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Activation of neutrophils by recombinant interleukin 6.

Abstract：

:The cytokine interleukin 6 (IL-6) has been shown to have multiple biological activities against many cellular targets. The present studies were designed to determine whether these activities extended to the neutrophil (PMN). Initially, we investigated the ability of IL-6 to modulate PMN-mediated antibody-dependent cellular cytotoxicity. The presence of IL-6 stimulated 51Cr release from labeled, opsonized targets by 67.1% (from 21.6 +/- 1.4% to 36.1 +/- 1.3% at 10 U of IL-6 (P less than 0.01)). IL-6 was not directly toxic to the target cells and stimulation of ADCC was shown to occur across a range of effector-to-target ratios. To investigate the basis of the capacity of IL-6 to stimulate PMN, we studied the effects of IL-6 on PMN chemotaxis, degranulation, and the respiratory burst. IL-6 was not chemotactic or chemokinetic for PMN. However, IL-6 stimulated lysozyme secretion from 14.1 +/- 2.5 to 23.7 +/- 3.6% at 100 U (P less than 0.01). IL-6 was a complete secretagogue, being able to induce the secretion of both the secretory granule marker lactoferrin (11.2 +/- 2.0 to 23.5 +/- 2.2%) and the primary granule marker beta-glucuronidase (5.0 +/- 1.0 to 18.2 +/- 4.0%). IL-6 was not able to directly stimulate the PMN respiratory burst. However, IL-6 did "prime" PMN, enhancing superoxide secretion by fMLP (10(-7) M)-treated PMN by 50.8% (5.9 +/- 1.0 to 8.9 +/- 1.5 nmol superoxide at 100 U of IL-6; P less than 0.01) and PMA (5.0 nM) by 54.3% (8.1 +/- 2.6 to 12.5 +/- 3.6 nmol; P less than 0.05). In conclusion, IL-6 is a PMN stimulant, enhancing the toxicity of PMN in an antibody-dependent cellular cytotoxicity assay. Enhanced cytotoxicity may have been mediated, at least in part, by the stimulation of secretion of toxic components from PMN targets and by the priming of stimulating respiratory burst activity.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Borish L,Rosenbaum R,Albury L,Clark S

doi

10.1016/0008-8749(89)90026-9

subject

Has Abstract

pub_date

1989-07-01 00:00:00

pages

280-9

issue

2

eissn

0008-8749

issn

1090-2163

pii

0008-8749(89)90026-9

journal_volume

121

pub_type

杂志文章

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