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Methionine sulfoximine prevents the accumulation of large neutral amino acids in brain of hyperammonemic rats

Authors
Journal
Journal of Surgical Research
0022-4804
Publisher
Elsevier
Publication Date
Volume
36
Issue
4
Identifiers
DOI: 10.1016/0022-4804(84)90110-0

Abstract

Abstract Accumulation of neutral amino acids in the brain due to altered transport across the blood-brain barrier appears to be a consequence of portal-systemic shunting and hyperammonemia. It has been suggested that high brain concentrations of glutamine, a product of cerebral ammonia detoxification, accelerates the transport of other neutral amino acids from blood to brain. To test this hypothesis, normal rats were infused with ammonium salts with or without pretreatment with l-methionine- dl-sulfoximine (MSO), an inhibitor of glutamine synthesis. Pretreatment with MSO prevented most ammonium salt-induced changes in the concentrations of the neutral amino acids in brain, suggesting that hyperammonemia alters the transport of neutral amino acids across the blood-brain barrier by causing the brain glutamine level to rise.

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