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Physiological significance of IGF-binding protein protease in follicular growth of human ovary

Research Project

Project/Area Number 14571581
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Obstetrics and gynecology
Research InstitutionKyorin University

Principal Investigator

IWASHITA Mitsutoshi  Kyorin University, Obstetrics & Gynecology, Professor, 医学部, 教授 (30124936)

Co-Investigator(Kenkyū-buntansha) ANDO Motomu  Kyorin University, Obstetrics & Gynecology, Assistant Professor, 医学部, 講師 (10301483)
KATSUMATA Yuuko  Kyorin University, Obstetrics & Gynecology, Assistant, 医学部, 助手 (00246357)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2004: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2003: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2002: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsInsulin-like growth factor / IGF-binding protein / FSH / follicular growth / protease / granulose cell / estradiol / IGF-II / follicular develoment / IGFBP-4 / protease / follice development / 卵巣 / 卵胞 / IGF
Research Abstract

Follicular fluid from dominant follicles but not atretic follicles contains insulin-like growth factor (IGF) binding protein-4 (IGFBP-4) proteolytic activity. The effect of FSH and IGFs on IGFBP-4 proteolytic activity was studied using granulosa cell culture. Proteolytic activity was assessed by the incubation of [^<125>I]IGFBP-4 with medium and cleaved products were analyzed by autoradiography. The iodinated IGFBP-4 was cleaved into 18 kDa fragment when cells were incubated with FSH or IGFs while IGFBP-4 was remained intact in control culture. Inhibition of IGFBP-4 degradation by several protease inhibitors suggests that IGFBP-4 degradation was induced by a metalloserine protease. The degradation of IGFBP-4 was not stimulated when cells were incubated with the IGF-I analogue, LR3-IGF-I, and insulin that bind to IGF-I receptor but have less or no affinity for IGFBPs. Addition of IGFs but not FSH to medium from untreated GC culture stimulated proteolysis of [^<125>I]IGFBP-4. Similarly, exogenously added covalently cross-linked [^<125>I]IGF-II-IGFBP-4 complexes were proteolyzed, however, IGFs did not enhance the degradation of the complexes. These results suggest that human granulosa cells produce IGFBP-4 protease and that the increased susceptibility of IGFBP-4 to proteolysis is induced by the binding of IGFs to IGFBP-4. These novel mechanisms may be important to modulate IGF-mediated folliculogenesis in the ovary.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (6 results)

All 2004 2003 Other

All Journal Article (5 results) Publications (1 results)

  • [Journal Article] PCOSとインスリン様成長因子2004

    • Author(s)
      岩下光利
    • Journal Title

      産科と婦人科 71

      Pages: 729-735

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] PCOS and insulin-like growth factor.2004

    • Author(s)
      Mitsutoshi Iwashita
    • Journal Title

      Obstet Gynecol (Tokyo) 71

      Pages: 729-735

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 卵巣機能発現におけるIGFシステムの局所調節作用2003

    • Author(s)
      岩下光利
    • Journal Title

      産婦人科治療 87

      Pages: 502-508

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Local regulation of IGF system in ovarian function.2003

    • Author(s)
      Mitsutoshi Iwashita
    • Journal Title

      Obstetrical and Gynecological Therapy 87

      Pages: 502-508

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 卵巣機能発現におけるIGFシステムの局所作用2003

    • Author(s)
      岩下光利
    • Journal Title

      産婦人科治療 87

      Pages: 502-508

    • Related Report
      2004 Annual Research Report
  • [Publications] 岩下光利: "卵巣機能発現におけるIGFシステムの局所作用"産婦人科治療. 87. 502-508 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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