diabetic angiopathies/tyrosine

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High glucose induced human umbilical vein endothelial cell injury: involvement of protein tyrosine nitration.

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The dysfunction and further damage of endothelium play an important role in the development and progression of diabetic vascular complications. Protein tyrosine nitration is involved in endothelial cell injury induced by high glucose. Little is known about protein nitration in human umbilical vein

A hydroxyl radical-like species oxidizes cynomolgus monkey artery wall proteins in early diabetic vascular disease.

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Recent evidence argues strongly that the marked increase in risk for atherosclerotic heart disease seen in diabetics cannot be explained by a generalized increase in oxidative stress. Here, we used streptozotocin to induce hyperglycemia in cynomolgus monkeys for 6 months and tested whether high

High glucose induced rat aorta vascular smooth muscle cell oxidative injury: involvement of protein tyrosine nitration.

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The alteration and further damage of vascular smooth muscle function have been implicated in the development of vascular complications and diabetes. Little is known about protein tyrosine nitration in vascular smooth muscle cell injury induced by high glucose. In this article, vascular smooth muscle

High glucose via peroxynitrite causes tyrosine nitration and inactivation of prostacyclin synthase that is associated with thromboxane/prostaglandin H(2) receptor-mediated apoptosis and adhesion molecule expression in cultured human aortic endothelial cells.

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Loss of the modulatory role of the endothelium may be a critical initial factor in the development of diabetic vascular diseases. Exposure of human aortic endothelial cells (HAECs) to high glucose (30 or 44 mmol/l) for 7-10 days significantly increased the release of superoxide anion in response to

A protein tyrosine kinase inhibitor, imatinib mesylate (Gleevec), improves erectile and vascular function secondary to a reduction of hyperglycemia in diabetic rats.

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BACKGROUND Erectile dysfunction (ED) afflicts 50% of diabetic men, many of whom experience poor results with phosphodiesterase type 5 inhibitors. The protein tyrosine kinase (PTK) inhibitor imatinib (Gleevec, Novartis Pharmaceuticals, Basel, Switzerland) has therapeutic potential in diabetic men by

1H Nuclear Magnetic Resonance (NMR)-Based Cerebrospinal Fluid and Plasma Metabolomic Analysis in Type 2 Diabetic Patients and Risk Prediction for Diabetic Microangiopathy.

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Insulin resistance and metabolic derangement are present in patients with type 2 diabetes mellitus (T2DM). However, the metabolomic signature of T2DM in cerebrospinal fluid (CSF) has not been investigated thus far. In this prospective metabolomic study, fasting CSF and plasma samples from 40 T2DM

Part I: pathogenetic role of peroxynitrite in the development of diabetes and diabetic vascular complications: studies with FP15, a novel potent peroxynitrite decomposition catalyst.

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BACKGROUND Peroxynitrite is a cytotoxic oxidant formed from nitric oxide (NO) and superoxide. Tyrosine nitration, a footprint of peroxynitrite, has been demonstrated in the pancreatic islets as well as in the cardiovascular system of diabetic subjects. Delineation of the pathogenetic role of

Endothelial nitric oxide synthase-dependent tyrosine nitration of prostacyclin synthase in diabetes in vivo.

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There is evidence that reactive nitrogen species are implicated in diabetic vascular complications, but their sources and targets remain largely unidentified. In the present study, we aimed to study the roles of endothelial nitric oxide synthase (eNOS) in diabetes. Exposure of isolated bovine

Insulin-like growth factor I plasmid therapy promotes in vivo angiogenesis.

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Angiogenesis, the formation of neovessels from the endothelium of preexisting vessels, is stimulated by soluble angiogenic factors. Insulin-like growth factor I (IGF-I) stimulates myogenesis and induces nerve regeneration after injury, and it has been shown to stimulate angiogenesis. However, the in

Advanced glycation end product Nε-carboxymethyllysine induces endothelial cell injury: the involvement of SHP-1-regulated VEGFR-2 dephosphorylation.

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N(ε)-carboxymethyllysine (CML), a major advanced glycation end product, plays a crucial role in diabetes-induced vascular injury. The roles of protein tyrosine phosphatases and vascular endothelial growth factor (VEGF) receptors in CML-related endothelial cell injury are still unclear. Human

Changes of insulin receptor in aortic endothelial cells from diabetic rats.

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Endothelial cells are likely to play an important role in the development of diabetic vascular diseases since they are exposed directly to the abnormal circulating metabolites of diabetes and may be easily damaged early in the natural course of vascular complications. Recently, we have demonstrated

Insulin-like growth factor-I receptor increases in aortic endothelial cells from diabetic rats.

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Endothelial cells are likely to play an important role in the development of diabetic vascular diseases, since they are exposed directly to the abnormal circulating metabolites of diabetes and may be easily damaged early in the natural course of vascular complications. In this study, aortic

Advanced glycation end products-driven angiogenesis in vitro. Induction of the growth and tube formation of human microvascular endothelial cells through autocrine vascular endothelial growth factor.

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This study was undertaken to determine whether and how advanced glycation end products (AGE), senescent macroproteins accumulated in various tissues under hyperglycemic states, cause angiogenesis, the principal vascular derangement in diabetic microangiopathy. We first prepared AGE-bovine serum

Impact of mitochondrial ROS production in the pathogenesis of insulin resistance.

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Tumor necrosis factor-alpha (TNF-alpha) inhibits insulin action, in part, by activating c-jun NH(2)-terminal kinases (JNK). However, the precise mechanisms by which TNF-alpha activates JNK are unknown. Recently, we confirmed that hyperglycemia increased mitochondrial reactive oxygen species (ROS)

Nitrotyrosine: new findings as a marker of postprandial oxidative stress.

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Oxidative stress plays an important role in diabetic vascular complications. It has been shown that an imbalance in the ratio of nitric oxide to superoxide anion due to a prevalence of the superoxide anion leads to an alteration in vascular reactivity. Under these conditions an increase in

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