Chronic aldosterone administration causes Nox2-mediated increases in reactive oxygen species production and endothelial dysfunction in the cerebral circulation

Sophcoles Chrissobolis, Grant R Drummond, Frank M Faraci, Christopher G Sobey

Research output: Contribution to journalArticleResearchpeer-review

Abstract

OBJECTIVES: An elevated plasma aldosterone level is an independent cardiovascular risk factor. Although excess aldosterone promotes cardiovascular disease, no studies have examined the effect of increased plasma aldosterone on the cerebral circulation. A major source of vascular reactive oxygen species (ROS) during cardiovascular disease is the NADPH oxidases. Because Nox2-containing NADPH oxidase (Nox2 oxidase) is highly expressed in the cerebral endothelium, we postulated that it might contribute to ROS generation and vascular dysfunction in response to aldosterone. Here, we examined the effect of aldosterone and Nox2 oxidase on ROS production and endothelial dysfunction in the cerebral circulation, and whether the effects of aldosterone are exacerbated in aged mice. METHODS AND RESULTS: In adult (average age approximately 24-25 weeks) wild-type and Nox2-deficient (Nox2) mice, neither vehicle nor aldosterone (0.28 mg/kg per day for 14 days) affected blood pressure (measured using tail-cuff). By contrast, aldosterone treatment reduced dilation of the basilar artery (measured using myography) to the endothelium-dependent agonist acetylcholine in wild-type mice (P <0.05), but had no such effect in Nox2 mice (P > 0.05). Aldosterone increased basal and phorbol dibutyrate-stimulated superoxide production (measured using L-012-enhanced chemiluminesence) in cerebral arteries from wild-type but not from Nox2 mice. In aged wild-type mice (average age approximately 70 weeks), aldosterone treatment increased blood pressure, but had a similar effect on cerebral artery superoxide levels as in adult wild-type mice. CONCLUSION: These data indicate that Nox2 oxidase mediates aldosterone-induced increases in ROS production and endothelial dysfunction in cerebral arteries from adult mice independently of blood pressure changes. Aldosterone-induced hypertension is augmented during aging.
Original languageEnglish
Pages (from-to)1815 - 1821
Number of pages7
JournalJournal of Hypertension
Volume32
Issue number9
DOIs
Publication statusPublished - 2014

Cite this

@article{a484bf7aa41941ad8b78f949375319fe,
title = "Chronic aldosterone administration causes Nox2-mediated increases in reactive oxygen species production and endothelial dysfunction in the cerebral circulation",
abstract = "OBJECTIVES: An elevated plasma aldosterone level is an independent cardiovascular risk factor. Although excess aldosterone promotes cardiovascular disease, no studies have examined the effect of increased plasma aldosterone on the cerebral circulation. A major source of vascular reactive oxygen species (ROS) during cardiovascular disease is the NADPH oxidases. Because Nox2-containing NADPH oxidase (Nox2 oxidase) is highly expressed in the cerebral endothelium, we postulated that it might contribute to ROS generation and vascular dysfunction in response to aldosterone. Here, we examined the effect of aldosterone and Nox2 oxidase on ROS production and endothelial dysfunction in the cerebral circulation, and whether the effects of aldosterone are exacerbated in aged mice. METHODS AND RESULTS: In adult (average age approximately 24-25 weeks) wild-type and Nox2-deficient (Nox2) mice, neither vehicle nor aldosterone (0.28 mg/kg per day for 14 days) affected blood pressure (measured using tail-cuff). By contrast, aldosterone treatment reduced dilation of the basilar artery (measured using myography) to the endothelium-dependent agonist acetylcholine in wild-type mice (P <0.05), but had no such effect in Nox2 mice (P > 0.05). Aldosterone increased basal and phorbol dibutyrate-stimulated superoxide production (measured using L-012-enhanced chemiluminesence) in cerebral arteries from wild-type but not from Nox2 mice. In aged wild-type mice (average age approximately 70 weeks), aldosterone treatment increased blood pressure, but had a similar effect on cerebral artery superoxide levels as in adult wild-type mice. CONCLUSION: These data indicate that Nox2 oxidase mediates aldosterone-induced increases in ROS production and endothelial dysfunction in cerebral arteries from adult mice independently of blood pressure changes. Aldosterone-induced hypertension is augmented during aging.",
author = "Sophcoles Chrissobolis and Drummond, {Grant R} and Faraci, {Frank M} and Sobey, {Christopher G}",
year = "2014",
doi = "10.1097/HJH.0000000000000259",
language = "English",
volume = "32",
pages = "1815 -- 1821",
journal = "Journal of Hypertension",
issn = "0263-6352",
publisher = "Lippincott Williams & Wilkins",
number = "9",

}

Chronic aldosterone administration causes Nox2-mediated increases in reactive oxygen species production and endothelial dysfunction in the cerebral circulation. / Chrissobolis, Sophcoles; Drummond, Grant R; Faraci, Frank M; Sobey, Christopher G.

