scholarly journals Hydrogen peroxide and nitric oxide induce anticontractile effect of perivascular adipose tissue via renin angiotensin system activation

Nitric Oxide ◽  
2019 ◽  
Vol 84 ◽  
pp. 50-59 ◽  
Author(s):  
Natália Nóbrega ◽  
Natália Ferreira Araújo ◽  
Daniela Reis ◽  
Larissa Moreira Facine ◽  
Claudiane Aparecida S. Miranda ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Hydrogen Peroxide ◽  
Adipose Tissue ◽  
Renin Angiotensin System ◽  
Perivascular Adipose Tissue ◽  
Angiotensin System ◽  
Renin Angiotensin ◽  
System Activation

scholarly journals High-Carbohydrate Diet Enhanced the Anticontractile Effect of Perivascular Adipose Tissue Through Activation of Renin-Angiotensin System

2021 ◽  
Vol 11 ◽  
Author(s):  
Daniela Esteves Ferreira dos Reis Costa ◽  
Ana Letícia Malheiros Silveira ◽  
Gianne Paul Campos ◽  
Natália Ribeiro Cabacinha Nóbrega ◽  
Natália Ferreira de Araújo ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Hydrogen Peroxide ◽  
Vascular Tone ◽  
Renin Angiotensin System ◽  
High Carbohydrate Diet ◽  
Carbohydrate Diet ◽  
Perivascular Adipose Tissue ◽  
Angiotensin System ◽  
Renin Angiotensin ◽  
High Carbohydrate

The perivascular adipose tissue (PVAT) is an active endocrine organ responsible for release several substances that influence on vascular tone. Increasing evidence suggest that hyperactivation of the local renin-angiotensin system (RAS) in the PVAT plays a pivotal role in the pathogenesis of cardiometabolic diseases. However, the local RAS contribution to the PVAT control of vascular tone during obesity is still not clear. Since the consumption of a high-carbohydrate diet (HC diet) contributes to obesity inducing a rapid and sustained increase in adiposity, so that the functional activity of PVAT could be modulated, we aimed to evaluate the effect of HC diet on the PVAT control of vascular tone and verify the involvement of RAS in this effect. For that, male Balb/c mice were fed standard or HC diet for 4 weeks. Vascular reactivity, histology, fluorescence, and immunofluorescence analysis were performed in intact thoracic aorta in the presence or absence of PVAT. The results showed that HC diet caused an increase in visceral adiposity and also in the PVAT area. Phenylephrine-induced vasoconstriction was significantly reduced in the HC group only in the presence of PVAT. The anticontractile effect of PVAT induced by HC diet was lost when aortic rings were previously incubated with angiotensin-converting enzyme inhibitor, Mas, and AT2 receptors antagonists, PI3K, nNOS, and iNOS inhibitors, hydrogen peroxide (H2O2) decomposing enzyme or non-selective potassium channels blocker. Immunofluorescence assays showed that both Mas and AT2 receptors as well as nNOS and iNOS isoforms were markedly expressed in the PVAT of the HC group. Furthermore, the PVAT from HC group also exhibited higher nitric oxide (NO) and hydrogen peroxide bioavailability. Taken together, these findings suggest that the anticontractile effect of PVAT induced by HC diet involves the signaling cascade triggered by the renin-angiotensin system through the activation of Mas and AT2 receptors, PI3K, nNOS, and iNOS, leading to increased production of nitric oxide and hydrogen peroxide, and subsequently opening of potassium channels. The contribution of PVAT during HC diet-induced obesity could be a compensatory adaptive characteristic in order to preserve the vascular function.

scholarly journals Comparative expression analysis of the renin–angiotensin system components between white and brown perivascular adipose tissue

2008 ◽  
Vol 197 (1) ◽  
pp. 55-64 ◽  
Author(s):  
B Gálvez-Prieto ◽  
J Bolbrinker ◽  
P Stucchi ◽  
A I de las Heras ◽  
B Merino ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Renin Angiotensin System ◽  
Receptor Expression ◽  
Mrna Levels ◽  
Ang Ii ◽  
Perivascular Adipose Tissue ◽  
Angiotensin System ◽  
Renin Angiotensin ◽  
Vascular Bed ◽  
Brown Adipose

