Mineralocorticoid receptor blockade attenuates chronic overexpression of the renin-angiotensin-aldosterone system stimulation of reduced nicotinamide adenine dinucleotide phosphate oxidase and cardiac remodeling

Sameer Stas, Adam Whaley-Connell, Javad Habibi, Lama Appesh, Melvin R. Hayden, Poorna R. Karuparthi, Mahnaz Qazi, E. Matthew Morris, Shawna A. Cooper, C. Daniel Link, Craig S Stump, Meredith Hay, Carlos Ferrario, James R. Sowers

Research output: Contribution to journalArticle

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Abstract

The renin-angiotensin-aldosterone system contributes to cardiac remodeling, hypertrophy, and left ventricular dysfunction. Angiotensin II and aldosterone (corticosterone in rodents) together generate reactive oxygen species (ROS) via reduced nicotinamide adenine dinucleotide phosphate (NADPH) oxidase, which likely facilitate this hypertrophy and remodeling. This investigation sought to determine whether cardiac oxidative stress and cellular remodeling could be attenuated by in vivo mineralocorticoid receptor (MR) blockade in a rodent model of the chronically elevated tissue renin-angiotensin-aldosterone system, the transgenic TG (mRen2) 27 rat (Ren2). The Ren2 overexpresses the mouse renin transgene with resultant hypertension, insulin resistance, proteinuria, and cardiovascular damage. Young (6- to 7-wk-old) male Ren2 and age-matched Sprague-Dawley rats were treated with spironolactone or placebo for 3 wk. Heart tissue ROS, immunohistochemical analysis of 3-nitrotyrosine, and NADPH oxidase (NOX) subunits (gp91phox recently renamed NOX2, p22phox, Rac1, NOX1, and NOX4) were measured. Structural changes were assessed with cine-magnetic resonance imaging, transmission electron microscopy, and light microscopy. Significant increases in Ren2 septal wall thickness (cine-magnetic resonance imaging) were accompanied by perivascular fibrosis, increased mitochondria, and other ultrastructural changes visible by light microscopy and transmission electron microscopy. Although there was no significant reduction in systolic blood pressure, significant improvements were seen with MR blockade on ROS formation and NOX subunits (each P < 0.05). Collectively, these data suggest that MR blockade, independent of systolic blood pressure reduction, improves cardiac oxidative stress-induced structural and functional changes, which are driven, in part, by angiotensin type 1 receptor-mediated increases in NOX.

Original languageEnglish (US)
Pages (from-to)3773-3780
Number of pages8
JournalEndocrinology
Volume148
Issue number8
DOIs
StatePublished - Aug 2007

Fingerprint

Mineralocorticoid Receptors
Renin-Angiotensin System
NADP
Oxidoreductases
Cine Magnetic Resonance Imaging
Blood Pressure
Reactive Oxygen Species
NADPH Oxidase
Transmission Electron Microscopy
Microscopy
Rodentia
Oxidative Stress
Light
Angiotensin Type 1 Receptor
Spironolactone
Cardiomegaly
Left Ventricular Dysfunction
Corticosterone
Aldosterone
Transgenes

ASJC Scopus subject areas

  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

Cite this

Mineralocorticoid receptor blockade attenuates chronic overexpression of the renin-angiotensin-aldosterone system stimulation of reduced nicotinamide adenine dinucleotide phosphate oxidase and cardiac remodeling. / Stas, Sameer; Whaley-Connell, Adam; Habibi, Javad; Appesh, Lama; Hayden, Melvin R.; Karuparthi, Poorna R.; Qazi, Mahnaz; Morris, E. Matthew; Cooper, Shawna A.; Link, C. Daniel; Stump, Craig S; Hay, Meredith; Ferrario, Carlos; Sowers, James R.

In: Endocrinology, Vol. 148, No. 8, 08.2007, p. 3773-3780.

Research output: Contribution to journalArticle

Stas, S, Whaley-Connell, A, Habibi, J, Appesh, L, Hayden, MR, Karuparthi, PR, Qazi, M, Morris, EM, Cooper, SA, Link, CD, Stump, CS, Hay, M, Ferrario, C & Sowers, JR 2007, 'Mineralocorticoid receptor blockade attenuates chronic overexpression of the renin-angiotensin-aldosterone system stimulation of reduced nicotinamide adenine dinucleotide phosphate oxidase and cardiac remodeling', Endocrinology, vol. 148, no. 8, pp. 3773-3780. https://doi.org/10.1210/en.2006-1691
Stas, Sameer ; Whaley-Connell, Adam ; Habibi, Javad ; Appesh, Lama ; Hayden, Melvin R. ; Karuparthi, Poorna R. ; Qazi, Mahnaz ; Morris, E. Matthew ; Cooper, Shawna A. ; Link, C. Daniel ; Stump, Craig S ; Hay, Meredith ; Ferrario, Carlos ; Sowers, James R. / Mineralocorticoid receptor blockade attenuates chronic overexpression of the renin-angiotensin-aldosterone system stimulation of reduced nicotinamide adenine dinucleotide phosphate oxidase and cardiac remodeling. In: Endocrinology. 2007 ; Vol. 148, No. 8. pp. 3773-3780.
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abstract = "The renin-angiotensin-aldosterone system contributes to cardiac remodeling, hypertrophy, and left ventricular dysfunction. Angiotensin II and aldosterone (corticosterone in rodents) together generate reactive oxygen species (ROS) via reduced nicotinamide adenine dinucleotide phosphate (NADPH) oxidase, which likely facilitate this hypertrophy and remodeling. This investigation sought to determine whether cardiac oxidative stress and cellular remodeling could be attenuated by in vivo mineralocorticoid receptor (MR) blockade in a rodent model of the chronically elevated tissue renin-angiotensin-aldosterone system, the transgenic TG (mRen2) 27 rat (Ren2). The Ren2 overexpresses the mouse renin transgene with resultant hypertension, insulin resistance, proteinuria, and cardiovascular damage. Young (6- to 7-wk-old) male Ren2 and age-matched Sprague-Dawley rats were treated with spironolactone or placebo for 3 wk. Heart tissue ROS, immunohistochemical analysis of 3-nitrotyrosine, and NADPH oxidase (NOX) subunits (gp91phox recently renamed NOX2, p22phox, Rac1, NOX1, and NOX4) were measured. Structural changes were assessed with cine-magnetic resonance imaging, transmission electron microscopy, and light microscopy. Significant increases in Ren2 septal wall thickness (cine-magnetic resonance imaging) were accompanied by perivascular fibrosis, increased mitochondria, and other ultrastructural changes visible by light microscopy and transmission electron microscopy. Although there was no significant reduction in systolic blood pressure, significant improvements were seen with MR blockade on ROS formation and NOX subunits (each P < 0.05). Collectively, these data suggest that MR blockade, independent of systolic blood pressure reduction, improves cardiac oxidative stress-induced structural and functional changes, which are driven, in part, by angiotensin type 1 receptor-mediated increases in NOX.",
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AU - Appesh, Lama

AU - Hayden, Melvin R.

AU - Karuparthi, Poorna R.

AU - Qazi, Mahnaz

AU - Morris, E. Matthew

AU - Cooper, Shawna A.

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AU - Stump, Craig S

AU - Hay, Meredith

AU - Ferrario, Carlos

AU - Sowers, James R.

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