Journal article
The effects of enalapril and losartan on mechanical ventilation-induced sympathoadrenal activation and oxidative stress in rats
The Journal of surgical research, Vol.188(2), pp.510-516
05/01/2014
DOI: 10.1016/j.jss.2014.01.054
PMID: 24630519
Abstract
Background: Mechanical ventilation (MV) is a method of maintaining appropriate gas exchange in patients who are unable to sustain adequate alveolar ventilation. While life-saving in the short-term, prolonged MV leads to altered cardiovascular responses and enhanced lung injury, but the exact mechanism is unknown. Therefore, we investigated the involvement of the sympathoadrenergic and renin-angiotensin system in MV-induced altered cardiovascular responses.
Methods: Sprague-Dawley rats were divided into six groups: (1) spontaneous breathing (SB); (2) SB + enalapril (100 mu g/kg intravenous infusion); (3) SB + losartan (100 mu g/kg infusion); (4) 12 h of MV; (5) MV + enalapril; and (6) MV + losartan. After the animals were sacrificed, blood and tissue samples were collected. Tyrosine hydroxylase, dopamine beta hydroxylase, and neuropeptide Y were measured in adrenal medulla and hypothalamus, whereas AT1 was measured in lung tissues by Western blot. Norepinephrine enzyme-linked immunosorbent assay and total antioxidant capacity were assayed in plasma.
Results: Our findings indicated that MV increases the sympathetic activation markers in adrenal medulla and hypothalamus. Moreover, oxidative stress was increased in lung and brain tissues. Treatment with enalapril or losartan reduced the lipid peroxidation in lung and brain tissues, while preserving the tissue glutathione content and plasma antioxidant capacity.
Conclusions: These data demonstrate that the inhibition of the renin-angiotensin system by enalapril or losartan may reduce the MV-induced increase in sympathetic activity markers and oxidative stress, and thus, may have a beneficial effect as adjuvant therapy. (C) 2014 Elsevier Inc. All rights reserved.
Details
- Title: Subtitle
- The effects of enalapril and losartan on mechanical ventilation-induced sympathoadrenal activation and oxidative stress in rats
- Creators
- Hale Zerrin Toklu - University of FloridaOh-Sung Kwon - University of FloridaYasemin Sakarya - University of FloridaScott K. Powers - University of FloridaKatherine Llinas - Veterans Health AdministrationNataliya Kirichenko - University of FloridaKurt J. Sollanek - University of FloridaMichael P. Wiggs - University of FloridaAshley J. Smuder - University of FloridaErin E. Talbert - University of FloridaPhilip J. Scarpace - University of FloridaNihal Tuemer - Malcom Randall Vet Affairs Med Ctr, Geriatr Res Educ & Clin Ctr, Gainesville, FL USA
- Resource Type
- Journal article
- Publication Details
- The Journal of surgical research, Vol.188(2), pp.510-516
- Publisher
- Elsevier
- DOI
- 10.1016/j.jss.2014.01.054
- PMID
- 24630519
- ISSN
- 0022-4804
- eISSN
- 1095-8673
- Number of pages
- 7
- Grant note
- Medical Research Service of the Department of Veterans Affairs; US Department of Veterans Affairs
- Language
- English
- Date published
- 05/01/2014
- Academic Unit
- Fraternal Order of Eagles Diabetes Research Center; Health and Human Physiology; Internal Medicine
- Record Identifier
- 9984259393402771
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