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      Effect of Treatment of Sprague Dawley Rats with AVE7688, Enalapril, or Candoxatril on Diet-Induced Obesity

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          Abstract

          The objective of this study was to determine the effect of AVE7688, a drug that inhibits both angiotensin converting enzyme (ACE) and neutral endopeptidase (NEP) activity, on neural and vascular defects caused by diet induced obesity (DIO). Rats at 12 weeks of age were fed a standard or high fat diet with or without AVE7688 for 24 weeks. DIO rats had impaired glucose tolerance and developed sensory neuropathy. Vascular relaxation to acetylcholine and calcitonin gene-related peptide was decreased in epineurial arterioles of DIO rats. Rats fed a high fat diet containing AVE7688 did not become obese and vascular and sensory nerve dysfunction and impaired glucose tolerance were improved. DIO is associated with increased expression of NEP in epineurial arterioles. NEP degrades vasoactive peptides which may explain the decrease in neurovascular function in DIO.

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          Natriuretic Peptides/cGMP/cGMP-Dependent Protein Kinase Cascades Promote Muscle Mitochondrial Biogenesis and Prevent Obesity

          Kazutoshi Miyashita, Hiroshi Itoh, Hirokazu Tsujimoto … (2009)
          OBJECTIVE Natriuretic peptides (NPs) have been characterized as vascular hormones that regulate vascular tone via guanylyl cyclase (GC), cyclic GMP (cGMP), and cGMP-dependent protein kinase (cGK). Recent clinical studies have shown that plasma NP levels were lower in subjects with the metabolic syndrome. The present study was conducted to elucidate the roles for NP/cGK cascades in energy metabolism. RESEARCH DESIGN AND METHODS We used three types of genetically engineered mice: brain NP (BNP) transgenic (BNP-Tg), cGK-Tg, and guanylyl cyclase-A (GCA) heterozygous knockout (GCA+/−) mice and analyzed the metabolic consequences of chronic activation of NP/cGK cascades in vivo. We also examined the effect of NPs in cultured myocytes. RESULTS BNP-Tg mice fed on high-fat diet were protected against diet-induced obesity and insulin resistance, and cGK-Tg mice had reduced body weight even on standard diet; surprisingly, giant mitochondria were densely packed in the skeletal muscle. Both mice showed an increase in muscle mitochondrial content and fat oxidation through upregulation of peroxisome proliferator–activated receptor (PPAR)-γ coactivator (PGC)-1α and PPARδ. The functional NP receptors, GCA and guanylyl cyclase-B, were downregulated by feeding a high-fat diet, while GCA+/− mice showed increases in body weight and glucose intolerance when fed a high-fat diet. NPs directly increased the expression of PGC-1α and PPARδ and mitochondrial content in cultured myocytes. CONCLUSIONS The findings together suggest that NP/cGK cascades can promote muscle mitochondrial biogenesis and fat oxidation, as to prevent obesity and glucose intolerance. The vascular hormone, NP, would contribute to coordinated regulation of oxygen supply and consumption.
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            Mechanisms of Disease: endothelial dysfunction in insulin resistance and diabetes.

            C Rask, Paul King (2006)
            Endothelial dysfunction is one manifestation of the many changes induced in the arterial wall by the metabolic abnormalities accompanying diabetes and insulin resistance. In type 1 diabetes, endothelial dysfunction is most consistently found in advanced stages of the disease. In other patients, it is associated with nondiabetic insulin resistance and probably precedes type 2 diabetes. In obesity and insulin resistance, increased secretion of proinflammatory cytokines and decreased secretion of adiponectin from adipose tissue, increased circulating levels of free fatty acids, and postprandial hyperglycemia can all alter gene expression and cell signaling in vascular endothelium, cause vascular insulin resistance, and change the release of endothelium-derived factors. In diabetes, sustained hyperglycemia causes increased intracellular concentrations of glucose metabolites in endothelial cells. These changes cause mitochondrial dysfunction, increased oxidative stress, and activation of protein kinase C. Dysfunctional endothelium displays activation of vascular NADPH oxidase, uncoupling of endothelial nitric oxide synthase, increased expression of endothelin 1, a changed balance between the production of vasodilator and vasoconstrictor prostanoids, and induction of adhesion molecules. This review describes how these and other changes influence endothelium-dependent vasodilation in patients with insulin resistance and diabetes. The clinical utility of endothelial function testing and future therapeutic targets is also discussed.
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              Microvascular complications of impaired glucose tolerance.

              Rosalyn J. Singleton, Melanie Ferguson, Adina L. Feldman … (2003)
              Impaired glucose tolerance (IGT) serves as a marker for the state of insulin resistance and predicts both large- and small-vessel vascular complications, independent of a patient's progression to diabetes. Patients with IGT are at significantly increased risk for death and morbidity due to myocardial infarction, stroke, and large-vessel occlusive disease. IGT is more predictive of cardiovascular morbidity than impaired fasting glucose, probably because it is a better surrogate for the state of insulin resistance. IGT is also independently associated with traditional microvascular complications of diabetes, including retinopathy, renal disease, and polyneuropathy, which are the topics of this review. Inhibition of nitric oxide-mediated vasodilation, endothelial injury due to increased release of free fatty acids and adipocytokines from adipocytes, and direct metabolic injury of endothelial and end-organ cells contribute to vascular complications. Early detection of IGT allows intensive diet and exercise modification, which has proven significantly more effective than drug therapy in normalizing postprandial glucose and inhibiting progression to diabetes. To what degree intervention will limit recognized complications is not known.
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Obes
                Journal ID (publisher-id): JOBES
                Title: Journal of Obesity
                Publisher: Hindawi Publishing Corporation
                ISSN (Print): 2090-0708
                ISSN (Electronic): 2090-0716
                Publication date (Print): 2011
                Publication date (Electronic): 16 August 2010
                Volume: 2011
                Electronic Location Identifier: 686952
                Affiliations
                1Veteran Affairs Medical Center, Iowa City, IA 52246, USA
                2Department of Internal Medicine, The University of Iowa, Iowa City, IA 52242, USA
                Author notes

                Academic Editor: A. Halpern

                Article
                DOI: 10.1155/2011/686952
                PMC ID: 2933895
                PubMed ID: 20847891
                SO-VID: 8aad1047-7895-421e-baef-6da47162eac6
                Copyright © Copyright © 2011 Eric P. Davidson et al.
                License:

                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
                Date received : 21 April 2010
                Date accepted : 29 June 2010
                Categories
                Subject: Research Article

                ScienceOpen disciplines: Nutrition & Dietetics
                Data availability:
                ScienceOpen disciplines: Nutrition & Dietetics

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