147859-80-1

CA-074 methyl ester is a cell-permeable cathepsin B inhibitor.

ca-074 me is a membrane-permeable and selective inhibitor of cathepsin b with ic50 value of 36.3 nm [1, 2].ca-074 me is a methyl ester derivative of ca-074. in cultured human gingival fibroblasts, ca-074 me exerted a 95% inhibition of cathepsin b and partial inhibition (54%) of the combined activities of cathepsins b and l. ca-074 me was also found to inhibit cathespin l under reducing conditions. it inhibited the activity of purified human cathepsin l by more than 90% when the enzyme had been pre-incubated with 1.4 mm dtt or 4.2 mm gsh for 2 hours. besides that, ca-074 me completely inhibited cathepsin b in the presence of 1.4 mm dtt [2, 3].

CA-074 methyl ester is a cell-permeable analog of CA-074. It is an inhibitor of cathepsin B especially the intracellular type. and undergoes intracellular transition into active CA-074 by the action of esterases. CA-074 methyl ester also inhibits cathepsin L.

cathepsin B

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[1] wu x, zhang l, gurley e, et al. prevention of free fatty acid–induced hepatic lipotoxicity by 18β-glycyrrhetinic acid through lysosomal and mitochondrial pathways. hepatology, 2008, 47(6): 1905-1915.
[2] steverding d. the cathepsin b-selective inhibitors ca-074 and ca-074me inactivate cathepsin l under reducing conditions. open enzyme inhibition journal, 2011, 4: 11-16.
[3] buttle d j, murata m, knight c g, et al. ca074 methyl ester: a proinhibitor for intracellular cathepsin b. archives of biochemistry and biophysics, 1992, 299(2): 377-380.