This manuscript describes a simple method to measure the phagosomal pH and area as well as the cytoplasmic pH of human and mouse neutrophils using the ratiometric indicator seminaphthorhodafluor (SNARF)-1, or S-1. This is achieved using live-cell confocal fluorescence microscopy and image analysis.
Foote, J. R., Levine, A. P., Behe, P., Duchen, M. R., Segal, A. W. Imaging the Neutrophil Phagosome and Cytoplasm Using a Ratiometric pH Indicator. J. Vis. Exp. (122), e55107, doi:10.3791/55107 (2017).