Abstract：
:The relationship between acidosis and the metabolism of glutamine and glutamate was studied in cultured astrocytes. Acidification of the incubation medium was associated with an increased formation of aspartate from glutamate and glutamine. The rise of the intracellular content of aspartate was accompanied by a significant decline in the extracellular concentration of both lactate and citrate. Studies with either [2-(15)N]glutamine or [15N]glutamate indicated that there occurred in acidosis an increased transamination of glutamate to aspartate. Studies with L-[2,3,3,4,4-(2)H5]glutamine indicated that in acidosis glutamate carbon was more rapidly converted to aspartate via the tricarboxylic acid cycle. Acidosis appears to result in increased availability of oxaloacetate to the aspartate aminotransferase reaction and, consequently, increased transamination of glutamate. The expansion of the available pool of oxaloacetate probably reflects a combination of: (a) Restricted flux through glycolysis and less production from pyruvate of acetyl-CoA, which condenses with oxaloacetate in the citrate synthetase reaction; and (b) Increased oxidation of glutamate and glutamine through a portion of the tricarboxylic acid cycle and enhanced production of oxaloacetate from glutamate and glutamine carbon. The data point to the interplay of the metabolism of glucose and that of glutamate in these cells.
journal_name
Neurochem Intjournal_title
Neurochemistry internationalauthors
Yudkoff M,Daikhin Y,Nissim I,Nissim Idoi
10.1016/s0197-0186(99)00141-2subject
Has Abstractpub_date
2000-04-01 00:00:00pages
329-39issue
4-5eissn
0197-0186issn
1872-9754pii
S0197-0186(99)00141-2journal_volume
36pub_type
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journal_title：Neurochemistry international
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