Effects of PARP-1 deficiency on airway inflammatory cell recruitment in response to LPS or TNF: differential effects on CXCR2 ligands and Duffy antigen receptor for chemokines

• Published in: Journal of leukocyte biology Vol. 86; no. 6; pp. 1385 - 1392
• Main Authors: Zerfaoui, Mourad, Naura, Amarjit S., Errami, Youssef, Hans, Chetan P., Rezk, Bashir M., Park, Jiwon, Elsegeiny, Waleed, Kim, Hogyoung, Lord, Kevin, Kim, Jong G., Boulares, A. Hamid
• Format: Journal Article
• Language: English
• Published: England Society for Leukocyte Biology 01-12-2009; The Society for Leukocyte Biology
• Subjects: Animals; Cell Movement - drug effects; Cell Movement - genetics; Cell Movement - immunology; Chemokine CCL2 - genetics; Chemokine CCL2 - immunology; Chemokine CCL3 - genetics; Chemokine CCL3 - immunology; Chemokine CXCL2 - genetics; Chemokine CXCL2 - immunology; cytokines; Duffy Blood-Group System - genetics; Duffy Blood-Group System - immunology; Gene Expression Regulation - drug effects; Gene Expression Regulation - genetics; Gene Expression Regulation - immunology; inflammation; Inflammation - chemically induced; Inflammation - genetics; Inflammation - immunology; Inflammation, Extracellular Mediators, & Effector Molecules; lipopolysaccharide; Lipopolysaccharides - pharmacology; lung; Lung - immunology; Macrophages, Alveolar - immunology; Mice; Mice, Knockout; monocytes/macrophages; Neutrophil Infiltration - drug effects; Neutrophil Infiltration - genetics; Neutrophil Infiltration - immunology; neutrophils; Neutrophils - immunology; Poly (ADP-Ribose) Polymerase-1; Poly(ADP-ribose) Polymerases - genetics; Poly(ADP-ribose) Polymerases - immunology; Receptors, Cell Surface - agonists; Receptors, Cell Surface - genetics; Receptors, Cell Surface - immunology; Receptors, Interleukin-8B - agonists; Receptors, Interleukin-8B - genetics; Receptors, Interleukin-8B - immunology; Trachea - immunology; transgenic/knockout mice; Tumor Necrosis Factor-alpha - pharmacology
• ISSN: 0741-5400; 1938-3673
• DOI: 10.1189/jlb.0309183

Differential influences mediated by PARP‐1 on the balance of pro‐neutrophilic or pro‐macrophagic stimulatory factors may govern the nature of airway inflammation in response to different stimuli.
We reported that PARP‐1 exhibits differential roles in expression of inflammatory factors. Here, we show that PARP‐1 deletion was associated with a significant reduction in inflammatory cell recruitment to mouse airways upon intratracheal administration of LPS. However, PARP‐1 deletion exerted little effect in response to TNF exposure. LPS induced massive neutrophilia and moderate recruitment of macrophages, and TNF induced recruitment of primarily macrophages with smaller numbers of neutrophils in the lungs. Following either exposure, macrophage recruitment was blocked severely in PARP‐1−/− mice, and this was associated with a marked reduction in MCP‐1 and MIP‐1α. This association was corroborated partly by macrophage recruitment in response to intratracheal administration of MCP‐1 in PARP‐1−/− mice. Surprisingly, although neutrophil recruitment was reduced significantly in LPS‐treated PARP‐1−/− mice, neutrophil numbers increased in TNF‐treated mice, suggesting that PARP‐1 deletion may promote a macrophagic‐to‐neutrophilic shift in the inflammatory response upon TNF exposure. Neutrophil‐specific chemokines mKC and MIP‐2 were reduced significantly in lungs of LPS‐treated but only partially reduced in TNF‐treated PARP‐1−/− mice. Furthermore, the MIP‐2 antagonist abrogated the shift to a neutrophilic response in TNF‐exposed PARP‐1−/− mice. Although CXCR2 expression increased in response to either stimulus in PARP‐1+/+ mice, the DARC increased only in lungs of TNF‐treated PARP‐1+/+ mice; both receptors were reduced to basal levels in treated PARP‐1−/− mice. Our results show that the balance of pro‐neutrophilic or pro‐macrophagic stimulatory factors and the differential influence of PARP‐1 on these factors are critical determinants for the nature of the airway inflammatory response.