHERAL VASCULAR DISEASE, cystine, hypertension, pulmonary, oxidative stress, TRANSGENIC (MREN2)27 RAT, HUMAN PLASMA, DOPPLER-ECHOCARDIOGRAPHY, ANTIOXIDANT THERAPY, LIPID-PEROXIDATION, METABOLIC SYNDROME, HEALTHY-ADULTS, REDOX STATE, HYPERTENSION, SUPEROXIDE
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Cardiovascular Science
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Cardiovascular Science > Population Science and Experimental Medicine
URI: https://discovery.ucl.ac.uk/id/eprint/1424808
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