Interleukin-8 gene expression by a pulmonary epithelial cell line. A model for cytokine networks in the lung - PubMed (original) (raw)

Interleukin-8 gene expression by a pulmonary epithelial cell line. A model for cytokine networks in the lung

T J Standiford et al. J Clin Invest. 1990 Dec.

Abstract

Cellular constituents of the alveolar-capillary wall may be key participants in the recruitment of polymorphonuclear leukocytes to the lung through the generation of the novel neutrophil chemotactic peptide interleukin-8 (IL-8). This interaction appears to occur via the ability of human alveolar macrophage (AM)-derived monokines, tumor necrosis factor (TNF), and interleukin-1 (IL-1) to induce gene expression of IL-8 from pulmonary type II-like epithelial cells (A549). Northern blot analysis demonstrated that steady-state IL-8 mRNA expression, by either TNF- or IL-1 beta-treated A549 cells, occurred in both a dose- and time-dependent fashion. Similarly, extracellular antigenic IL-8, as assessed by specific ELISA, was expressed from TNF- or IL-1 beta-stimulated epithelial cells in a time-dependent fashion with maximal IL-8 antigen detected at 24 h poststimulation. Immunohistochemical staining utilizing rabbit anti-human IL-8 antibody identified immunoreactive, cell-associated IL-8 antigen as early as 8 h post-TNF or IL-1 beta stimulation. A549-generated neutrophil chemotactic bioactivity paralleled IL-8 steady-state mRNA levels. Signal specificity was demonstrated in this system as IL-8 mRNA or protein expression by lipopolysaccharide (LPS)-treated A549 cells was not different from unstimulated cells. Although LPS did not serve as a direct stimulus for the production of IL-8 by type II-like epithelial cells, the condition media from LPS-challenged AM induced a significant expression of IL-8 mRNA by the A549 cells. 24-h conditioned media from LPS-treated cells was as potent as either IL-1 beta or TNF in generating steady-state IL-8 mRNA by A549 cells. Preincubation of LPS-treated AM-conditioned media with anti-human TNF or IL-1 beta neutralizing antibodies resulted in significant abrogation of IL-8 gene expression by A549 pulmonary epithelial cells. These findings demonstrate potential cell-to-cell communication circuits that may be important between AMs and pulmonary epithelial cells during the recruitment phase of acute lung inflammation.

PubMed Disclaimer

References

    1. Int J Cancer. 1976 Jan 15;17(1):62-70 - PubMed
    1. Am J Respir Cell Mol Biol. 1989 Dec;1(6):479-87 - PubMed
    1. Biochemistry. 1979 Nov 27;18(24):5294-9 - PubMed
    1. J Clin Invest. 1980 Feb;65(2):268-76 - PubMed
    1. J Appl Physiol Respir Environ Exerc Physiol. 1979 Dec;47(6):1315-24 - PubMed

Publication types

MeSH terms

Substances

LinkOut - more resources