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 Jun 24;6(6):2478-92. Epub 2014 Jun 24.

Department of Agriculture and Food Systems, Melbourne School of Land & Environment, Building 142, Parkville Campus, The University of Melbourne, Parkville, Victoria 3010, Australia.

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.

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Source
http://www.mdpi.com/2072-6643/6/6/2478
Publisher Site
http://dx.doi.org/10.3390/nu6062478DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4073163PMC
June 2014
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Am. J. Physiol. 1998
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Furness et al.
Nat. Rev. Gastroenterol. Hepatol. 2013
Acute stressors stimulate ion secretion and increase epithelial permeability in rat intestine
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Am. J. Physiol. 1994

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