Airway epithelial cells produce neurotrophins and promote the survival of eosinophils during allergic airway inflammation

The Journal of Allergy and Clinical Immunology
Christian HahnWolfgang Andreas Nockher

Abstract

Eosinophil-epithelial cell interactions make a major contribution to asthmatic airway inflammation. Nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), and other members of the neurotrophin family, originally defined as a class of neuronal growth factors, are now recognized to support the survival and activation of immune cells. Neurotrophin levels are increased in bronchoalveolar lavage fluid during allergic asthma. We sought to investigate the role of neurotrophins as inflammatory mediators in eosinophil-epithelial cell interactions during the allergic immune response. Neurotrophin expression in the lung was investigated by means of immunohistochemistry and ELISA in a mouse model of chronic experimental asthma. Coculture experiments were performed with airway epithelial cells and bronchoalveolar lavage fluid eosinophils. Neurotrophin levels increased continuously during chronic allergic airway inflammation, and airway epithelial cells were the major source of NGF and BDNF within the inflamed lung. Epithelial neurotrophin production was upregulated by IL-1beta, TNF-alpha, and T(H)2 cytokines. Lung eosinophils expressed the BDNF and NGF receptors tropomyosin-related kinase (Trk) A and TrkB, and coculture with a...Continue Reading

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