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Increased Production of Cytotoxic Macrophage Progenitors by Lactobacillus casei in Mice
Author(s) -
Nanno Masanobu,
ShimizuTakeda Takako,
Mike Akito,
Ohwaki Makoto,
Togashi Yuji,
Suzuki Ryuji,
Kumagai Katsuo,
Mutai Masahiko
Publication year - 1989
Publication title -
journal of leukocyte biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.819
H-Index - 191
eISSN - 1938-3673
pISSN - 0741-5400
DOI - 10.1002/jlb.46.2.89
Subject(s) - biology , cytotoxic t cell , spleen , lactobacillus casei , haematopoiesis , bone marrow , progenitor cell , syngenic , macrophage , microbiology and biotechnology , in vivo , splenocyte , immunology , in vitro , stem cell , immune system , biochemistry , fermentation
Heat‐killed Lactobacillus casei YIT9018 (LC9018). when administered intravenously to normal mice, induced increase in Mac‐1 + cells and Mac‐2 + cells but not in Mac‐3 + cells in spleen. The number of both populations changed in the same time course and was maximal 14 d after the administration. To know the effect of LC9018 on hematopoietic progenitor level, we examined the number of macrophage colony‐forming cells (M‐CFC), granulocyte‐macrophage CFC (GM‐CFC), and colony‐forming units in spleen (CFU‐S) in bone marrow 3 d after the administration. LC9018 stimulated the proliferation of M‐CFC but not that of GM‐CFC and CFU‐S. LC9018‐induced M‐CFC were similar to normal M‐CFC in dependence on macrophage colony‐stimulating factor (M‐CSF) and buoyant density. M‐CFC‐derived macrophages cultured in the presence of M‐CSF expressed Mac‐1 and Mac‐2 but not Mac‐3. They showed cytotoxic activity against syngenic tumor cells, Meth A, via direct contact, when assayed by using an in vitro colony inhibition assay or an in vivo Winn test. These results indicate that LC9018 stimulates the proliferation of cytotoxic macrophage progenitors in bone marrow and induces their differentiation in spleen. These effects may be one of the ways in which LC9018 suppresses tumor growth.