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Does lead provoke the peroxidation process in rat brain synaptosomes?

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Molecular and Chemical Neuropathology

Abstract

Up to now there has been no information concerning the effect of lead on the peroxidation process in brain nerve endings. We have examined whether lead acetate (in chronic and acute models of toxicity in vivo and in vitro) affected the levels of free radicals in synaptosomes obtained from rat brain. Simulateneously, we have checked the effect of peroxidation of Pb2+ on brain homogenates and microsomal fraction. Our results indicated that the lead level in synaptosomal fraction obtained from lead-treated rats was much higher than in controls. We did not observe induction of spontaneous and Fe3+-dependent peroxidation either in synaptosomes or in homogenates and brain microsomes after chronic and acute lead administration to the rats. Lead itself also did not enhance both processes when added in vitro to the control brain synaptosomes in micromolar concentrations. The lack of the lead effect on the peroxidation process in subcellular fractions of brain was rather surprising, because lead is known to be the accelerator of Fe3+-dependent peroxidation processes in liver. Additionally, livers from rats under the same toxicity conditions were examined. We have found that lead did not provoke spontaneous peroxidation in liver, but contrary to brain fractions, it drastically increased iron-dependent peroxidation in liver homogenates and microsomes. The lack of the effect of lead on inducing peroxidation processes in brain is probably the consequence of the brain having stronger protective mechanisms against its toxicity than the liver.

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Authors and Affiliations

  1. Department of Neurochemistry, Medical Research Centre, Polish Academy of Sciences, Dworkowa 3, 00-784, Warsaw, Poland

    Beata Dąbrowska-Bouta, Lidia Struzyńska & Urszula Rafałowska

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  1. Beata Dąbrowska-Bouta
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  2. Lidia Struzyńska
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  3. Urszula Rafałowska
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Dąbrowska-Bouta, B., Struzyńska, L. & Rafałowska, U. Does lead provoke the peroxidation process in rat brain synaptosomes?. Molecular and Chemical Neuropathology 29, 127–139 (1996). https://doi.org/10.1007/BF02814997

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  • DOI: https://doi.org/10.1007/BF02814997

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