Enhancement of polymorphonuclear leukocyte (PMN) function by OK-432.
The influence of OK-432, a streptococcal preparation, on human polymorphonuclear leukocytes (PMN) was examined. OK-432 increased O2- generation was also observed when PMN were cultured with 10(-2)KE/ml OK-432 for 1 h and then stimulated with phorbol myristate acetate or formyl-metionyl-leucil-phenylalanine (FMLP). In addition, PMN O2- generation was promoted by culture supernatants of peripheral blood mononuclear cells (PBMC) incubated with 10(-3) or 10(-2) KE/ml OK-432. Furthermore, OK-432 (10(-3)-10(-2) KE/ml) enhanced the chemiluminescence of FMLP- and PMA-stimulated PMN. However, nitroblue tetrazolium reduction and myeloperoxidase activity were only minimally enhanced. Not only the candidacidal activity of PMN but also antibody-dependent cell-mediated cytotoxicity against Candida and Raji cells were enhanced in correspondence with the increased generation of reactive oxygen species. Culture of PMN or PBMC for 24 h with OK-432 resulted in a concentration-dependent increase in the substantial production of interleukin-1 beta, interleukin-6 and tumor necrosis factor-alpha. OK-432 also enhanced granulocyte-macrophage colony stimulating factor and gamma-interferon generation by leukocytes in a dose-dependent manner. Our research indicates that OK-432 enhances PMN function directly as well as via the promotion of cytokine production, and suggests that these effects of OK-432 could be beneficial in immunosuppressed patients.
Ueta
E
E
Department of Oral Surgery, Kochi Medical School, Japan.
Umazume
M
M
Yamamoto
T
T
Osaki
T
T
D002176:Candida albicans / Q000276:immunology; D002294:Carcinoma, Squamous Cell / Q000276:immunology / Q000378:metabolism / Q000628:therapy; D003131:Combined Modality Therapy; D016207:Cytokines / Q000096:biosynthesis; D003602:Cytotoxicity, Immunologic; D006801:Humans; D066298:In Vitro Techniques; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000276:immunology / Q000378:metabolism; D008163:Luminescent Measurements; D009062:Mouth Neoplasms / Q000276:immunology / Q000378:metabolism / Q000628:therapy; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D009504:Neutrophils / Q000187:drug effects / Q000276:immunology* / Q000378:metabolism; D009580:Nitroblue Tetrazolium / Q000378:metabolism; D010587:Phagocytosis; D010844:Picibanil / Q000494:pharmacology*; D013481:Superoxides / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
D016207:Cytokines; D013481:Superoxides; D009580:Nitroblue Tetrazolium; D010844:Picibanil; D009240:N-Formylmethionine Leucyl-Phenylalanine; D013755:Tetradecanoylphorbol Acetate