Recent studies have demonstrated that the rat adipose tissue expresses some of the components necessary for the production of angiotensin II (Ang II) and the receptors mediating its actions. The aim of this work is to characterize the expression of the renin–angiotensin system (RAS) components in perivascular adipose tissue and to assess differences in the expression pattern depending on the vascular bed and type of adipose tissue. We analyzed Ang I and Ang II levels as well as mRNA levels of RAS components by a quantitative RT-PCR method in periaortic (PAT) and mesenteric adipose tissue (MAT) of 3-month-old male Wistar–Kyoto rats. PAT was identified as brown adipose tissue expressing uncoupling protein-1 (UCP-1). It had smaller adipocytes than those from MAT, which was identified as white adipose tissue. All RAS components, except renin, were detected in both PAT and MAT. Levels of expression of angiotensinogen, Ang-converting enzyme (ACE), and ACE2 were similar between PAT and MAT. Renin receptor expression was five times higher, whereas expression of chymase, AT1a, and AT2 receptors were significantly lower in PAT compared with MAT respectively. In addition, three isoforms of the AT1a receptor were found in perivascular adipose tissue. The AT1b receptor was found at very a low expression level. Ang II levels were higher in MAT with no differences between tissues in Ang I. The results show that the RAS is differentially expressed in white and brown perivascular adipose tissues implicating a different role for the system depending on the vascular bed and the type of adipose tissue.

Periaortic adipose tissue-specific activation of the renin-angiotensin system contributes to atherosclerosis development in uninephrectomized apoE−/− mice

2013 ◽  
Vol 305 (5) ◽  
pp. H667-H675 ◽  
Author(s):  
Hiroyuki Kawahito ◽  
Hiroyuki Yamada ◽  
Daisuke Irie ◽  
Taku Kato ◽  
Yoshiki Akakabe ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Mrna Expression ◽  
Atherosclerotic Lesion ◽  
Renin Angiotensin System ◽  
Model Assessment ◽  
Ang Ii ◽  
Lesion Area ◽  
Perivascular Adipose Tissue ◽  
Angiotensin System ◽  
Renin Angiotensin

Chronic kidney disease (CKD) is an independent risk factor for the development of cardiovascular disease. The perivascular adipose tissue is closely implicated in the development of atherosclerosis; however, the contribution to CKD-associated atherogenesis remains undefined. Eight-week-old apoE-deficient mice were uninephrectomized and fed a high-cholesterol diet starting at 12 wk of age. The atherosclerotic lesion area in the thoracic aorta was comparable in 16-wk-old uninephrectomized (UNX) mice and sham control mice; however, the lesion area was markedly exaggerated in 20-wk-old UNX mice compared with the control (54%, P < 0.05). While the accumulation of monocytes/macrophages and the mRNA expression levels of inflammatory cytokines/chemokines in the thoracic periaortic adipose tissue (PAT) did not differ between the two groups, angiotensinogen (AGT) mRNA expression and the angiotensin II (ANG II) concentration in the PAT were significantly higher in 16-wk-old UNX mice than in the control (1.9- and 1.5-fold increases vs. control, respectively; P < 0.05). ANG II concentrations in both the plasma and epididymal white adipose tissue (WAT) were comparable between the two groups, suggesting that PAT-specific activation of the renin-angiotensin system (RAS) is primarily involved in CKD-associated atherogenesis. The homeostasis model assessment-insulin resistance (HOMA-IR) index and plasma insulin level after glucose loading were significantly elevated in 16-wk-old UNX mice. In vitro stimulation of preadipocytes with insulin exaggerated the AGT mRNA expression along with increased mRNA expression of PPARγ. These findings suggest that PAT-specific RAS activation probably primarily contributes in accelerating atherosclerotic development in UNX mice and could thus represent a therapeutic target for preventing CKD-associated atherogenesis.

scholarly journals Açaí seed extract prevents the renin-angiotensin system activation, oxidative stress and inflammation in white adipose tissue of high-fat diet–fed mice

2020 ◽  
Vol 79 ◽  
pp. 35-49 ◽  
Author(s):  
Izabelle Barcellos Santos ◽  
Graziele Freitas de Bem ◽  
Cristiane Aguiar da Costa ◽  
Lenize Costa Reis Marins de Carvalho ◽  
Amanda Faria de Medeiros ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Adipose Tissue ◽  
White Adipose Tissue ◽  
High Fat Diet ◽  
Renin Angiotensin System ◽  
Seed Extract ◽  
High Fat ◽  
Angiotensin System ◽  
Renin Angiotensin ◽  
System Activation

Blockade of the renin–angiotensin system in small arteries and anticontractile function of perivascular adipose tissue

