Anti-IL-8 autoantibody: IL-8 immune complexes suppress spontaneous apoptosis of neutrophils

Rafal Fudala, Agnieszka Krupa, Michael A. Matthay, Timothy C. Allen, Anna K. Kurdowska

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Our previous studies demonstrated that a significant fraction of interleukin-8 (IL-8) in lung fluids from patients with acute lung injury (ALI) and the acute respiratory distress syndrome (ARDS) is associated with anti-IL-8 autoantibodies (anti-IL-8:IL-8 immune complexes). Neutrophils have been implicated in the pathogenesis of ALI/ARDS, and moreover, it is wellestablished that apoptosis of neutrophils is delayed in patients with ALI/ARDS. The aim of this study was, therefore, to examine the role of anti-IL-8:IL-8 immune complexes in modulating spontaneous apoptosis of normal human neutrophils. Apoptosis was assessed by evaluating morphological changes, measuring enzymatic activity of caspase-3, and determining the extent of DNA degradation. We found that samples containing anti-IL-8:IL-8 immune complexes but not samples from which these complexes were removed inhibited neutrophil apoptosis. Furthermore, the former samples or effectively anti-IL-8:IL-8 complexes induced an increase in the level of antiapoptotic protein, Bcl-XL. In contrast, levels of proapoptotic proteins Bax and Bak were decreased in the same conditions. Activity of both caspase-3 and caspase-9 was also suppressed by anti-IL-8:IL-8 complex-containing samples. Finally, we established that IgG receptor, FcγRIIa, mediates antiapoptotic activity of anti-IL-8:IL-8 complexes and that the key components of the FcγRIIa signaling pathway, Src, Syk, PI3 kinase, and ERK, may be involved in regulation of neutrophil apoptosis by the complexes. These studies demonstrate for the first time that anti-IL-8:IL-8 immune complexes have the ability to prolong neutrophil life.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Volume293
Issue number2
DOIs
StatePublished - Aug 2007
Externally publishedYes

Fingerprint

Antigen-Antibody Complex
Interleukin-8
Autoantibodies
Neutrophils
Apoptosis
Acute Lung Injury
Adult Respiratory Distress Syndrome
Caspase 3
bcl-2 Homologous Antagonist-Killer Protein
bcl-X Protein
IgG Receptors
bcl-2-Associated X Protein
Caspase 9
Phosphatidylinositol 3-Kinases

Keywords

  • Acute lung injury
  • Autoantibody
  • Immune complex
  • Interleukin-8

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine
  • Cell Biology
  • Physiology

Cite this

Anti-IL-8 autoantibody : IL-8 immune complexes suppress spontaneous apoptosis of neutrophils. / Fudala, Rafal; Krupa, Agnieszka; Matthay, Michael A.; Allen, Timothy C.; Kurdowska, Anna K.

In: American Journal of Physiology - Lung Cellular and Molecular Physiology, Vol. 293, No. 2, 08.2007.

Research output: Contribution to journalArticle

Fudala, Rafal ; Krupa, Agnieszka ; Matthay, Michael A. ; Allen, Timothy C. ; Kurdowska, Anna K. / Anti-IL-8 autoantibody : IL-8 immune complexes suppress spontaneous apoptosis of neutrophils. In: American Journal of Physiology - Lung Cellular and Molecular Physiology. 2007 ; Vol. 293, No. 2.
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AB - Our previous studies demonstrated that a significant fraction of interleukin-8 (IL-8) in lung fluids from patients with acute lung injury (ALI) and the acute respiratory distress syndrome (ARDS) is associated with anti-IL-8 autoantibodies (anti-IL-8:IL-8 immune complexes). Neutrophils have been implicated in the pathogenesis of ALI/ARDS, and moreover, it is wellestablished that apoptosis of neutrophils is delayed in patients with ALI/ARDS. The aim of this study was, therefore, to examine the role of anti-IL-8:IL-8 immune complexes in modulating spontaneous apoptosis of normal human neutrophils. Apoptosis was assessed by evaluating morphological changes, measuring enzymatic activity of caspase-3, and determining the extent of DNA degradation. We found that samples containing anti-IL-8:IL-8 immune complexes but not samples from which these complexes were removed inhibited neutrophil apoptosis. Furthermore, the former samples or effectively anti-IL-8:IL-8 complexes induced an increase in the level of antiapoptotic protein, Bcl-XL. In contrast, levels of proapoptotic proteins Bax and Bak were decreased in the same conditions. Activity of both caspase-3 and caspase-9 was also suppressed by anti-IL-8:IL-8 complex-containing samples. Finally, we established that IgG receptor, FcγRIIa, mediates antiapoptotic activity of anti-IL-8:IL-8 complexes and that the key components of the FcγRIIa signaling pathway, Src, Syk, PI3 kinase, and ERK, may be involved in regulation of neutrophil apoptosis by the complexes. These studies demonstrate for the first time that anti-IL-8:IL-8 immune complexes have the ability to prolong neutrophil life.

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