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Infection and Immunity, September 1998, p. 4087-4092, Vol. 66, No. 9
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

The Biphasic mRNA Expression Pattern of Bovine Interleukin-8 in Pasteurella haemolytica Lipopolysaccharide-Stimulated Alveolar Macrophages Is Primarily due to Tumor Necrosis Factor Alpha

Rhonda L. Lafleur, Mitchell S. Abrahamsen, and Samuel K. Maheswaran*

Department of Veterinary PathoBiology, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota 55108

Received 22 December 1997/Returned for modification 20 February 1998/Accepted 20 May 1998

Pasteurella haemolytica serotype 1 is the bacterial agent responsible for the pathophysiological events associated with bovine pneumonic pasteurellosis. Our previous studies support a role for the lipopolysaccharide (LPS) from P. haemolytica in the induction of proinflammatory cytokines. One of the pathological hallmarks of bovine pneumonic pasteurellosis is an influx of neutrophils into the alveolar spaces. This pronounced influx suggests the local production of a chemotactic factor(s) such as interleukin-8 (IL-8). In the context of the lung, the alveolar macrophage appears to be the major producer of IL-8, a proinflammatory cytokine with potent neutrophil chemotactic activity. By using Northern blot analysis, we have examined the kinetics of IL-8 mRNA expression in P. haemolytica LPS-stimulated bovine alveolar macrophages and found that 1 ng of LPS per ml induces maximal expression of IL-8 mRNA. The results also indicate a biphasic time course expression pattern in which IL-8 mRNA levels peak between 1 and 2 h in the first phase and between 16 and 24 h in the second phase (P < 0.01). In addition, monospecific polyclonal antibodies were used to demonstrate the role of tumor necrosis factor alpha (TNF-alpha ) in the second phase of IL-8 mRNA expression. Our findings support a role for P. haemolytica LPS and TNF-alpha in the induction of IL-8 from bovine alveolar macrophages.

* Corresponding author. Mailing address: Department of Veterinary PathoBiology, University of Minnesota, 1971 Commonwealth Ave., St. Paul, MN 55108. Phone: (612) 625-6264. Fax: (612) 624-4785. E-mail: mahes001{at}maroon.tc.umn.edu.

Infection and Immunity, September 1998, p. 4087-4092, Vol. 66, No. 9
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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