Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 427, Issue 2, Pages 299-304Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2012.09.045
Keywords
Ternatin; Cyclic peptide; Anti-diabetic; Blood glucose; Triglyceride; KK-A(y) mice
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Funding
- Adaptable and Seamless Technology transfer Program through target-driven R&D (A-STEP) from Japan Science and Technology Agency [AS231Z03808E]
- Towa foundation for food research
- Grants-in-Aid for Scientific Research [21380079, 21221009] Funding Source: KAKEN
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(-)-Ternatin is a highly methylated cyclic heptapeptide isolated from mushroom Coriolus versicolor. Ternatin has an inhibitory effect on fat accumulation in 3T3-L1 adipocytes. [D-Leu(7)]ternatin, a ternatin derivative, also inhibited fat accumulation in 3T3-L1 cells, although the effectiveness of [D-Leu(7)]ternatin was lower than that of ternatin. In this study, we investigated the effects of ternatin and [D-Leu(7)]ternatin on obesity and type 2 diabetes in KK-A(y) mice, an animal model for spontaneously developed type 2 diabetes. We continuously administered ternatin (8.5 or 17 nmol/day) or [D-Leu(7)]ternatin (68 nmol/day) to mice via a subcutaneous osmotic pump. Unexpectedly, neither ternatin nor [D-Leu(7)]ternatin affected body weight or adipose tissue weight in KK-A(y) mice. In contrast, it was demonstrated that both ternatin and [D-Leu(7)]ternatin suppress the development of hyperglycemia. In liver, the SREBP-1c mRNA level tended to be lower or significantly decreased in mice treated with ternatin or [D-Leu(7)]ternatin, respectively. Moreover, we found that ternatin directly lowered the SREBP-lc mRNA level in Hepa1-6 hepatocyte cells. This study showed that ternatin and [D-Leu(7)]ternatin each had a preventive effect on hyperglycemia and a suppressive effect on fatty acid synthesis in KK-A(y) mice. (C) 2012 Elsevier Inc. All rights reserved.
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