title: Lipids in total parenteral nutrition solutions differentially modify lipids in piglet intestinal brush border and microsomal membranes.
abstract: BACKGROUND
  Fats in the diet modify the lipid composition and function of the intestinal brush border membrane (BBM) as well as the enterocyte microsomal membrane (EMM).
  
  
  METHODS
  This study was undertaken in pigs to establish the effect of 3 weeks of total parenteral nutrition (TPN) on the fatty acids in the major phospholipids, (phosphatidylcholine [PC] and phosphatidylethenolamine [PE] in the jejunal and ileal BBM and EMM.
  
  
  RESULTS
  In a comparison of 21-day-old milk-fed piglets and newborn animals, there were differences in the major fatty acids (palmitic, 16:0; stearic, 18:0; oleic, 18:1 omega 9, and linoleic acid, 18:2 omega 6) in PC and PE in BBM and EMM. Age-matched (3-week-old) animals fed a lipid-free glucose-containing TPN solution had different membrane fatty acids than did milk-fed piglets, or animals given a soybean oil-containing TPN solution for 21 days. Substituting fish oil or fish oil plus soybean oil altered BBM and EMM fatty acids, compared with the soybean oil-based TPN solutions. These changes varied between the class of phospholipids (PC vs PE), between intestinal site (jejunum vs ileum), and between the type of membrane (BBM vs EMM).
  
  
  CONCLUSIONS
  The jejunum and ileum have distinctive control mechanisms for varying their membrane lipids in response to TPN. There is some postmicrosomal modification of lipids between the EMM and BBM. It remains to be established whether the lipid content of the membranes of other organs, and therefore their function, is modified by the lipid composition of parenterally infused lipids.
authors.affiliation: Nutrition and Metabolism Research Group, University of Alberta, Edmonton, Canada.
authors.forename: J E
authors.initials: JE
authors.lastname: van Aerde
authors.forename: M
authors.initials: M
authors.lastname: Keelan
authors.forename: M T
authors.initials: MT
authors.lastname: Clandinin
authors.forename: A B
authors.initials: AB
authors.lastname: Thomson
mesh_terms: D000375:Aging / Q000378:metabolism; D000818:Animals; D000831:Animals, Newborn; D005217:Fat Emulsions, Intravenous / Q000494:pharmacology*; D005227:Fatty Acids / Q000032:analysis / Q000378:metabolism; D007082:Ileum / Q000737:chemistry* / Q000166:cytology / Q000648:ultrastructure; D007425:Intracellular Membranes / Q000737:chemistry / Q000378:metabolism / Q000648:ultrastructure; D007583:Jejunum / Q000737:chemistry* / Q000166:cytology / Q000648:ultrastructure; D050356:Lipid Metabolism; D008055:Lipids / Q000008:administration & dosage / Q000032:analysis; D008861:Microsomes / Q000737:chemistry* / Q000378:metabolism / Q000648:ultrastructure; D008871:Microvilli / Q000737:chemistry / Q000378:metabolism / Q000648:ultrastructure; D010289:Parenteral Nutrition, Total / Q000592:standards*; D010713:Phosphatidylcholines / Q000032:analysis / Q000378:metabolism; D010714:Phosphatidylethanolamines / Q000032:analysis / Q000378:metabolism; D013552:Swine
chemical_list: D005217:Fat Emulsions, Intravenous; D005227:Fatty Acids; D008055:Lipids; D010713:Phosphatidylcholines; D010714:Phosphatidylethanolamines