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Journal of Lipid Research, Vol. 7, 158-166, January 1966
Copyright © 1966 by Lipid Research, Inc.

Origin and characteristics of endogenous lipid in thoracic duct lymph in rat

James H. Baxter

Laboratory of Metabolism, National Heart Institute, National Institutes of Health, Bethesda, Maryland

Thoracic duct lymph of rats eating a fat-free diet contained 7 mg of lipid per hr. The lipid was 70% triglyceride, and largely in the d < 1.006 lipoprotein fraction. Lipid of the d < 1.006 fraction of the lymph was many times more concentrated than that of the blood plasma at the same time. It reached the thoracic duct via lymphatics from the intestine; little entered from the liver. The fatty acid moiety composing over three-fourths of the lymph lipid mass was undoubtedly derived in part from bile lipid—possibly to the extent of roughly 50%, and in some part from other intraluminal materials. Studies with labeled palmitic acid indicated that little circulating free fatty acid was taken up by the intestinal mucosa and incorporated into lymph lipid.

Supplementary key words thoracic duct lymph • endogenous lipid • composition • source of fatty acid • intestine • liver • bile • blood • rat • eicosa-13-enoic acid

Submitted on March 22, 1965
Accepted on August 13, 1965

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