Oliveira MSS, de O Barreto E, Zamuner S, Pires ALA, Ferreira TPT, Cordeiro RSB, Lagente V, Martins MA, Wallace JL, e Silva PMR. Suppressive effects of nitric oxide-releasing prednisolone NCX-1015 on the allergic pleural eosinophil recruitment in rats.
Clin Exp Allergy 2008;
38:1830-7. [PMID:
18681852 DOI:
10.1111/j.1365-2222.2008.03083.x]
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Abstract
BACKGROUND
The addition of a nitric oxide (NO)-releasing moiety to prednisolone was shown to enhance the anti-inflammatory activity of this glucocorticoid in some experimental conditions, but its effectiveness in the context of eosinophilic inflammation remains to be elucidated.
OBJECTIVE
This study compared the anti-inflammatory effect of prednisolone to a NO-releasing derivative of prednisolone, NCX-1015, using a model of allergen-evoked eosinophil recruitment in rats. The efficacy of a NO-donor compound, DETA-NONOate, was also assessed for comparison.
METHODS
Wistar rats were actively sensitized with Al(OH)(3) plus ovalbumin and 14 days later challenged with antigen intrapleurally. Treatments were performed locally 1 h before challenge. Cysteinyl-leucotrienes (Cys-LT) and eotaxin were measured by ELISA.
RESULTS
Antigen challenge induced an eosinophil infiltration at 12 h, maximal at 24 h. It also caused an increase in the levels of Cys-LTs in the pleural exudate and in the expression of 5-lipoxygenase (5-LO) in infiltrated leucocytes at 6 h, peaking at 12 h and persisting for at least 24 h. Treatment with equimolar doses of prednisolone and NCX-1015 inhibited the late eosinophil infiltration, although the dose required to produce maximal inhibition was about one-tenth that of prednisolone. Cys-LT generation and 5-LO expression were inhibited by NCX-1015 but not by prednisolone. Treatment with prednisolone combined with the NO-donor DETA-NONOate led to a greater inhibition of the eosinophilia and Cys-LT generation as compared with either drug alone. Administration of the steroid receptor antagonist RU 486, 1 h before prednisolone and NCX-1015, abolished the inhibitory effect of the former, under conditions where it only partially affected the latter.
CONCLUSIONS
Our findings indicate that NCX-1015 provided a greater anti-inflammatory effect than prednisolone on the allergic eosinophil recruitment in rats, suggesting that NO-releasing steroids can be considered as a promising therapeutic approach to allergic diseases.
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