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. 1978 Dec;22(3):945–955. doi: 10.1128/iai.22.3.945-955.1978

Bactericidal capacity of phorbol myristate acetate-treated human polymorphonuclear leukocytes.

P Wang-Iverson, K B Pryzwansky, J K Spitznagel, M H Cooney
PMCID: PMC422247  PMID: 730386

Abstract

Thus far, the functional capacity of phorbol myristate acetate- (PMA)-treated human polymorphonuclear leukocytes has been undefined. PMA induced exocytosis of lactoferrin, the specific granule marker, but not of myeloperoxidase, the azurophil granule marker. This phenomenon was demonstrated both biochemically and with fluorescent antibody conjugates. PMA-treated neutrophils contained virtually no specific granules when viewed by electron microscopy. Separation of the granule classes by linear sucrose density gradient centrifugation revealed the loss, from PMA-treated neutrophils, of lactoferrin and the specific granule (D20(20) = 1.89) band usually resolved from normal neutrophils. Cells treated with PMA appeared to retain those functions normally associated with intraleukocytic microbicidal action. The hexose monophosphate shunt activated by phagocytic challenge was present in PMA-treated neutrophils. As demonstrated by electron microscopy, the azurophil granules of these cells appeared intact, and they retained the capacity for degranulation with translocation of myeloperoxidase to the site of phagocytized Escherichia coli. The PMA-treated neutrophils also remained capable of degrading the ingested microorganisms. PMA-treated neutrophils exhibited a decrease in phagocytic ability at all levels of bacterial challenge. In the presence of a high multiplicity of bacteria they demonstrated an impairment in killing. These same cells were able to kill low multiplicities of E. coli as well as control cells. It thus appeared that the loss of the specific granules, plus other undefined PMA-induced alterations, impaired neither the viability of these neutrophils nor their killing ability in the presence of a modest phagocytic challenge.

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Selected References

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