Short-term heat stress alters redox balance in porcine skeletal muscle

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dc.contributor.authorVolodina, Olgaen
dc.contributor.authorGanesan, Shanthien
dc.contributor.authorPearce, Sarah C.en
dc.contributor.authorGabler, Nicholas K.en
dc.contributor.authorBaumgard, Lance H.en
dc.contributor.authorRhoads, Robert P.en
dc.contributor.authorSelsby, Joshua T.en
dc.contributor.departmentAnimal and Poultry Sciencesen
dc.date.accessioned2019-08-28T16:26:07Zen
dc.date.available2019-08-28T16:26:07Zen
dc.date.issued2017-04en
dc.description.abstractHeat stress contributes to higher morbidity and mortality in humans and animals and is an agricultural economic challenge because it reduces livestock productivity. Redox balance and associated mitochondrial responses appear to play a central role in heat stress-induced skeletal muscle pathology. We have previously reported increased oxidative stress and mitochondrial content in oxidative muscle following 12h of heat stress. The purposes of this investigation were to characterize heat stress-induced oxidative stress and changes in mitochondrial content and biogenic signaling in oxidative skeletal muscle. Crossbred gilts were randomly assigned to either thermal neutral (21 degrees C; n=8, control group) or heat stress (37 degrees C) conditions for 2h (n=8), 4h (n=8), or 6h (n=8). At the end, their respective environmental exposure, the red portion of the semitendinosus muscle (STR) was harvested. Heat stress increased concentration of malondialdehyde (MDA) following 2 and 4h compared to thermal neutral and 6h, which was similar to thermal neutral, and decreased linearly with time. Protein carbonyl content was not influenced by environment. Catalase activity was increased following 4h of heat stress and superoxide dismutase activity was decreased following 6h of heat stress compared to thermal neutral conditions. Heat stress-mediated changes in antioxidant activity were independent of altered protein abundance or transcript expression. Mitochondrial content and mitochondrial biogenic signaling were similar between groups. These data demonstrate that heat stress caused a transient increase in oxidative stress that was countered by a compensatory change in catalase activity. These findings contribute to our growing understanding of the chronology of heat stress-induced intracellular dysfunctions in skeletal muscle.en
dc.description.notesThis work was supported by USDA grants 2014-67015-21627 (J. T. S.) and 2011-6700330007 (L. H. B.).en
dc.description.sponsorshipUSDA grants [2014-67015-21627, 2011-6700330007]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.14814/phy2.13267en
dc.identifier.issn2051-817Xen
dc.identifier.issue8en
dc.identifier.othere13267en
dc.identifier.pmid28455453en
dc.identifier.urihttp://hdl.handle.net/10919/93281en
dc.identifier.volume5en
dc.language.isoenen
dc.publisherThe Physiological Societyen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectHeat strokeen
dc.subjecthyperthermiaen
dc.subjectmitochondriaen
dc.subjectoxidative stressen
dc.subjectpigen
dc.titleShort-term heat stress alters redox balance in porcine skeletal muscleen
dc.title.serialPhysiological Reportsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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