Abstract
SummaryIntravenous injection of vitamin A in the form of rat chyle into vit A-deficient assay rats produced a growth response twice that produced by the same dose given orally. The characteristic vit A auto-fluorescence was absent from the parenchy-mal cells of liver and adrenal cortex of assay rats depleted of vit A; the autofluorescence was restored to the distribution in these tissues characteristic of the normally fed rat only after intravenous injection of rat chyle which contained vit A. In contrast, intravenous injection of artificial emulsions which contained vit A resulted in a marked localization of vit A fluorescence in the reticulo-endo-thelial cells of spleen, lungs and liver and to a smaller extent in the liver and adrenal parenchymal cells. Most of the vit A content of rat plasma has been reported to be in the soluble fraction; however, we found most of the vit A content of post-absorptive rat chyle in the chylomicron fraction.
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