Aortic remodeling after transverse aortic constriction in mice is attenuated with AT1 receptor blockade

Shao Qing Kuang, Liang Geng, Siddharth K. Prakash, Jiu Mei Cao, Steven Guo, Carlos Villamizar, Callie S. Kwartler, Andrew M. Peters, Allan R. Brasier, Dianna M. Milewicz

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Objective-Although hypertension is the most common risk factor for thoracic aortic diseases, it is not understood how increased pressures on the ascending aorta lead to aortic aneurysms. We investigated the role of angiotensin II type 1 receptor activation in ascending aortic remodeling in response to increased biomechanical forces using a transverse aortic constriction (TAC) mouse model. Approach and Results-Two weeks after TAC, the increased biomechanical pressures led to ascending aortic dilatation and thickening of the medial and adventitial layers of the aorta. There was significant adventitial hyperplasia and inflammatory responses in TAC ascending aortas were accompanied by increased adventitial collagen, elevated inflammatory and proliferative markers, and increased cell density attributable to accumulation of myofibroblasts and macrophages. Treatment with losartan significantly blocked TAC-induced vascular inflammation and macrophage accumulation. However, losartan only partially prevented TAC-induced adventitial hyperplasia, collagen accumulation, and ascending aortic dilatation. Increased Tgfb2 expression and phosphorylated-Smad2 staining in the medial layer of TAC ascending aortas were effectively blocked with losartan. In contrast, the increased Tgfb1 expression and adventitial phospho-Smad2 staining were only partially attenuated by losartan. In addition, losartan significantly blocked extracellular signal-regulated kinase activation and reactive oxygen species production in the TAC ascending aorta. Conclusions-Inhibition of the angiotensin II type 1 receptor using losartan significantly attenuated the vascular remodeling associated with TAC but did not completely block the increased transforming growth factor-β1 expression, adventitial Smad2 signaling, and collagen accumulation. These results help to delineate the aortic transforming growth factor-β signaling that is dependent and independent of the angiotensin II type 1 receptor after TAC.

Original languageEnglish (US)
Pages (from-to)2172-2179
Number of pages8
JournalArteriosclerosis, Thrombosis, and Vascular Biology
Volume33
Issue number9
DOIs
StatePublished - Sep 2013

Fingerprint

Constriction
Adventitia
Losartan
Aorta
Angiotensin Type 1 Receptor
Collagen
Transforming Growth Factors
Hyperplasia
Dilatation
Macrophages
Thoracic Diseases
Staining and Labeling
Pressure
Aortic Diseases
Myofibroblasts
Aortic Aneurysm
Extracellular Signal-Regulated MAP Kinases
Blood Vessels
Reactive Oxygen Species
Cell Count

Keywords

  • aortic aneurysm, thoracic
  • receptor, angiotensin, type 1
  • transforming growth factors

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Cite this

Aortic remodeling after transverse aortic constriction in mice is attenuated with AT1 receptor blockade. / Kuang, Shao Qing; Geng, Liang; Prakash, Siddharth K.; Cao, Jiu Mei; Guo, Steven; Villamizar, Carlos; Kwartler, Callie S.; Peters, Andrew M.; Brasier, Allan R.; Milewicz, Dianna M.

In: Arteriosclerosis, Thrombosis, and Vascular Biology, Vol. 33, No. 9, 09.2013, p. 2172-2179.

Research output: Contribution to journalArticle

Kuang, SQ, Geng, L, Prakash, SK, Cao, JM, Guo, S, Villamizar, C, Kwartler, CS, Peters, AM, Brasier, AR & Milewicz, DM 2013, 'Aortic remodeling after transverse aortic constriction in mice is attenuated with AT1 receptor blockade', Arteriosclerosis, Thrombosis, and Vascular Biology, vol. 33, no. 9, pp. 2172-2179. https://doi.org/10.1161/ATVBAHA.113.301624
Kuang, Shao Qing ; Geng, Liang ; Prakash, Siddharth K. ; Cao, Jiu Mei ; Guo, Steven ; Villamizar, Carlos ; Kwartler, Callie S. ; Peters, Andrew M. ; Brasier, Allan R. ; Milewicz, Dianna M. / Aortic remodeling after transverse aortic constriction in mice is attenuated with AT1 receptor blockade. In: Arteriosclerosis, Thrombosis, and Vascular Biology. 2013 ; Vol. 33, No. 9. pp. 2172-2179.
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abstract = "Objective-Although hypertension is the most common risk factor for thoracic aortic diseases, it is not understood how increased pressures on the ascending aorta lead to aortic aneurysms. We investigated the role of angiotensin II type 1 receptor activation in ascending aortic remodeling in response to increased biomechanical forces using a transverse aortic constriction (TAC) mouse model. Approach and Results-Two weeks after TAC, the increased biomechanical pressures led to ascending aortic dilatation and thickening of the medial and adventitial layers of the aorta. There was significant adventitial hyperplasia and inflammatory responses in TAC ascending aortas were accompanied by increased adventitial collagen, elevated inflammatory and proliferative markers, and increased cell density attributable to accumulation of myofibroblasts and macrophages. Treatment with losartan significantly blocked TAC-induced vascular inflammation and macrophage accumulation. However, losartan only partially prevented TAC-induced adventitial hyperplasia, collagen accumulation, and ascending aortic dilatation. Increased Tgfb2 expression and phosphorylated-Smad2 staining in the medial layer of TAC ascending aortas were effectively blocked with losartan. In contrast, the increased Tgfb1 expression and adventitial phospho-Smad2 staining were only partially attenuated by losartan. In addition, losartan significantly blocked extracellular signal-regulated kinase activation and reactive oxygen species production in the TAC ascending aorta. Conclusions-Inhibition of the angiotensin II type 1 receptor using losartan significantly attenuated the vascular remodeling associated with TAC but did not completely block the increased transforming growth factor-β1 expression, adventitial Smad2 signaling, and collagen accumulation. These results help to delineate the aortic transforming growth factor-β signaling that is dependent and independent of the angiotensin II type 1 receptor after TAC.",
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AU - Kuang, Shao Qing

