Ghrelin activation and neuropeptide Y elevation in response to medium chain triglyceride administration in anorexia nervosa patients

Keisuke Kawai, Megumi Nakashima, Masayasu Kojima, Sakino Yamashita, Shu Takakura, Miki Shimizu, Chiharu Kubo, Nobuyuki Sudo

Research output: Contribution to journalArticle

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Abstract

Background & aims Ghrelin, a peptide found in the stomach, increases appetite and fat-free mass while suppressing energy expenditure. Ghrelin requires modification by medium-chain triglycerides (MCTs) to exert its physiological effects. In this study, we investigated ghrelin activation and the resulting physiological changes following MCT administration. Methods Thirty participants were selected from among inpatients diagnosed with anorexia nervosa (AN). The patients were randomly divided into three groups by the MCT content of their nutritional supplement: (1) ‘MCT high’ (>6 g/day), (2) ‘MCT moderate’ (1–6 g/day), and (3) ‘MCT low’ (<1 g/day). Physical factors such as body weight and composition, as well as levels of nutrition-related serum factors such as acylated (active form) and desacyl (inactive form) ghrelin, leptin, growth hormone, insulin-like growth factor, and neuropeptide Y (NPY) were measured at weeks 0, 2, 4, and 6 of the treatment protocol. Results Significantly higher ghrelin activation was found in the ‘MCT high’ than in the ‘MCT low’ group (P < 0.05). The amount of consumed MCT had a curvilinear relationship with the active ghrelin level (P = 0.00). NPY levels in the ‘MCT high’ group were significantly more elevated than in the ‘MCT low’ group (P < 0.05). MCT administration did not significantly affect the remaining factors. Conclusions This study clearly demonstrated that MCT activates ghrelin and increases NPY, suggesting that nutritional supplementation with MCT may be effective for the treatment of AN patients in an emaciated state.

Original languageEnglish
Pages (from-to)100-104
Number of pages5
JournalClinical Nutrition ESPEN
Volume17
DOIs
Publication statusPublished - Feb 1 2017

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Ghrelin
Neuropeptide Y
Anorexia Nervosa
Triglycerides
Somatomedins
Appetite
Clinical Protocols
Leptin
Body Composition
Energy Metabolism
Growth Hormone
Inpatients

All Science Journal Classification (ASJC) codes

  • Endocrinology, Diabetes and Metabolism
  • Nutrition and Dietetics

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Ghrelin activation and neuropeptide Y elevation in response to medium chain triglyceride administration in anorexia nervosa patients. / Kawai, Keisuke; Nakashima, Megumi; Kojima, Masayasu; Yamashita, Sakino; Takakura, Shu; Shimizu, Miki; Kubo, Chiharu; Sudo, Nobuyuki.

In: Clinical Nutrition ESPEN, Vol. 17, 01.02.2017, p. 100-104.

Research output: Contribution to journalArticle

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abstract = "Background & aims Ghrelin, a peptide found in the stomach, increases appetite and fat-free mass while suppressing energy expenditure. Ghrelin requires modification by medium-chain triglycerides (MCTs) to exert its physiological effects. In this study, we investigated ghrelin activation and the resulting physiological changes following MCT administration. Methods Thirty participants were selected from among inpatients diagnosed with anorexia nervosa (AN). The patients were randomly divided into three groups by the MCT content of their nutritional supplement: (1) ‘MCT high’ (>6 g/day), (2) ‘MCT moderate’ (1–6 g/day), and (3) ‘MCT low’ (<1 g/day). Physical factors such as body weight and composition, as well as levels of nutrition-related serum factors such as acylated (active form) and desacyl (inactive form) ghrelin, leptin, growth hormone, insulin-like growth factor, and neuropeptide Y (NPY) were measured at weeks 0, 2, 4, and 6 of the treatment protocol. Results Significantly higher ghrelin activation was found in the ‘MCT high’ than in the ‘MCT low’ group (P < 0.05). The amount of consumed MCT had a curvilinear relationship with the active ghrelin level (P = 0.00). NPY levels in the ‘MCT high’ group were significantly more elevated than in the ‘MCT low’ group (P < 0.05). MCT administration did not significantly affect the remaining factors. Conclusions This study clearly demonstrated that MCT activates ghrelin and increases NPY, suggesting that nutritional supplementation with MCT may be effective for the treatment of AN patients in an emaciated state.",
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AB - Background & aims Ghrelin, a peptide found in the stomach, increases appetite and fat-free mass while suppressing energy expenditure. Ghrelin requires modification by medium-chain triglycerides (MCTs) to exert its physiological effects. In this study, we investigated ghrelin activation and the resulting physiological changes following MCT administration. Methods Thirty participants were selected from among inpatients diagnosed with anorexia nervosa (AN). The patients were randomly divided into three groups by the MCT content of their nutritional supplement: (1) ‘MCT high’ (>6 g/day), (2) ‘MCT moderate’ (1–6 g/day), and (3) ‘MCT low’ (<1 g/day). Physical factors such as body weight and composition, as well as levels of nutrition-related serum factors such as acylated (active form) and desacyl (inactive form) ghrelin, leptin, growth hormone, insulin-like growth factor, and neuropeptide Y (NPY) were measured at weeks 0, 2, 4, and 6 of the treatment protocol. Results Significantly higher ghrelin activation was found in the ‘MCT high’ than in the ‘MCT low’ group (P < 0.05). The amount of consumed MCT had a curvilinear relationship with the active ghrelin level (P = 0.00). NPY levels in the ‘MCT high’ group were significantly more elevated than in the ‘MCT low’ group (P < 0.05). MCT administration did not significantly affect the remaining factors. Conclusions This study clearly demonstrated that MCT activates ghrelin and increases NPY, suggesting that nutritional supplementation with MCT may be effective for the treatment of AN patients in an emaciated state.

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