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• W2000655324 abstract "Exposure to heavy metal lead (Pb(2+)) has been reported to cause problems in cognitive functions of the brain, e.g. memory loss and difficulties in mental development. N-Methyl-D-aspartate receptors (NRs) are important molecules that are known to be involved in mediation of learning and memory. In order to investigate the effects of Pb(2+) on the gene expression of NR1 and NR2B subunits in neurons, primary cell cultures of rat cortical and hippocampal neurons were employed. After treatments with different concentrations of Pb(2+) ions in culture medium (0, 5, 10, 25 and 50 microM), the cellular localization of Pb(2+) in neurons was evaluated by laser scan confocal microscopy by using a Pb(2+) ion specific fluorescence probe. In addition, the gene expression of NR1 and NR2B subunits was determined by reverse transcriptase-polymerase chain reaction, immunofluorescence and Western blotting. The results of the present study showed that both cortical and hippocampal neurons accumulated intracellular Pb(2+) in accordance with the concentrations of Pb(2+) ions present in the culture medium. After Pb(2+) treatments, levels of NR1 mRNA, immunoreactivity and protein were found to be unchanged but levels of NR2B mRNA, immunoreactivity and protein were found to be significantly increased in cortical neurons. In contrast, both NR1 and NR2B mRNAs, immunoreactivity and proteins were found to be significantly decreased in hippocampal neurons. The changes in gene expression were found to be dose dependent in accordance with the Pb(2+) concentrations. The present results indicate that Pb(2+) has a differential effect on the expression of NR1 and NR2B subunits in cortical and hippocampal neurons, respectively. It is likely that the toxic effects of Pb(2+) may cause differential damage to different types of memory that are mediated by cortical and hippocampal neurons, respectively." @default.
• W2000655324 created "2016-06-24" @default.
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• W2000655324 date "2002-04-01" @default.
• W2000655324 modified "2023-09-26" @default.
• W2000655324 title "Different trends in modulation of NMDAR1 and NMDAR2B gene expression in cultured cortical and hippocampal neurons after lead exposure" @default.
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• W2000655324 doi "https://doi.org/10.1016/s0006-8993(01)03395-9" @default.
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