Assessment of islet cell viability using fluorescent dyes

Area of Science:

• Cell Biology
• Biotechnology
• Medical Diagnostics

Background:

• Assessing islet cell viability is crucial for transplantation and research.
• Existing methods like trypan blue exclusion can be time-consuming and prone to artifacts.
• A rapid, reliable assay is needed for real-time viability assessment.

Purpose of the Study:

• To develop and validate a rapid fluorometric method for evaluating isolated islet cell viability.
• To compare the new assay with existing methods, such as trypan blue exclusion.
• To assess the applicability of the assay to intact islets.

Main Methods:

• Utilized simultaneous staining with acridine orange (inclusion dye) and propidium iodide (exclusion dye).
• Employed fluorescent microscopy to differentiate viable (green fluorescence) and nonviable (red fluorescence) cells.
• Correlated assay results with other established measures of cell viability.

Main Results:

• The acridine orange and propidium iodide assay provides a rapid and accurate measure of islet cell viability.
• Viable cells fluoresce green, while nonviable cells fluoresce red.
• The assay demonstrated superior ease of use, stability, and reduced staining artifacts compared to trypan blue exclusion.
• The method is effective for both isolated cells and intact islets, with distinct fluorescence patterns indicating insulin content and viability.

Conclusions:

• The developed fluorometric assay offers a significant improvement for assessing islet cell viability.
• This method allows for rapid, reliable viability estimation before undertaking extensive experiments.
• The assay's versatility extends to intact islets, providing valuable insights into their viability and insulin-producing capacity.