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Cathepsin inhibitors act on lysosomal proteases, mainly the papain-like cysteine cathepsins B, C, K, L and S. Cysteine cathepsins degrade proteins in the endolysosomal system and, after secretion, also remodel the extracellular matrix. In 1996 loss of cathepsin K was shown to cause pycnodysostosis, a lysosomal disease with dense, brittle bones. Cathepsin K is the main collagen-degrading protease of osteoclasts, which makes it a target in bone resorption studies. Odanacatib and balicatib inhibit cathepsin K, petesicatib targets cathepsin S, and CA-074 is selective for cathepsin B. CA-074 methyl ester is a membrane-permeable form for work in intact cells. Gly-Phe-beta-naphthylamide, a cathepsin C substrate, is used to rupture lysosomes in live cells.
Cathepsin C-IN-4 is a selective inhibitor targeting Cathepsin C, demonstrating a potent inhibitory activity with an IC50 of 65.6 nM. In addition to its primary action, Cathepsin C-IN-4 exhibits significant inhibition in THP-1 and U937 cell lines with IC50 values of 203.4 nM and 177.6 nM, respectively. This compound is valuable for studies exploring the role of Cathepsin C in various biological processes and associated diseases.
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Gü1303 is a potent, reversible inhibitor of cathepsin K (CatK) that demonstrates a Ki of 0.91 nM for mature CatK (mCatK). This compound effectively suppresses the autocatalytic activation of the cathepsin K zymogen, making it valuable for studies related to bone resorption and various pathological conditions associated with CatK activity. Gü1303 is suitable for research applications in the fields of enzymology, pharmacology, and disease modeling.
JNJ 10329670 is a selective noncovalent inhibitor of cathepsin S, exhibiting a Ki value of 34 nM for human cathepsin S. This compound effectively inhibits invariant chain proteolysis in B cells and dendritic cells, leading to the modulation of antigen-induced T cell proliferation. It serves as a valuable tool in immunological research and studies focused on autoimmune diseases and cancer immunotherapy.
Cathepsin K Inhibitor 3 is a highly selective inhibitor targeting cathepsin K, demonstrating an IC50 value of 0.5 nM. This compound exhibits a favorable pharmacokinetic profile, making it suitable for research applications in osteoarthritis studies. Its specific action on cathepsin K positions it as a valuable tool in elucidating the role of this enzyme in bone resorption and related conditions.
CLIK-148 is a highly selective, irreversible inhibitor of Cathepsin L, a cysteine protease known for its role in protein degradation. This compound effectively prevents the Cathepsin L-mediated degradation of HMG-CoA reductase within the endoplasmic reticulum and inhibits the processing of proCCK, subsequently reducing CCK8 production. CLIK-148 also impairs the breakdown of type I collagen by osteoclast-secreted Cathepsin L, thereby mitigating tumor-induced bone metastasis and hypercalcemia. This compound is valuable for investigating bone metabolism disorders and neuropeptide processing regulation.
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Z-Arg-Arg-4MβNA triacetate is a specific substrate for cathepsin B, designed to facilitate the study of this cysteine protease. Upon cleavage by cathepsin B, it generates the fluorescent product 4MβNA, which exhibits excitation and emission maxima at 355 nm and 430 nm, respectively. This reagent is useful for investigating enzyme activity and dynamics in various biological research applications.
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Cathepsin L-IN-3 is a selective noncovalent inhibitor of cathepsin L, exhibiting a Ki value of 4.3 nM. This compound effectively modulates cathepsin L activity, making it a valuable tool for studies in cancer biology and inflammation. Its potency and selectivity enable researchers to investigate the role of cathepsin L in various physiological and pathological processes.
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ABP 25 is an activity-based probe specifically designed to inhibit cathepsin K, demonstrating high potency and selectivity. This reagent enables effective imaging of cathepsin K activity, making it a valuable tool for studying diseases where cathepsin K plays a critical role, such as bone resorption and related pathologies. Its application extends to various research fields, including cancer, osteoporosis, and cardiovascular diseases.
SQ 32056 is a potent inhibitor of cathepsin E, an aspartyl protease involved in various biological processes, including immune response and inflammation. This compound effectively obstructs the pressor response to endothelin, making it a valuable tool for research into cardiovascular and inflammatory diseases. Its applications extend to studying the role of cathepsins in pathological conditions and evaluating therapeutic strategies targeting protease-mediated signaling pathways.
GB111-NH2 is a potent cysteine cathepsin inhibitor that plays a crucial role in the modulation of proteolytic activity associated with various pathological conditions, including cancer. Its inhibitory action on cathepsins has made it a valuable tool for researchers investigating tumor progression and metastasis. This compound can facilitate the understanding of cysteine cathepsin's role in cancer biology and aid in the development of targeted therapies.
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BI-1915 is a selective inhibitor of Cathepsin S, exhibiting an IC50 of 17 nM. This compound is valuable for studying the role of Cathepsin S in autoimmune diseases and may aid in the development of therapeutic strategies targeting these conditions. Its specificity makes it a useful tool for dissecting the biological functions of this enzyme in various research applications.
