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Airway epithelial MyD88 restores control of Pseudomonas aeruginosa murine infection via an IL-1-dependent pathway.


ABSTRACT: The opportunistic human pathogen Pseudomonas aeruginosa causes rapidly progressive and tissue-destructive infections, such as hospital-acquired and ventilator-associated pneumonias. Innate immune responses are critical in controlling P. aeruginosa in the mammalian lung, as demonstrated by the increased susceptibility of MyD88(-/-) mice to this pathogen. Experiments conducted using bone marrow chimeric mice demonstrated that radio-resistant cells participated in initiating MyD88-dependent innate immune responses to P. aeruginosa. In this study we used a novel transgenic mouse model to demonstrate that MyD88 expression by epithelial cells is sufficient to generate a rapid and protective innate immune response following intranasal infection with P. aeruginosa. MyD88 functions as an adaptor for many TLRs. However, mice in which multiple TLR pathways (e.g., TLR2/TLR4/TLR5) are blocked are not as compromised in their response to P. aeruginosa as mice lacking MyD88. We demonstrate that IL-1R signaling is an essential element of MyD88-dependent epithelial cell responses to P. aeruginosa infection.

SUBMITTER: Mijares LA 

PROVIDER: S-EPMC3110630 | biostudies-other | 2011 Jun

REPOSITORIES: biostudies-other

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Airway epithelial MyD88 restores control of Pseudomonas aeruginosa murine infection via an IL-1-dependent pathway.

Mijares Lilia A LA   Wangdi Tamding T   Sokol Caroline C   Homer Robert R   Medzhitov Ruslan R   Kazmierczak Barbara I BI  

Journal of immunology (Baltimore, Md. : 1950) 20110513 12


The opportunistic human pathogen Pseudomonas aeruginosa causes rapidly progressive and tissue-destructive infections, such as hospital-acquired and ventilator-associated pneumonias. Innate immune responses are critical in controlling P. aeruginosa in the mammalian lung, as demonstrated by the increased susceptibility of MyD88(-/-) mice to this pathogen. Experiments conducted using bone marrow chimeric mice demonstrated that radio-resistant cells participated in initiating MyD88-dependent innate  ...[more]

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