Cited by 24Pulmonary Hypertension Research and TreatmentsNitric Oxide and Endothelin EffectsCardiovascular and exercise physiology

Acute administration of l-arginine restores nitric oxide-mediated relaxation in isolated pulmonary arteries from pulmonary hypertensive exercise trained rats

Goret, Lucie, Tanguy, Stéphane, Guiraud, Isabelle, Dauzat, Michel, Obert, Philippe·2008·European Journal of Pharmacology

Abstract

Hypoxia-induced pulmonary hypertension is associated with an impairment of nitric oxide-mediated vasorelaxation in the pulmonary circulation that is not prevented by exercise training. The present study was designed to test the hypothesis that a decrease in l-arginine bioavailability could be involved in this blunted response to exercise training. Male Wistar rats were randomly assigned to 4 groups: normotensive sedentary, normotensive trained, pulmonary hypertensive sedentary, pulmonary hypertensive trained. Pulmonary hypertension was induced by chronic exposure to hypobaric hypoxia (PIO(2) approximately 90 mmHg). Endothelium-dependent vasorelaxation to acetylcholine (10(-8)-10(-4) M) with or without l-arginine (10(-3) M) and/or nitro-l-arginine methyl ester (5.10(-6) M) was assessed on isolated pulmonary arterial rings. Maximal relaxation to acetylcholine was impaired in both pulmonary hypertensive groups. Acute l-arginine supplementation improved acetylcholine-induced vasorelaxation in the pulmonary hypertensive trained rats (P<0.01), to the level obtained in the normotensive sedentary ones, but not in the pulmonary hypertensive sedentary rats. This improvement was abolished when nitro-l-arginine methyl ester was added to the organ bath and was accounted for by an increase in eNOS protein content. These results confirm that the potential beneficial effect of exercise on nitric oxide-mediated pulmonary artery vasorelaxation is partly blunted by deleterious effects of hypoxia on l-arginine bioavailability. Further studies are needed to evaluate the benefit of the combination of exercise training and l-arginine supplementation for the treatment of pulmonary hypertension.

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Crossref · 10.1016/j.ejphar.2007.11.037

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Authors
Goret, L., Tanguy, S., Guiraud, I., Dauzat, M., & Obert, P.
Affiliations
  • Université d'Avignon et des Pays de Vaucluse (FR)
  • Université Montpellier 1 (FR)
Corresponding author
Goret, Lucie
Venue
European Journal of Pharmacology
Publisher
Elsevier BV
Published
2008-02
Volume
581
Issue
1-2
Pages
148-156
ISSN
0014-2999 (ISSN-L)
OpenAlex
W2022666582
Cited by
24
References
35
Citations by year
2024: 2 · 2020: 2 · 2017: 1 · 2016: 1 · 2015: 1 · 2014: 2 · 2013: 3 · 2012: 6
FWCI
1.15
Type
journal article
Language
en
Open access
closed
Locations
  • European Journal of Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Funders
National Institutes of Health
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Pulmonary Hypertension Research and Treatments
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
Keywords
L-arginine, nitric oxide, pulmonary hypertension, exercise training, hypobaric hypoxia, pulmonary vasodilation, endothelium-dependent relaxation, nitric oxide synthase, L-NAME, acetylcholine
MeSH terms
Animals, Arginine, Hypertension, Pulmonary, Male, Nitric Oxide, Nitroprusside, Physical Conditioning, Animal, Pulmonary Artery, Vasodilation, Rats, Wistar, Rats, In Vitro Techniques

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