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- W2008795616 abstract "The purpose of the present study was to examine the effect of chronic hypoxia on N-methyl-D-aspartate-mediated cellular responses in differentiated PC12 cells. PC12 cells were differentiated by treatment with nerve growth factor. Patch-clamp analysis in differentiated PC12 cells showed that extracellularly applied N-methyl-D-aspartate induced an inward current that was abolished by the presence of the N-methyl-D-aspartate receptor antagonist MK-801. Results from Ca(2+) imaging experiments showed that N-methyl-D-aspartate induced an elevation in intracellular free Ca(2+) which was also abolished by MK-801. We also examined the effect of hypoxia on the N-methyl-D-aspartate-induced current in nerve growth factor-treated cells. We found that the N-methyl-D-aspartate-induced inward current and the N-methyl-D-aspartate-induced elevation in intracellular free Ca(2+) were markedly attenuated by chronic hypoxia. We next examined the possibility that the reduced N-methyl-D-aspartate responsiveness was due to down-regulation of N-methyl-D-aspartate receptor levels. Northern blot and immunoblot analyses showed that both messenger RNA and protein levels for N-methyl-D-aspartate receptor subunit 1 were markedly decreased during hypoxia. However, the messenger RNA for N-methyl-D-aspartate receptor subunit 2C was increased, whereas the protein level for subunit 2C did not change. Our results indicate that differentiated PC12 cells express functional N-methyl-D-aspartate receptors and that chronic exposure to hypoxia attenuates the N-methyl-D-aspartate-induced Ca(2+) accumulation in these cells via down-regulation of N-methyl-D-aspartate receptor subunit 1. This mechanism may play an important role in protecting PC12 cells against hypoxic stress." @default.
- W2008795616 created "2016-06-24" @default.
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- W2008795616 date "2000-11-01" @default.
- W2008795616 modified "2023-10-15" @default.
- W2008795616 title "Regulation of N-methyl-d-aspartate receptor expression and N-methyl-d-aspartate-induced cellular response during chronic hypoxia in differentiated rat PC12 cells" @default.
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- W2008795616 doi "https://doi.org/10.1016/s0306-4522(00)00435-8" @default.
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