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Infect Immun. 1992 April; 60(4): 1295-1301

Interleukin-6 response of epithelial cell lines to bacterial stimulation in vitro.

S Hedges, M Svensson and C Svanborg

Department of Clinical Immunology, University of Lund, Sweden.

ABSTRACT

This study demonstrated that epithelial cell lines secrete interleukin-6 (IL-6) in response to stimulation with gram-negative bacteria. Human epithelial cell lines of urinary tract origin (A-498 and J82) and of intestinal origin (HT-29 and Caco-2) were analyzed for the secretion of IL-6 by using the B9 bioassay. The supernatants from cells maintained with culture medium were used to assess the constitutive production of IL-6. The supernatants from cells exposed to Escherichia coli strains, lipopolysaccharide, lipid A, and isolated fimbriae were used to quantitate the IL-6 response to these stimulants. The urinary tract epithelial cell lines were found to constitutively secrete IL-6. The IL-6 activity in the supernatants of the bladder cell line (J82) increased above constitutive levels after 2 h of stimulation by most of the bacterial strains tested. The IL-6 activity in the supernatants of the kidney line (A-498) accumulated at a constant rate over the 24-h assay period. The role of bacterial adherence for the induction of IL-6 production was investigated by comparing the responses to recombinant E. coli strains expressing different fimbriae. In addition, isolated P and S fimbriae with and without the receptor binding domain were also used as stimulants. The IL-6 activity in the supernatants of the bladder cell line increased after exposure to bacteria and bacterial products regardless of their adhesive properties. In contrast, the kidney cell line was stimulated to secrete significantly more IL-6 by adhering bacteria and by adhesin-positive P fimbriae than by nonadhering bacteria or adhesin-negative P fimbriae. The S-fimbrial preparations had no specific effects on the IL-6 activity of the cell supernatants. These results are consistent with our hypothesis that epithelial cells can be a major source of IL-6 when stimulated by bacteria and that the adhesive properties of the bacteria can influence this response.

Infect Immun. 1992 April; 60(4): 1295-1301




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