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Am J Physiol Gastrointest Liver Physiol 238: G203-G207, 1980;
0193-1857/80 $5.00
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AJP - Gastrointestinal and Liver Physiology, Vol 238, Issue 3 203-G207, Copyright © 1980 by American Physiological Society

ARTICLES

Circadian rhythmicity in several small intestinal functions is independent of use of the intestine

N. R. Stevenson, H. S. Sitren and S. Furuya

Fifty milliliters of a liquid diet were administered daily to rats in three different ways: 1) orally, beginning at 0000 h; 2) by continuous intravenous infusion; and 3) by discontinuous intravenous infusion from 0000 to 1400 h. Animals were killed every 6 h over a 24-h period. Activity profiles as a function of time of day were determined for the following small intestinal parameters; monosaccharide transport; five disaccharidases; alkaline phosphatase; gamma-glutamyltransferase; leucylnaphthylamide hydrolyzing activity; villus height and width; and number of columnar cells lining a villus section. Circadian rhythmicity as previously reported was observed for all parameters in rats fed orally for 7 days but was not observed in any parameters in rats fed by continuous infusion for 9 days. Rats fed by discontinuous infusion for 10 days maintained circadian rhythmicity in the following functions: monosaccharide transport; disaccharidase activities; and columnar cell number. Thus, rhythmicity in these functions can exist without nutrient delivery to the alimentary tract and presumably arises from involvement of a neuro-endocrine component. The other activities tested appear to require the alimentary tract for the existence of circadian rhythmicity.


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