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Updated: Dec 29, 2025
Quantitative Analysis of Autophagy using Advanced 3D Fluorescence Microscopy
Published on: May 3, 2013
Monitoring spatiotemporal changes in chaperone-mediated autophagy in vivo
S Dong1,2, C Aguirre-Hernandez1,2,3,4, A Scrivo1,2
1Department of Development and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY, 10461, USA.
Abstract:
Autophagy malfunctioning occurs in multiple human disorders, making attractive the idea of chemically modulating it with therapeutic purposes. However, for many types of autophagy, a clear understanding of tissue-specific differences in their activity and regulation is missing because of lack of methods to monitor these processes in vivo. Chaperone-mediated autophagy (CMA) is a selective type of autophagy that until now has only been studied in vitro and not in the tissue context at single cell resolution. Here, we develop a transgenic reporter mouse that allows dynamic measurement of CMA activity in vivo using image-based procedures. We identify previously unknown spatial and temporal differences in CMA activity in multiple organs and in response to stress. We illustrate the versatility of this model for monitoring CMA in live animals, organotypic cultures and cell cultures from these mice, and provide practical examples of multiorgan response to drugs that modulate CMA.
Insights
Researchers developed a new reporter mouse to measure chaperone-mediated autophagy (CMA) activity in vivo. This tool reveals tissue-specific CMA differences and responses to stress and drugs across multiple organs.
Area of Science:
- Cellular Biology
- Molecular Biology
- Physiology
Background:
- Autophagy is crucial in human diseases, but its tissue-specific regulation is poorly understood due to limited in vivo monitoring methods.
- Chaperone-mediated autophagy (CMA), a selective autophagy pathway, has primarily been studied in vitro, lacking single-cell resolution in a tissue context.
- Developing tools to visualize and quantify CMA activity in live tissues is essential for understanding its physiological and pathological roles.
Purpose of the Study:
- To develop a novel transgenic reporter mouse model for dynamic, in vivo measurement of chaperone-mediated autophagy (CMA) activity.
- To investigate tissue-specific and temporal differences in CMA activity under basal and stress conditions.
- To demonstrate the utility of the reporter mouse for studying CMA in various biological contexts, including drug responses.
Main Methods:
- Creation of a transgenic reporter mouse allowing image-based, dynamic measurement of CMA activity.
- In vivo imaging and analysis of CMA activity in multiple organs of the reporter mice.
- Application of the model in organotypic and cell cultures derived from the reporter mice.
- Monitoring multiorgan responses to pharmacological agents that modulate CMA.
Main Results:
- Identification of previously unrecognized spatial and temporal variations in CMA activity across different organs.
- Demonstration of dynamic CMA responses to various physiological and pharmacological stresses.
- Successful application of the reporter system in live animals, organotypic cultures, and cell cultures for CMA monitoring.
- Practical examples showcasing multiorgan CMA modulation by specific drugs.
Conclusions:
- The developed transgenic reporter mouse provides an unprecedented tool for real-time, in vivo monitoring of CMA activity at single-cell resolution.
- This model facilitates the discovery of novel insights into the tissue-specific regulation and dynamic behavior of CMA.
- The findings highlight the potential of targeting CMA therapeutically and underscore the importance of understanding its organ-specific functions.
