The Guava Caspase Assay Suite of fluorescent-based assays for Caspase
3/7, 8, 9 and multi-caspase employ the same protocol making it easier
to perform multiple caspase assays in parallel. Further, Guava caspase
reagents are membrane permeable allowing one to measure intracellular
levels of the enzyme without using harsh lysis methods. The Guava
Caspase Assays employ a FLICA (Fluorescent Labeled Inhibitor of
Caspase) reagent that specifically identifies active caspases. Each FLICA is
comprised of three subunits:
– an active site binding peptide to confer specifi city (DEVD for caspase 3/7,
LETD for caspase 8, LEHD for caspase 9, and VAD for multi-caspase)
– a covalent crosslinking agent (FMK)
– a green (FAM) or orange-red fl uorescent probe (SR): SR is excited by blue
or green lasers (PCA Systems or EasyCyte Systems), FAM by blue lasers
only (EasyCyte Systems)
The Guava Caspase Assays also include the nuclear DNA stain, 7-AAD, to
simultaneously evaluate membrane integrity and cell viability.