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- W2022987531 abstract "Chronic stimulation of cerebellar granule cells with N-methyl-D-aspartate (NMDA) or KCl induces a specific activation of the enzymes directly involved in glutamate neurotransmitter synthesis. Phosphate-activated glutaminase (PAG) activity is enhanced in cultured granule neurons incubated with 150 μM NMDA or 25 mM KCl. Other enzymes are not affected by this treatment like lactate dehydrogenase (LDH) and glutamate dehydrogenase (GLDH), which is also a mitochondrial enzyme but not directly involved in neurotransmitter synthesis. This effect is dependent on protein synthesis and is induced after 12 hr of NMDA or KCl stimulation. Kinetics of PAG activity showed that Km values were unaffected, in contrast to Vmax values that were increased approximately 70% and 215% over control by NMDA and KCl treatment, respectively. For GLDH, we found two isoforms that were affected differentially by the experimental conditions. Western blot analysis clearly evidenced an increase of approximately 120–180% in the amount of PAG in NMDA- and KCl-treated cells, whereas GLDH was not significantly modified. These results demonstrate that the NMDA- and KCl-induced activation of PAG are not due to the modification of the preexisting enzyme, but to an increase in the synthesis of this enzyme. This suggests that NMDA receptor stimulation during critical periods of the cerebellar granule cell development leads to the activation of gene expression involved in the process of cell differentiation. © 1996 Wiley-Liss, Inc." @default.
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- W2022987531 date "1996-09-01" @default.
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- W2022987531 title "Characterization of the activation of glutaminase induced by N-methyl-D-aspartate and potassium in cerebellar granule cells" @default.
- W2022987531 doi "https://doi.org/10.1002/(sici)1097-4547(19960901)45:5<637::aid-jnr13>3.0.co;2-w" @default.
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