In vivo autophagy quantification: Measuring LC3 and P62 puncta in 3D image system from zebrafish larvae

Area of Science:

• Cellular Biology
• Molecular Biology
• Zebrafish Models

Background:

• Autophagy is crucial for cellular homeostasis, involving the degradation of damaged cellular components.
• LC3 protein detection via western blot or immunofluorescence is standard for autophagy assessment.
• Zebrafish larvae present challenges for LC3 western blot due to protease activity degrading the protein.

Purpose of the Study:

• To develop a fast and accurate method for quantifying autophagy in zebrafish larvae.
• To utilize LC3 and P62 immunostaining for autophagy measurement, overcoming western blot limitations.

Main Methods:

• Whole-mount immunostaining of zebrafish larvae for autophagy markers LC3 and P62.
• Three-dimensional (3D) image analysis of immunostained zebrafish larvae.
• Quantification of LC3 and P62 puncta using 3D imaging techniques.

Main Results:

• Demonstrated that 3D image analysis of LC3 and P62 immunostaining provides quantitative autophagy data.
• The 3D imaging method is rapid and accurate for monitoring autophagy in zebrafish.
• This technique circumvents the degradation issues associated with LC3 western blot analysis in zebrafish.

Conclusions:

• Three-dimensional image analysis of LC3 and P62 immunostaining is a robust quantitative tool for autophagy studies in zebrafish.
• This method offers a significant advantage over traditional western blot analysis for autophagy assessment in this model organism.
• The developed technique enhances the ability to study cellular homeostasis and autophagic flux in zebrafish larvae.