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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 2002 Jan;93(1):36–41. doi: 10.1111/j.1349-7006.2002.tb01198.x

Chemopreventive Effect of Lactobacttlus rhamnosus on Growth of a Subcutaneously Implanted Bladder Cancer Cell Line in the Mouse

Boon‐Kian Lim 1, Ratha Mahendran 2, Yuan‐Kun Lee 1, Boon‐Huat Bay 3,✉
PMCID: PMC5926873  PMID: 11802806

Abstract

Lactic acid bacteria are known to have beneficial effects on the host, such as preventing carcinogenesis. The present study was designed to evaluate the chemopreventive effects of Lactobacttlus rhamnosus strain GG (LGG) in suppressing bladder cancer formation in a murine subcutaneous model of bladder cancer involving the inoculation of MB49 cells in C57B/L6 mice. After tumor implantation, one group of mice (n=8) was fed LGG immediately. The remaining mice that had tumors between 0.03–0.1 cm3 were divided into two groups: those fed LGG after 7 days (n=7) and those fed saline (n=7). A second group of mice without any inoculation of MB49 cells was fed either LGG (n=10) or saline (n=10) and served as non‐tumor‐bearing controls. LGG was administered orally at 1.6×l08 colony‐forming units daily. Mice fed LGG immediately after tumor cell implantation formed smaller tumors and some did not develop tumors (2 out of 8 mice), when the tumor burden was small. The level of spleen CD3, CD4 and CD8a T lymphocytes, as well as natural killer cells in mice fed immediately with LGG was also higher than that in control tumor‐bearing mice. There was an increase in lymphocytes and granulocytes in tumor sections, especially from the immediately fed group as compared to the controls. Our results suggest that oral consumption of LGG may prevent tumor growth via modulation of the immune system. The potential of LGG as an adjunct therapy in the treatment of bladder cancer could be further explored.

Keywords: Lactobacillus rhamnosus strain GG, Bladder carcinogenesis, MB49 cell line, Immunomodulation

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