4.5 Article

L-Ornithine intake affects sympathetic nerve outflows and reduces body weight and food intake in rats

Journal

BRAIN RESEARCH BULLETIN
Volume 111, Issue -, Pages 48-52

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.brainresbull.2014.11.004

Keywords

Autonomic nervous system; Appetite; Adipose tissue; Hypothalamus; Electrophysiology; Afferent vagal nerve

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Funding

  1. Kyowa Hakko Bio., Ltd, Japan
  2. Grants-in-Aid for Scientific Research [26870672] Funding Source: KAKEN

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Ingesting the amino acid L-ornithine effectively improves lipid metabolism in humans, although it is unknown whether it affects the activities of autonomic nerves that supply the peripheral organs related to lipid metabolism, such as adipose tissues. Thus, we investigated the effects of L-ornithine ingestion on autonomic nerves that innervate adipose tissues and the feeding behaviors of rats. Intragastric injection of L-ornithine (2.5%) in urethane-anesthetized rats activated sympathetic nerve activity to white adipose tissue (WAT-SNA), and stimulated sympathetic nerve activity to brown adipose tissue (BAT-SNA). In addition, WAT-SNA responses to L-ornithine were abolished in rats with ablated abdominal vagal nerves. L-ornithine ingestion for 9 weeks also significantly reduced rats' body weight, food intake, and abdominal fat weight. Proopiomelanocortin (POMC) levels in the hypothalamus and uncoupling protein 1 (UCP1) levels in brown adipose tissue were significantly increased in rats that ingested 2.5% L-ornithine for 9 weeks. These results suggested that ingested L-ornithine was taken up in the gastrointestinal organs and stimulated afferent vagal nerves and activated the central nervous system. Subsequently, increased hypothalamic POMC activated sympathetic neurotransmission to adipose tissues and accelerated energy expenditure. (C) 2014 Elsevier Inc. All rights reserved.

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