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• W2042034369 abstract "Assay conditions were elaborated to determine the catalytic activity of cathepsin S fluorometrically for direct comparison with the activities of cathepsins B + L(+S) and B along the nephron of the normal rat. These conditions include the use of 0.5 mM Z-Phe-Arg-AMC as substrate, which is saturating for the three enzymes. The stability of cathepsin S at pH 7.5 and the resistance of cathepsin B against inactivation by 0.5 microM Z-Phe-Phe-CHN2 permitted differentiation of these enzyme activities. The catalytic activity of cathepsin S in rat kidney homogenate (1.11 mumol/min x g protein) amounted to 2.1% of that of cathepsins B + L(+S) and to 3.2% of that of cathepsin B. It was ten-fold higher in the cortex (1.54 mumol/min x g protein) than in the medulla resembling the activity ratio of cathepsins B + L(+S) and B. In suspensions of isolated glomeruli and isolated proximal tubules the activities of cathepsin S were 0.76 and 3.21 mumol/min x g protein, respectively. The corresponding activities of cathepsins B + L(+S) amounted to 80.0 and 211.7 mumol/min x g protein consisting of 71% cathepsin B activity. In nephron segments microdissected from lyophilized renal sections, highest cathepsin S activity was found in the proximal convoluted tubules (4.21 mumol/min x g dry weight) followed by 0.83 mumol/min x g dry weight in proximal straight tubules of the superficial cortex. In the remaining segments cathepsin S activity was hardly detectable. Unlike cathepsin S activity, the activity of cathepsin B was distributed in parallel to that of cathepsins B + L(+S). The presence of relatively high cathepsin S activity in proximal convoluted tubules in co-localization with the activities of cathepsins B + L(+S) and B suggests a primary role of these enzymes in heterophagocytosis of proteins from the ultrafiltrate." @default.
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• W2042034369 date "1997-01-01" @default.
• W2042034369 modified "2023-10-17" @default.
• W2042034369 title "Specific Catalytic Activity of Cathepsin S in Comparison to Cathepsins B and L along the Rat Nephron" @default.
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• W2042034369 doi "https://doi.org/10.1515/bchm.1997.378.2.61" @default.
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