The behavior of rat bile phospholipids in the intestine and in incubation media containing pancreatic juice |
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Authors: | P Boucrot D Reisser J Clement |
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Affiliation: | (1) Laboratoire de Physiologie animale et de la Nutrition, UER NUTRITION, 6, boulevard Gabriel, 21000 DIJON, (France) |
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Abstract: | Samples of radioactive bile were collected from rats after intravenous injection of potassium soaps (9–103H2] or 114C] oleate, 114C] linoleate or 9–103H2] palmitate). These radioactive acids were chosen because it is well established that, in natural phosphatidyl cholines, palmitic
acid is located chiefly at the 1 position and linoleic and oleic acids at the 2 position. After incubation of bile with pancreatic
juice, the labeling of unchanged biliary phospholipids was higher when native bile was labeled with oleic acid than with palmitic
or linoleic acids. These data suggest that monounsaturated molecular species of biliary phospholipids are more resistant than
the diunsaturated ones to in vitro hydrolysis by phospholipase A2. Ninety min after introduction of the radioactive bile into the upper part of the rat duodenum, high labeling of luminal
phospholipids was observed regardless of the bile sample used, although labeling of free fatty acids was always low. The passage
of intact biliary phospholipids through the intestinal epithelium is discussed. |
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