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Nutrients 2018, 10(2), 159; https://doi.org/10.3390/nu10020159

Sexual Dimorphism in the Selenocysteine Lyase Knockout Mouse

Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, 651 Ilalo St., Honolulu, HI 96813, USA
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Received: 23 December 2017 / Revised: 19 January 2018 / Accepted: 29 January 2018 / Published: 31 January 2018
(This article belongs to the Special Issue Selenium and Selenoproteins in Environment, Health and Disease)
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Abstract

Selenium (Se) is an essential micronutrient known for its antioxidant properties and health benefits, attributed to its presence in selenoproteins as the amino acid, selenocysteine. Selenocysteine lyase (Scly) catalyzes hydrolysis of selenocysteine to selenide and alanine, facilitating re-utilization of Se for de novo selenoprotein synthesis. Previously, it was reported that male Scly−/− mice develop increased body weight and body fat composition, and altered lipid and carbohydrate metabolism, compared to wild type mice. Strikingly, females appeared to present with a less severe phenotype, suggesting the relationship between Scly and energy metabolism may be regulated in a sex-specific manner. Here, we report that while body weight and body fat gain occur in both male and female Scly−/− mice, strikingly, males are susceptible to developing glucose intolerance, whereas female Scly−/− mice are protected. Because Se is critical for male reproduction, we hypothesized that castration would attenuate the metabolic dysfunction observed in male Scly−/− mice by eliminating sequestration of Se in testes. We report that fasting serum insulin levels were significantly reduced in castrated males compared to controls, but islet area was unchanged between groups. Finally, both male and female Scly−/− mice exhibit reduced hypothalamic expression of selenoproteins S, M, and glutathione peroxidase 1. View Full-Text
Keywords: Scly; selenium; selenoproteins Scly; selenium; selenoproteins
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Ogawa-Wong, A.N.; Hashimoto, A.C.; Ha, H.; Pitts, M.W.; Seale, L.A.; Berry, M.J. Sexual Dimorphism in the Selenocysteine Lyase Knockout Mouse. Nutrients 2018, 10, 159.

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