Reduction of glutamine synthetase specific activity in cultured astroglia by ferrous chloride.

Abstract:

:Immature and mature rat astroglia in culture were assayed for glutamine synthetase (GS) activity after a single exposure to the epileptogen FeCl2. Cells were cultured with both standard and elevated extracellular potassium or glutamate (Glu) concentrations. FeCl2 reduced GS activity below control levels, whereas high Glu increased GS activity. However, stimulation by high Glu was significantly attenuated in cultures given both FeCl2 and high Glu, indicating that cells treated with FeCl2 were not able to respond as effectively to increased extracellular glutamate by increasing their GS activity. The significance of these findings is that glial regulation of the neuronal environment may be impaired, based on the proposed importance of GS in ammonia detoxification in the brain.

journal_name

J Neurosci Res

authors

Tiffany-Castiglioni E,Roberts JA,Sheeler-Gough LV

doi

10.1002/jnr.490240408

subject

Has Abstract

pub_date

1989-12-01 00:00:00

pages

508-16

issue

4

eissn

0360-4012

issn

1097-4547

journal_volume

24

pub_type

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