Summary
Established melanoma cell lines were cultured for one passage (approximately 1 week) in different lots of fetal calf and new born calf sera and then tested against a panel of previously positively reacting sera from melanoma patients and polyspecific HL-A alloantisera. Using indirect immunofluorescence the cells showed varying degrees of reactivity ranging from positive to negative reactions depending on the supplementing serum in the culture medium. When standardized culture conditions were used and the cells were tested by immune adherence at several weeks intervals against panels of sera from melanoma patients, from tumor patients other than melanoma, from pregnant women, and from normal donors, most of the sera reacted identical, but some sera not only had changed quantitatively but also qualitatively from a negative to a positive reaction and vice versa indicating a shift in the spectrum of expressed antigens. When single cell clones from a cell line were isolated and tested against a panel of antisera, striking differences in reactivity were observed suggesting that the shift in the spectrum of expressed antigens was due to the outgrowth of dominating subclones with antigen patterns different from the previously dominating subclones. This conclusion was further supported by experiments in which a weakly positive reacting serum was employed to separate a cell line into positively and negatively reacting sublines. Unit gravity sedimentation and density gradient sedimentation were used in order to separate rosetted from non-rosetted tumor cells which had been prepared by immune adherence. It is concluded that cultured cell lines are in a dynamic state and that differentiation is one of the major mechanisms accounting for a change in antigen expression.
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Sorg, C., Brüggen, J., Seibert, E. et al. Membrane-associated antigens of human malignant melanoma IV: Changes in expression of antigens on cultured melanoma cells. Cancer Immunol Immunother 3, 259–271 (1978). https://doi.org/10.1007/BF00200080
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DOI: https://doi.org/10.1007/BF00200080