著者
佐藤 隆一郎
出版者
日本脂質栄養学会
雑誌
脂質栄養学 (ISSN:13434594)
巻号頁・発行日
vol.25, no.1, pp.35-42, 2016-03-31 (Released:2016-05-10)
参考文献数
9

Bile acids exert anti-obesity and anti-hyperglycemic effects through a G protein-coupled receptor TGR5. In L cells located in the lower small intestine TGR5 activation stimulates secretion of a peptide hormone GLP-1 that enhances insulin sensitivity. In brown adipose tissues and skeletal muscles its activation results in an increase in energy expenditure, leading to anti-obesity effects. Based on these findings, we searched for food factors that mimic bile acid functions, and identified a citrus limonoid nomilin as a powerful agonist for TGR5. Simulation analyses for TGR5-nomilin association and mutation analyses of human TGR5 revealed that TGR5 is capable of biding nomilin through three amino acid residues located in a transmembrane and extracellular domain. Further analyses using transgenic mice overexpressing human TGR5 in skeletal muscles showed that TGR5 activation results in an increase in muscle mass. Taken together, we believe that TGR5 is one of ideal targets for functional food factors to extend healthy life expectancy.
著者
佐藤 隆一郎
出版者
Japan Society of Nutrition and Food Science
雑誌
日本栄養・食糧学会誌 (ISSN:02873516)
巻号頁・発行日
vol.66, no.6, pp.279-285, 2013 (Released:2013-12-20)
参考文献数
37

脂質代謝異常に起因すると考えられる生活習慣病の予防, 改善に寄与する食品成分の探索を行った。脂質代謝制御において重要な働きをする生体内機能分子を定め, これら分子の機能, 活性を変動させ得る食品成分を, 分子細胞生物学的手法を駆使して樹立した評価系を用いて評価した。その際に機能分子として, 核内受容体, 転写因子, 受容体を設定し解析を行った。また, 入手可能な市販食品由来化合物を多数集めた食品成分ライブラリーを構築し, これらの活性を追跡した。結果として, 機能性食品化合物の作用点が標的分子を介したことを明確にする特徴を持つ。筆者らが見いだした機能性食品成分を列挙して解説した。
著者
佐藤 隆一郎 野口 忠 内藤 博
出版者
Center for Academic Publications Japan
雑誌
Journal of Nutritional Science and Vitaminology (ISSN:03014800)
巻号頁・発行日
vol.32, no.1, pp.67-76, 1986 (Released:2009-04-28)
参考文献数
20
被引用文献数
126 198

A casein phosphopeptide (CPP) was prepared from β-casein of cow's milk and the effect of this peptide on the absorption of calcium from a ligated segment of rat small intestine was investigated. CPP injected into a ligated loop of rat small intestine enhanced absorption of calcium from the loop and augmented the deposition of calcium in the femur. Furthermore, CPP inhibited the precipitation of calcium phos-phate in vitro, suggesting that this peptide enhances calcium absorption from the small intestinal lumen by increasing the concentration of soluble calcium. This new evidence confirms our previous hypothesis that CPP is an important factor in raising the availability of calcium in milk.