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- W2397599331 abstract "U937 cells are known to be relatively sensitive to C-mediated killing and have been reported to show variable expression of CD59. We have obtained stable CD59+ and CD59- sublines of the U937 cell line. Expression of other C-regulatory proteins, decay-accelerating factor (DAF), MCP and CR1, was similar on both cell lines. Although the sublines were morphologically similar and expressed similar amounts of most surface antigens, qualitative difference in expression of CD13 and CD64 and a quantitative difference in CD15 expression was observed. Sensitivity to C-mediated killing of the cell lines was measured using classical pathway activation. Both cell lines appeared to be equally sensitive to C-mediated killing. Monoclonal antibodies against CD59, which neutralize CD59 and enhance killing of most cell lines (including K562, HL60 and Molt4), did not enhance the killing of the CD59- cells but, surprisingly, also did not enhance killing of the CD59+ U937 subline. CD59 was expressed on the U937 subline at similar levels to that on HL60 and K562 cells, was glycosylphosphatidylinositol (GPI) anchored and could be immunoprecipitated from cell extracts. However, unlike these other cell lines, U937 cell extracts were negative in a Western blot using a variety of anti-CD59 antibodies even when ultrasensitive detection methods were used. These results indicate that the CD59+ U937 cell expresses a form of CD59 which is dysfunctional and structurally abnormal." @default.
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- W2397599331 date "1994-04-01" @default.
- W2397599331 modified "2023-10-18" @default.
- W2397599331 title "Presence of a dysfunctional form of CD59 on a CD59+ subclone of the U937 cell line." @default.
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