Production of cytotoxic factor into mouse peritoneal fluid by OK-432, a streptococcal preparation - PubMed (original) (raw)
Production of cytotoxic factor into mouse peritoneal fluid by OK-432, a streptococcal preparation
A Yamamoto et al. Immunol Lett. 1985.
Abstract
A cytotoxic factor was induced by the injection of LPS into the peritoneal fluids of mice which had been previously primed with a streptococcal antitumor preparation, OK-432. No cytotoxic effect on L-929 cells was observed in the peritoneal fluids of mice singly treated with OK-432 or LPS. Various mouse and human tumor cell lines were effectively killed by this peritoneal cytotoxic factor, though normal cell lines were insensitive, which indicates that this factor is not species-specific. The highest level of cytotoxic activity was obtained when LPS was given to mice 5 days after the injection of OK-432. The optimal time for collection of peritoneal fluids for the cytotoxic factor was 2 h following the LPS injection. Interferon activity was found to be negative by the plaque reduction test using L-929 cells with vesicular stomatitis virus. These results suggest that this cytotoxic factor is similar to the tumor necrosis factor (TNF) in the mouse serum.
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