FITC-DEVD-FMK is cell permeable, nontoxic, and irreversibly binds to activated caspase-3 in apoptotic cells.
CAT No: HB00012
Fitc-VAD-FMK is a synthetic peptide inhibitor labeled with fluorescein isothiocyanate (FITC), designed for the specific and irreversible inhibition of caspases, particularly those involved in apoptosis pathways. As a cell-permeable, fluorogenic caspase inhibitor, it combines the peptide sequence Val-Ala-Asp (VAD) with a fluoromethyl ketone (FMK) reactive group, enabling covalent binding to the active sites of cysteine proteases. The FITC label allows for direct visualization and quantification of caspase activity in living or fixed cells, making Fitc-VAD-FMK a valuable tool in apoptosis research, cell signaling studies, and biochemical assays where precise detection of programmed cell death is required.
Apoptosis Detection: Fitc-VAD-FMK is widely employed in the detection of apoptosis by targeting activated caspases within cells. Upon entry into the cell, the FMK moiety forms a covalent bond with the catalytic cysteine of active caspases, effectively "trapping" the inhibitor and its fluorescent tag at the site of enzymatic activity. This mechanism enables researchers to visualize and quantify apoptotic cells using fluorescence microscopy or flow cytometry, providing a sensitive and specific approach to monitor cell death events in response to various stimuli or experimental treatments.
Caspase Activity Profiling: In biochemical and cell-based assays, Fitc-VAD-FMK serves as a pan-caspase probe, allowing for the comprehensive profiling of caspase activation states. Its broad-spectrum binding to multiple caspase isoforms facilitates the assessment of global caspase activity in complex biological samples, such as cell lysates or tissue extracts. This application is instrumental in elucidating the kinetics of caspase activation, mapping apoptotic signaling cascades, and distinguishing between different modes of cell death in diverse experimental models.
High-Content Screening: The fluorescent properties of Fitc-VAD-FMK make it suitable for high-throughput and high-content screening platforms aimed at identifying modulators of apoptosis. By integrating this compound into automated imaging or flow cytometry workflows, researchers can efficiently screen large compound libraries or genetic perturbations for their effects on caspase activation. This approach accelerates the discovery of novel apoptosis regulators and supports drug development programs targeting cell death pathways.
Live-Cell Imaging: The cell-permeable nature and direct fluorescence labeling of Fitc-VAD-FMK enable real-time monitoring of caspase activity in living cells. Its use in live-cell imaging experiments allows for the dynamic observation of apoptotic processes as they occur, offering insights into the spatial and temporal aspects of caspase activation. This capability is particularly valuable for studying the progression of apoptosis in response to environmental cues, chemical agents, or genetic modifications in intact cellular systems.
Mechanistic Studies of Cell Death: Beyond its utility in routine detection assays, Fitc-VAD-FMK is a powerful reagent for mechanistic investigations into the molecular basis of programmed cell death. By selectively inhibiting caspase activity and enabling precise localization of caspase-positive cells, it aids in dissecting the roles of individual caspases and their substrates in apoptosis. Researchers can leverage this tool to unravel signaling networks, validate pathway components, and characterize the interplay between apoptosis and other forms of regulated cell death in a wide range of biological contexts.
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