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Updated: May 20, 2025

Quantitative Analysis of Autophagy using Advanced 3D Fluorescence Microscopy

Quantitative Analysis of Autophagy using Advanced 3D Fluorescence Microscopy

Published on: May 3, 2013

Microscopy-based methods for characterizing autophagy and understanding its dynamics in resin secretion.

Shelly F de Carvalho¹, Elton L Scudeler², Silvia R Machado³

¹Postgraduate Program in Plant Biology, Institute of Biosciences of Botucatu (IBB), São Paulo State University (UNESP), Botucatu, SP, Brazil; Electron Microscopy Center (CME), Institute of Biosciences of Botucatu (IBB), São Paulo State University (UNESP), Botucatu, SP, Brazil.

Micron (Oxford, England : 1993)

|March 26, 2025

Summary

Autophagy, a cellular recycling process, occurs in Anacardium humile resin glands. Macroautophagy peaks during secretion, while microautophagy happens later, crucial for gland function.

Keywords:

ATG8 AcPase Immunogold labeling Macroautophagy Microautophagy Ultrastruture ZIO method

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Published on: July 21, 2017

Area of Science:

Plant Biology
Cell Biology
Biochemistry

Background:

Resin-secretory canals in Anacardiaceae plants yield valuable resins.
Autophagy is implicated in resin gland development, but its specific role in Anacardium humile is understudied.

Purpose of the Study:

To investigate the occurrence, timing, and mechanisms of autophagy in Anacardium humile resin glands.
To clarify the role of autophagy in the resin secretory cycle.

Main Methods:

Transmission electron microscopy
Cytochemical assays
Immunogold labeling
Confocal immunofluorescence microscopy

Main Results:

Two types of autophagy identified: macroautophagy during peak secretion and microautophagy during later stages.
Autophagosomes degrade cellular components before fusing with vacuoles.
No evidence of mega-autophagy was observed, differing from previous interpretations of cell death.

Conclusions:

Autophagy is precisely timed and regulated in A. humile resin glands, essential for cell function.
The interplay between autophagy and terpene biosynthesis warrants further research.