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Fine Structural Localization of Cholesterol during Fat Absorption by Bovine Intestinal Mucosa¹

Department of Animal Science and Department of Biochemistry and Biophysics Iowa State University, Ames 50010

ABSTRACT

Digitonin was incorporated into tissue fixation to localize free cholesterol during fat absorption by the bovine small intestine. Reaction products were associated with lipid droplets in the apical part of epithelial cells and, to a limited extent, with lipid-containing regions of the Golgi apparatus and intercellular spaces. These observations suggest that cholesterol is associated with lipid droplets early in the transport phase and that such an association may be the result of the process of chylomicron formation.

¹ Journal Paper J-6875 of the Iowa Agriculture and Home Ecollomics Experiment Station, Ames, Iowa. Project 1324. Supported in part by funds provided by Grant HE-04969, Department of Health, Education and Welfare.

² Present address: The Hormel Institute, Austin, Minnesota 55912.

³ Present address: Department of Biochemistry, Louisiana State University, Baton Rouge 70803.