In: Journal of Hypertension, Vol. 32, No. 9, 2014, p. 1815 - 1821.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Chronic aldosterone administration causes Nox2-mediated increases in reactive oxygen species production and endothelial dysfunction in the cerebral circulation

AU - Chrissobolis, Sophcoles

AU - Drummond, Grant R

AU - Faraci, Frank M

AU - Sobey, Christopher G

PY - 2014

Y1 - 2014

N2 - OBJECTIVES: An elevated plasma aldosterone level is an independent cardiovascular risk factor. Although excess aldosterone promotes cardiovascular disease, no studies have examined the effect of increased plasma aldosterone on the cerebral circulation. A major source of vascular reactive oxygen species (ROS) during cardiovascular disease is the NADPH oxidases. Because Nox2-containing NADPH oxidase (Nox2 oxidase) is highly expressed in the cerebral endothelium, we postulated that it might contribute to ROS generation and vascular dysfunction in response to aldosterone. Here, we examined the effect of aldosterone and Nox2 oxidase on ROS production and endothelial dysfunction in the cerebral circulation, and whether the effects of aldosterone are exacerbated in aged mice. METHODS AND RESULTS: In adult (average age approximately 24-25 weeks) wild-type and Nox2-deficient (Nox2) mice, neither vehicle nor aldosterone (0.28 mg/kg per day for 14 days) affected blood pressure (measured using tail-cuff). By contrast, aldosterone treatment reduced dilation of the basilar artery (measured using myography) to the endothelium-dependent agonist acetylcholine in wild-type mice (P <0.05), but had no such effect in Nox2 mice (P > 0.05). Aldosterone increased basal and phorbol dibutyrate-stimulated superoxide production (measured using L-012-enhanced chemiluminesence) in cerebral arteries from wild-type but not from Nox2 mice. In aged wild-type mice (average age approximately 70 weeks), aldosterone treatment increased blood pressure, but had a similar effect on cerebral artery superoxide levels as in adult wild-type mice. CONCLUSION: These data indicate that Nox2 oxidase mediates aldosterone-induced increases in ROS production and endothelial dysfunction in cerebral arteries from adult mice independently of blood pressure changes. Aldosterone-induced hypertension is augmented during aging.

AB - OBJECTIVES: An elevated plasma aldosterone level is an independent cardiovascular risk factor. Although excess aldosterone promotes cardiovascular disease, no studies have examined the effect of increased plasma aldosterone on the cerebral circulation. A major source of vascular reactive oxygen species (ROS) during cardiovascular disease is the NADPH oxidases. Because Nox2-containing NADPH oxidase (Nox2 oxidase) is highly expressed in the cerebral endothelium, we postulated that it might contribute to ROS generation and vascular dysfunction in response to aldosterone. Here, we examined the effect of aldosterone and Nox2 oxidase on ROS production and endothelial dysfunction in the cerebral circulation, and whether the effects of aldosterone are exacerbated in aged mice. METHODS AND RESULTS: In adult (average age approximately 24-25 weeks) wild-type and Nox2-deficient (Nox2) mice, neither vehicle nor aldosterone (0.28 mg/kg per day for 14 days) affected blood pressure (measured using tail-cuff). By contrast, aldosterone treatment reduced dilation of the basilar artery (measured using myography) to the endothelium-dependent agonist acetylcholine in wild-type mice (P <0.05), but had no such effect in Nox2 mice (P > 0.05). Aldosterone increased basal and phorbol dibutyrate-stimulated superoxide production (measured using L-012-enhanced chemiluminesence) in cerebral arteries from wild-type but not from Nox2 mice. In aged wild-type mice (average age approximately 70 weeks), aldosterone treatment increased blood pressure, but had a similar effect on cerebral artery superoxide levels as in adult wild-type mice. CONCLUSION: These data indicate that Nox2 oxidase mediates aldosterone-induced increases in ROS production and endothelial dysfunction in cerebral arteries from adult mice independently of blood pressure changes. Aldosterone-induced hypertension is augmented during aging.

UR - http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4151299/pdf/nihms619856.pdf

U2 - 10.1097/HJH.0000000000000259

DO - 10.1097/HJH.0000000000000259

M3 - Article

VL - 32

SP - 1815

EP - 1821

JO - Journal of Hypertension

JF - Journal of Hypertension

SN - 0263-6352

IS - 9

ER -