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Arginase iI promotes macrophage inflammatory responses through mitochondrial reactive oxygen species, contributing to insulin resistance and atherogenesis

Ming, Xiu‐Fen ; Rajapakse, Angana G. ; Yepuri, Gautham ; Xiong, Yuyan ; Carvas, João M. ; Ruffieux, Jean ; Scerri, Isabelle ; Wu, Zongsong ; Popp, Katja ; Li, Jianhui ; Sartori, Claudio ; Scherrer, Urs ; Kwak, Brenda R. ; Montani, Jean‐Pierre ; Yang, Zhihong

In: Journal of the American Heart Association, 2012, p. -

Background Macrophage‐mediated chronic inflammation is mechanistically linked to insulin resistance and atherosclerosis. Although arginase I is considered antiinflammatory, the role of arginase II (Arg‐II) in macrophage function remains elusive. This study characterizes the role of Arg‐II in macrophage inflammatory responses and its impact on obesity‐linked type II...

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Hyperactive S6K1 mediates oxidative stress and endothelial dysfunction in aging: inhibition by resveratrol

Rajapakse, Angana Gupta ; Yepuri, Gautham ; Carvas, João M. ; Stein, Sokrates ; Matter, Christian M. ; Scerri, Isabelle ; Ruffieux, Jean ; Montani, Jean-Pierre ; Ming, Xiu-Fen ; Yang, Zhihong

In: PLoS ONE, 2011, vol. 6, no. 4, p. e19237

Mammalian target of rapamycin (mTOR)/S6K1 signalling emerges as a critical regulator of aging. Yet, a role of mTOR/S6K1 in aging-associated vascular endothelial dysfunction remains unknown. In this study, we investigated the role of S6K1 in aging-associated endothelial dysfunction and effects of the polyphenol resveratrol on S6K1 in aging endothelial cells. We show here that senescent endothelial...

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