2015 ◽  
Vol 33 (5) ◽  
pp. 1039-1045 ◽  
Author(s):  
Claudia Agabiti Rosei ◽  
Sarah B. Withers ◽  
Laila Belcaid ◽  
Carolina De Ciuceis ◽  
Damiano Rizzoni ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Renin Angiotensin System ◽  
Perivascular Adipose Tissue ◽  
Angiotensin System ◽  
Small Arteries ◽  
Renin Angiotensin

The physiologic and physiopathologic roles of perivascular adipose tissue and its interactions with blood vessels and the renin-angiotensin system

2021 ◽  
Vol 173 ◽  
pp. 105890
Author(s):  
Pitchai Balakumar ◽  
Ali Alqahtani ◽  
Noohu Abdulla Khan ◽  
Taha Alqahtani ◽  
Thangathirupathi A ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Blood Vessels ◽  
Renin Angiotensin System ◽  
Perivascular Adipose Tissue ◽  
Angiotensin System ◽  
Renin Angiotensin

scholarly journals Renin–angiotensin system overactivation in perivascular adipose tissue contributes to vascular dysfunction in heart failure

2020 ◽  
Vol 134 (23) ◽  
pp. 3195-3211
Author(s):  
Milene Tavares Fontes ◽  
Suliana Mesquita Paula ◽  
Caroline Antunes Lino ◽  
Nathalia Senger ◽  
Gisele Kruger Couto ◽  
...  
Keyword(s):  
Heart Failure ◽  
Adipose Tissue ◽  
Angiotensin Ii ◽  
Thoracic Aorta ◽  
Vascular Dysfunction ◽  
Renin Angiotensin System ◽  
Angiotensin Ii Receptor ◽  
Perivascular Adipose Tissue ◽  
Angiotensin System ◽  
Renin Angiotensin

Abstract Perivascular adipose tissue (PVAT) dysfunction is associated with vascular damage in cardiometabolic diseases. Although heart failure (HF)-induced endothelial dysfunction is associated with renin–angiotensin system (RAS) activation, no data have correlated this syndrome with PVAT dysfunction. Thus, the aim of the present study was to investigate whether the hyperactivation of the RAS in PVAT participates in the vascular dysfunction observed in rats with HF after myocardial infarction surgery. Wire myograph studies were carried out in thoracic aorta rings in the presence and absence of PVAT. An anticontractile effect of PVAT was observed in the rings of the control rats in the presence (33%) or absence (11%) of endothelium. Moreover, this response was substantially reduced in animals with HF (5%), and acute type 1 angiotensin II receptor (AT1R) and type 2 angiotensin II receptor (AT2R) blockade restored the anticontractile effect of PVAT. In addition, the angiotensin-converting enzyme 1 (ACE1) activity (26%) and angiotensin II levels (51%), as well as the AT1R and AT2R gene expression, were enhanced in the PVAT of rats with HF. Associated with these alterations, HF-induced lower nitric oxide bioavailability, oxidative stress and whitening of the PVAT, which suggests changes in the secretory function of this tissue. The ACE1/angiotensin II/AT1R and AT2R axes are involved in thoracic aorta PVAT dysfunction in rats with HF. These results suggest PVAT as a target in the pathophysiology of vascular dysfunction in HF and provide new perspectives for the treatment of this syndrome.

Commentary on: Renin–angiotensin system overactivation in perivascular adipose tissue contributes to vascular dysfunction in heart failure

2021 ◽  
Vol 135 (5) ◽  
pp. 683-686
Author(s):  
Carlos M. Ferrario
Keyword(s):  
Heart Failure ◽  
Adipose Tissue ◽  
Coronary Artery ◽  
Vascular Dysfunction ◽  
Renin Angiotensin System ◽  
Perivascular Adipose Tissue ◽  
Angiotensin System ◽  
Renin Angiotensin ◽  
Experimental Heart Failure

Abstract We comment on the publication of a paper in which Brazilian investigators evaluate the anticontractile response of perivascular adipose tissue (PVAT) in experimental heart failure (HF) induced in rats by occlusion of a coronary artery.

In vivo inhibition of nitric oxide synthesis does not depend on renin-angiotensin system activation

1996 ◽  
Vol 317 (2-3) ◽  
pp. 285-291 ◽  
Author(s):  
Aldete Zappellini ◽  
Simone A. Teixeira ◽  
Marcelo N Muscará ◽  
Roberto Zatz ◽  
Edson Antunes ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Renin Angiotensin System ◽  
Nitric Oxide Synthesis ◽  
Angiotensin System ◽  
Renin Angiotensin ◽  
System Activation
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