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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
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Autophagy, viruses, and intestinal immunity.

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  • 1aKimmel Center for Biology and Medicine at the Skirball Institute bDepartment of Microbiology, New York University School of Medicine, New York, New York, USA.

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Autophagy, a cellular process, is crucial for maintaining gut health by regulating immune responses to pathogens and beneficial microbes. Understanding autophagy enhances treatments for gastrointestinal disorders.

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Area of Science:

  • Gastroenterology
  • Immunology
  • Cell Biology

Background:

  • Autophagy is a cellular degradative pathway involved in maintaining cellular homeostasis.
  • Recent genetic studies link autophagy to inflammatory bowel disease (IBD) susceptibility.
  • The role of autophagy in intestinal immunity is an emerging area of research.

Purpose of the Study:

  • To review recent findings on the role of autophagy in intestinal immunity.
  • To highlight the importance of autophagy in responding to gut pathogens and commensals.
  • To explore the intersection of autophagy with other stress response pathways in mucosal immunity.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of genetic association studies.
  • Examination of findings from mouse models of intestinal inflammation.
  • Integration of data on host-microbe interactions.

Main Results:

  • Autophagy proteins are essential for maintaining the intestinal barrier function.
  • Autophagy influences the quality and magnitude of immune responses to intestinal microbes.
  • Autophagy and IBD susceptibility genes regulate inflammatory responses to viruses.
  • Viruses engage in complex interactions with the host and microbiota.

Conclusions:

  • Autophagy intersects with other immune and stress response pathways in the gut.
  • A deeper understanding of autophagy's role is vital for developing new treatments for gastrointestinal disorders.
  • Cell-type and microbe-specific interactions involving autophagy, including viruses, are critical for mucosal immunity.