Summary
The contribution of monocyte cytotoxic protein factor (CF) to monocyte-mediated drug-dependent cellular cytotoxicity (DDCC) has been investigated. Cell lines which have been derived from murine WEHI 164 cells (termed WEHI 164 parental) by selecting for high (WEHI 164 clone 3) and low (R-WEHI 164) sensitivity to CF-mediated cytotoxicity were used as target cells in DDCC. By comparing the CF doses which produced 50% dead cells (LD 50) we found that WEHI 164 clone 3 was approximately 30 times more sensitive than WEHI 164 parental which in turn was 70 times more sensitive than R-WEHI 164. Actinomycin D (Act D) treatment of WEHI 164 parental and R-WEHI 164 greatly increase susceptibility to CF-mediated cytotoxicity. The susceptibility of WEHI 164 clone 3 was apparently somewhat increased at low dilutions of CF, whereas no significant increase was observed at high dilutions. The susceptibility to DDCC of the three target cell lines (WEHI 164 parental, WEHI 164 clone 3, and R-WEHI 164) correlated with the sensitivity pattern obtained in CF-mediated cytotoxicity of Act D-treated target cells. Monocyte- and CF-mediated cytotoxicity against Act D-treated WEHI 164 clone 3 and R-WEHI 164 was inhibited by neutralizing CF antiserum. These data indicate that CF is an effector molecule in monocyte-mediated DDCC.
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Austgulen, R., Kildahl-Andersen, O. & Espevik, T. Monocyte-mediated drug-dependent cellular cytotoxicity: effects on different WEHI 164 Target cell lines. Cancer Immunol Immunother 22, 176–180 (1986). https://doi.org/10.1007/BF00200029
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DOI: https://doi.org/10.1007/BF00200029