Abstract
Group A Streptococcus (GAS) is one of the major human pathogens that can invade nonphagocytic cells. GAS internalized through endocytosis secretes the pore-forming toxin Streptolysin O (SLO) to escape into the cytoplasm. The cytosolic GAS is selectively captured by autophagic membranes (GAS-containing autophagosome-like vacuoles, GcAVs) and delivered to lysosomes for degradation. Macroautophagy (referred to as autophagy hereafter) is a highly conserved lysosome-mediated catabolic process, which is critical for cellular homeostasis. Autophagy also acts as an intracellular immune system. In this section, we describe how to identify GcAVs in infected cells using fluorescent microscopy.
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