Interleukin-2-induced increased airway responsiveness and lung Th2 cytokine expression occur after antigen challenge through the leukotriene pathway.

Abstract:

:Previous studies have shown that the allergic late airway response (LR) is dependent on the leukotriene (LT) pathway in Brown Norway (BN) rats. In this same model, interleukin-2 (IL-2) has been shown to increase allergic airway responses without increasing LT production. This study examined the relationship between the upregulation of cellular immunity with IL-2 and the LT pathway in ovalbumin-sensitized BN rats. Airway responsiveness to LTD(4) was significantly increased in BN rats pretreated with IL-2 (20,000 U twice a day for 4.5 days). Treatment with montelukast, a cysteinyl LT(1) receptor antagonist, blocked IL-2's induced increase of the LR to ovalbumin challenge. When cytokine expression was assessed either by semiquantitative polymerase chain reaction or in situ hybridization, we found that montelukast decreased the amount of IL-4 mRNA expression in the lungs while increasing the amount of interferon-gamma mRNA expression 8 hours after challenge. These results indicate that upregulation of cellular immunity with IL-2 can increase the sensitivity of the airways to LTD(4) and that inhibition of the LT pathway will block the LR and modulate cytokine expression after antigen challenge.

authors

Nag S,Lamkhioued B,Renzi PM

doi

10.1164/rccm.2109012

keywords:

subject

Has Abstract

pub_date

2002-06-01 00:00:00

pages

1540-5

issue

11

eissn

1073-449X

issn

1535-4970

journal_volume

165

pub_type

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