Role of CXCL5 in Leukocyte Recruitment to the Lungs during Secondhand Smoke Exposure

被引:47
作者
Balamayooran, Gayathriy [1 ,2 ]
Batra, Sanjay [1 ,2 ]
Cai, Shanshan [1 ,2 ]
Mei, Junjie [4 ]
Worthen, G. Scott [5 ]
Penn, Arthur L. [3 ]
Jeyaseelan, Samithamby [1 ,2 ,6 ]
机构
[1] Louisiana State Univ, Dept Pathobiol Sci, Lab Lung Biol, Baton Rouge, LA 70803 USA
[2] Louisiana State Univ, Ctr Expt Infect Dis, Baton Rouge, LA 70803 USA
[3] Louisiana State Univ, Dept Comparat Biomed Sci, Baton Rouge, LA 70803 USA
[4] Childrens Hosp Philadelphia, Div Neonatol, Philadelphia, PA 19104 USA
[5] Univ Penn, Penn Cardiovasc Res Inst, Philadelphia, PA 19104 USA
[6] Louisiana State Univ, Sect Pulm & Crit Care Med, Dept Med, Hlth Sci Ctr, New Orleans, LA USA
基金
美国国家卫生研究院;
关键词
smoke; CXCL5/LIX; macrophages; chemokines; cytokines; OBSTRUCTIVE PULMONARY-DISEASE; NECROSIS-FACTOR-ALPHA; ESCHERICHIA-COLI PNEUMONIA; NF-KAPPA-B; INNATE IMMUNE-RESPONSES; CIGARETTE-SMOKE; TOBACCO-SMOKE; INDUCED EMPHYSEMA; INDUCED INFLAMMATION; HOST-DEFENSE;
D O I
10.1165/rcmb.2011-0260OC
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Chronic obstructive pulmonary disease (COPD) is the third leading cause of mortality in the United States. The major cause of COPD is cigarette smoking. Extensive leukocyte influx into the lungs, mediated by chemokines, is a critical event leading to COPD. Although both resident and myeloid cells secrete chemokines in response to inflammatory stimuli, little is known about the role of epithelial-derived chemokines, such as CXC chemokine ligand (CXCL)5, in the pathogenesis of cigarette smoke-induced inflammation. To explore the role of CXCL5, we generated CXCL5 gene-deficient mice and exposed them to secondhand smoke (SHS) for 5 hours/day for 5 days/week up to 3 weeks (subacute exposure). We observed a reduced recruitment of leukocytes to the lungs of CXCL5(-/-) mice compared with their wild-type (WT) counterparts, and noted that macrophages comprised the predominant leukocytes recruited to the lungs. Irradiation experiments performed on CXCL5(-/-) or WT mice transplanted with WT or CXCL5(-/-) bone marrow revealed that resident but not hematopoietic cell-driven CXCL5 is important for mediating SHS-induced lung inflammation. Interestingly, we observed a significant reduction of monocyte chemotactic protein-1 (MCP-1/CC chemokine ligand 2) concentrations in the lungs of CXCL5(-/-) mice. The instillation of recombinant MCP-1 in CXCL5(-/-) mice reversed macrophage recruitment. Our results also show the reduced activation of NF-kappa B/p65 in the lungs, as well as the attenuated activation of C-Jun N-terminal kinase, p42/44, and p38 mitogen-activated protein kinases and the expression of intercellular adhesion molecule-1 in the lungs of SHS-exposed CXCL5(-/-) mice. Our findings suggest an important role for CXCL5 in augmenting leukocyte recruitment in SHS-induced lung inflammation, and provide novel insights into CXCL5-driven pathogenesis.
引用
收藏
页码:104 / 111
页数:8
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