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. 1987 Sep;25(2):100–104. doi: 10.1007/BF00199948

Inhibition of tumor metastasis of lewis lung carcinoma in C57BL/6 mice by intrapleural administration of Lactobacillus casei

Takeshi Matsuzaki 1,✉, Teruo Yokokura 1
PMCID: PMC11037970  PMID: 2959360

Abstract

The antimetastatic effect of Lactobacillus casei YIT9018 (LC 9018) against Lewis lung carcinoma (3LL) in C57BL/6 mice was determined. Intrapleural (i.pl.) administration of LC 9018 was effective in inhibiting pulmonary metastasis after s.c. inoculation of 3LL tumors into C57BL/6 mice. The combination of i.pl. and intralesional or i.v. injections of LC 9018 also markedly inhibited pulmonary metastasis in 3LL-bearing mice. The i.pl. administration of LC 9018 into mice induced an increase in the number of thoracic exudate cells (TEC) and the cell population in the TEC was mainly polymorphonuclear leukocytes in the early stage, while macrophages were dominant in the late stage. In addition, in vitro cytolytic activity against 3LL cells and natural killer cell activity of TEC were augmented by the i.pl. administration of LC 9018. Furthermore, i.pl. administration of LC 9018 into the mice rendered their lung macrophages tumoricidal for 3LL cells in vitro. These results show that TEC induced by i.pl. administration of LC 9018 played a key role in the inhibtion of metastasis in 3LL-bearing mice.

Keywords: Natural Killer, Natural Killer Cell, Lactobacillus, Late Stage, Killer Cell

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