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Cellular Localization and Regulation of Glutamine Synthetase in Primary Cultures of Brain Cells from Newborn Mice

Cellular Localization and Regulation of Glutamine Synthetase in Primary Cultures of Brain Cells... Abstract: The cellular distribution of glutamine synthetase was determined by indirect immunofluorescence in cultures of dissociated brain cells from newborn mice. The enzyme could be detected in about 40% of all cells, among which cells with astrocytic morphology were clearly identified. Treatment with the glucocorticoid dexamethasone led to a strong increase in the number of positively stained cells. Enzyme induction by dexamethasone was maximal after 36 h and at a concentration of 0.1 μM. Under these conditions glutamine synthetase specific activity was elevated about sixfold. Steroid hormones other than corticosteroids had no effect. The basal activity in these cultures was near that found in brains of newborn mice, but far below the activity in adult brains, showing that in culture the normal development of these cells is disturbed. A comparison of glial and neuronal cell lines showed that glutamine synthetase is present in both types of cell lines at a very low specific activity. Inducibility of this enzyme by dexamethasone was found in glial but not in neuronal cell lines. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurochemistry Wiley

Cellular Localization and Regulation of Glutamine Synthetase in Primary Cultures of Brain Cells from Newborn Mice

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References (78)

Publisher
Wiley
Copyright
Copyright © 1981 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0022-3042
eISSN
1471-4159
DOI
10.1111/j.1471-4159.1981.tb05289.x
Publisher site
See Article on Publisher Site

Abstract

Abstract: The cellular distribution of glutamine synthetase was determined by indirect immunofluorescence in cultures of dissociated brain cells from newborn mice. The enzyme could be detected in about 40% of all cells, among which cells with astrocytic morphology were clearly identified. Treatment with the glucocorticoid dexamethasone led to a strong increase in the number of positively stained cells. Enzyme induction by dexamethasone was maximal after 36 h and at a concentration of 0.1 μM. Under these conditions glutamine synthetase specific activity was elevated about sixfold. Steroid hormones other than corticosteroids had no effect. The basal activity in these cultures was near that found in brains of newborn mice, but far below the activity in adult brains, showing that in culture the normal development of these cells is disturbed. A comparison of glial and neuronal cell lines showed that glutamine synthetase is present in both types of cell lines at a very low specific activity. Inducibility of this enzyme by dexamethasone was found in glial but not in neuronal cell lines.

Journal

Journal of NeurochemistryWiley

Published: Jul 1, 1981

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