LC3-associated phagocytosis: host defense and microbial response

S Upadhyay, JA Philips - Current opinion in immunology, 2019 - Elsevier
Current opinion in immunology, 2019Elsevier
Highlights•LC3-associated phagocytosis (LAP) and xenophagy target microbes for
lysosomal destruction.•LAP and xenophagy not only make use of shared components but
also have unique requirements.•The consequences of LAP on microbial control and
inflammation depends upon the cargo and host cell.•Pathogens have evolved diverse
strategies to evade LAP.The innate immune system has evolved to recognize diverse
microbes and destroy them. At the same time, microbial pathogens undermine immunity to …
Highlights
  • LC3-associated phagocytosis (LAP) and xenophagy target microbes for lysosomal destruction.
  • LAP and xenophagy not only make use of shared components but also have unique requirements.
  • The consequences of LAP on microbial control and inflammation depends upon the cargo and host cell.
  • Pathogens have evolved diverse strategies to evade LAP.
The innate immune system has evolved to recognize diverse microbes and destroy them. At the same time, microbial pathogens undermine immunity to cause disease. Here, we highlight recent advances in understanding an antimicrobial pathway called LC3-associated phagocytosis (LAP), which combines features of autophagy with phagocytosis. Upon phagocytosis, many microbes, including bacteria, fungi, and parasites, are sequestered in an LC3-positive, single-membrane bound compartment, a hallmark of LAP. LAP depends upon NADPH oxidase activity at the incipient phagosome and culminates in lysosomal trafficking and microbial degradation. Most often LAP is an effective host defense, but some pathogens evade LAP or replicate successfully in this microenvironment. Here, we review how LAP targets microbial pathogens and strategies pathogens employ to circumvent LAP.
Elsevier
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