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Nutrients 2014, 6(6), 2478-2492; doi:10.3390/nu6062478

Selenium-Enriched Agaricus bisporus Mushroom Protects against Increase in Gut Permeability ex vivo and Up-Regulates Glutathione Peroxidase 1 and 2 in Hyperthermally-Induced Oxidative Stress in Rats

1
Department of Agriculture and Food Systems, Melbourne School of Land & Environment, Building 142, Parkville Campus, The University of Melbourne, Parkville, Victoria 3010, Australia
2
Department of Anatomy & Neuroscience, Melbourne Medical School, Building 181, Parkville Campus, The University of Melbourne, Parkville, Victoria 3010, Australia
*
Author to whom correspondence should be addressed.
Received: 29 April 2014 / Revised: 28 May 2014 / Accepted: 18 June 2014 / Published: 24 June 2014
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Abstract

Dietary effects of organic Se supplementation in the form of Se-enriched Agaricus bisporus mushroom on ileal mucosal permeability and antioxidant selenoenzymes status in heat induced oxidative stress in rats were evaluated. Acute heat stress (40 °C, 21% relative humidity, 90 min exposure) increased ileum baseline short circuit current (Isc; 2.40-fold) and epithelial conductance (Ge; 2.74-fold). Dietary supplementation with Se-enriched A. bisporus (1 µg Se/g feed) reduced (p < 0.05) ileum Isc and Ge during heat stress to 1.74 and 1.91 fold, respectively, indicating protection from heat stress-induced mucosal permeability increase. The expression of ileum glutathione peroxidase (GPx-) 1 and 2 mRNAs were up-regulated (p < 0.05) by 1.90 and 1.87-fold, respectively, for non-heat stress rats on the Se-enriched diet relative to the control. The interplay between heat stress and dietary Se is complex. For rats on the control diet, heat stress alone increased ileum expression of GPx-1 (2.33-fold) and GPx-2 (2.23-fold) relative to thermoneutral conditions. For rats on the Se-enriched diet, heat stress increased (p < 0.05) GPx-1 expression only. Rats on Se-enriched + α-tocopherol diet exhibited increased expression of both genes (p < 0.05). Thus, dietary Se-enriched A. bisporus protected against increase in ileum permeability and up-regulated GPx-1 and GPx-2 expression, selenoenzymes relevant to mitigating oxidative stress. View Full-Text
Keywords: Se-enriched mushroom; Agaricus bisporus; oxidative stress; heat stress; organic Se; gut permeability; glutathione peroxidise-1; glutathione peroxidise-2; α-tocopherol Se-enriched mushroom; Agaricus bisporus; oxidative stress; heat stress; organic Se; gut permeability; glutathione peroxidise-1; glutathione peroxidise-2; α-tocopherol
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MDPI and ACS Style

Maseko, T.; Dunshea, F.R.; Howell, K.; Cho, H.-J.; Rivera, L.R.; Furness, J.B.; Ng, K. Selenium-Enriched Agaricus bisporus Mushroom Protects against Increase in Gut Permeability ex vivo and Up-Regulates Glutathione Peroxidase 1 and 2 in Hyperthermally-Induced Oxidative Stress in Rats. Nutrients 2014, 6, 2478-2492.

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