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An autoradiographic study of the intestinal absorption of palmitic and oleic acid.

Haglund, U., M. Jodal and O. Lundgren. An autoradiographic study of the intestinal absorption of palmitic and oleic acid. Acta physiol. scand. 1973. 89. 306–317. 
 
 
 
The distribution of intraluminally incubated long chain fatty acids (LFA; ;3H-palmitic acid, :3H-oleic acid) within the intestinal villi were studied during in vivo conditions with an autoradiographic technique which prevented tracer losses from the tissue. The results show that LFA are fairly diffusely localized throughout the whole epithelial cell and, to some extent, also in the lamina propria after 1 or 20 min incubation. Intense vasodilatation or a 7% albumin solution administered intraluminally after the tracer incubation is able to “extract” a large amount of the absorbed LFA from the epithelial cells. These observations strongly suggest that LFA enter the epithelial cells faster than they are reesterified into triglycerides, resulting in a pool of diffusible LFA within the cells. Although the cells are in close contact with the subepithelial capillary network, any subsequent rapid absorption via the blood stream does not occur. It is proposed that the hindrance to net blood absorption of the lipid soluble LFA is a “short circuiting” of the easily diffusible LFA in the mucosal countercurrent exchanger.