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Am. J. Respir. Crit. Care Med., Volume 160, Number 6, December 1999, 2040-2047

IL-10 Attenuates Excessive Inflammation in Chronic Pseudomonas Infection in Mice

JAMES F. CHMIEL, MICHAEL W. KONSTAN, JEANNE E. KNESEBECK, JAY B. HILLIARD, TRACEY L. BONFIELD, DEBORAH V. DAWSON, and MELVIN BERGER

Department of Pediatrics, Rainbow Babies and Children's Hospital and Department of Epidemiology and Biostatistics, MetroHealth Medical Center, Case Western Reserve University, Cleveland, Ohio

Cystic fibrosis (CF) lung disease is characterized by an excessive inflammatory response associated with chronic Pseudomonas aeruginosa endobronchial infection. Compared with bronchoalveolar lavage fluid from healthy subjects, lavage fluid from patients with CF contains elevated proinflammatory cytokines but negligible amounts of the anti-inflammatory cytokine interleukin-10 (IL-10). We sought to determine whether IL-10 deficiency results in increased local and systemic morbidity in mice with chronic endobronchial infection with P. aeruginosa embedded in agar beads and to determine if exogenous IL-10 might reduce these effects. Infected IL-10 knockout mice had more severe weight loss (p = 0.04) and increased area of lung inflammation (28 ± 4 versus 10 ± 2%, p < 0.002) but no alterations in bacterial burden compared with wild-type mice. Infected CD-1 mice treated with IL-10 had improved survival (p = 0.035), less severe weight loss (p < 0.005), fewer bronchoalveolar lavage neutrophils (3 × 105/ml versus 5 × 106/ml, p < 0.02), and decreased area of lung inflammation (11 ± 2 versus 35 ± 7%, p < 0.01) but no alterations in bacterial burden compared with placebo-treated mice. These data suggest that IL-10 is an important regulator of the inflammatory response to P. aeruginosa endobronchial infection and that further investigation into the use of IL-10 in CF is warranted. Chmiel JF, Konstan MW, Knesebeck JE, Hilliard JB, Bonfield TL, Dawson DV, Berger M. IL-10 attenuates excessive inflammation in chronic Pseudomonas infection in mice.




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