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Related Experiment Videos

A homogeneous caspase-3 activity assay using HTRF technology.

M Préaudat1, J Ouled-Diaf, B Alpha-Bazin

  • 1CIS Biointernational, Research and New Technologies, Bagnols-sur-Cèze, France. mpreaudat@cisbiointernational.fr

Journal of Biomolecular Screening
|July 5, 2002
PubMed
Summary

This study developed a novel assay for caspase inhibitors, crucial for understanding cell death pathways. The assay uses time-resolved fluorescence to detect enzyme activity, aiding in the discovery of potential drug candidates.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Caspases are cysteine proteases central to apoptosis (programmed cell death).
  • Their proteolytic activity involves cleaving specific protein substrates, leading to cellular component degradation.
  • Developing robust assays for caspase activity is vital for drug discovery targeting cell death pathways.

Purpose of the Study:

  • To develop and validate a homogeneous time-resolved fluorescence (HTRF) assay for screening caspase inhibitors.
  • To optimize assay conditions for precision, reproducibility, and robustness.
  • To identify potential drug candidates targeting caspases.

Main Methods:

  • Utilized a double-tagged substrate (biotin-X-DEVDAPK(dnp)-NH(2)) with donor (Europium cryptate) and acceptor (anti-dnp-XL665) fluorescent probes.

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  • Employed HTRF technology, where substrate cleavage by caspases disrupts probe proximity, altering the fluorescence signal.
  • Optimized reagent concentrations and incubation times, comparing performance against a fluorometric method.

    • Main Results:

    • Successfully developed and validated a sensitive HTRF assay for caspase activity detection.
    • Demonstrated that substrate cleavage leads to a decrease in the specific time-resolved fluorescence signal.
    • Optimized assay parameters, ensuring reliability and reproducibility for high-throughput screening.

    Conclusions:

    • The developed HTRF assay is effective for screening caspase inhibitors.
    • This assay provides a valuable tool for identifying novel therapeutic agents targeting caspases.
    • The optimized assay offers improved precision and robustness compared to traditional fluorometric methods.