Abstract
An in vitro model for studying host cell interactions with Nocardia asteroides was developed. Thus, macrophage cell lines J774A.1 and P388D1, pulmonary artery endothelium cell line CPAE, rat glial tumor cell line C6, and human astrocytoma cell lines CCF-STTG1 and U-373 MG were infected with either log- or stationary-phase cells of N. asteroides GUH-2, and the host cell-nocardia interactions were determined by light microscopy and electron microscopy. Polyclonal antinocardial antibody did not enhance uptake of nocardiae by any of these cell lines; however, log-phase cells of GUH-2 infected a higher percentage of J774A.1 and P388D1 than did stationary-phase organisms. When cells infected with stationary-phase GUH-2 were incubated for 6 h, filaments developed, which indicated that nocardial growth had occurred. In J774A.1 and P388D1, only 31 to 57% of the total stationary-phase coccobacillary cells that were phagocytized formed filaments within 6 h. This indicated that there was some inhibition of growth of the phagocytized nocardiae within these macrophage cell lines; however, the nocardiae grew within the endothelial (> 87% filaments) and astrocytoma (100% filaments) cell lines. Microfilament inhibitor cytochalasin B inhibited uptake of GUH-2 by macrophages and other cell lines, except that there was no effect on uptake of nocardial cells by astrocytoma cell line U-373 MG. Scanning and transmission electron microscopy showed phagocytosis of GUH-2 by the different cell lines. In cytochalasin B-treated cells, nocardiae were shown to penetrate through the cell surface and become internalized in a manner distinct from typical phagocytosis, suggesting that filamentous forms of this organism have a phagocytosis-independent invasion factor. The extent of this cytochalasin-resistant cellular penetration by the nocardiae differed in the different cell lines.
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