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Carcinogenesis, Vol. 21, No. 4, 753-756, April 2000
© 2000 Oxford University Press

Carcinogenesis

Promotion of intestinal carcinogenesis by Streptococcus bovis

Stéphan Ellmerich1, Marie Schöller1, Benoît Duranton, Francine Gossé, Michel Galluser, Jean-Paul Klein1 and Francis Raul2

Université Louis Pasteur, Institut National de la Santé et de la Recherche Médicale, Contrat Jeune Formation 95-09, Institut de Recherche contre les Cancers de l'Appareil Digestif, 1 place de l'hôpital, BP 426, 67091 Strasbourg cedex, France and
1 Institut National de la Santé et de la recherche Médicale, Unité 392, Illkirch-Graffenstaden, France

The involvement of Streptococcus bovis, an member of the human gut flora, in colorectal neoplastic diseases is an object of controversy. The aim of this study was to determine the effects of S.bovis and of antigens extracted from the bacterial cell wall on early preneoplastic changes in the intestinal tract. Adult rats received i.p. injections of azoxymethane (15 mg/kg body weight) once per week for 2 weeks. Fifteen days (week 4) after the last injection of the carcinogen, the rats received, by gavage twice per week during 5 weeks, either S.bovis (1010 bacteria) or wall-extracted antigens (100 µg). One week after the last gavage (week 10), we found that administration of either S.bovis or of antigens from this bacterium promoted the progression of preneoplastic lesions through the increased formation of hyperproliferative aberrant colonic crypts, enhanced the expression of proliferation markers and increased the production of IL-8 in the colonic mucosa. Our study suggests that S.bovis acts as a promoter of early preneoplastic lesions in the colon of rats. The fact that bacterial wall proteins are more potent inducers of neoplastic transformation than the intact bacteria may have important implications in colon cancer prevention.


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