کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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3415560 | 1593652 | 2008 | 7 صفحه PDF | دانلود رایگان |
The objective of this study was to determine if inflammatory tolerance and enhancement of innate immune function could be induced by the Gram-positive cell wall component peptidoglycan (PGN). Male mice (C57BL6/J or C3H/HeJ, 8–12 weeks of age) were given intraperitoneal injections of 1 mg PGN on 2 consecutive days. The mice were then challenged with lipopolysaccharide (LPS) or live Pseudomonas aeruginosa (1 × 108 colony-forming units) 2 days after the second pretreatment. Mice pretreated with PGN had diminished plasma concentrations of TNFα and IFNγ and elevated concentrations of IL-10 in response to a subsequent LPS or Pseudomonas challenge when compared to untreated controls. Bacterial clearance was improved in mice pretreated with PGN, and mortality in response to a subsequent Pseudomonas challenge was significantly attenuated. PGN pretreatment of LPS-unresponsive mice (C3H/HeJ) verified that the effect of PGN pretreatment was not due to any LPS contamination. We have previously demonstrated that PGN pretreatment induced resistance to a Gram-positive bacterial challenge. The present study extends those results by showing that exposure to the Gram-positive bacterial cell wall component peptidoglycan also induces cross-tolerance to LPS and non-specifically enhances innate immune function in that PGN-pretreated mice had increased resistance to Gram-negative bacterial challenge.
Journal: Microbes and Infection - Volume 10, Issues 12–13, October 2008, Pages 1244–1250