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Involvement of gonadotropin in snout extension in the Japanese minnow during ovulation

Research Project

Project/Area Number 23580263
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field General fisheries
Research InstitutionKitasato University

Principal Investigator

CHIBA hiroaki  北里大学, 海洋生命科学部, 准教授 (50236816)

Co-Investigator(Kenkyū-buntansha) MORIYAMA Shunsuke  北里大学, 海洋生命科学部, 教授 (50222352)
Project Period (FY) 2011 – 2013
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsアブラハヤ / 排卵 / 吻部 / 生殖腺刺激ホルモン / 結合組織 / 受容体 / 卵巣 / 吻部伸長 / 生殖腺 / 下垂体 / ホルモン / 遺伝子発現
Research Abstract

In this study,to elucidate the mechanism of snout extension in the Japanese minnow, we examined the morphological changes during oocyte maturation and ovulation, both in vivo and in vitro. Fish injected with Human Chorionic Gonadotropin (HCG) ovulated and showed an increase in the rate of extension of snout length. Histological observation indicated that HCG-induced snout extension was accompanied by a marked expansion of irregular material in the connective tissue. Wet and dry weight measurements indicated that water accumulation during ovulation was the major factor contributing to the increase in snout volume. HCG also caused an increase in the weight of snout fragments in vitro. The results suggest that GTHinduces extension fo snout length through absorption of water in the connective tissue, the offering new insights into the function of GTH in reproduction.

Report

(4 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Research-status Report
  • 2011 Research-status Report
  • Research Products

    (8 results)

All 2013

All Presentation (8 results) (of which Invited: 1 results)

  • [Presentation] アブラハヤの排卵時における吻部伸長と結合組織内細胞質の変化2013

    • Author(s)
      千葉洋明、西拓也、武田圭介、藤本泰文
    • Organizer
      平成25年度日本水産学会春季大会
    • Place of Presentation
      東京
    • Year and Date
      2013-03-29
    • Related Report
      2013 Final Research Report
  • [Presentation] アブラハヤの排卵に伴う吻部伸長における生殖腺刺激ホルモンの役割2013

    • Author(s)
      千葉洋明、藤本康文
    • Organizer
      シンポジウム:性徴・性分化と内分泌日本下垂体研究会第28回学術集会
    • Place of Presentation
      花巻
    • Related Report
      2013 Final Research Report
  • [Presentation] Involvement of gonadotropin in snout extension in the Japanese minnow during ovulation2013

    • Author(s)
      Chiba H, Nishi T, Takeda K, Fujimoto Y.
    • Organizer
      The 17th International Congress of Comparative Endocrinology
    • Place of Presentation
      Barcelona, Spain
    • Related Report
      2013 Final Research Report 2012 Research-status Report
  • [Presentation] Smell to spawn : Olfaction and the reproductive axis in homing chum salmon Oncorhyncus keta2013

    • Author(s)
      Palstra A, Fukuya K, Chiba H, Planas J, Ueda H.
    • Organizer
      The 17th International Congress of Comparative Endocrinology
    • Place of Presentation
      Barcelona, Spain
    • Related Report
      2013 Final Research Report
  • [Presentation] Involvement of gonadotropin in snout extension in the Japanese minnow during ovulation2013

    • Author(s)
      Chiba H, Nishi T, Takeda K, Fujimoto Y
    • Organizer
      The 17th International Congress of Comparative Endocrinology
    • Place of Presentation
      スペイン、バルセロナ
    • Related Report
      2013 Annual Research Report
  • [Presentation] Smell to spawn: Olfaction and the reproductive axis in homing chum salmon Oncorhyncus keta2013

    • Author(s)
      Palstra A, Fukuya K, Chiba H, Planas J, Ueda H
    • Organizer
      The 17th International Congress of Comparative Endocrinology
    • Place of Presentation
      スペイン、バルセロナ
    • Related Report
      2013 Annual Research Report
  • [Presentation] アブラハヤの排卵に伴う吻部伸長における生殖腺刺激ホルモンの役割2013

    • Author(s)
      千葉洋明、藤本康文
    • Organizer
      日本下垂体研究会 第28回学術集会シンポジウム
    • Place of Presentation
      岩手県、花巻市
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] アブラハヤの排卵時における吻部伸長と結合組織内細胞質の変化2013

    • Author(s)
      千葉洋明、西拓也、武田圭介、藤本泰文
    • Organizer
      平成25年度日本水産学会春季大会
    • Place of Presentation
      東京海洋大学
    • Related Report
      2012 Research-status Report

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Published: 2011-08-05   Modified: 2019-07-29  

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