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- W2023882776 abstract "In the present study we investigated the effect of OK-432, a streptococcus preparation, on the contact-mediated inhibition of human NK activity by primary cultures of monolayer cells. Either peripheral blood lymphocytes (PBL) or large granular lymphocytes (LGL) were incubated (2×10 6 cells/ml, total volume 2 ml) on confluent monolayer cells (uvea-derived fibroblasts, uvea-derived melanoma cells, or renal carcinoma cells) for 18 h in 24-well plates, washed twice, and tested for cytotoxicity against K562, a human myelogeneous leukemia cell line, in a 4 h 51 Cr-release assay. After contact with monolayer cells, NK activity of both PBL and LGL was significantly reduced. When these effector cells were preincubated with 0.1 U/ml of OK-432 for 18 h and then tested for the sensitivity to contact-mediated inhibition, the inhibition was significantly reduced. The pretreatment of monolayer cells with OK-432 or the addition of OK-432 into the co-culture wells (of effector cells and monolayer cells) also significantly reduced the contact-mediated inhibition. Moreover, OK-432 (0.1 U/ml) reestablished the inhibited NK activity of PBL. These results suggest that OK-432 might enable NK cells to escape from the contact-mediated inhibition by monolayer cells and thus provide an additional potential mechanism for the observed clinical effectiveness of OK-432 reported by many groups." @default.
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- W2023882776 date "1990-09-01" @default.
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- W2023882776 title "Reduction by OK-432 of the monolayer contact-mediated inhibition of human natural killer cell activity" @default.
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- W2023882776 doi "https://doi.org/10.1016/0165-2478(90)90206-6" @default.
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