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Science 18 October 1991:
Vol. 254. no. 5030, pp. 430 - 432
DOI: 10.1126/science.1833820
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Articles

Science, Vol 254, Issue 5030, 430-432
Copyright © 1991 by American Association for the Advancement of Science

articles

Enhancement of growth of virulent strains of Escherichia coli by interleukin-1

R Porat, BD Clark, SM Wolff, and CA Dinarello

Department of Medicine, Tufts University, New England Medical Center Hospitals, Boston, MA 02111.

Interleukin-1 (IL-1) is a polypeptide cytokine that mediates many physiological responses to infection and inflammation and is a growth factor for certain mammalian cells. Virulent and avirulent clinical isolates of Escherichia coli were grown in culture media in the presence of human IL-1. IL-1 beta, but not tumor necrosis factor or IL-4, enhanced the growth of virulent, but not avirulent, E. coli. This enhancement was blocked by the IL-1 receptor antagonist (IL-1ra). Radiolabeled IL-1 bound to virulent but not avirulent E. coli in a specific and saturable fashion; IL-1ra inhibited this binding. Thus, human IL-1 may recognize a functional IL-1-like receptor structure on virulent E. coli and may be a virulence factor for bacterial pathogenicity.


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