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Cathepsin C-IN-3 is a selective inhibitor of Cathepsin C, demonstrating a potency with an IC50 value of 61.79 nM. This compound effectively inhibits the proliferation of THP-1 and U937 cell lines, with IC50 values of 101.5 nM and 86.5 nM, respectively. Cathepsin C-IN-3 is valuable for studies focused on the role of Cathepsin C in inflammation and immune responses.
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Cathepsin C-IN-7 is a selective inhibitor of Cathepsin C, an enzyme implicated in various inflammatory and cancer-related processes. This compound demonstrates significant biological activity in modulating immune responses and has potential applications in the study of primary cancers and cancer metastases. Researchers can utilize Cathepsin C-IN-7 to investigate the role of Cathepsin C in tumor biology and the progression of malignancies.
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MV061194 is a selective inhibitor of cathepsin K, exhibiting a human Ki of 2.5 nM. This compound is utilized in research focused on osteoporosis, providing insights into bone resorption processes and potential therapeutic strategies for bone-related disorders. Its specificity and potency make it a valuable tool for studying the role of cathepsin K in various biological contexts.
Heterophyllin A is a natural compound that targets cathepsin enzymes. This compound exhibits notable biological activity by inhibiting cathepsin protease activity, making it a valuable reagent for research into proteolytic pathways. Its applications include studies on cellular processes related to protein degradation, as well as potential therapeutic investigations regarding disease states linked to dysregulated cathepsin function.
Z-Arg-Arg-AMC is a selective substrate for cathepsin B, a cysteine protease involved in various physiological and pathological processes. This compound facilitates the measurement of cathepsin B activity through the release of a freely diffusible fluorophore. It is commonly utilized in biochemical assays to study protease activity, including research on cancer, inflammation, and other diseases associated with altered cathepsin levels.
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CAA-0225 is a selective inhibitor of the tissue protease L, specifically targeting TbCATL with an IC50 of 1.9 nM. This compound has demonstrated significant biological activity, including the degradation of autophagosome membrane markers such as LC3-II and GABARAP. Additionally, CAA-0225 improves cardiac function in models of reperfusion injury and exhibits efficacy against Trypanosoma brucei, highlighting its potential applications in cardiovascular research and parasitology studies.
Cathepsin K inhibitor 5 is a selective inhibitor of Cathepsin K, a cysteine protease involved in bone resorption and remodeling. This compound effectively inhibits Cathepsin K activity, making it valuable for studying osteoclast function and bone-related diseases such as osteoporosis. Its use in research can enhance understanding of bone metabolism and aid in the development of novel therapeutic strategies for bone disorders.
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TB-9 is a potent inhibitor of cathepsin D, cathepsin E, and BACE1, exhibiting IC50 values of 0.0783 nM, 0.724 nM, and 54.2 nM, respectively. This compound shows significant potential in the study of neurodegenerative diseases and cancer, where cathepsin activity is implicated. Its ability to selectively target these enzymes makes TB-9 an important tool for researchers investigating the role of proteases in various biological processes.
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Cathepsin K-IN-8 is a potent inhibitor of cathepsin K, an enzyme involved in the degradation of extracellular matrix components. This compound is primarily utilized in research focused on inflammatory diseases such as rheumatoid arthritis and osteoarthritis, as well as conditions like osteoporosis and tumor progression. Its inhibition of cathepsin K allows for the investigation of its role in these pathological processes, making it a valuable tool for studying bone resorption and related disorders.
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Cathepsin E substrate e is a selective substrate for the enzyme Cathepsin E, designed to facilitate monitoring of its proteolytic activity. This substrate employs a close proximity of a Mca donor and a Dnp acceptor to create a near-complete intramolecular quenching effect in its intact form. Upon cleavage by Cathepsin E, the spatial separation of Mca and Dnp generates a significant increase in fluorescence, making it an effective tool for studying Cathepsin E activity and its role in various biological processes.
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BI-1124 is a selective inhibitor of cathepsin S, a cysteine protease involved in various pathological processes, including inflammation and tissue remodeling. This compound demonstrates effective ocular pharmacokinetic-pharmacodynamic properties in rabbit models following topical administration. BI-1124 is primarily utilized in research focused on age-related dry eye disease, making it a valuable tool for exploring therapeutic interventions in ocular health.
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Z-FG-NHO-Bz is a selective inhibitor of cathepsins, a family of cysteine proteases involved in various biological processes. This compound exhibits significant inhibitory activity against cathepsin B and L, making it a valuable tool for studying their roles in pathological conditions such as cancer and neurodegenerative diseases. Z-FG-NHO-Bz is ideal for research applications focused on proteolytic enzyme regulation and therapeutic intervention.
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Dutacatib is a selective inhibitor of cathepsin K with demonstrated antiviral activity against SARS-CoV-2 3CLpro. By inhibiting cathepsin K, it plays a role in ameliorating bone diseases associated with cancer. This compound is valuable for research focused on therapeutic interventions in viral infections and bone-related pathologies in cancer.
Synonyms: Bz-Phe-Val-Arg-pNA
S2160 is a specific substrate for Cathepsin B, designed for use in calorimetric assays. This compound enables the accurate measurement of Cathepsin B activity in various biological samples. Researchers can utilize S2160 to study proteolytic processes and explore the role of Cathepsin B in physiological and pathological conditions.
