Cytotoxicity of aluminum oxide nanoparticles on Allium cepa root tip—effects of oxidative stress generation and biouptake

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2015-06-02 00:00 236阅读次数

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• Cytotoxicity of aluminum oxide nanoparticles on Allium cepa root tip—effects of oxidative stress generation and biouptake

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  2015-06-02 00:00

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• Cytotoxicity of aluminum oxide nanoparticles on Allium cepa root tipeffects of oxidative stress gen

  ThecommercialusageofAl2O3nanoparticles(Al2O3NPs)hasgoneupsignificantlyintherecenttimes,enhancingtheriskofenvironmentalcontaminationwiththeseagentsandtheirconsequentadverseeffectsonlivingsystems.ThecurrentstudyhasbeendesignedtoevaluatethecytogeneticpotentialofAl2O3NPsinAlliumcepa(roottipcells)atarangeofexposureconcentrations(0.01,0.1,1,10,and100μg/mL),theiruptake/internalizationprofile,andtheoxidativestressgenerated.Wenotedadose-dependentdecreaseinthemitoticindex(42to28%)andanincreaseinthenumberofchromosomalaberrations.Variouschromosomalaberrations,e.g.sticky,multipolarandlaggardchromosomes,chromosomalbreaks,andtheformationofbinucleatecells,wereobservedbyoptical,fluorescence,andconfocallaserscanningmicroscopy.FT-IRanalysisdemonstratedthesurfacechemicalinteractionbetweenthenanoparticlesandroottipcells.ThebiouptakeofAl2O3inparticulateformledtoreactiveoxygenspeciesgeneration,whichinturnprobablycontributedtotheinductionofchromosomalaberrations.[详细]

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