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Autophagy

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 Lysosome

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...

Autophagic Cell Death

Autophagic Cell Death

Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and...

Lysosomes

Lysosomes

Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...

Phagocytosis

Phagocytosis

Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis (“cellular eating”) is one of three major types of endocytosis. Cells use phagocytosis to take in large objects—such as other cells (or their debris), bacteria, and even viruses.

Phagocytosis

Phagocytosis

Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis ("cellular eating") is one of three major types of endocytosis. Cells use phagocytosis to take in large objects, such as other cells (or their debris), bacteria, and even viruses.
The objective of phagocytosis is often destruction. Cells use phagocytosis to eliminate unwelcome visitors, like pathogens (e.g., viruses and bacteria). Many immune system cells,...

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Related Experiment Video

Updated: Oct 29, 2025

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

Published on: January 31, 2025

The Classification and Basic Processes of Autophagy.

Tiejian Nie¹, Lin Zhu¹, Qian Yang²

¹Department of Experimental Surgery, Tangdu Hospital, The Fourth Military Medical University, Xi'an, Shaanxi, China.

Advances in Experimental Medicine and Biology

|July 14, 2021

Summary

This summary is machine-generated.

Autophagy is a cellular process for degrading internal components via lysosomes. This essential mechanism, vital for homeostasis, has distinct types and is implicated in various human diseases when dysregulated.

Keywords:

Autophagy Basic process Selective autophagy Types

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Last Updated: Oct 29, 2025

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

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Published on: January 31, 2025

Analyzing Starvation-Induced Autophagy in the Drosophila melanogaster Larval Fat Body

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Published on: August 4, 2022

Live Cell Imaging of Early Autophagy Events: Omegasomes and Beyond

Live Cell Imaging of Early Autophagy Events: Omegasomes and Beyond

Published on: July 27, 2013

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Autophagy is the lysosomal degradation of intracellular components in eukaryotic cells.
It is crucial for maintaining cellular homeostasis and adapting to environmental changes.
Dysregulation of autophagy is linked to numerous human diseases.

Purpose of the Study:

To provide a comprehensive overview of autophagy.
To categorize the different types of autophagy based on substrate transport and cargo selectivity.
To highlight the role of autophagy in cellular health and disease.

Main Methods:

Literature review of autophagy mechanisms.
Classification of autophagy based on substrate transport (macroautophagy, microautophagy, CMA).
Categorization based on cargo selectivity (selective vs. nonselective autophagy).

Main Results:

Autophagy involves three main types: macroautophagy, microautophagy, and chaperone-mediated autophagy (CMA).
Autophagy can be selective, targeting specific substrates, or nonselective, degrading bulk cytoplasmic components.
Each type utilizes unique molecular machinery and is tightly regulated.

Conclusions:

Autophagy is a fundamental cellular process essential for homeostasis.
Understanding the different types and regulation of autophagy is key to comprehending its role in health and disease.
Further research into autophagy dysregulation may reveal therapeutic targets for human diseases.