Quantification of Autophagosomes in Human Fibroblasts Using Cyto-ID^® Staining and Cytation Imaging

Area of Science:

• Cell Biology
• Molecular Biology
• Biotechnology

Background:

• Autophagy is crucial for cellular homeostasis, involving lysosome-mediated degradation of cellular components.
• Dysregulation of autophagy is linked to various human diseases, necessitating effective methods to study its activity.
• Current methods for autophagy analysis are often time-consuming, expensive, or lack precision for absolute quantification.

Purpose of the Study:

• To develop and present a novel, efficient method for the absolute quantification of autophagosomes in living human cells.
• To enable the comparison of autophagosomal activity under different experimental conditions, such as hyperthermia treatment.
• To provide a versatile protocol adaptable for various therapeutic interventions and substance testing.

Main Methods:

• Utilized the CYTO-ID® Autophagy Detection Kit for selective staining of autophagic compartments in human fibroblasts.
• Employed Hoechst 33342 dye for nuclear counterstaining to allow for normalization.
• Implemented an image-based analysis using a Cytation Imager to quantify autophagosomes per nucleus in living cells.

Main Results:

• Successfully established a method for the absolute quantification of autophagosomes per cell.
• Demonstrated the protocol's effectiveness in comparing autophagy levels after heat therapy versus control conditions.
• Validated the assay as a rapid, user-friendly, and not time-consuming alternative to existing methods.

Conclusions:

• The developed imaging-based method offers precise absolute quantification of autophagosomes in living cells.
• This protocol is suitable for assessing autophagy modulation by various treatments, including hyperthermia.
• The method provides a valuable tool for research into autophagy-related diseases and therapeutic interventions.