2016
DOI: 10.1161/atvbaha.116.307518
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Vascular Actions of Angiotensin 1–7 in the Human Microcirculation

Abstract: Objective This study examined vascular actions of angiotensin 1–7 (ANG 1–7) in human atrial and adipose arterioles. Approach and Results The endothelial-derived hyperpolarizing factor of flow mediated dilation (FMD) switches from anti-proliferative nitric oxide (NO) to pro-atherosclerotic hydrogen peroxide (H2O2) in arterioles from humans with coronary artery disease (CAD). Given the known vasoprotective properties of ANG 1–7, we tested the hypothesis that overnight ANG 1–7 treatment restores the NO-componen… Show more

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Cited by 55 publications
(51 citation statements)
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References 60 publications
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“…These findings suggest that loss of TERT may be a key component of the pathophysiology of cardiovascular diseases affected by overabundance of microvascular ROS, which may precipitate proinflammatory changes, or impaired overall dilator capacity, which may lead to downstream ischemia. The data presented in this report are consistent with our earlier findings using short-term pharmacological TERT inhibition (2,9) and extend these initial observations to chronic and in vivo effects of TERT in a genetic model. Moreover, the observation that deletion of TERC does not contribute the microvascular phenotypes identified in early generations underlines the physiological relevance of TERT itself as an independent regulator of ROS generation and FMD.…”
Section: Discussionsupporting
confidence: 91%
See 1 more Smart Citation
“…These findings suggest that loss of TERT may be a key component of the pathophysiology of cardiovascular diseases affected by overabundance of microvascular ROS, which may precipitate proinflammatory changes, or impaired overall dilator capacity, which may lead to downstream ischemia. The data presented in this report are consistent with our earlier findings using short-term pharmacological TERT inhibition (2,9) and extend these initial observations to chronic and in vivo effects of TERT in a genetic model. Moreover, the observation that deletion of TERC does not contribute the microvascular phenotypes identified in early generations underlines the physiological relevance of TERT itself as an independent regulator of ROS generation and FMD.…”
Section: Discussionsupporting
confidence: 91%
“…Western blot analysis. Protein expression was analyzed as previously described (9). Briefly, total protein (30 g) from MA (6 -8 pooled arteries/mouse) lysates was loaded and separated using SDS-PAGE and then transferred into a polyvinylidene difluoride membrane.…”
Section: Methodsmentioning
confidence: 99%
“…21 Mechanistically, ceramide-induced reduction in telomerase activity in mitochondria has been shown to cause this switch. 22,23 Although the sources and regulatory mechanisms of physiological ROS are inconclusive, local subcellular concentrations at microdomains rather than net intracellular concentrations may be critical to determine whether the effects of ROS can be gainful or harmful to cellular processes, and colocalization of the source and target of ROS may help prevent nonspecific injurious oxidations. 24 Among redox regulating proteins, endothelial thioredoxin reductase 2 has been shown to play a key role in the maintenance of healthy endothelial functions, 25 and peroxisome proliferator receptor-γ coactivator 1α has emerged as a master regulator of endothelial functions, including protection against oxidative stress, inflammation, and atherosclerosis.…”
Section: Reactive Oxygen Speciesmentioning
confidence: 99%
“…In cultured endothelial cells, stimulation of PPARγ with pioglitazone (TZD) improve endothelial stress resistance and reduces susceptibility to senescence stimuli by activating telomerase and reducing senescence marker expression (Table 2) (89). Recent data by Durand et al (90) (supplemental material) further support this notion, as Rosiglitazone restored normal NO mediated, endothelium-dependent dilation in vessels from subjects with CAD (normally mediated by H 2 O 2 ) in a telomerase-dependent manner. The underlying mechanisms determining how PPARγ differentially regulates TERT, dependent on cell type, has yet to be determined.…”
Section: Role Of Telomerase In Of Cardiovascular Diseasementioning
confidence: 81%