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Autophagy01:27

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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.
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Quantitative Analysis of Autophagy using Advanced 3D Fluorescence Microscopy
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Imaging autophagy.

Eleftherios Karanasios1, Eloise Stapleton, Maria Manifava

  • 1Signalling Programme, The Babraham Institute, Cambridge, United Kingdom.

Current Protocols in Cytometry
|July 3, 2014
PubMed
Summary
This summary is machine-generated.

This study details fluorescence microscopy protocols for visualizing autophagy dynamics in live and fixed cells. Combining live-cell imaging and fixed-cell immunostaining enhances the robustness of autophagy research.

Keywords:
ULK1autophagyfluorescence microscopylive-cell imagingomegasomes

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Autophagy is a critical cellular degradation pathway involving the formation of autophagosomes to deliver cytosolic material to lysosomes.
  • Fluorescence microscopy is a key technique for studying cellular processes, including autophagy, by visualizing proteins of interest (POIs).
  • Current methods for POI visualization include genetic fluorescent protein tagging for live cells and antibody-based immunostaining for fixed cells.

Purpose of the Study:

  • To provide detailed protocols for visualizing autophagy dynamics using fluorescence microscopy in both live and fixed cells.
  • To compare the advantages and critical parameters of live-cell imaging versus fixed-cell immunostaining for autophagy studies.
  • To demonstrate how combining these techniques increases the robustness of autophagy research.

Main Methods:

  • Detailed protocols for live-cell fluorescence microscopy using genetically encoded fluorescent protein tags to visualize autophagy.
  • Detailed protocols for fixed-cell fluorescence microscopy employing antibody-based immunostaining to detect autophagy-related proteins.
  • Comparative analysis of critical parameters, advantages, and limitations of both live and fixed cell imaging techniques.

Main Results:

  • Established robust protocols for visualizing autophagy dynamics in real-time using live-cell imaging.
  • Developed effective immunostaining protocols for fixed cells to analyze autophagy markers.
  • Demonstrated that the combined application of live and fixed cell fluorescence microscopy significantly enhances the reliability and depth of autophagy studies.

Conclusions:

  • Fluorescence microscopy, applied to both live and fixed cells, is essential for comprehensive autophagy research.
  • The choice between live-cell imaging and fixed-cell immunostaining depends on specific research questions, but combining them offers superior insights.
  • These detailed protocols and comparative analysis serve as a valuable resource for researchers investigating autophagy dynamics.