Pierre Massion
Faculty Member
Last active: 1/11/2018

Pseudomonas stimulates interleukin-8 mRNA expression selectively in airway epithelium, in gland ducts, and in recruited neutrophils.

Inoue H, Massion PP, Ueki IF, Grattan KM, Hara M, Dohrman AF, Chan B, Lausier JA, Golden JA, Nadel JA
Am J Respir Cell Mol Biol. 1994 11 (6): 651-63

PMID: 7946394 · DOI:10.1165/ajrcmb.11.6.7946394

Neutrophils may play important roles in chronic airway diseases. Pseudomonas is a common pathogen in some chronic airway diseases, and expression of the neutrophil chemoattractant interleukin-8 (IL-8) is induced by Pseudomonas in various cells in vitro. Here we examine the localization of IL-8 mRNA expression after incubating human and dog bronchi with Pseudomonas supernatant in vitro. To examine IL-8 expression in recruited neutrophils, we also superfused the dog bypassed tracheal segment with Pseudomonas supernatant in vivo and measured neutrophil number and IL-8 concentration in luminal fluid; simultaneously, we introduced Pseudomonas supernatant by catheter in a peripheral airway. After 6 h, we analyzed IL-8 mRNA expression and localization in removed tissue. Unincubated bronchi showed no IL-8 mRNA expression, but incubation with Pseudomonas supernatant in vitro resulted in IL-8 mRNA expression in surface epithelial, gland duct, and a subpopulation of serous gland cells. In vivo, introduction of Pseudomonas supernatant into dog trachea and peripheral airways caused IL-8 mRNA expression in epithelial and gland duct cells but also in the recruited neutrophils. Pseudomonas lipopolysaccharide alone was without effect in vitro and in vivo. We conclude that Pseudomonas products, but not lipopolysaccharide, stimulate IL-8 expression in airways and that this expression occurs primarily in surface epithelial and gland duct cells, thus bringing the chemoattractant to the bacterial site. Furthermore, IL-8 expression in recruited neutrophils provides a potential mechanism for positive feedback of this protective antibacterial response.

MeSH Terms (22)

Adult Animals Base Sequence Bronchi Cells, Cultured Child Culture Techniques Dogs Epithelial Cells Exocrine Glands Gene Expression Regulation Humans Interleukin-8 Lipopolysaccharides Middle Aged Molecular Sequence Data Mucous Membrane Neutrophils Pseudomonas aeruginosa RNA, Messenger Trachea Tumor Necrosis Factor-alpha

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