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Central mechanism controlling the expression of estrous behavior and its manipulation in the dog.

Research Project

Project/Area Number 10839011
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 動物臨床医学
Research InstitutionOsaka Prefecture University

Principal Investigator

INABA Toshio  Univ. of Osaka Pref., Pref., Coll. of Agricul., Associate Professor, 農学部, 助教授 (00137241)

Co-Investigator(Kenkyū-buntansha) KAWATA Noritoshi  Univ. of Osaka Pref., Coll. of Agricul., Research Associate, 農学部, 助手 (80221901)
TAMADA Hiromichi  Univ. of Osaka Pref., Coll. of Agricul., Assistant Professor, 農学部, 講師 (10155252)
SAWADA Tsutomu  Univ. of Osaka Pref., Coll. of Agricul., Professor, 農学部, 教授 (60081600)
TORII Ryuzo  Siga Univ. of Mel. Sci., Inst. for Exp. Anim., Associate Professor, 医学部・付属動物実験施設, 助教授 (50106647)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1999: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1998: ¥2,600,000 (Direct Cost: ¥2,600,000)
KeywordsDog / Oestrus Induction / Gonadotrophin-Releasing Hormone / Hypothalamus / Anterior Pituitary / Estrogen Receptor mRNA / Estrogen / Luteinizing Hormone / 発情周期 / 子宮 / GnRHレセプター遺伝子 / エストロジェンレセプター / プロジェステロン
Research Abstract

Central mechanism controlling the expression of estrous behavior and stimulatory effects of a sustained release formulation of the gonadotrophin-releasing hormone agonist (GnRH-A) on reproductive function in the dog were examined, and the following results were obtained.
1. An increase in the mean plasma levels of luteinizing hormone (LH) occurred from mid to late anestrus with the change in pulse patterns, followed by an increase in the mean plasma levels of estrogen and progesterone.
2. The increase in GnRH release from hypothalamus could be responsible for the increasing secretion of LH which occurs during the progression of anestrus.
3. Enhancement of hypothalamic estrogen receptor gene expression which may be regulated by estrogen might be one factor leading to the increased GnRH release in late anestrus.
4. During the course of anestrus pituitary GnRH receptor gene expression increased while the pituitary responded accordingly.
5. In proestrous bitches estrogen increased uterine sensitivity by increasing it's own receptor concentration, suggesting the preparation for estrus.
6. A single injection of sustained-release formulation of GnRH-A in anestrous bitches resulted in an induced heat.
These results suggest that, as a possible central mechanism controlling the expression of estrous behavior, the enhancement of hypothalamic estrogen receptor gene expression in late anestrus may lead to the increase in GnRH release, while pituitary responsiveness to thereby resulting in the resumption of ovarian and uterine activity with the return to estrus. They also indicate that microencapsulated LA can be useful in controlling the reproductive function in the dog.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] H. Tani, T. Inaba: "Enhancement of estrogen receptor gene expression in the mediobasal hypothalamus during late anestrus in the beagle bitch"Neuroscience Letter. 227・3. 149-152 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Toshio Inaba: "Induction of fertile estrus in bitches using a sustainedrelase formulation of GnRH agonist (leuprolide acetate)"Theriogenology. 49・5. 975-982 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 稲葉俊夫: "犬の臨床繁殖-発情回帰の内分泌"InfoVets. 1・4. 45-49 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 稲葉俊夫: "犬の臨床繁殖-発情の人為的調節"InfoVets. 1・5. 4-8 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Tani, T. Inaba: "Increased LH pulse frequency and estrogen secretion associated with termination of anestrus followed By enhancement of uterine estrogen receptor gene expression in the beagle bitch"Theriogenology. 52・4. 593-607 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H.Tani, T.Inaba: "Enhancement of estrogen receptor gene expression in the mediobasal hypothalamus during late anestrus in the beagle bitch"Neuroscience Letter. 227・3. 149-152 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Inaba: "Induction of fertile estrus in bitches using a sustained-release formulation of GnRH agonist (leuprolide acetate)"Theriogenology. 49・5. 975-982 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Inaba: "Reproduction in the dog : Endocrine mechanism controlling the return of estrus"InfoVets. 1・4. 45-49 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Inaba: "Reproduction in the dog : Control of estrus"InfoVets. 1・5. 4-8 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H.Tani, T.Inaba: "Increased LH pulse frequency and estrogen secretion associated with termination of anestrus followed by enhancement of uterine estrogen receptor gene expression in the beagle bitch"Theriogenology. 52・4. 593-607 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 稲葉俊夫: "犬の臨床繁殖ー発情回帰の内分泌"InfoVets. 1・4. 45-49 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] 稲葉俊夫: "犬の臨床繁殖ー発情の人為的調節"InfoVets. 1・5. 4-8 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hiroyuki Tani, Toshio Inaba: "Increased LH pulse frequency and estrogen secretionaassociated with termination of anestrus followed by enhancement of uterineestrogen receptor gene expression in the beagle bitch"Theriogenology. 52・4. 593-607 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hiroyuki Tani: "Enhancement of estrogen receptor gene expression in the mediobasal hypothalamus during late anestrus in the beagle bitch" Neuroscience Letter. 227・3. 149-152 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] Toshio Inaba: "Induction of fertile estrus in bitches using a sustained-relase formulation of a GnRH agonist(leuprolide acetate)" Theriogenology. 49・5. 975-982 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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