How does caspase-3 cause apoptosis?
Caspase-3 is known as an executioner caspase in apoptosis because of its role in coordinating the destruction of cellular structures such as DNA fragmentation or degradation of cytoskeletal proteins (1). The activity of caspase-3 is tightly regulated and it is produced as zymogen in an inactive pro-form (1).
Is caspase-3 Required for apoptosis?
Among them, caspase-3 is a frequently activated death protease, catalyzing the specific cleavage of many key cellular proteins. Caspase-3 is also required for some typical hallmarks of apoptosis, and is indispensable for apoptotic chromatin condensation and DNA fragmentation in all cell types examined.
How is caspase-3 activated?
Caspase-3 is activated in the apoptotic cell both by extrinsic (death ligand) and intrinsic (mitochondrial) pathways. The zymogen feature of caspase-3 is necessary because if unregulated, caspase activity would kill cells indiscriminately.
How does caspase-3 assay work?
The Caspase-3 assay protocol is based on the formation of the chromophore p-nitroaniline (p-NA) by cleavage from the labeled substrate DEVD-pNA. The p-NA can be quantified using a spectrophotometer or a microtiter plate reader reading absorbance at 400 or 405 nm.
How does caspase help apoptosis?
Caspases are a large family of evolutionarily conserved, aspartate-specific cysteine proteases that are essential for the initiation and execution of apoptosis1-3. Initiator caspases initiate the apoptosis signal while the executioner caspases carry out the mass proteolysis that leads to apoptosis.
What is a limitation of the caspase-3 assay?
Additionally, the main limitations for our multiplexing protocol are that caspase-3/7 activity can determined but not quantified, and the resulting lysate cannot be used for downstream assays (i.e. Western blots or gene expression).
What is caspase-3 stain?
Activation of caspases plays a central role in apoptosis. The PromoKine Red Caspase-3 Staining Kit provides a convenient means for detecting activated Caspase-3 in living cells. The assay utilizes a Caspase-3 inhibitor DEVD-FMK conjugated to sulfo-rhodamine (Red-DEVD-FMK) as the fluorescent in situ marker.
What do caspases do during apoptosis?
Caspases are a family of cysteine proteases that serve as primary effectors during apoptosis to proteolytically dismantle most cellular structures, including the cytoskeleton, cell junctions, mitochondria, endoplasmic reticulum, Golgi, and the nucleus (Taylor et al., 2008).
How does caspase cascade work?
Caspases are a family of cysteine proteases that act in concert in a cascade triggered by apoptosis signaling. The culmination of this cascade is the cleavage of a number of proteins in the cell, followed by cell disassembly, cell death, and, ultimately, the phagocytosis and removal of the cell debris.
How does caspase 3 and 7 cause apoptosis?
Caspase-3 and caspase-7 are both activated universally during apoptosis, irrespective of the specific death-initiating stimulus, and both proteases are widely considered to coordinate the demolition phase of apoptosis by cleaving a diverse array of protein substrates (1, 2).
Why are caspases called caspases?
They are named Caspases due to their specific cysteine protease activity – a cysteine in its active site nucleophilically attacks and cleaves a target protein only at the C-terminal of an aspartic acid amino acid.
