The role of intracellular calcium signals in inflammatory responses of polarised cystic fibrosis human airway epithelia

Drugs in R&D
Carla M P Ribeiro

Abstract

Hyperinflammatory host responses to bacterial infection have been postulated to be a key step in the pathogenesis of cystic fibrosis (CF) lung disease. Previous studies have indicated that the CF airway epithelium itself contributes to the hyperinflammation of CF airways via an excessive inflammatory response to bacterial infection. However, it has been controversial whether the hyperinflammation of CF epithelia results from mutations in the CF transmembrane conductance regulator (CFTR) and/or is a consequence of persistent airways infection. Recent studies have demonstrated that intracellular calcium (Ca2+i) signals consequent to activation of apical G protein-coupled receptors (GPCRs) by pro-inflammatory mediators are increased in CF airway epithelia. Because of the relationship between Ca2+i mobilisation and inflammatory responses, the mechanism for the increased Ca2+i signals in CF was investigated and found to result from endoplasmic reticulum (ER) Ca2+ store expansion. The ER Ca2+ store expansion imparts a hyperinflammatory phenotype to chronically infected airway epithelia as a result of the larger Ca2+i mobilisation coupled to an excessive inflammatory response following GPCR activation. The ER expansion is not dependen...Continue Reading

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