Abstract
The effect of immunoglobulins and complement (C) on phagocytosis and intracellular killing of Escherichia coli was studied in vitro. The incubation system consisted of monolayers of human polymorphonuclear leukocytes and C-resistant, [3H]thymidine-labeled E. coli C source was human serum deprived of immunoglobulins and properdin by immunoabsorption. In the absence of C, only immunoglobulin G-coated bacteria were phagocytosed, whereas immunoglobulin M lacked opsonic activity. In the presence of C, phagocytosis was enhanced; however, immunoglobulin M was now more efficient than immunoglobulin G. Intracellular killing was notably augmented when C was activated by immunoglobulin G- or immunoglobulin M-coated bacteria; in contrast, the alternative activation of C by properdin had no effect on phagocytosis or intracellular killing. These results demonstrate the importance of immunoglobulins together with C not only for phagocytosis but also for efficient intracellular killing.
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