Abstract
The possibility of rhythmicity in the intestinal absorption of lipids was explored by assessing the absorption of vitamin K-1 by the unanesthetized rat at 6pm, 12 and 6am, and 12pm. A marked variability in the absorption rate of vitamin K-1 was found throughout the 18-hr period. The highest rates of absorption occurred at midnight (139.8±.22 and 134.4±9.1 pmol/min/10 cm of jejunum and ileum, respectively). The lowest rates of absorption occurred at 6am (54.5±1 and 81.4±7.4 pmol/min/10 cm of jejunum and ilenum, respectively). Absorption rates at noon were not different from absorption at 6am but an initial increase in absorption was noted at 6pm. Synchronization of the absorptive rate with time is most likely related to the time of feeding and not to changes in the pattern of illumination. The possibility of marked diurnal variability in the absorption rate should be considered in the design and execution of intestinal absorption experiments.
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Hollander, D., Kielb, M. & Rim, E. Diurnal rhythmicity of absorption of a lipid compound (vitamin K-1)in vivo in the rat. Digest Dis Sci 23, 1125–1128 (1978). https://doi.org/10.1007/BF01072889
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DOI: https://doi.org/10.1007/BF01072889