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This study was conducted to assess the effect of the leucine metabolite, 3-hydroxy-3-methylbutyrate (HMB) on animal performance, and also cathepsins and calpain II activities in the gastrocnemius muscle in young rats undergoing dexamethasone (DX) treatment and subsequent recovery. Five days of DX administration resulted in an increase in calpain activity. During 5 days of recovery alone, calpain activity...
The process of bone resorption by osteoclasts involves the dissolution of mineral salts and enzymatic degradation of the mainly collagenous extracellular matrix. Cysteine proteinases, which can efficiently degrade collagen at acidic pH, have been suggested to play an important role in the bone resorptive process. The cysteine proteinase cathepsin L is secreted by osteoclasts, and inhibitors of this...
Intoxication of rats with methanol (1.5 and 3.0 g/kg body weight) led to a significant, time- and dose-dependent decrease in the activities of cathepsins A, B and C, while the activity of cathepsin D was unaffected. The decrease was associated with a different partial release of individual cathepsins to the post-lysosomal fraction.
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