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Insulin-Like Growth Factor 1 Has Beneficial Effects, Whereas Growth Hormone Has Limited Effects on Postoperative Protein Metabolism, Gut Integrity, and Splenic Weight in Rats With Chronic Mild Liver Injury

Department of Surgery I, University of Tokyo, Japan

Hideaki Saito, MD

Surgical Center, University of Tokyo, Japan

Ryoji Fukushima, MD

Department of Surgery I, University of Tokyo, Japan

Yojiro Hashiguchi, MD

Department of Surgery I, University of Tokyo, Japan

Miing-Tsan Lin, MD

Department of Surgery I, University of Tokyo, Japan

Tomomi Inoue, MD

Department of Surgery I, University of Tokyo, Japan

Kazuhiko Fukatsu, MD

Department of Surgery I, University of Tokyo, Japan

Tetsuichiro Muto, MD

Department of Surgery I, University of Tokyo, Japan

Teruaki Oka, MD

Department of Pathology, Faculty of Medicine, University of Tokyo, Japan

Asako Takenaka, PHD

Laboratory of Nutritional Chemistry, Department of Agricultural Chemistry, Faculty of Agriculture, University of Tokyo, Japan

Shin-Ichiro Takahashi, PHD

Laboratory of Nutritional Chemistry, Department of Agricultural Chemistry, Faculty of Agriculture, University of Tokyo, Japan

Tadashi Noguchi, PHD

Laboratory of Nutritional Chemistry, Department of Agricultural Chemistry, Faculty of Agriculture, University of Tokyo, Japan

Background: Both growth hormone (GH) and insulin-like growth factor 1 (IGF-1) improve protein metabolism after surgical insult in subjects without liver disease. However, these effects in chronic liver injury, in which the GH-IGF-1 axis is impaired, have not been investigated. We examined the anabolic effects of GH and IGF-1 after gastrectomy in rats with chronic mild liver injury. Methods: Rats with chronic mild liver injury induced by thioacetamide were used. After gastrectomy, the rats were randomized into vehicle control, GH, and IGF-1 groups. In the latter two groups, 0.8 IU/kg/d of GH or 4 mg/kg/d of IGF-1 was infused for 72 hours. Anabolic effects were assessed by body weight change, 3-methylhistidine (3-MH) excretion, nitrogen excretion, and whole-body protein turnover. Organ weights, plasma levels of glucose, insulin, and IGF-1, tissue IGF-1 levels, hepatic messenger RNA (mRNA) content, and intestinal structure were also determined. Results: Both GH and IGF-1 decreased nitrogen excretion. IGF-1, but not GH, increased postoperative body weight, whole-body protein turnover, and splenic weight. IGF-1 reduced atrophy of the intestinal mucosa. GH treatment increased hepatic IGF-1-mRNA and the plasma IGF-1 level, whereas IGF-1 treatment increased the plasma IGF-1 level with no change in the hepatic IGF-1-mRNA content. There were no significant differences in plasma glucose or insulin levels among the three groups. Neither GH nor IGF-1 affected the gastrocnemius muscle IGF-1 level. Conclusions: IGF-1 has beneficial effects, whereas GH has only limited effects on postoperative protein metabolism, gut integrity, and splenic weight in chronic mild liver injury. (Journal of Parenteral and Enteral Nutrition 21:55-62, 1997)

Journal of Parenteral and Enteral Nutrition, Vol. 21, No. 2, 55-62 (1997)
DOI: 10.1177/014860719702100255


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