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- W1983652511 abstract "Groups of young adult, male rats were given free access for 12 weeks to a single diet containing either 12%, 24%, or 40% protein (dry weight). At the end of this time, six rats from each diet group were killed every four hours throughout a single 24-hour period, and blood samples and brains were obtained for quantitation of several of the large neutral amino acids (LNAAs). The blood level of each LNAA varied significantly as a function of time of day (tending to be lower during the day than at night) and as a function of dietary protein content (typically rising as protein intake increased). Except for tyrosine and valine, the serum concentration ratio of each LNAA to the sum of the other LNAA (previously reported to be a good predictor of the competitive uptake of each LNAA into brain) and the brain level of each LNAA showed unremarkable variations with time of day and dietary protein content. In contrast, the serum ratios and brain levels of tyrosine and valine did show notable variations at night as a function of dietary protein intake. Together, the results show that within a chronic physiologic range of protein intakes, the serum ratios and brain levels of several large neutral amino acids, particularly tryptophan, bear no relationship to dietary protein level. Though good correlations between these parameters and protein intake were obtained for valine and tyrosine, their physiologic/metabolic significance, if any, is unknown. In general, the data do not support the broad, unvalidated use of serum LNAA ratios in chronic settings as predictors of brain LNAA levels." @default.
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- W1983652511 date "1987-07-01" @default.
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- W1983652511 title "Twenty-four-hour variations in rat blood and brain levels of the aromatic and branched-chain amino acids: Chronic effects of dietary protein content" @default.
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- W1983652511 doi "https://doi.org/10.1016/0026-0495(87)90147-8" @default.
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