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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...

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Related Experiment Video

Updated: Jun 20, 2026

Morphological and Functional Evaluation of Axons and their Synapses during Axon Death in Drosophila melanogaster

Morphological and Functional Evaluation of Axons and their Synapses during Axon Death in Drosophila melanogaster

Published on: March 16, 2020

Autophagy promotes synapse development in Drosophila.

Wei Shen¹, Barry Ganetzky

¹Laboratory of Genetics, University of Wisconsin-Madison, Madison, WI 53706, USA.

The Journal of Cell Biology

|September 30, 2009

Summary

Autophagy, a cellular degradation process, promotes neuromuscular junction (NMJ) growth in Drosophila. This process regulates synaptic development by reducing Hiw protein levels, linking environmental cues to synaptic plasticity.

Area of Science:

Cell Biology
Neuroscience
Developmental Biology

Background:

Autophagy is a lysosome-dependent degradation pathway crucial for cellular homeostasis.
It plays roles in stress response and neuroprotection.
Synaptic development is a complex process regulated by various molecular mechanisms.

Purpose of the Study:

To investigate the role of autophagy in the development of the Drosophila melanogaster larval neuromuscular junction (NMJ).
To understand the molecular mechanisms by which autophagy influences NMJ growth.

Main Methods:

Utilized Drosophila melanogaster as a model organism.
Studied the effects of modulating autophagy on NMJ morphology.
Investigated the interaction between autophagy, highwire (hiw), wallenda (wnd), and c-Jun NH(2)-terminal kinase (bsk).

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Last Updated: Jun 20, 2026

Morphological and Functional Evaluation of Axons and their Synapses during Axon Death in Drosophila melanogaster

Morphological and Functional Evaluation of Axons and their Synapses during Axon Death in Drosophila melanogaster

Published on: March 16, 2020

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Visualizing Synaptic Degeneration in Adult Drosophila in Association with Neurodegeneration

Visualizing Synaptic Degeneration in Adult Drosophila in Association with Neurodegeneration

Published on: May 13, 2020

Main Results:

Autophagy positively regulates Drosophila larval NMJ development.
Autophagy induces an NMJ overgrowth phenotype similar to hiw mutants.
Autophagy-induced NMJ overgrowth is suppressed by wnd and bsk(DN).
Autophagy promotes NMJ growth by decreasing Hiw protein levels.

Conclusions:

Autophagy and the ubiquitin-proteasome system converge in regulating synaptic development.
Autophagy acts as a key regulator of NMJ growth.
Autophagy's responsiveness to environmental cues positions it to link environmental conditions to synaptic growth and plasticity.