Phagosomal pH influences phagosome maturation, oxidant production, phagosomal killing as well as antigen presentation. Here we describe a ratiometric method for measuring time-course and endpoint pH changes in individual phagosomes in living phagocytes using fluorescence microscopy.
Nunes, P., Guido, D., Demaurex, N. Measuring Phagosome pH by Ratiometric Fluorescence Microscopy. J. Vis. Exp. (106), e53402, doi:10.3791/53402 (2015).