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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.
3-Epiursolic Acid is a triterpenoid compound that functions as a competitive inhibitor of cathepsin L, demonstrating an IC50 value of 6.5 μM and a Ki value of 19.5 μM. This compound exhibits selectivity for cathepsin L without significantly affecting cathepsin B. Its inhibitory properties make it valuable for research into protease inhibition and related biological pathways.
Cathepsin G is a potent agonist that targets human platelets, stimulating their activation and promoting aggregation. This enzyme plays a crucial role in hemostasis and inflammatory responses. It is valuable for research applications involving platelet biology and can be utilized in the screening of potential inhibitors that modulate platelet function.
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Synonyms: Z-FR-AMC
N-CBZ-Phe-Arg-AMC is a specific substrate for lysosomal cathepsin enzymes, primarily utilized for assessing cathepsin activity. This compound exhibits fluorescent properties upon substrate cleavage, making it suitable for monitoring lysosomal protease activity in various biological samples. Its applications extend to studies on proteolytic processing and the role of cathepsins in cellular functions and disease states.
Z-Phe-Tyr(tBu)-diazomethylketone is a potent inhibitor of cathepsin L, an enzyme involved in various cellular processes. This compound has been shown to facilitate the disassembly of reovirus, thereby reducing viral detection levels. It serves as a valuable tool in research applications targeting viral infections and evaluating the role of cathepsin L in disease mechanisms.
Z-Arg-Arg-βNA acetate is a selective dipeptide substrate for the protease Cathepsin B, exhibiting resistance to proteases H and L. This compound plays a crucial role in differentiating Cathepsin B from other proteases, making it a valuable tool for research focused on protease activity and function. Its sensitivity allows for precise monitoring of Cathepsin B activity in various biological assays.
Gü2602 is a highly selective, reversible inhibitor of cathepsin K (CatK) with a Ki value of 0.013 nM for mature CatK (mCatK). This compound effectively inhibits the autocatalytic activation of the cathepsin K zymogen, making it a valuable tool for studying osteoclastogenesis and bone resorption. Gü2602 is applicable in research areas focused on osteoporosis, cancer metastasis, and other diseases related to abnormal bone remodeling.
GSK-2793660 free base is an oral, irreversible inhibitor of Cathepsin C (CTSC). This compound exhibits potent inhibitory activity, making it a valuable tool for researching conditions linked to CTSC, such as bronchiectasis. Its unique mechanism of action enables the exploration of therapeutic strategies targeting CTSC in various pathological settings.
Cathepsin K is a cysteine protease that exhibits endopeptidase and collagenolytic activities. It plays a crucial role in the degradation of collagen in bone tissue, making it a significant target in osteoporosis research. Studies of Cathepsin K contribute to understanding bone remodeling processes and the development of therapeutic strategies for bone-related diseases.
Arg-Arg-AMC is a selective substrate for Cathepsin B, an enzyme implicated in various cancer progression pathways. This reagent is valuable for assessing Cathepsin B activity in cancer cell models, where its expression is associated with invasive and metastatic characteristics. Its application in research can facilitate the investigation of tumor biology and potential therapeutic targets related to Cathepsin B.
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Z-DEVD-CMK is an irreversible inhibitor targeting cathepsins, demonstrating potent activity against various cathepsin isoforms in vitro. This compound is utilized in research to study the role of cathepsins in apoptosis, inflammation, and cancer progression. It serves as a valuable tool for elucidating the functional mechanisms of cathepsins in biological systems.
Synonyms: RWJ-355871
JNJ-10311795 is a potent dual inhibitor targeting neutrophil cathepsin G (Ki = 38 nM) and mast cell chymase (Ki = 2.3 nM). This compound demonstrates significant anti-inflammatory properties, making it valuable for research aimed at elucidating the roles of these proteases in inflammatory diseases. Its specificity and efficacy render it suitable for studies focused on developing therapeutics for conditions associated with excessive inflammation.
Synonyms: 1-Naphthalenesulfonyl-Ile-Trp-CHO
Cathepsin L-IN-4 is a potent inhibitor of cathepsin L, demonstrating an IC50 in the nanomolar range. This compound effectively attenuates the activity of cathepsin L, which is involved in various pathological processes, including cancer progression and inflammatory responses. Cathepsin L-IN-4 can be utilized in research applications aimed at elucidating the role of cathepsin L in disease models and therapeutic interventions.
Z-Leu-Leu-Arg-AMC is a synthetic peptide substrate specifically designed for cathepsin S. This compound serves as a fluorogenic substrate, enabling the measurement of cathepsin S activity in various biological samples. It is utilized in research applications focusing on protease activity, cellular degradation processes, and the study of lysosomal function and related diseases.
