Duodenal infusion of fatty acids differentially affects plasma glucagon-like peptide-1 and ghrelin concentrations in sheep. (14th March 2018)

• Record Type: Journal Article
• Authors: Fukumori, Rika; Masuda, Yoji; Takeuchi, Ayaka; Yanai, Rina; Atchalalt, Khurchabiling; Sarentonglaga, Borjigin; Ogata, Kazuko; Yamaguchi, Mio; Hara, Asuka; Sato, Akane; Sugino, Toshihisa; Nagao, Yoshikazu
• Is Part Of: Journal of animal science. Volume 96:Number 5(2018)
• Page Start: 1889
• Page End: 1893
• Publication Date: 2018-03-14
• Subjects: ghrelin -- GLP-1 -- long-chain fatty acids -- medium-chain fatty acids -- ruminants; Livestock -- Periodicals; Livestock; Electronic journals; Periodicals; 636.005
• DOI: 10.1093/jas/sky083
• Languages: English
• ISSNs: 0021-8812

Abstract

Abstract: The aim of this study was to investigate how intraduodenal infusions of fatty acids (FA ) affect appetite-related gut peptides such as glucagon-like peptide-1 (GLP-1 ) and ghrelin in sheep. We hypothesized that these peptides can be highly reactive to unsaturated long-chain FA, because they are well known to decrease dry matter intake (DMI ). Four ewes were fitted with a duodenal cannula and a jugular vein catheter for a 6-h duodenal infusion of the 9 FA (C8:0, C10:0, C12:0, C14:0, C16:0, C18:0, C18:1, C18:2, and C18:3) and water (control). The concentration of each FA was 1.6 g per metabolic body weight (BW ), approximately corresponding to the amount of supplemented fat in a standard dairy cow diet. Each infusion was separated by at least 2 d. During the infusion period, blood samples were collected periodically to determine changes in plasma GLP-1, ghrelin, and metabolite concentrations. Duodenal infusions of C18:1, C18:2, and C18:3 led to higher plasma GLP-1 ( P < 0.05) and lower glucose ( P < 0.05) than control. Plasma ghrelin concentrations were greater in C18:1 and C18:3 infusions than control ( P < 0.05). Plasma ketone bodies were higher in C8:0 and C10:0 infusions ( P < 0.05), but plasma triglyceride concentrations were lower in C8:0, C10:0, C12:0, and C16:0 infusions ( P < 0.05) than control. Fatty acid infusions except for C18:3 led to higher plasma NEFA concentrations than control ( P < 0.05). These results confirmed that the hypophagic effect of dietary unsaturated long-chain FA is mediated by GLP-1 (an anorexigenic effect) secretion. However, we also observed higher plasma ghrelin (an orexigenic effect) partially by unsaturated long-chain FA. Thus, the gut peptide secretions when ruminant animals ingest FA supplements would complexly affect satiety and further studies are needed to determine their each impact on DMI.