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      Effects of Late Gestational Fetal Exposure to Dexamethasone Administration on the Postnatal Hypothalamus-Pituitary-Adrenal Axis Response to Hypoglycemia in Pigs

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          Abstract

          Background: Prenatal glucocorticoid administration alters the activity of the fetal hypothalamic-pituitary-adrenocortical axis (HPAA), and correspondingly the adenocorticotropic hormone (ACTH) and cortisol levels after birth. The dosages required for these effects are critically discussed. Activation of the HPAA is related to metabolic syndrome and diabetes mellitus. Hypoglycemia is the classic side effect of antidiabetic treatment. We hypothesized that a low dosage of dexamethasone in late pregnancy alters the HPAA response to hypoglycemia in pigs. Methods: 12 pregnant sows were randomly assigned to two groups which received either a low-dose intramuscular injection (99th and 100th day of gestation) of dexamethasone (0.06 μg/kg body weight) or vehicle. Three months after birth, 18 dexamethasone-treated anaesthetized offspring and 12 control offspring underwent a 75 min hypoglycemic clamp (blood glucose below 4 mmol/L) procedure. Heart rate (HR), blood pressure, ACTH and cortisol levels and body weight (at birth and after three months) were recorded. Results: Dexamethasone-treated animals exhibited significantly elevated ACTH (139.9 ± 12.7 pg/mL) and cortisol (483.1 ± 30.3 nmol/L) levels during hypoglycemia as compared to the control group (41.7 ± 6.5 pg/mL and 257.9 ± 26.7 nmol/L, respectively), as well as an elevated HR (205.5 ± 5.7 bpm) and blood pressure (systolic: 128.6 ± 1.5, diastolic: 85.7 ± 0.7 mmHg) response as compared to the control group (153.2 ± 4.5 bpm; systolic: 118.6 ± 1.6, diastolic: 79.5 ± 1.4 mmHg, respectively; p < 0.001). Conclusions: Low-dose prenatal administration of dexamethasone not only exerts effects on the HPAA (ACTH and cortisol concentration) and vital parameters (HR and diastolic blood pressure) under baseline conditions, but also on ACTH, HR and systolic blood pressure during hypoglycemia.

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          Most cited references 37

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          Glucocorticoids, prenatal stress and the programming of disease.

          An adverse foetal environment is associated with increased risk of cardiovascular, metabolic, neuroendocrine and psychological disorders in adulthood. Exposure to stress and its glucocorticoid hormone mediators may underpin this association. In humans and in animal models, prenatal stress, excess exogenous glucocorticoids or inhibition of 11β-hydroxysteroid dehydrogenase type 2 (HSD2; the placental barrier to maternal glucocorticoids) reduces birth weight and causes hyperglycemia, hypertension, increased HPA axis reactivity, and increased anxiety-related behaviour. Molecular mechanisms that underlie the 'developmental programming' effects of excess glucocorticoids/prenatal stress include epigenetic changes in target gene promoters. In the case of the intracellular glucocorticoid receptor (GR), this alters tissue-specific GR expression levels, which has persistent and profound effects on glucocorticoid signalling in certain tissues (e.g. brain, liver, and adipose). Crucially, changes in gene expression persist long after the initial challenge, predisposing the individual to disease in later life. Intriguingly, the effects of a challenged pregnancy appear to be transmitted possibly to one or two subsequent generations, suggesting that these epigenetic effects persist. Copyright © 2010 Elsevier Inc. All rights reserved.
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            The Concepts of Stress and Stress System Disorders

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              Sympathetic nervous activation in obesity and the metabolic syndrome--causes, consequences and therapeutic implications.

              The world wide prevalence of obesity and the metabolic syndrome is escalating. Contrary to earlier experimental evidence, human obesity is characterised by sympathetic nervous activation, with the outflows to both the kidney and skeletal muscle being activated. While the mechanisms responsible for initiating the sympathetic activation remain to be unequivocally elucidated, hyperinsulinemia, obstructive sleep apnoea, increased circulating adipokines, stress and beta adrenergic receptor polymorphisms are implicated. The pattern of sympathetic activation may be the pathophysiological mechanism underpinning much obesity-related illnesses with the consequences including, amongst others, the development of hypertension, insulin resistance, diastolic dysfunction and renal impairment. While diet and exercise are the first line therapy for the treatment of obesity and the metabolic syndrome, pharmacological interventions targeting the sympathetic nervous system, either directly or indirectly are also likely to be of benefit. Importantly, the benefit may not necessarily be weight related but may be associated with a reduction in end organ damage. Copyright 2010 Elsevier Inc. All rights reserved.
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                Author and article information

                Journal
                Int J Mol Sci
                Int J Mol Sci
                ijms
                International Journal of Molecular Sciences
                MDPI
                1422-0067
                27 October 2017
                November 2017
                : 18
                : 11
                Affiliations
                [1 ]Department of Neurology, Jena University Hospital—Friedrich Schiller University, 07747 Jena, Germany; Florian.Rakers@ 123456med.uni-jena.de (F.R.); vorenus@ 123456web.de (M.N.); Matthias.Schwab@ 123456med.uni-jena.de (M.S.)
                [2 ]Orthopaedic Department, Jena University Hospital—Friedrich Schiller University, 07747 Jena, Germany
                [3 ]Reproductive Biology, National Institute of Medical Science and Nutrition, 14000 Mexico City, Mexico; letyrodgon@ 123456hotmail.com
                [4 ]Department of Animal Science, University of Wyoming, Laramie, 82071 WY, USA; Peter.Nathanielsz@ 123456uwyo.edu
                [5 ]Institute of Biology and Immunology of Reproduction, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; danevadoki@ 123456abv.bg
                [6 ]Institute of Medical Statistics, Computer Sciences and Documentation Science, Jena University Hospital—Friedrich Schiller University, 07743 Jena, Germany; Thomas.Lehmann@ 123456med.uni-jena.de
                [7 ]Institute for Biochemistry II, Jena University Hospital—Friedrich Schiller University, 07743 Jena, Germany; Martin.Schmidt@ 123456med.uni-jena.de
                Author notes
                [* ]Correspondence: rene.schiffner@ 123456med.uni-jena.de ; Tel.: +49-36691-81292; Fax: +49-36691-81029
                Article
                ijms-18-02241
                10.3390/ijms18112241
                5713211
                29077038
                © 2017 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                Categories
                Article

                Molecular biology

                hpa axis, acth, cortisol, stress response, hypoglycemia

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