Optimization of a fluorogenic assay to determine caspase 3/7 activity in meat extracts

Area of Science:

• Biochemistry
• Molecular Biology
• Enzymology

Background:

• General-purpose fluorogenic assay kits have limited utility for determining caspase 3/7 activity in enzyme-scarce biological extracts like meat-based samples.
• Low enzyme concentrations in tissues such as skeletal muscle compromise the sensitivity of standard fluorogenic assays.

Purpose of the Study:

• To enhance the sensitivity of fluorogenic assays for measuring caspase 3/7 activity in tissues with scarce enzyme concentrations.
• To optimize protocols for reduced reagent consumption and cost-effectiveness in enzyme activity assays.
• To develop a straightforward, high-throughput method for analyzing caspase 3/7 activity.

Main Methods:

• Optimization of enzyme extraction procedures for skeletal muscle tissue.
• Adjustment of peptide substrate, dithiothreitol concentration, and detection settings for microtiter-plate fluorometers.
• Development of a protocol suitable for 96-well microtiter plates to enable high-throughput analysis.

Main Results:

• The developed protocol significantly enhances the sensitivity of fluorogenic assays for caspase 3/7 activity.
• The method allows for the measurement of a wide range of enzyme activities, from 10,000 to 260,000 relative fluorescence units.
• The use of 96-microtiter well plates reduces chemical reagent consumption, promoting environmental sustainability.

Conclusions:

• The optimized protocol provides a sensitive and economical method for determining caspase 3/7 activity in enzyme-limited biological samples.
• This approach is particularly valuable for skeletal muscle tissue analysis and contributes to greener laboratory practices.
• The enhanced assay facilitates accurate enzyme activity measurements in high-throughput screening and research settings.