Title: Daily Variation in Liver Tryptophan, Tryptophan Pyrrolase, and Tyrosine Transaminase in Rats Fed ad Libitum or Single Daily Meals
Abstract: Tryptophan pyrrolase activity in the liver of rats fed a single daily meal was generally higher than in rats fed ad libitum, and the daily rhythm in the enzyme was shifted in meal-fed rats compared to rats fed ad libitum. Tryptophan in liver was lower in rats fed a single meal, but the daily rhythm in the amino acid was similar to that in rats fed ad libitum. The daily rhythms in tryptophan pyrrolase, tryptophan, and tryosine transaminase in liver and of corticosterone in plasma were similar in rats fed ad libitum, all four constituents reaching maximum between 8 and 11 PM. In rats fed a single daytime meal, the enzyme rhythms were dissociated from the tryptophan rhythm and from the plasma corticosterone rhythm. It is unlikely that the tryptophan rhythm or the plasma corticosterone rhythm generates the enzyme rhythms.
Publication Year: 1970
Publication Date: 1970-02-01
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
Access and Citation
Cited By Count: 28
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