Validation of IKK beta as therapeutic target in airway inflammatory disease by adenoviral-mediated delivery of dominant-negative IKK beta to pulmonary epithelial cells

Catley, Matthew C. and Chivers, Joanna E. and Holden, Neil S. and Barnes, Peter J. and Newton, Robert (2005) Validation of IKK beta as therapeutic target in airway inflammatory disease by adenoviral-mediated delivery of dominant-negative IKK beta to pulmonary epithelial cells. British journal of pharmacology, 145 (1). pp. 114-22. ISSN 0007-1188

Full content URL: http://dx.doi.org/10.1038/sj.bjp.0706170

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Validation of IKK beta as therapeutic target in airway inflammatory disease by adenoviral-mediated delivery of dominant-negative IKK beta to pulmonary epithelial cells

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Abstract

Asthma is an inflammatory disease of the lungs and the transcription factor NF-kappa B regulates the production of numerous inflammatory mediators that may have a role in the pathogenesis of asthma. Hence, the signalling pathways leading to NF-kappa B activation are considered prime targets for novel anti-inflammatory therapies. The prevention of NF-kappa B activity in mice, through the knockout of IKK beta or p65, causes fatal liver degeneration in utero making it difficult to determine the full implications of inhibiting NF-kappaB activity in tissues physiologically relevant to human diseases. This study used adenovirus delivery of a dominant inhibitor of NF-kappaB (I kappa B alpha delta N) and dominant-negative IKK alpha (IKK alpha(KM)) and IKK beta (IKK beta(KA)) to investigate the role of the individual IKKs in NF-kappa B activation and inflammatory gene transcription by human pulmonary A549 cells. Overexpression of IKK beta(KA) or I kappa B alpha delta N prevented NF-kappa B-dependent transcription and DNA binding. IKK beta(KA) also prevented I kappa B alpha kinase activity. Similarly, IKK beta(KA) and I kappa B alpha delta N overexpression also inhibited IL-1beta- and TNF alpha-dependent increases in ICAM-1, IL-8 and GM-CSF in addition to IL-1beta-mediated increases in cyclooxygenase-2 expression, whereas IKK alpha(KM) overexpression had little effect on these outputs. IKK beta(KA) also reduced cell viability and induced caspase-3 and PARP cleavage regardless of the stimuli, indicating the induction of apoptosis. This effect seemed to be directly related to IKK beta kinase activity since I kappa B alpha delta N only induced PARP cleavage in TNF alpha-treated cells. These results demonstrate that inhibition of IKK beta and NF-kappa B suppresses inflammatory mediator production and reduces A549 cell viability. Thus, novel therapies that target IKK beta could have potent anti-inflammatory effects and may be beneficial in the treatment of certain cancers.

Keywords:Apoptosis, cytokines, granulocyte/macrophage colony-stimulating factor (GM-CSF), I-kappa B Kinase, IL-8, NF-kappa B, prostaglandin GH synthase, Pulmonary epithelium, signal transduction
Subjects:B Subjects allied to Medicine > B210 Pharmacology
Divisions:College of Science > School of Life Sciences
ID Code:15130
Deposited On:21 Nov 2014 12:49

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