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Phagocytic capacity of cytokineplasts from human blood polymorphonuclear leukocytes.

Cytokineplasts (CKP) are membrane-bounded anucleate cytoplasmic fragments, induced from polymorphonuclear leukocytes (PMN) by the brief application of heat; derived from the cortical cytoplasm that gathers at the leading front of migrating PMN; and endowed with many of the motile properties of the parent cell. In this study we examine their phagocytic capacity by quantitative methods. CKP ingest Staphylococcus aureus and Serratia marcescens somewhat less avidly than do the corresponding intact PMN, yet rather impressively when one considers how restricted a portion of the parent cell they represent. Under the conditions employed, CKP killed about half as many of the bacteria presented to them as did their parent PMN. Thus, despite a heat-associated loss of demonstrable respiratory burst oxidase activity and a paucity of cytoplasmic granules, the organelle-depleted CKP deals with bacteria in a way that mimics its parent PMN.