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Hepatic 11 beta-hydroxysteroid dehydrogenase 1 involvement in alterations of glucose metabolism produced by acidotic stress in rat

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Abstract

11 beta-hydroxysteroid dehydrogenase (HSDs) enzymes regulate the activity of glucocorticoids in target organs. HSD1, one of the two existing isoforms, locates mainly in CNS, liver and adipose tissue. HSD1 is involved in the pathogenesis of diseases such as obesity, insulin resistance, arterial hypertension and the Metabolic Syndrome. The stress produced by HCl overload triggers metabolic acidosis and increases liver HSD1 activity associated with increased phosphoenolpyruvate carboxykinase, a regulatory enzyme of gluconeogenesis that is activated by glucocorticoids, with increased glycaemia and glycogen breakdown. The aim of this study was to analyze whether the metabolic modifications triggered by HCl stress are due to increased liver HSD1 activity. Glycyrrhetinic acid, a potent HDS inhibitor, was administered subcutaneously (20 mg/ml) to stressed and unstressed four months old maleSprague Dawley rats to investigate changes in liver HSD1, phosphoenolpyruvate carboxykinase (PECPK) and glycogen phosphorylase activities and plasma glucose levels. It was observed that all these parameters increased in stressed animals, but that treatment with glycyrrhetinic acid significantly reduced their levels. In conclusion, our results demonstrate the involvement of HSD1 in stress induced carbohydrate disturbances and could contribute to the impact of HSD1 inhibitors on carbohydrate metabolism and its relevance in the study of Metabolic Syndrome Disorder and non insulin-dependent diabetes mellitus.

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Authors and Affiliations

  1. Laboratorio de Fisiología Endocrina, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina

    M. E. Altuna, L. F. Rago & M. C. Damasco

  2. Laboratorio de Disturbios Metabólicos por Xenobióticos, Salud Humana y Medio Ambiente (DIMXSA), Departamento de Química Biológica Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EGA, Buenos Aires, Argentina

    M. B. Mazzetti & L. C. San Martín de Viale

Authors
  1. M. E. Altuna
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  2. M. B. Mazzetti
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  3. L. F. Rago
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  4. L. C. San Martín de Viale
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  5. M. C. Damasco
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Correspondence to M. C. Damasco.

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Altuna, M.E., Mazzetti, M.B., Rago, L.F. et al. Hepatic 11 beta-hydroxysteroid dehydrogenase 1 involvement in alterations of glucose metabolism produced by acidotic stress in rat. J Physiol Biochem 65, 329–337 (2009). https://doi.org/10.1007/BF03185927

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  • DOI: https://doi.org/10.1007/BF03185927

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