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Regional variability in circadian rhythmicity of intestinal digestive-absorptive functions.
Metadata
JournalInt J ChronobiolNot FoundDate
1979
Type
Research Support, U.S. Gov't, P.H.S.
Journal Article
Volume
1979 / 6 : 119-34
Author
Stevenson NR , Sitren HS
Doi
Not Found
PMIDMESH
Alkaline Phosphatase
Animals
Circadian Rhythm
Digestion
Glycoside Hydrolases
Intestinal Absorption
Intestine, Small
Kinetics
Leucyl Aminopeptidase
Male
Methylglucosides
Rats
gamma-Glutamyltransferase
Abstract
The circadian rhythms of sucrase, maltase, isomaltase, trehalase, lactase, gamma-glutamyltransferase, leucylnaphthylamide hydrolyzing activity, alkaline phosphatase and monosaccharide transport were assessed in each fifth of the small intestine of the rat in order to determine if an entire enzyme or transport system population responded in a similar manner or if there were regional differences. Animals were maintained under a light-dark cycle and fed from 1400-1800, EST for 7 days. Functional activities were assessed every 4 h for 24 h, inclusively. Quantitative, and in a few instances, qualitative differences in different areas of the intestine were found for all functions. There were portions of the lactase and alkaline phosphatase populations which displayed no rhythmicity in activity. When rhythmicity was observed there were differences in the activity patterns along the intestine for all functions. Thus, the rhythm patterns obtained from homogenates of the entire small intestine are a composite of the patterns in regions of high average activity. Also, there appears to be a reasonable amount of local control of the various functions.
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Int J ChronobiolInternational journal of chronobiology
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