Non-genomic action of beclomethasone dipropionate on bronchoconstriction caused by leukotriene C4in precision cut lung slices in the horse

BMC Veterinary Research

Research Article

Frank Niedorf¹  Manfred Kietzmann¹  Ann-Kristin Barton²  Bernhard Ohnesorge²  Maria Fugazzola³ 

[1] Institute for Pharmacology, Pharmacy and Toxicology, University of Veterinary Sciences Hanover, Hanover, Germany;University of Veterinary Sciences Hanover, Clinic for Horses, Hanover, Germany;University of Veterinary Sciences Hanover, Clinic for Horses, Hanover, Germany;Institute for Pharmacology, Pharmacy and Toxicology, University of Veterinary Sciences Hanover, Hanover, Germany;

关键词: Beclomethasone;    Horse;    Leukotriene;    Non-genomic membrane receptors;    Recurrent airway obstruction;    RAO;    Precision-cut lung slices;    PCLS;   

DOI  :  10.1186/1746-6148-8-160

 received in 2011-11-29, accepted in 2012-08-13,  发布年份 2012

来源: Springer

【 摘 要 】

BackgroundGlucocorticoids have been proven to be effective in the therapy of recurrent airway obstruction (RAO) in horses via systemic as well as local (inhalative) administration. Elective analysis of the effects of this drug on bronchoconstriction in viable lung tissue offers an insight into the mechanism of action of the inflammatory cascade occurring during RAO which is still unclear. The mechanism of action of steroids in treatment of RAO is thought to be induced through classical genomic pathways. We aimed at electively studying the effects of the glucocorticoid beclomethasone dipropionate on equine precision-cut lung slices (PCLS).PCLS were used to analyze ex-vivo effects of beclomethasone on inhibiting bronchoconstriction in the horse. The inhibiting effect was measured through instillation of a known mediator of inflammation and bronchoconstriction, leukotriene C4. For this, the accessory lobes of 13 horses subjected to euthanasia for reasons unrelated to the respiratory apparatus were used to obtain viable lung slices.ResultsAfter 30 minutes of PCLS incubation, beclomethasone showed to significantly inhibit the contraction of the bronchioles after instillation with leukotriene C4. The EC50 values of the two contraction curves (LTC4 with and without BDP) differed significantly from each other (p = 0.002). The possibility of a non-genomic rapid mechanism of action seems likely since transcriptional activities require a longer lag period.ConclusionsIn human neuroendocrinology, high levels of glucocorticoids have been proven to function via a non-genomic mechanism of membrane receptors. The concentration of beclomethasone used on the lung slices in our study can be considered as high. This allows speculation about similar rapid non-genomic mechanisms of high-dosage inhaled glucocorticoids in the lower airways of horses. However, further assessment on a molecular basis is needed to confirm this.

【 授权许可】

CC BY   
© Fugazzola et al.; licensee BioMed Central Ltd. 2012