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Merck

Analysis of Phagosomal Antigen Degradation by Flow Organellocytometry.

Bio-protocol (2017-02-28)
Eik Hoffmann, Anne-Marie Pauwels, Andrés Alloatti, Fiorella Kotsias, Sebastian Amigorena
ABSTRACT

Professional phagocytes internalize self and non-self particles by phagocytosis to initiate innate immune responses. After internalization, the formed phagosome matures through fusion and fission events with endosomes and lysosomes to obtain a more acidic, oxidative and hydrolytic environment for the degradation of its cargo. Interestingly, phagosome maturation kinetics differ between cell types and cell activation states. This protocol allows to quantify phagosome maturation kinetics on a single organelle level in different types of phagocytes using flow cytometry. Here, ovalbumin (OVA)-coupled particles are used as phagocytosis model system in dendritic cells (DC), which are internalized by phagocytosis. After different time points, phagosome maturation parameters, such as phagosomal degradation of OVA and acquisition of lysosomal proteins (like LAMP-1), can be measured simultaneously in a highly quantitative manner by flow organellocytometry. These read-outs can be correlated to other phagosomal functions, for example antigen degradation, processing and loading in DC.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Anti-Chicken Egg Albumin antibody produced in rabbit, whole antiserum
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