Z-WEHD-FMK is an effective, cell-permeable and irreversible inhibitor of caspase-1, caspase-5 and cathepsin B (IC50 = 6 µM). It can inhibit apoptosis in multiple biological systems.
CAT No: R0900
CAS No:210345-00-9
Synonyms/Alias:Caspase-1 inhibitor (fluoromethylketone), Caspase-5 inhibitor (fluoromethylketone)
Caspase-1/ICE Inhibitor Z-WEHD-FMK is a synthetic peptide-based compound designed as a potent and selective irreversible inhibitor of caspase-1, also known as interleukin-1β converting enzyme (ICE). Structurally, it features a fluoromethyl ketone (FMK) moiety linked to the tetrapeptide sequence WEHD, which mimics the natural substrate recognition motif of caspase-1. By covalently modifying the active site cysteine of the enzyme, this inhibitor effectively blocks caspase-1-mediated proteolytic activity. Caspase-1 plays a pivotal role in the maturation of pro-inflammatory cytokines such as IL-1β and IL-18, making Z-WEHD-FMK a valuable tool for dissecting inflammasome signaling, programmed cell death pathways, and inflammatory responses in diverse biological systems.
Inflammasome Research: In the context of innate immunity, Z-WEHD-FMK is extensively utilized to study the activation and regulation of inflammasome complexes. By selectively inhibiting caspase-1 activity, researchers can delineate the specific contribution of this protease to the processing and secretion of key cytokines, such as interleukin-1β. This enables detailed investigation into the molecular mechanisms underlying inflammation and the cellular response to pathogenic stimuli, facilitating the identification of novel regulatory nodes within the inflammasome pathway.
Pyroptosis Studies: The compound serves as a critical reagent for exploring the role of caspase-1 in pyroptosis, a form of programmed cell death associated with inflammatory signaling. Through its ability to irreversibly inhibit caspase-1, Z-WEHD-FMK allows investigators to distinguish between caspase-1-dependent and independent cell death pathways. This supports the characterization of the molecular events that drive pyroptotic responses in immune and non-immune cells, advancing understanding of cell fate decisions during infection or tissue injury.
Cytokine Maturation Analysis: Z-WEHD-FMK is widely employed in studies focused on the post-translational processing of pro-inflammatory cytokines. By blocking the proteolytic activity of caspase-1, the inhibitor prevents the conversion of precursor forms of cytokines such as pro-IL-1β and pro-IL-18 into their biologically active counterparts. This enables researchers to assess the dynamics of cytokine maturation and release, as well as to clarify the downstream effects of inflammasome activation on immune signaling networks.
Cellular Signaling Pathway Dissection: The specificity and irreversible binding of Z-WEHD-FMK make it a powerful tool for dissecting complex signaling pathways that converge on caspase-1. Its application in cell-based assays and biochemical experiments allows for precise temporal control over caspase-1 inhibition, facilitating the mapping of upstream and downstream events in inflammatory cascades. This is particularly valuable for distinguishing caspase-1-dependent effects from those mediated by other proteases or signaling molecules within the broader context of immune regulation.
Drug Discovery and Screening: In pharmaceutical and academic research, Z-WEHD-FMK is frequently incorporated into high-throughput screening platforms and mechanistic studies aimed at identifying novel modulators of the inflammasome-caspase-1 axis. By providing a reliable means to inhibit caspase-1 activity, the compound supports the validation of target engagement and the assessment of candidate molecules with potential anti-inflammatory properties. Its use streamlines the evaluation of small molecules, peptides, or biologics designed to modulate innate immune responses, thereby accelerating the development of next-generation research tools and therapeutic candidates for inflammatory disorders.
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