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• Liu, J
• Wu, X
• Wang, X
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• Bu, P
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• Jiang, F
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• Wang, X
• Zhang, Y
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• Zhang, Q
• Jiang, F
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Int. J. Mol. Sci. 2013, 14(3), 5633-5649; doi:10.3390/ijms14035633

Article

Global Gene Expression Profiling Reveals Functional Importance of Sirt2 in Endothelial Cells under Oxidative Stress

Junni Liu ^1,2 , Xiao Wu ¹ , Xi Wang ^1,2 , Yun Zhang ¹ , Peili Bu ^2,* , Qunye Zhang ^1,*  and Fan Jiang ^1,*

¹ Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Public Health, Shandong University, Jinan 250012, Shandong, China ² Department of Cardiology, Qilu Hospital, Shandong University, Jinan 250012, Shandong, China

* Authors to whom correspondence should be addressed.

Received: 19 December 2012; in revised form: 22 February 2013 / Accepted: 28 February 2013 / Published: 11 March 2013

(This article belongs to the Special Issue Redox Signaling in Biology and Patho-Biology)

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Abstract: The NAD⁺-dependent deacetylases Sirt1 and Sirt2 mediate cellular stress responses and are highly expressed in vascular endothelial cells. In contrast to the well-documented protective actions of Sirt1, the role of endothelial Sirt2 remains unknown. Using cDNA microarray and PCR validation, we examined global gene expression changes in response to Sirt2 knock down in primary human umbilical vein endothelial cells under oxidative stress. We found that Sirt2 knock down changed expression of 340 genes, which are mainly involved in cellular processes including actin binding, cellular amino acid metabolic process, transmembrane receptor protein serine/threonine kinase signaling, ferrous iron transport, protein transport and localization, cell morphogenesis, and functions associated with endosome membrane and the trans-Golgi network. These genes and associated functions were largely non-overlapping with those altered by Sirt1 knock down. Moreover, we showed that pharmacological inhibition of Sirt2 attenuated oxidant-induced cell toxicity in endothelial cells. These suggest that Sirt2 is functionally important in endothelial cells under oxidative stress, and may have a primarily distinct role as compared to Sirt1. Our results may provide a basis for future studies aiming to dissect the specific signaling pathway(s) that mediates specific Sirt2 functions in endothelial cells.

Keywords: Sirt1; Sirt2; endothelial cell; oxidative stress; functional genomics; microarray

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