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Related Concept Videos

Autophagy01:27

Autophagy

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.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
Delivery Pathways to the Lysosome01:36

Delivery Pathways to the Lysosome

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.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Phagocytosis of Apoptotic Cells01:17

Phagocytosis of Apoptotic Cells

Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
Normal cells contain receptors that prevent them from being recognized by phagocytes.
Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Immune Surveillance by NK Cells and Phagocytes01:25

Immune Surveillance by NK Cells and Phagocytes

Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
Cellular Injury V: Apoptosis and Autophagy01:22

Cellular Injury V: Apoptosis and Autophagy

Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...

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Related Experiment Video

Updated: Jun 19, 2026

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
07:20

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

Published on: January 31, 2025

Autophagy and innate recognition systems.

Michal Caspi Tal1, Akiko Iwasaki

  • 1Department of Immunobiology, Yale University School of Medicine, 300 Cedar Street, New Haven, CT 06520, USA.

Current Topics in Microbiology and Immunology
|October 6, 2009
PubMed
Summary

Autophagy, a cellular recycling process, plays a crucial role in innate immunity by helping cells detect and clear pathogens like viruses. This pathway is vital for maintaining cellular balance and fighting infections.

Area of Science:

  • Cell Biology
  • Immunology
  • Molecular Biology

Background:

  • Autophagy is a fundamental cellular process for degrading damaged components and maintaining homeostasis.
  • Emerging research highlights a significant crosstalk between autophagy and the innate immune system.
  • Innate immune signaling pathways directly influence the induction of autophagy.

Purpose of the Study:

  • To elucidate the multifaceted roles of autophagy in innate immune responses.
  • To explore how autophagy machinery interacts with pathogen recognition and clearance mechanisms.
  • To investigate potential autophagy-independent functions of autophagy-related molecules in immunity.

Main Methods:

  • Review of recent scientific literature and studies.
  • Analysis of signaling pathways involving pattern recognition receptors and autophagy.

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Visualizing the Early Stages of Phagocytosis
08:04

Visualizing the Early Stages of Phagocytosis

Published on: February 3, 2017

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Last Updated: Jun 19, 2026

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
07:20

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

Published on: January 31, 2025

Visualizing the Early Stages of Phagocytosis
08:04

Visualizing the Early Stages of Phagocytosis

Published on: February 3, 2017

  • Examination of the role of autophagy in pathogen sensing and degradation by immune cells.

    • Main Results:

    • Autophagy is induced by innate pattern recognition receptors, aiding in the detection of viral infections.
    • Autophagy machinery is essential for phagocytic cells to clear extracellular pathogens.
    • Autophagy components can negatively regulate cytosolic sensors for RNA viruses.
    • Evidence suggests autophagy molecules may have functions independent of the core autophagic process.

    Conclusions:

    • The autophagic machinery is integral to various innate immune functions, including pathogen surveillance and clearance.
    • Understanding the interplay between autophagy and innate immunity opens new avenues for therapeutic strategies.
    • Autophagy-related molecules may possess dual roles, participating in both canonical autophagy and distinct immune processes.