Abstract
Mast cells play a key role in allergy and inflammation processes as part of the immune response. The activation of mast cells via antigen binding and cross-linking of IgE receptors initiates the onset of dramatic calcium (Ca(2+)) mobilization dynamics that promote the release of mediators of inflammation and allergy. Ca(2+) signaling in mast cells has been studied extensively using a variety of research tools and techniques. In these studies, a large number of proteins have been identified to participate in various stages of these processes. Here we describe single-cell imaging as an important approach for examining Ca(2+) signaling and exocytosis in mast cells. Single-cell imaging tools have advanced significantly over the last 10 years, in part due to improvements in microscope technology and in part due to the development of a new generation of Ca(2+) indicators and genetically encoded Ca(2+) sensors. The single-cell imaging techniques described here provide the spatial and temporal resolution required to decipher the signaling events that are critical for mast cell functions.
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