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. 1975 Oct;12(4):813–820. doi: 10.1128/iai.12.4.813-820.1975

Fate of human lactoferrin and myeloperoxidase in phagocytizing human neutrophils: effects of immunoglobulin G subclasses and immune complexes coated on latex beads.

M S Leffell, J K Spitznagel
PMCID: PMC415361  PMID: 172446

Abstract

Human neutrophils (PMN) degranulated in response to soluble human immune complexes and to myeloma proteins, including subclasses of immunoglobulin G (IgG)1, IgG2, IgG3, and IgG4 coated on 1.09-mum latex beads. Immunochemical measurement of lactoferrin (LF) from specific granules and myeloperoxidas (MPO) from azurophil granules showed that both classes of granule degranulated. Beads with soluble complexes of human anti-pigeon IgG-normal pigeon IgG, prepared from serum of a patient with pigeon breeders disease, induced significantly greater degranulation than did pigeon IgG-coated beads. Up to 40% of LF in the PMN degranulated during phagocytic challenge and 86% of that entered the extracellular fluid. Twenty to 30% of the MPO degranulated, but less than 50% of that entered the extracellular fluid. The degranulated LF and MPO which remained in the PMN were recovered from phagocytic vacuoles. Beads coated with purified human myeloma proteins (12 different ones, three of each subclass) induced degranulation in the order IgG3 greater than IgG1 greater than IgG2 greater than IgG4; however, these differences were found to be a function of the amount of latex ingested. Thus, the amount of degranulation was dependent more on the opsonizing capacity of the immunoglobulins rather than on their intrinsic capacities for inducing degranulation. Degranulation of both LF and MPO in response to IgG subclasses followed patterns similar to those caused by soluble immune complexes, and IgG3 coated on beads caused degranulation equal to that caused by human complex-coated beads. Degranulation to IgG3 and IgG4 was uninfluenced by fresh compared with heat-inactivated human AB serum. This was true although IgG3 beads fixed greater than sixfold more complement than did IgG4 beads. Evidently human IgG subclasses enhance phagocytosis and degranulation of human PMN. The overwhelmingly extracellular degranulation of LF in response to various bead coating suggest that it subserves a major protion of it role outside PMN.

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Selected References

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