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Development of a new Dietary Regimen for Mice, Which Suppresses Spontaneous Tumors

Research Project

Project/Area Number 01870027
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field Hygiene
Research InstitutionAkita University School of Medicine

Principal Investigator

KAMIYAMA Sigetosi  Akita University School of Medicine Department of Hygiene, Professor, 医学部, 教授 (80004547)

Co-Investigator(Kenkyū-buntansha) KOIZUMI Akio  Akita Univ. Schl of Med. Assoc. Prof., 医学部, 助教授 (50124574)
TAKAHASI Hirosi  National Institute for Environ. Sciences Group Leader, 動物施設, 室長 (80101046)
HIRANO Seisiro  National Institute for Environ. Sciences Researcher, 環境保健部, 主任研究員 (20150162)
SUZUKI Kazuo  National Institute for Environ. Sciences Group Leader, 環境保健部, 室長 (90109918)
Project Period (FY) 1989 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥7,700,000 (Direct Cost: ¥7,700,000)
Fiscal Year 1991: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1990: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1989: ¥4,500,000 (Direct Cost: ¥4,500,000)
KeywordsMouse / Energy Restriction / Mammary Tumor / Mouse Mammary Tumor Virus / Asbestos / Pulmonary Adenoma / Dose-Response Relationship / A / Jマウス / エネルギ-制限 / 用量-反応関係 / 制限食 / カロリ- / 自然発癌 / 肺癌
Research Abstract

Chronic bioassays are one of obligatory requlrement to register chemicals or drugs for human or veterinary uses. Common protocols use rats. and mice for choice of animals for chronic bioassays because of the con'ven3. ence and the abundance of historical data.
It is well known that mice have very high incidence of tumors specific to strains. In general, the susceptibility of inbred strains and their hybrids to specific tumor induction by rodent carcinogens is related to the frequencies of spontaneous tumors of the same type.
Energy restriction (ER) retards aging processes and extends life-span of rodents. The major causes of natural causes of mortalities of rodents are neoplasms. Inhibition of tumor growth by ER appears to play a primary role in expanding longevities of rodents.
In the present study, we investigated the effects of ER on the sponteneously occuring mammary tumors in SHN mice and on dose-response relationship between asbestos and pulmonary adenocarcinoma in A/J mice.
ER sppressed mouse mamary tumors in SHN mice completely while about 65% of the control mice had developed mammary tumors by 28 months of age. Energy restriction was shown to suppress mouse mammary tumor virus (MMTV) gene expression. Altogether, ER was concluded to inhibit mammary tumor development by decreasing gene expression of MMTV, by keeping the mammary glands immature, and by suppression of prolactin production.
The increases in dose levels of asbestos results in the increases in both tumor sizes and numbers of tumori3 in ER mice. In agreement with the above trend, the ratio of tumor free mice decreased in a dose-associated manner. In contrast, an apparent dose-associated increases of tumor sizes or number of tumors were not found in control diet groups.
The present study demonstrated that genetic backgrounds may perturbs the chronic bioassay. The energy restriction, however, can provide a very powerful tool to produce noise-free chronic bioassays.

Report

(4 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Koizumi A.et al.: "Caloric Restriction pertarbs the pifuitasy-ovarian axis and inhibits mouse mammary tumor virn production ni a high-spontaneous -mammary-tumor-incidence strami(C3H/SHN)" Meich.Ageing Develop. 49. 93-104 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Koizumi et al.: "EHects of energy reofiction on mouse mammay tumor virns m RNA levels in mammary glands and utems and on uterive evdometrial hyperplasi a and pituitary mstology" J.Nutr.120. 1401-1411 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Koizumi et al.: "Speutic inlibition of pituitany prolaetin pnduction by enagy restriction ir C3H/SHN female mice" Mech.Ageing Develop.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Koizumi et al.: "A clear dose-response relation suip between asbestos and incidenos of pulmonary adeno cauinomas in energy restricted mice while il is not found in control diet mice"

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] KOIZUMI A., MASUDA H., WADA Y., TSUKADA M., KAWAMURA K., KAMIYAMA S., WALFORD R. L.: "Caloric restriction perturbs the pituitaryovarian axis and inhibits mouse mammary tumor virus production in a high-spontaneous-mammary-tumor-incidence mouse strain (C3H/SHN)" Mech. Agine Develop.49. 93-104 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] KOIZUMI A., WADA Y., TUSKADA M., KAMIYAMA S., WEINDRUCH R.: "Effects of energy restriction on mouse mammary tumor virus mRNA levels in mammary glands and uterus and on uterine endometrial hyperplasia and pituitary histology in C3H/SHN F1 mice." J. Nutr.120. 1401-1411 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] KOIZUMI A., TSUKADA M., MASUDA H., KAMIYAMA S., WALFORD R. L.: "Specific inhibition of pituitary prolactin production by energy restriction in C3H/SHN female mice." Mech. Ageing Devlop.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] KOIZUMI A., HIRANO S., SUZUKI K. T., KAMIYAMA S.: "A clear doseresponse relationship between asbestos and incidences of pulmonary adenocarcinomas in energy restricted mice while it is not found in control diet mice."

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Koizumi A.etal: "Speafc inlibition of pitutay prolactin prolaction by evergy restrichion in CEH/SHN female mice" Mech.Ageing Develop.

    • Related Report
      1991 Annual Research Report
  • [Publications] Koizumi A.etal: "A clear close-reoponse relationship between asbestos and invideuces of pulmonary adavocarcinsnas in evergy resrvicted mice while it is not found in conpol diet mice."

    • Related Report
      1991 Annual Research Report

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Published: 1989-04-01   Modified: 2019-02-15  

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