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Ontogenetic development of glutamate metabolizing enzymes in cultured cerebellar granule cells and in cerebellumin vivo

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Abstract

The ontogenetic development of the enzymes phosphate activated glutaminase (PAG), glutamate dehydrogenase (GLDH), glutamic-oxaloacetic-transaminase (GOT), glutamine synthetase (GS), and ornithine-δ-aminotransferase (Orn-T) was followed in cerebellum in vivo and in cultured cerebellar granule cells. It was found that PAG, GLDH, and GOT exhibited similar developmental patterns in the cultured neurons compared to cerebellum. PAG showed, however, a more pronounced phosphate activation in the cultured granule cells compared to in vivo. The activity of GS remained low in the cultured neurons compared to the increasing activity of this enzyme found in vivo. On the other hand Orn-T exhibited an increase in its specific activity in the cultured cells as a function of time in culture in contrast to the non-changing activity of this enzyme in vivo. Compared to cerebellum the cultured neurons exhibited higher activities of GLDH, GOT, and Orn-T whereas the activity of PAG was only slightly higher in the cultured cells. The activity of GS in the cultured neurons was only 5–10% of the activity in cerebellum in vivo. It is concluded that cultured cerebellar granule cells represent a reliable model system by which the metabolism and function of glutamatergic neurons can be conveniently studied in a physiologically meaningful way.

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Authors and Affiliations

  1. Department of Biochemistry A Panum Institute, University of Copenhagen, 3 Blegdamsvej, DK-2200, Copenhagen, Denmark

    J. Drejer & A. Schousboe

  2. Department of Nuclear Medicine, State University Hospital, DK-2100, Copenhagen, Denmark

    O. M. Larsson

  3. Neurochemical Laboratory, University of Oslo Preclinical Medicine Blindern, Oslo 3, Norway

    E. Kvamme & G. Svenneby

  4. Department of Pharmacology, University of Saskatchewan Saskatoon, S7N OWO, Saskatoon, Canada

    L. Hertz

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Drejer, J., Larsson, O.M., Kvamme, E. et al. Ontogenetic development of glutamate metabolizing enzymes in cultured cerebellar granule cells and in cerebellumin vivo . Neurochem Res 10, 49–62 (1985). https://doi.org/10.1007/BF00964771

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