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Abstract Title:

Butyrate reduces appetite and activates brown adipose tissue via the gut-brain neural circuit.

Abstract Source:

Gut. 2017 Nov 3. Epub 2017 Nov 3. PMID: 29101261

Abstract Author(s):

Zhuang Li, Chun-Xia Yi, Saeed Katiraei, Sander Kooijman, Enchen Zhou, Chih Kit Chung, Yuanqing Gao, José K van den Heuvel, Onno C Meijer, Jimmy F P Berbée, Marieke Heijink, Martin Giera, Ko Willems van Dijk, Albert K Groen, Patrick C N Rensen, Yanan Wang

Article Affiliation:

Zhuang Li

Abstract:

OBJECTIVE: Butyrate exerts metabolic benefits in mice and humans, the underlying mechanisms being still unclear. We aimed to investigate the effect of butyrate on appetite and energy expenditure, and to what extent these two components contribute to the beneficial metabolic effects of butyrate.

DESIGN: Acute effects of butyrate on appetite and its method of action were investigated in mice following an intragastric gavage or intravenous injection of butyrate. To study the contribution of satiety to the metabolic benefits of butyrate, mice were fed a high-fat diet with butyrate, and an additional pair-fed group was included. Mechanistic involvement of the gut-brain neural circuit was investigated in vagotomised mice.

RESULTS: Acute oral, but not intravenous, butyrate administration decreased food intake, suppressed the activity of orexigenic neurons that express neuropeptide Y in the hypothalamus, and decreased neuronal activity within the nucleus tractus solitarius and dorsal vagal complex in the brainstem. Chronic butyrate supplementation prevented diet-induced obesity, hyperinsulinaemia, hypertriglyceridaemia and hepatic steatosis, largely attributed to a reduction in food intake. Butyrate also modestly promoted fat oxidation and activated brown adipose tissue (BAT), evident from increased utilisation of plasma triglyceride-derived fatty acids. This effect was not due to the reduced food intake, but explained by an increased sympathetic outflow to BAT. Subdiaphragmatic vagotomy abolished the effects of butyrate on food intake as well as the stimulation of metabolic activity in BAT.

CONCLUSION: Butyrate acts on the gut-brain neural circuit to improve energy metabolism via reducing energy intake and enhancing fat oxidation by activating BAT.

Study Type : Animal Study

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Sayer Ji
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