Login

Journal Image
Inflammation & Allergy-Drug Targets
(Formerly Current Drug Targets - Inflammation & Allergy)
ISSN (Print): 1871-5281
ISSN (Online): 2212-4055
VOLUME: 5
ISSUE: 4
DOI: 10.2174/187152806779010909      Price:  $58









Interferon-γ as a Possible Target in Chronic Asthma

img
Author(s): Rakesh K. Kumar, Dianne C. Webb, Cristan Herbert and Paul S. Foster
Pages 253-256 (4)
Abstract:
The role of interferon-γ(IFN-γ) in asthma is controversial. However, this cytokine has been proposed to play a role both in acute severe asthma and chronic stable asthma. We have shown that in a chronic low-level challenge model of allergic asthma in mice, which replicates characteristic features of airway inflammation and remodelling, the mechanisms of airway hyperreactivity (AHR) are markedly different to those in short-term high-level challenge models. Notably, AHR is independent of various Th2 cytokines and their signalling pathways. However, administration of a neutralising antibody to IFN-γ suppresses AHR. More recently, we have found that following chronic allergen challenge, but not acute challenge, IFN-γ -producing CD4+ T cells are demonstrable in peribronchial lymph nodes, both in wild-type mice and in STAT6 / mice. Treatment with anti-IFN-γ decreases the number of IFN-γ-producing CD4+ T cells in both wild-type and gene-targeted mice, providing a possible explanation for the ability of anti-IFN-γ to inhibit AHR in the setting of chronic challenge. These data further strengthen the notion that the pathogenesis of the lesions of asthma, and especially of AHR, involves a co-operative interaction between Th2 and Th1 cytokines. This may be particularly relevant to acute exacerbations of asthma, in which setting there may be justification for therapeutic inhibition of IFN-γ.
Keywords:
Th1 and Th2 cytokines, interferon-γ, asthma, acute exacerbation, airway hyper-reactivity
Affiliation:
Department of Pathology, School of Medical Sciences, University of New South Wales, Sydney, Australia 2052.