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1989 Fiscal Year Final Research Report Summary

Classification of human hypercholesterolemia by using somatic cell mutants with altered response to low density lipoprotein.

Research Project

Project/Area Number 62870012
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field General medical chemistry
Research InstitutionMedical College of Oita

Principal Investigator

KUWANO Michihiko  Medical College of Oita, Department of Biochemistry Professor, 医学部, 教授 (80037431)

Co-Investigator(Kenkyū-buntansha) KOHNO Kimitoshi  Medical College of Oita, Department of Biochemistry Assistant Professor, 医学部, 助教授 (00153479)
TAKAKI Ryosaburo  Medical College of Oita, Professor, 医学部, 教授 (90038620)
ONO Mayumi  Medical College of Oita, Department of Biochemistry Assistant, 医学部, 助手 (80128347)
Project Period (FY) 1987 – 1989
Keywordslow density lipoprotein / low density lipoprotein receptor / int gene / hypercholesterolemia / metabolic defects of cholesterol / defective O-glycosylation / somatic cell mutants / genetic-biochemistry
Research Abstract

Familial hypercholesterolemia (FH) are caused by naturally occurring mutation of the low density lipoprotein (LDL) receptor. The repetoire of the naturally occurring mutation is limited. We have developed somatic cell mutants in culture with altered response to LDL, and experimentally induced mutations were successfully introduced into the LDL receptor. Our LDL receptor mutants showed following properties : 1. High cholesterol metabolism and low LDL binding. 2. Maturation of LDL receptor is defective and molecular size of the matured receptor is 5,000 smaller than the wild type. 3. Defective 0-linked sugar chains of LDL receptor. 4.0-linked sugar chains are also defective in the human LDL receptor cDNA-transfected mutants. 5. The defective receptor mutation was expressed recessively and the int gene was mutated in our mutants. 6. Collaboration study with Cummings and Merkle suggested that the dysfunction of LDL receptor was caused by loss of 0-linked sugar chains in LDL-binding or its neighboring domain. 7. The int mutation was supposed to involve in altered Golgi function.
Our study strongly propose that 0-linked sugar chains are indispensable to normal function of LDL receptor. Further study is in progress whether int mutation may cause hypercholesterolemia in human and also isolation of the int gene should be done.

  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Seguchi Tadashi: "The dysfunctional LDL receptor in a monensin-resistant mutant of Chinese hamster ovary cells lacks selected O-linked oligosaccharide." Journal of Biological Chemistry.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kuwano Michihiko: "Somatic cell mutants of low density lipoprotein receptor" Cell Structure and Function. 14. 501-507 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shite Satoshi: "A new class mutation of low density lipoprotein receptor with altered carbohydrate chains." Journal of Biological Chemistry. 263. 19286-19289 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshimura Akihiko: "Low binding capacity and altered O-linked glycosylation of low density lipoprotein receptor in a monensin-resistant mutant of Chineses hamster ovary cells." Journal of Biological Chemistry. 262. 13299-13301 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshida Takashi: "Altered function and structure of low density lipoprotein receptor in compactin(ML236B)-resisitant mutants of Chinese hamter cell." Biochimica Biophysica Acta. 921. 575-586 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tomita Kichinobu: "Chinese hamster ovary cell mutant with defective down-regulation of low density lipoprotein receptors." Jouranl of Biological Chemistry. 263. 19286-19289 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kuwano Michihiko: "Drug resistance in mammalian cell Vol.II Anticancer and other drugs" CRC Press,R.S.Gupta(ed.), 20 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 桑野信彦: "Pharma Medica:「動脈硬化ー最近の話題」" メディカルレビュ-社, 10 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Seguchi Tadashi: "The dysfunctional LDL receptor in a monensin-resistant mutant of Chinese hamster ovary cells lacks selected O-linked oligosaccharide." Journal of Biological Chemistry.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kuwano Michihiko: "Somatic cell mutants of low density lipoprotein receptor." Cell Structure and Function 14:501-507 (1989).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shite Satoshi: "A new class mutation of low density lipoprotein receptor with altered carbohydrate chains." Journal of Biological Chemistry 263:19286-19289 (1988).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshimura Akihiko: "Low binding capacity and altered O-linked glycosylation of low density lipoprotein receptor in a monensin-resistant mutant of Chinese hamster ovary cells." Journal of Biological Chemistry 262:13299-13301 (1987).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshida Takashi: "Altered function and structure of low density lipoprotein receptor in compactin (ML236B)-resistant mutants of Chinese hamster cell." Biochimica Biophysica Acta 921:575-586 (1987).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tomita Kichinobu: "Chinese hamster ovary cell mutant with defective down-regulation of low density lipoprotein receptors." Journal of Biological Chemistry 263:19286-19289 (1987).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kuwano Michihiko: "Resistance to tunicamycin, compactin, amphotericin B and monensin." Drug Resistance in Mammalian Cell Vol.II Anticancer and other drugs (CRC Press, R.S.Gupta ed.)(1989).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-26  

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