SSAA09E1 is a selective inhibitor of cathepsin L, with an IC50 of 5.33 μM. This compound effectively blocks critical stages of viral entry and has been employed in research focused on SARS-CoV infection. Its role in modulating cathepsin L activity makes it a valuable tool for investigating therapeutic strategies against viral pathogens.
Z-Phe-Phe-Diazomethylketone is a selective inhibitor of cathepsin L, a cysteine protease involved in various cellular processes. This compound exhibits significant inhibitory activity toward cathepsin L, making it valuable in studies related to protein degradation, apoptosis, and various pathological conditions such as cancer and inflammation. It is useful for research applications that require modulation of proteolytic pathways involving cathepsins.
Cathepsin K inhibitor 6 is a potent small molecule specifically targeting cathepsin K (Cat K) with an IC50 value of 17 nM. In addition to its primary activity, it also demonstrates inhibitory effects on cathepsin L and cathepsin B, with IC50 values of 0.05 μM and 0.3 μM, respectively. This compound is valuable for studying bone resorption, fibrosis, and various pathological conditions associated with cathepsin activity.
Leupeptin is a membrane-permeable broad-spectrum protease inhibitor that effectively targets serine, cysteine, and threonine proteases. This compound has been shown to inhibit the main protease of SARS-CoV-2 (Mpro) while also exhibiting anti-inflammatory properties. Leupeptin is valuable for research applications involving proteolytic processes and can aid in the study of viral infections and inflammatory responses.
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Cathepsin D and E FRET Substrate is a fluorogenic substrate specifically designed for the selective detection of cathepsins D and E, avoiding interaction with cathepsins B, H, and L. Cleavage occurs at the Phe-Phe amide bond, releasing a fluorescent signal that can be quantitatively measured. This substrate is ideal for routine assays and mechanistic studies, facilitating the investigation of cathepsin activity in various biological contexts.
Ac-Glu-Asp(EDANS)-Lys-Pro-Ile-Leu-Phe-Phe-Arg-Leu-Gly-Lys(DABCYL)-Glu-NH2 is a specific substrate for cathepsin D, designed for use in fluorescence resonance energy transfer (FRET) assays. This compound exhibits key biological activity by releasing a detectable fluorescence signal upon cathepsin D cleavage, facilitating the study of proteolytic activity. It is valuable for investigating the role of cathepsin D in various biological processes and for screening potential inhibitors in drug development.
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Z-Leu-Tyr-Chloromethylketone is a potent inhibitor of cathepsins, a family of cysteine proteases involved in various cellular processes. This compound exhibits significant inhibitory activity, making it valuable for studies related to protein degradation and apoptotic signaling pathways. It is applicable in research exploring the roles of cathepsins in diseases such as cancer and neurodegeneration.
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MK 1256 is a highly selective and orally active inhibitor of cathepsin K (Cat K) with an IC50 value of 0.62 nM. It demonstrates exceptional selectivity towards other tissue proteases, being over 1100 times more selective, and shows a moderate selectivity for cathepsin F (Cat F) at 110 times. MK 1256 effectively inhibits bone resorption in ovariectomized rhesus monkeys, making it a valuable tool for osteoporosis research.
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Suc-Val-Pro-Phe-pNA functions as a substrate specifically for cathepsin G. This compound allows for the quantitative assessment of cathepsin G activity, which is crucial for understanding its role in various physiological and pathological processes. Its application includes enzyme activity assays in research focused on inflammation, immune response, and other related biological pathways.
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Cathepsin K inhibitor 2 is a selective inhibitor targeting cathepsin K, a cysteine protease implicated in collagen degradation and bone remodeling. Inhibition of cathepsin K is particularly relevant in the study of osteoporosis and osteoarthritis, as it plays a crucial role in these conditions. This compound provides a valuable tool for researchers investigating the molecular mechanisms underlying bone-resorptive diseases and developing potential therapeutic strategies.
RKLLW-NH2 is a selective inhibitor of Cathepsin L, a cysteine protease involved in various physiological and pathological processes. This compound exhibits significant inhibitory activity, making it a valuable tool for research focused on cancer, inflammation, and autoimmune diseases. RKLLW-NH2 may aid in elucidating the role of Cathepsin L in different biological pathways and conditions.
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Ac-Leu-Val-Lys-Aldehyde is a highly effective inhibitor of cathepsin B, demonstrating an IC50 of 4 nM. This compound exhibits significant neuroprotective activity by reducing quinolinic acid-induced striatal cell death and promoting the accumulation of LC3-II, a marker associated with autophagy. It serves as a valuable tool for investigating the role of cathepsin B in various biological processes and potential therapeutic strategies for neurodegenerative diseases.
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