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Erschienen in: Inflammation Research 12/2012

01.12.2012 | Original Research Paper

Corticosteroid administration reduces the concentration of hyaluronan in bronchoalveolar lavage in a murine model of eosinophilic airway inflammation

verfasst von: Glenda Ernst, Silvina Lompardía, Rosalía Cordo Russo, Virginia Gentilini, Stella Venturiello, Fernando Galíndez, Pedro Grynblat, Silvia E. Hajos

Erschienen in: Inflammation Research | Ausgabe 12/2012

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Abstract

Objective

To analyze the effect of corticosteroid administration on the concentration of hyaluronan (HA) in bronchoalveolar lavage (BAL) in a murine model of eosinophilic airway inflammation and to study the mechanisms involved.

Materials and methods

Untreated-mice or mice treated with 1 μg/g/day betamethasone (Bm) or 0.25 μg/g/day−1 budesonide (Bd) were sensitized and challenged with Dermatophagoides pteronyssinus (Dp) or saline (control group). The concentration of HA in BAL was determined by ELISA. In vitro migration assays were performed using a Boyden chamber and the expression of HA synthases (HAS) was analyzed by RT-PCR.

Results

We found a significant increase (P < 0.01) in the levels of HA in BAL from Dp-treated mice that was prevented by Bm or Bd. Corticosteroids also inhibited the increase in HAS expression, and the phosphorylation of Akt and ERK in the lungs of challenged mice. Finally, we found that low molecular weight HA induces the chemotaxis of BAL cells in vitro through a mechanism mediated by CD44.

Conclusion

We conclude that corticosteroids prevent the increase in HA in BAL from Dp-challenged mice. This effect is associated with reduced expression of HAS and reduced phosphorylation of Akt and ERK in the lungs of challenged mice.
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Metadaten
Titel
Corticosteroid administration reduces the concentration of hyaluronan in bronchoalveolar lavage in a murine model of eosinophilic airway inflammation
verfasst von
Glenda Ernst
Silvina Lompardía
Rosalía Cordo Russo
Virginia Gentilini
Stella Venturiello
Fernando Galíndez
Pedro Grynblat
Silvia E. Hajos
Publikationsdatum
01.12.2012
Verlag
SP Birkhäuser Verlag Basel
Erschienen in
Inflammation Research / Ausgabe 12/2012
Print ISSN: 1023-3830
Elektronische ISSN: 1420-908X
DOI
https://doi.org/10.1007/s00011-012-0530-y

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