Interleukin-10 inhibits proinflammatory chemokine release by neutrophils of the newborn without suppression of nuclear factor-kappa B.

Abstract:

:An increase in polymorphonuclear leukocytes (PMNs) and proinflammatory chemokines, such as IL-8 and macrophage inflammatory protein-1 alpha (MIP), are found in the airways during early stages of bronchopulmonary dysplasia. We determined whether IL-10 produces a dose-related inhibition of proinflammatory chemokine release from stimulated neutrophils of the newborn and whether the mechanism involves the pivotal transcription factor, nuclear factor-kappa B. PMNs isolated from the cord blood of healthy newborns were stimulated submaximally with either lipopolysaccharide (n = 5) or tumor necrosis factor (n = 4), with and without IL-10 (0.01-1000 ng/mL). IL-8 and MIP release were measured in cell culture supernatants at 18 h. The presence or absence of nuclear factor-kappa B activity and inhibitor-kappa B alpha degradation was measured at 30 min and 3 h after PMN stimulation began. During lipopolysaccharide stimulation, IL-10 significantly reduced IL-8 levels from 50 +/- 16 ng/mL to 7 +/- 3 ng/mL, and MIP levels from 14 +/- 5 to 0.7 +/- 0.1 ng/mL (mean +/- SEM, p < 0.01). IL-10 produced an insignificant reduction in IL-8 and MIP levels after stimulation of PMNs with tumor necrosis factor. IL-10 did not inhibit nuclear factor-kappa B activation and inhibitor-kappa B alpha degradation in PMNs stimulated with tumor necrosis factor or lipopolysaccharide for 30 min. After PMN stimulation for 3 h, inhibitor-kappa B alpha cytoplasmic levels were restored; however, they were unaffected by IL-10. We conclude that IL-10 is a potent inhibitor of lipopolysaccharide-stimulated release of IL-8 and MIP from neutrophils of the newborn via a mechanism not involving nuclear factor-kappa B activity. Further work is needed to determine whether exogenous IL-10 may be useful for suppressing inflammation in bronchopulmonary dysplasia.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Tryzmel J,Miskolci V,Castro-Alcaraz S,Vancurova I,Davidson D

doi

10.1203/01.PDR.0000077471.36217.6E

subject

Has Abstract

pub_date

2003-09-01 00:00:00

pages

382-6

issue

3

eissn

0031-3998

issn

1530-0447

pii

01.PDR.0000077471.36217.6E

journal_volume

54

pub_type

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