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Selective Capture (Molecular Recognition) of Acidic Steroids by Dietary Resistant Protein and Modeling of Antitumor Foods

Research Project

Project/Area Number 13660132
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 食品科学・栄養科学
Research InstitutionKyoto Prefectural University

Principal Investigator

IWAMI Kimikazu  Graduate School of Agriculture Professor, 農学研究科, 教授 (00026569)

Co-Investigator(Kenkyū-buntansha) SAEKI Thoru  Graduate School of Agriculture Lecturer, 農学研究科, 講師 (00275190)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2001: ¥2,700,000 (Direct Cost: ¥2,700,000)
Keywordscapture of bile acids / resistant protein / Scatchard plot / deoxycholic acid / cancer promoter / secondary bile acid / equilibrium dialysis / acidic steroids / 胆汁酸捕捉能 / 平衡透析 / スキャチャードプロット / 胆汁酸分子認識 / 実験的肝臓癌大腸癌抑制 / 胆汁酸包接 / 分子認識 / 親和標識 / 抗腫瘍食品
Research Abstract

An insoluble "high-molecular-weight fraction" centrifugally separable from Protin^R-digested soy protein isolate has been referred to as HMF, which has a high capacity to capture bile acids and to accerelate their fecal excretion. A significant correlation was observed for the fecal excretion of nitrogen, lipid and acidic or neutral steroid in HMF-fed rats. Therefor, the feces from HMF-fed rats were rinsed out in pH 7.4 phosphate buffer, 70% ethanol and 1% Triton-containing 8M urea, and the resulting insoluble residue was examined for its amino acid composition and bile acid-caturing capacity. The constituent amino acids were Leu > Ala > Val, Ile > Gly > Phe > Pro > Tyr > Ser > Glu etc. in order of molar ratio, being quite similar in pattern to those of the remnant after artificial digestion with mammalian digestive enzymes. The bile acid-capturing capacity turned out to be 14 μmol/g feces which was nearly compatible with the amount of bile acids extractable from powdered whole feces w … More ith 70% ethanol after washing with the phosphate buffer. Accordingly the HMF remnant as well as the insoluble feces should be called "soybean resistant protein" with due consideration for no more digestible characteristic. A comparison of bile acid-capturing capacity was made by equilibrium dialysis on litocholic acid (LCA), deoxycholic acid (DCA), chenodeoxycholic acid (CDCA), hyodeoxycholic acid (HDCA), taurodeoxycholic acid (TDCA), glycocheno-deoxycholic acid (GCDCA), ursodeoxycholic acid (UDCA) and cholic acid (CA). Consequently, soybean resistant protein had a high affinity for bile acids in order of LCA, DCA, CDCA >> HDCA > TDCA, GCDCA > UDCA, CA. Noteworthily there was a clear difference between DCA and CA in that respect. This difference was also ascertained from a pattern of uncompetitive inhibition by DCA in Eadie-Scatchard plot of bound CDCA against its corresponding bound/free ratio with the aid of ^<14>C-CDCA. When its bile acid-capturing capacity was compared with those of various resistant proteins prepared by artificial digestion from leguminous and cereal food proteins, any preparation was far inferior to soybean resistant protein in affinity for secondary bile acid. The majority of primary bile acids escaped from intestinal absorption undergo dehydroxylation by enteric bacteria and convert to secondary bile acids fairly risky as promorter for carcinogenesis. Taking into account such a high affinity of resistant proteins for secondary bile acids, their successive intake in ordinary eating habits contributes greatly to cancer prevention besides inprovement in lipidemia or cholesterolemia. Less

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] Kato N, Iwami K: "Resistant protein ; its existence and function beneficial to health"J.Nutr.Sci.Vitaminol.. 48. 1-5 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Saeki T et al.: "Effect of Cys mutation on taurocholic acid transport by mouse ileal and hepatic sodium-dependent bile acid transporters"Biosci.Biotech.Biochem.. 66. 467-470 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Saeki T et al.: "Characterization of cloned mouse Na^+ taurocholate comtransporting polypeptide by trnasient expression in COS-7 cells"Biosci.Biotech.Biochem.. 66. 1116-1118 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kanamoto R et al.: "Non-involvement of the K-ras mutation in colon carcinogenesis prompted by dietary deoxycholate in azoxymethane-treated rats"Biosci.Biotech.Biochem.. 65. 848-852 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kanamoto R et al.: "Soybean resistant proteins interrupt an enterohepatic circulation of bile acids and suppress experimentally induced liver tumorigenesis"Biosci.Biotech.Biochem.. 65. 999-1002 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 岩見公和: "レジスタントプロテインの機能性とその応用"ジャパンフードサイエンス. 40(12). 40-44 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kato N and Iwami K.: "Resistant protein ; its existence and function beneficial to health"J Nutr Sci Vitaminol.. 48. 1-5 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Saeki T et al.: "Effect of Cys mutation on taurocholic acid transport by mouse ileal and hepatic sodium-dependent bile acid transporter"Biosci Biotech Biochem.. 66. 467-470 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Saeki T et al.: "Characterization of cloned mouse Na^+/taurocholate cotransporting ; polypeptide by transient expression in COS-7 cells"Biosci Biotech Biochem.. 66. 1116-1118 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kanamoto R et al.: "Non-involvement of the K-ras mutation in colon carcinogenesis prompted by dietary deoxycholate in azoxymethane-treated rats"Biosci Biotech Biochem.. 65. 848-852 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kanamoto R et al.: "Soybean resistant proteins interrupt an enterohepatic circulation of bile acids and suppress experimentally induced liver tumorigenesis"Biosci Biotech Biochem.. 65. 999-1002 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kato N, Iwami K: "Resistant protein ; its existence and function beneficial to health"J. Nutr. Sci. Vitaminol.. 48. 1-5 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Saeki T et al.: "Effect of Cys mutation on taurocholic acid transport by mouse ileal and hepatic sodium-dependent bile acid transporters"Biosci. Biotech. Biochem.. 66. 467-470 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Saeki T et al.: "Characterization of cloned mouse Na^+/taurocholate cotransporting polypeptide by trnasient expression in COS-7 cells"Biosci. Biotech. Biochem.. 66. 1116-1118 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kanamoto R et al.: "Non-involvement of the K-ras mutation in colon carcinogenesis prompted by dietary deoxycholate in azoxymethane-treated rats"Biosci. Biotech. Biochem.. 65. 848-852 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kanamoto R et al.: "Soybean resistant proteins interrupt an enterohepatic circulation of bile acids and suppress experimentally induced liver tumorigenesis"Biosci. Biotech. Biochem.. 65. 999-1002 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] 岩見公和: "レジスタントプロテインの機能性とその応用"ジャパンフードサイエンス. 40(12). 40-44 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] 岩見公和: "レジスタントプロテインの機能性とその応用"ジャパンフードサイエンス. 40・12. 40-44 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 加藤範久, 岩見公和: "Resistant protein ; its existence and function beneficial to health"J. Nutr. Sci. Vitaminol.. 48・1. 1-5 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 佐伯 徹 他4名: "Effects of Cys mutation on taurocholic acid transport by mouse ileal and hepatic sodium-dependent bile acid transporters"Biosci. Biotechnol. Biochem.. 66(印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 佐伯 徹 他3名: "Characterization of cloned mouse Na^+/taurocholate cotransporting peptide by transient expression in COS-7 cells"Biosci. Biotechnol. Biochem.. 66(印刷中). (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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