Gastroenterologia Japonica

, Volume 15, Issue 2, pp 177–183 | Cite as

Amounts of intestinal microflorae in relation to colon carcinogenesis. An experimental study

  • Kyotaro Kanazawa
  • Tomotari Mitsuoka
  • Koichiro Arai
  • Tadashi Yamamoto
  • Yasunori Hino
Original Article


Quantitative analysis of intestinal microflorae in the diverted and feces-containing portions of the colon after performing an ascendo-descendostomy Rouxen Y in Wistar-Lewis rats, the colonic portion from the ascending colon to the midportion of the descending colon being diverted from the fecal stream, disclosed a drastic decrease in the total amount of the intestinal microflora as well as most anaerobic microflorae in the diverted portion of the colon where the amount of the colonic content was extremely reduced.

This diverted segment was least susceptible of developing macroscopical epithelial neoplasia after exposure to a carcinogen, MNNG, sufficient in amount to evoke multiple large neoplasia in the ordinary colon, although microscopical intramucosal neoplastic foci were induced there.

Thus the existence of the intestinal content was essential for the process of promotion in experimental colonie carcinogenesis.

The close parallelism between amounts of intestinal content and amounts of intestinal microflorae, especially anaerobic ones, suggested the roles of anaerobic microflorae in colonie carcinogenesis.

Key Words

intestinal microflora intestinal content promotion of colonie carcinogenesis diversion of colonie content intestinal content and colon carcinogenesis 


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Copyright information

© The Japanese Society of Gastroenterology 1980

Authors and Affiliations

  • Kyotaro Kanazawa
    • 1
  • Tomotari Mitsuoka
    • 2
  • Koichiro Arai
    • 2
  • Tadashi Yamamoto
    • 3
  • Yasunori Hino
    • 4
  1. 1.Department of SurgeryUniversity of Tsukuba School of MedicineIbarakiJapan
  2. 2.Animal Physiology LaboratoryThe Institute of Physical and Chemical ResearchJapan
  3. 3.The Tokyo Metropolitan Institute of Clinical MedicineJapan
  4. 4.Department of SurgeryTokyo Metropolitan Geriatric HospitalYoikuin

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