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Changes in brain levels of acidic, basic, and neutral amino acids after consumption of single meals containing various proportions of protein.

Abstract：

:Rats fasted overnight were allowed to consume single meals containing 0, 18, or 40% protein or continued to fast; after 2 h, brains and sera were taken and assayed for various amino acids. In general, serum levels of most amino acids were reduced by the 0% protein meal and elevated by the high-protein meal when compared with those associated with fasting conditions. Exceptions were those not diminished by the 0% protein meal (tryptophan, methionine, proline) and those increased (alanine) or decreased (glycine) by all of the test meals. Amino acids exhibiting the broadest normal ranges (estimated by comparing their serum levels after 40% protein with those after 0% protein) were tyrosine, leucine, valine, isoleucine, and proline; serum lysine and histidine, two basic amino acids, also varied more than threefold. Brain levels of lysine, histidine, and some of the large neutral amino acids (LNAAs) also exhibited clear relationships to the protein content of the test meal: those of valine, leucine, and isoleucine were depressed by the 0% protein but increased (compared with 0% protein) when protein was added to the meal: brain tyrosine was increased by all of the test meals in proportion to their protein contents; tryptophan, phenylalanine, and glutamate were increased after the 0% protein meal but not by protein-containing meals; brain lysine, histidine, and methionine were increased after the high-protein meal, and brain alanine was increased slightly by all of the meals.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

J Neurochem

journal_title

Journal of neurochemistry

authors

Glaeser BS,Maher TJ,Wurtman RJ

doi

10.1111/j.1471-4159.1983.tb09045.x

subject

Has Abstract

pub_date

1983-10-01 00:00:00

pages

1016-21

issue

4

eissn

0022-3042

issn

1471-4159

journal_volume

41

pub_type

杂志文章

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