AU - Geng, Liang

AU - Prakash, Siddharth K.

AU - Cao, Jiu Mei

AU - Guo, Steven

AU - Villamizar, Carlos

AU - Kwartler, Callie S.

AU - Peters, Andrew M.

AU - Brasier, Allan R.

AU - Milewicz, Dianna M.

PY - 2013/9

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N2 - Objective-Although hypertension is the most common risk factor for thoracic aortic diseases, it is not understood how increased pressures on the ascending aorta lead to aortic aneurysms. We investigated the role of angiotensin II type 1 receptor activation in ascending aortic remodeling in response to increased biomechanical forces using a transverse aortic constriction (TAC) mouse model. Approach and Results-Two weeks after TAC, the increased biomechanical pressures led to ascending aortic dilatation and thickening of the medial and adventitial layers of the aorta. There was significant adventitial hyperplasia and inflammatory responses in TAC ascending aortas were accompanied by increased adventitial collagen, elevated inflammatory and proliferative markers, and increased cell density attributable to accumulation of myofibroblasts and macrophages. Treatment with losartan significantly blocked TAC-induced vascular inflammation and macrophage accumulation. However, losartan only partially prevented TAC-induced adventitial hyperplasia, collagen accumulation, and ascending aortic dilatation. Increased Tgfb2 expression and phosphorylated-Smad2 staining in the medial layer of TAC ascending aortas were effectively blocked with losartan. In contrast, the increased Tgfb1 expression and adventitial phospho-Smad2 staining were only partially attenuated by losartan. In addition, losartan significantly blocked extracellular signal-regulated kinase activation and reactive oxygen species production in the TAC ascending aorta. Conclusions-Inhibition of the angiotensin II type 1 receptor using losartan significantly attenuated the vascular remodeling associated with TAC but did not completely block the increased transforming growth factor-β1 expression, adventitial Smad2 signaling, and collagen accumulation. These results help to delineate the aortic transforming growth factor-β signaling that is dependent and independent of the angiotensin II type 1 receptor after TAC.

AB - Objective-Although hypertension is the most common risk factor for thoracic aortic diseases, it is not understood how increased pressures on the ascending aorta lead to aortic aneurysms. We investigated the role of angiotensin II type 1 receptor activation in ascending aortic remodeling in response to increased biomechanical forces using a transverse aortic constriction (TAC) mouse model. Approach and Results-Two weeks after TAC, the increased biomechanical pressures led to ascending aortic dilatation and thickening of the medial and adventitial layers of the aorta. There was significant adventitial hyperplasia and inflammatory responses in TAC ascending aortas were accompanied by increased adventitial collagen, elevated inflammatory and proliferative markers, and increased cell density attributable to accumulation of myofibroblasts and macrophages. Treatment with losartan significantly blocked TAC-induced vascular inflammation and macrophage accumulation. However, losartan only partially prevented TAC-induced adventitial hyperplasia, collagen accumulation, and ascending aortic dilatation. Increased Tgfb2 expression and phosphorylated-Smad2 staining in the medial layer of TAC ascending aortas were effectively blocked with losartan. In contrast, the increased Tgfb1 expression and adventitial phospho-Smad2 staining were only partially attenuated by losartan. In addition, losartan significantly blocked extracellular signal-regulated kinase activation and reactive oxygen species production in the TAC ascending aorta. Conclusions-Inhibition of the angiotensin II type 1 receptor using losartan significantly attenuated the vascular remodeling associated with TAC but did not completely block the increased transforming growth factor-β1 expression, adventitial Smad2 signaling, and collagen accumulation. These results help to delineate the aortic transforming growth factor-β signaling that is dependent and independent of the angiotensin II type 1 receptor after TAC.

KW - aortic aneurysm, thoracic

KW - receptor, angiotensin, type 1

KW - transforming growth factors

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