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The aim of the present study was to obtain objective data on the morphology and quantitative information about other characteristics of murine macrophage-like cell lines J774.1, PU5-1.8, WEHI-3, and P388-D1, and to compare the findings with those in resident and exudate macrophages collected directly from mice. Fetal fibroblasts were included to serve as controls. Evaluation of the morphological data showed that the cell lines J774.1 and WEHI-3 are almost identical in most respects, that the cells of P388-D1 differ widely from both of the former lines, and that the morphometric parameters of cell line PU5-1.8 occupy an intermediate position. The cells of the P388-D1 line show the most similarity to resident and exudate macrophages, and cell lines J774.1 and WEHI-3 the least. Fetal fibroblasts had divergent values for all morphometric parameters. Good correspondence was found when the quantitative data obtained by morphometric analysis of the cells in question were compared with the morphological pictures. No gross differences as to cytochemical characteristics were found between the cells of the four cell lines, except for 5'-nucleotidase activity. The occurrence of IgG receptors and the ingestion of EIgG were also similar, but the percentage of cells with C3b receptors was much lower in two of the cell lines (WEHI-3 and P388-D1) and the level of EIgMC ingestion was very much higher in one (J774.1) compared with both the other cell lines and the resident and exudate macrophages. The ingestion of opsonized bacteria and latex varied widely within and between the cell lines. Quantitative data on the binding of monoclonal antibodies by the cells of the macrophage cell lines and the resident and exudate macrophages showed a wide variation. The doubling time of the cell lines is on average 1 day; distinct differences were found between these lines with respect to the lag-time of proliferation after replating. Cluster analysis and statistical analysis of morphological and other characteristics gave insight into the degree of resemblance between the cells of the four cell lines on the one hand and the resident and exudate macrophages on the other.
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