Liver and Skeletal Muscle Lipids Have Differing Fatty Acid Profiles in Short-Gut Rats Fed via Parenteral Nutrition

Abstract

Background: In short-gut rats, we showed marked abnormalities in plasma lipid fatty acids using parenteral nutrition (PN) with lipid vs sham surgery rats. This suggests that either sensing or metabolism of parenteral lipid is abnormal in malabsorption. The goal of this study was to determine fatty acid profiles in skeletal muscle and liver in short-gut rats treated with PN compared with sham rats. Methods: Sprague-Dawley rats underwent laparotomy and massive small bowel resection (or sham surgery). Rats (n = 32, 16 sham, 16 short gut) were randomly assigned to PN with lipid or fat-free PN. After 5 days, weight loss was similar in all groups, and mixed hindlimb skeletal muscle and liver were biopsied. Results: We found marked differences between liver and skeletal muscle. In livers of short-gut animals, 22:4ω6, 22:5ω6, and 22:6ω3 were higher (all p < .05) than in sham. In skeletal muscle, short gut had no effect on fatty acid profiles. In liver, fat-free PN led to significant increases in 20:3ω6, 22:4ω6, 22:5ω6, 20:3ω9, 20:5ω3, 22:6ω3, and triene/tetraene ratio (all p < .05) compared with feeding PN with lipid, irrespective of short gut. In muscle, levels of the distal long-chain fatty acid metabolites and triene/tetraene ratio were minimally affected by nutrition. Serum glucose and insulin concentrations were similar in all 4 groups. Conclusions: Both the presence of short gut and type of PN led to increases in distal metabolites of fatty acids onω :3 and ω:6 pathway in liver phospholipids but not in skeletal muscle during short-term PN feeding in rats.

Short-gut rats fed parenteral nutrition (PN) have elevations in distal products of ω-3 and ω-6 fatty acids in liver phospholipids. Skeletal muscle lipids were unaffected by the presence of a short gut. Feeding fat-free PN also raised long-chain ω-3 and ω-6 fatty acids in liver only.

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