Abstract

Monocyte/macrophage cells play a central role in innate immunity against C. neoformans and C. gattii, species known to cause human disease. Cryptococcus is the only fungal genus known to possess such a large extracellular polysaccharide capsule, which impacts interactions of innate cells with the yeast. This interaction results in different fates, such as phagocytosis and intracellular proliferation and, as the interaction progresses, vomocytosis, cell-to-cell transfer, lysis of macrophages, or yeast killing. Differentiating internalized versus external Cryptococcus cells is thus essential to evaluate monocyte-macrophage phagocytosis. We describe here a protocol that allows quantification of Cryptococcus spp. phagocytosis using quantitative flow cytometry in human monocytes and a murine macrophage cell line (J774).

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