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        Measurements of Intracellular Calcium Signals in Polarized Primary Cultures of Normal and Cystic Fibrosis Human Airway Epithelia

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        The airways are continuously challenged by a variety of stimuli including bacteria, viruses, allergens, and inflammatory factors that act as agonists for G protein-coupled receptors (GPCR). Intracellular calcium (Ca2+ i ) mobilization in airway epithelia in response to extracellular stimuli regulates key airway innate defense functions, e.g., Ca2+ -activated Cl secretion, ciliary beating, mucin secretion, and inflammatory responses. Because Ca2+ i mobilization in response to luminal stimuli is larger in CF vs. normal human airway epithelia, alterations in Ca2+ i signals have been associated with the pathogenesis of CF airway disease. Hence, assessment of Ca2+ i signaling has become an important area of CF research. This chapter will focus on measurements of cytoplasmic and mitochondrial Ca2+ signals resulting from GPCR activation in polarized primary cultures of normal and CF human bronchial epithelia (HBE).
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