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Dark-Phase Light Contamination Disrupts Circadian Rhythms in Plasma Measures of Endocrine Physiology and Metabolism in Rats

机译:暗相光污染破坏大鼠内分泌生理和代谢的血浆指标中的昼夜节律

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Dark-phaselightcontaminationcansignificantlydisruptchronobiologicrhythms,therebypotentiallyalteringtheendocrinephysiologyandmetabolismofexperimentalanimalsandinfluencingtheoutcomeofscientificinvestigations.Wesoughttodeterminewhetherexposuretolow-levellightcontaminationduringthedarkphaseinfluencedthenormallyentrainedcircadianrhythmsofvarioussubstancesinplasma.MaleSprague#8211;Dawleyrats(n=6pergroup)werehousedinphotobiologiclight-exposurechambersconfiguredtocreate1)a12:12-hlight:darkcyclewithoutdark-phaselightcontamination(controlcondition;123#59157;W/cmsupxmlns="http://pub2web.metastore.ingenta.coms/"2/sup,lightsonat0600),2)experimentalexposuretoalowleveloflightduringthe12-hdarkphase(with0.02,0.05,0.06,or0.08#59157;W/cmsupxmlns="http://pub2web.metastore.ingenta.coms/"2/suplightatnight),or3)constantbrightlight(123#59157;W/cmsupxmlns="http://pub2web.metastore.ingenta.coms/"2/sup).Dietaryandwaterintakeswererecordeddaily.After2wk,ratsunderwent6low-volumeblooddrawsat4-hintervals(beginningat0400)duringboththelightanddarkphases.Circadianrhythmsindietaryandwaterintakeandlevelsofplasmatotalfattyacidsandlipidfractionsremainedentrainedduringexposuretoeithercontrolconditionsorlow-intensitylightduringthedarkphase.However,thesepatternsweredisruptedinratsexposedtoconstantbrightlight.Circadianpatternsofplasmamelatonin,glucose,lacticacid,andcorticosteroneweremaintainedinallratsexceptthoseexposedtoconstantbrightlightorthehighestleveloflightduringthedarkphase.Thereforeevenminimallightcontaminationduringthedarkphasecandisruptnormalcircadianrhythmsofendocrinemetabolismandphysiologyandmayaltertheoutcomeofscientificinvestigations.
机译:暗phaselightcontaminationcansignificantlydisruptchronobiologicrhythms,therebypotentiallyalteringtheendocrinephysiologyandmetabolismofexperimentalanimalsandinfluencingtheoutcomeofscientificinvestigations.Wesoughttodeterminewhetherexposuretolow-levellightcontaminationduringthedarkphaseinfluencedthenormallyentrainedcircadianrhythmsofvarioussubstancesinplasma.MaleSprague#8211; Dawleyrats(N = 6pergroup)werehousedinphotobiologiclight-exposurechambersconfiguredtocreate1)A12:12-hlight:darkcyclewithoutdark-phaselightcontamination(ControlCondition资料; 123#59157; W /厘米2,lightsonat0600),2)在12-hdark阶段(具有0.02、0.05、0.06或0.08#59157; k / s 2 lightatnight)或3)constantbrightlight(123#59157; W / cm 2 )。每天记录饮食和进水。2周后,大鼠接受4次低量采血rvals(beginningat0400)duringboththelightanddarkphases.Circadianrhythmsindietaryandwaterintakeandlevelsofplasmatotalfattyacidsandlipidfractionsremainedentrainedduringexposuretoeithercontrolconditionsorlow-intensitylightduringthedarkphase.However,thesepatternsweredisruptedinratsexposedtoconstantbrightlight.Circadianpatternsofplasmamelatonin,葡萄糖,乳酸,andcorticosteroneweremaintainedinallratsexceptthoseexposedtoconstantbrightlightorthehighestleveloflightduringthedarkphase.Thereforeevenminimallightcontaminationduringthedarkphasecandisruptnormalcircadianrhythmsofendocrinemetabolismandphysiologyandmayaltertheoutcomeofscientificinvestigations。

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