Low-dose angiotensin II supplementation restores flow-induced dilation mechanisms in cerebral arteries of Sprague-Dawley rats on a high salt diet.
Journal
Journal of hypertension
ISSN: 1473-5598
Titre abrégé: J Hypertens
Pays: Netherlands
ID NLM: 8306882
Informations de publication
Date de publication:
01 03 2022
01 03 2022
Historique:
pubmed:
1
12
2021
medline:
24
3
2022
entrez:
30
11
2021
Statut:
ppublish
Résumé
Salt-induced suppression of angiotensin II contributes to impaired endothelium-dependent vascular reactivity. The present study investigated the effect of chronic low-dose angiotensin II (ANG II) supplementation on the mechanisms of flow-induced dilation (FID) and oxidative stress at the cellular and molecular level in middle cerebral arteries (MCA) of male Sprague-Dawley rats fed high salt diet. Rats (10 weeks old) were randomly assigned to a low salt diet group (0.4% NaCl in rat chow); high salt diet group (7 days 4% NaCl in rat chow) or HS+ANG II group [7 days high salt diet with 3 days ANG II administration via osmotic minipumps (100 ng/kg per min on days 4-7)]. FID was determined in absence/presence of the NOS inhibitor L-NAME, the non-selective cyclooxygenase (COX-1,2) inhibitor indomethacin, a selective inhibitor of CYP450 epoxygenase activity (MS-PPOH) and the superoxide dismutase mimetic TEMPOL. Gene expression of antioxidative enzymes, and of genes and proteins involved in FID mechanisms were determined by RT-qPCR and western blot. Vascular nitric oxide and superoxide/reactive oxygen species levels were assessed by direct fluorescence. Serum systemic oxidative stress parameters were measured by spectrophotometry. Chronic low-dose ANG II supplementation in high salt fed rats restored FID of MCAs, which was nitric oxide, prostanoid and epoxyeicosatrienoic acid dependent. ANG II changed the protein/gene expression of COXs, HIF-1α and VEGF and significantly increased GPx4 and EC-SOD antioxidative enzyme expression, decreased systemic oxidative stress, decreased superoxide/ROS levels and increased nitric oxide bioavailability in the vascular wall. Physiological levels of circulating ANG II are crucial to maintain the HIF-1α dependent mechanisms of FID and vascular oxidative balance without affecting mean arterial pressure.
Identifiants
pubmed: 34845157
doi: 10.1097/HJH.0000000000003030
pii: 00004872-202203000-00005
doi:
Substances chimiques
Angiotensin II
11128-99-7
Sodium Chloride
451W47IQ8X
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
441-452Informations de copyright
Copyright © 2021 Wolters Kluwer Health, Inc. All rights reserved.
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