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      Role of Reactive Oxygen Species in the Progression of Type 2 Diabetes and Atherosclerosis

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          Abstract

          Type 2 diabetes is the most prevalent and serious metabolic disease all over the world, and its hallmarks are pancreatic β-cell dysfunction and insulin resistance. Under diabetic conditions, chronic hyperglycemia and subsequent augmentation of reactive oxygen species (ROS) deteriorate β-cell function and increase insulin resistance which leads to the aggravation of type 2 diabetes. In addition, chronic hyperglycemia and ROS are also involved in the development of atherosclerosis which is often observed under diabetic conditions. Taken together, it is likely that ROS play an important role in the development of type 2 diabetes and atherosclerosis.

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          Most cited references136

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          IKK-beta links inflammation to obesity-induced insulin resistance.

          Inflammation may underlie the metabolic disorders of insulin resistance and type 2 diabetes. IkappaB kinase beta (IKK-beta, encoded by Ikbkb) is a central coordinator of inflammatory responses through activation of NF-kappaB. To understand the role of IKK-beta in insulin resistance, we used mice lacking this enzyme in hepatocytes (Ikbkb(Deltahep)) or myeloid cells (Ikbkb(Deltamye)). Ikbkb(Deltahep) mice retain liver insulin responsiveness, but develop insulin resistance in muscle and fat in response to high fat diet, obesity or aging. In contrast, Ikbkb(Deltamye) mice retain global insulin sensitivity and are protected from insulin resistance. Thus, IKK-beta acts locally in liver and systemically in myeloid cells, where NF-kappaB activation induces inflammatory mediators that cause insulin resistance. These findings demonstrate the importance of liver cell IKK-beta in hepatic insulin resistance and the central role of myeloid cells in development of systemic insulin resistance. We suggest that inhibition of IKK-beta, especially in myeloid cells, may be used to treat insulin resistance.
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            In vivo protein transduction: delivery of a biologically active protein into the mouse.

            Delivery of therapeutic proteins into tissues and across the blood-brain barrier is severely limited by the size and biochemical properties of the proteins. Here it is shown that intraperitoneal injection of the 120-kilodalton beta-galactosidase protein, fused to the protein transduction domain from the human immunodeficiency virus TAT protein, results in delivery of the biologically active fusion protein to all tissues in mice, including the brain. These results open new possibilities for direct delivery of proteins into patients in the context of protein therapy, as well as for epigenetic experimentation with model organisms.
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              FoxOs at the crossroads of cellular metabolism, differentiation, and transformation.

              Forkhead transcription factors of the FoxO subfamily are emerging as a shared component among pathways regulating diverse cellular functions, such as differentiation, metabolism, proliferation, and survival. Their transcriptional output is controlled via a two-tiered mechanism of phosphorylation and acetylation. Modest alterations of this balance can result in profound effects. The gamut of phenotypes runs from protection against diabetes and predisposition to neoplasia, conferred by FoxO loss of function, to increased cellular survival and a marked catabolic response associated with gain of function.
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                Author and article information

                Journal
                Mediators Inflamm
                MI
                Mediators of Inflammation
                Hindawi Publishing Corporation
                0962-9351
                1466-1861
                2010
                16 February 2010
                : 2010
                : 453892
                Affiliations
                Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
                Author notes

                Academic Editor: Giamila Fantuzzi

                Article
                10.1155/2010/453892
                2825658
                20182627
                9a613062-10dc-4824-ac8a-079f1a582fe3
                Copyright © 2010 Hideaki Kaneto et al.

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 28 September 2009
                : 13 November 2009
                Categories
                Review Article

                Immunology
                Immunology

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