title: Antitumor mechanisms of Eubacterium lentum and its components.
abstract: In the present study, some antitumor mechanisms of Eubacterium lentum (TYH-11) and bacterial components having antitumor effects were investigated. E.lentum induced maximum NK cell activity in C3H/He mice on day 1 after injection (90.6% against 33.9% of control at E:T ratio 50:1) and the activity was kept at a level of 48.6% on day 7. Tumoricidal peritoneal macrophages were induced 9 days after E.lentum injection into BALB/c mice (56.2% against 10.1% control at E:T ratio 10:1). Tumoricidal macrophage activity persisted at the same level for at least 11 days. Cytotoxic T lymphocyte (CTL) activity was induced only in tumor bearing mice treated with E.lentum, 4 weeks after tumor inoculation. Antitumor activity was observed in the cell wall (CW) and membrane fractions (CM) of E.lentum. CW induced NK cell activity; the activity was transient while the kinetics of NK activity by CM showed 2 peaks, on day 1 and day 7. Tumoricidal macrophages were induced by CW and the activity level was the same as that induced by whole body, while that induced by CM was at a lower level. Neither CW nor CM induced CTL in tumor bearing mice.
authors.affiliation: Department of Medical Microbiology, Faculty of Medicine, Hasanuddin University, South Sulawesi, Indonesia.
authors.forename: M
authors.initials: M
authors.lastname: Hatta
mesh_terms: D000276:Adjuvants, Immunologic / Q000494:pharmacology*; D000818:Animals; D000970:Antineoplastic Agents; D003602:Cytotoxicity, Immunologic; D005051:Eubacterium / Q000276:immunology*; D007694:Killer Cells, Natural / Q000276:immunology*; D017737:Macrophages, Peritoneal / Q000276:immunology*; D008297:Male; D051379:Mice; D012692:Serial Passage; D014407:Tumor Cells, Cultured / Q000276:immunology
chemical_list: D000276:Adjuvants, Immunologic; D000970:Antineoplastic Agents