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Natural mineral-rich water ingestion by ovariectomized fructose-fed Sprague-Dawley rats: effects on sirtuin 1 and glucocorticoid signaling pathways

Das, Jugal Kishore MSc1,2; Severo, Milton PhD3,4; Pereira, Cidália Dionísio PhD1,5; Patrício, Emília MD6; Magalhães, José PhD7; Monteiro, Rosário PhD1,8; Neves, Delminda PhD8,9; Martins, Maria João PhD1,8

doi: 10.1097/GME.0000000000000780
Original Articles

Objective: Prevention or induction of metabolic disorders and obesity depend on estrogen signaling and/or exogenous factors, such as mineral content in diet. The protective effects of a Portuguese natural mineral-rich water against the induction of metabolic syndrome in fructose-fed male Sprague-Dawley rats have been reported. The present study was designed to assess the impact of this mineral-rich water on fructose-fed estrogen-deficient female Sprague-Dawley rats.

Methods: Ovariectomized rats had access to tap (TWO) or mineral-rich (MWO) waters, with and without 10% fructose (10-wk treatment). A sham-operated (tap water supplied) group was included and each of the five groups included six rats. Plasma biochemical and metabolic parameters were evaluated by routine clinical measurements. Western blotting was used to assess hepatic protein expression of sirtuins (Sirt) 1 and 3, phosphorylated AMP-activated protein kinase-α (p-AMPKα), peroxisome proliferator-activated receptor gamma coactivator-1-α (PGC1α), glucocorticoid receptor, and 11beta-hydroxysteroid dehydrogenase type 1 (11βHSD1).

Results: Ovariectomy increased plasma total cholesterol (46%/P < 0.05), but had no significant effects on hepatic protein expression. Fructose intake by ovariectomized rats increased PGC1α and 11βHSD1 (fructose in tap water [TWFO] vs TWO: 65%/P < 0.05 and 38%/P = 0.05, respectively) as well as glucocorticoid receptor (TWFO and fructose in natural mineral-rich water [MWFO] vs TWO and MWO: 107%/P = 0.05 and 182%/P < 0.05, respectively). Mineral-rich water ingestion exerted an increasing shape on Sirt1 (MWO vs TWO: 76%/P < 0.05; MWFO vs TWFO: 76%/P = 0.06), PGC1α (MWO vs TWO: 77%/P < 0.01), p-AMPKα (MWO vs TWO: 152%/P = 0.01; MWFO vs TWFO: 107%/P = 0.01), and 11βHSD1 (MWO vs TWO: 91%/P = 0.05; MWFO vs TWFO: 47%/P = 0.05).

Conclusions: Mineral-rich water ingestion may have a prime role on the activation of Sirt1 signaling and the modulation of glucocorticoid signaling in the postmenopause.

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1Department of Biochemistry, Faculty of Medicine, University of Porto, Porto, Portugal

2School of Biotechnology, KIIT University, Bhubaneswar, India

3Department of Clinical Epidemiology, Predictive Medicine and Public Health, Faculty of Medicine, University of Porto, Porto, Portugal

4Unidade de Investigação em Epidemiologia (EPIUnit), Instituto de Saúde Pública, University of Porto, Porto, Portugal

5Escola Superior de Saúde, Instituto Politécnico de Leiria, Campus 2 - Morro de Lena - Alto do Vieiro, Leiria, Portugal

6Clinical Pathology Department of São João Hospital Centre, Porto, Portugal

7CIAFEL - Research Centre in Physical Activity, Health and Leisure, Faculty of Sport, University of Porto, Porto, Portugal

8Instituto de Investigação e Inovação em Saúde (i3 s), University of Porto, Porto, Portugal

9Department of Experimental Biology, Faculty of Medicine, University of Porto, Porto, Portugal.

Address correspondence to: Jugal Kishore Das, MSc, Department of Biochemistry, Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal. E-mail: das.jugal.86@gmail.com

Received 30 May, 2016

Revised 7 September, 2016

Accepted 7 September, 2016

Funding/support: The study was funded by Fundação para a Ciência e a Tecnologia (project reference: UID/BIM/04293/2013), Erasmus Mundus Euphrates (project reference: 2013-2540/001-001), and Unicer Bebidas, S.A. When considering the partial funding by Unicer Bebidas, S.A., it is important to mention that the study here presented was developed, in its full extent, both in scientific terms and research equipment conditions, independently of this company.

Financial disclosure/conflicts of interest: None reported.

Supplemental digital content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal's Website (www.menopause.org).

© 2017 by The North American Menopause Society.