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General principle involved in the mechanism of oocyte maturation

Research Project

Project/Area Number 04044177
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionOkazaki National Research Institutes National Institute for Basic Biology

Principal Investigator

NAGAHAMA Yoshitaka  National Institute for Basic Biology, Professor, 基礎生物学研究所, 教授 (50113428)

Co-Investigator(Kenkyū-buntansha) LOHKA Manfred J.  University of Calgary, Professor, 助教授
MALLER James L.  University of Colorado School of Medicine, Professor, ハワードヒューズ医学研究所, 教授
YAMASHITA Masakane  Hokkaido University, Associate Professor, 理学部, 助教授 (30202378)
TANAKA Minoru  National Institute for Basic Biology, Assistant Prof., 基礎生物学研究所, 助手 (80202175)
YOSHIKUNI Michiyasu  National Institute for Basic Biology, Assistant Prof., 基礎生物学研究所, 助手 (50210662)
IZUMI Tetsuro  University of Colorado, Postdoctoral Fellow
NODA Youichi  University of Kyoto, Associate Professor
野田 洋一  京都大学, 医学部, 助教授 (50115911)
MANFRED J Lo  カルガリー大学, 生物学教室, 助教授
JAMES L Mall  コロラド大学, ハワードヒューズ医学研究所, 教授
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1993: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1992: ¥4,100,000 (Direct Cost: ¥4,100,000)
KeywordsOocyte maturation / Vertebrate / Amphibians / Fishes / Maturation-promoting factor (MPF) / Maturation-inducing hormone / Gonadotropin / リン酸・脱リン酸化 / リン酸脱リン酸化
Research Abstract

The purpose of this cooperative project was that two research groups directed by Drs.Yoshitaka Nagahama (Okazaki, Japan) and J.L.Maller (Denver, USA) collaborate to clarify the general principle involved in the regulatory mechanism of oocyte maturation in vertebrates, in particular amphibians (Maller, USA) and fishes (Nagahama, Japan).
In both amphibians (Xenopus) and fishes (salmonids, goldfish, etc.), gonadotropins (probably LH-like gonadotropin) are responsible for triggering oocyte maturation. However, in both cases, gonadotropins do not act directly on the oocyte, but act on the ovarian follicle cells to produce maturation-inducing hormones (progesterone in amphibians and 17alpha, 20beta-dihydroxy-4-pregnen-3-one, 17alpha, 20beta-DP, in fishes). The site of the action of both maturation-inducing hormones is the surface of the oocytes ; specific surface receptors responsible for the progesterone-and 17alpha, 20beta-DP-induced oocyte maturation were found on the plasma membrane of Xe … More nopus, rainbow trout and flounder oocytes. Two research groups will continuously collaborate to purify and characterize these steroid hormone membrane receptors.
Microinjection of progesterone and 17alpha, 20beta-DP failed to induce oocyte maturation, suggesting that they do not act directly on the germinal vesicle but seems to act through a third mediator in the oocyte cytoplasm. This third mediator of cytoplasmic nature has been called maturation-promoting factor (MPF). MPF was purified and characterized from oocytes of Xenopus and goldfish (carp), consisting of two common components, cdc2 kinase and cyclin B. Although the components of MPF in Xenopus and goldfish oocytes, are the same, the mechanisms of MPF activation are different between these two species. In goldfish, 17alpha, 20beta-DP induces immature oocytes to synthesize cyclin B, which in turn activates preexisting 35-kDa cdc2 kinase through its threonine (Thr161) phosphorylation, producing the 34-kDa active cdc2 kinase. These mechanisms of MPF activation in fish oocytes apparently differ from those in Xenopus, in which cyclin B is present in immature oocytes and forms a complex with cdc2 kinase (pre-MPF). Furthermore, in Xenopus oocytes, dephosphorylation of threonine (Thr14) and tyrosine (Tyr15) is required for cdc2 kinase activation. However, it is doubtful that tyrosine (Tyr15) dephosphorylation of cdc2 kinase is not a prerequisite for its activation during goldfish oocyte maturation, since the activation is not inhibited by vanadade, a protein phosphatase inhibitor commonly used for inhibiting cdc25 activity that dephosphorylates tyrosine (Tyr15) of cdc2 kinase, thereby inhibits its activation. Less

Report

(2 results)
  • 1993 Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] Kamijo,M.,Yasuda,H.,Yau,P.M.,Yamashita,M.and Nagahama,Y.: "Preferenie of human cdc2Kinase for peptide substrate" Peptide Pesearch. 5. 281-285 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yoshikuni,M.,Shibata,N.and Nagahama,Y.: "Isolation and expression of rainbow trout(Oncorhynchus mykiss)ovarian cDNA encoding 3β-hydroxysteroid dehydrogenase/△^<5-4>-isomerase." Fish Physiology and Biochemistry. 11. 15-24 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Natsuyama,S.,Noda,Y.,Yamashita,M.,Nagahama,Y.and Mori,T.: "Superoxide dismutase and thioiredoxin restore defective p34^<cdc2>Kinase activation in mouse two-cell block." Biochemica et Biophysica Acta. 1176. 90-94 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Iwao,Y.,Sakamoto,N.,Takahara,K.,Yamashita,M.and Nagahama,Y.: "The egg nucleus regulates the behavior of sperm nuclei as well as cycling of MPF in physiologically polyspermic necot eggs." Developmentol Biology. 160. 15-27 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Katsu,Y.,Yamashita,M.,Kajiura,H.and Nagahama,Y.: "Behavior of the components of maturation-promoting factor,cdc2Kinase and cyclin B,during oocyte maturation ingoldfish." Developmentol Biology. 160. 99-107 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Onoe,S.,Yamashita,M.,Kajiura,H.and Nagahama,Y.: "A fish homolog of the cdc2-related protein p40:its cDNA cloning and expression in oocytes" Biomedical Research. 14. 441-444 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Katsu,Y.,Yamashita,M.,Kajiura,H.and Nagahama,Y.(1993): "Behaviour of the components of maturaion-promoting factor,cdc2 kinase and cyclin B,during oocyte maturation of goldfish" Developmental Biology.

    • Related Report
      1992 Annual Research Report
  • [Publications] Tokumoto,T.,Yamashita,M.,Yoshikuni,M.,and Nagahama,Y.: "Purification of latent proteasome(20S proteasome)and demonstration of active proteasome in goldfish(Carassuis anratus)oocyte cytosol" Journal of Biological Chemistry.

    • Related Report
      1992 Annual Research Report
  • [Publications] Walker,D.,Yamashita,M.,Nagahama,Y.,and Maller J.L.: "Activation of Xenopus maturation-promoting factor(MPF)by synthesized goldfish MPF" Developmental Biology.

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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