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- W4230911071 abstract "Alteration of skeletal muscle protein breakdown is a hallmark of a set of pathologies, including sepsis, with negative consequences for recovery. The aim of the present study was to search for muscle markers associated with protein loss, which could help in predicting and understanding pathological wasting. With the use of differential display reverse transcription-PCR, we screened differentially expressed genes in muscle from septic rats in a long-lasting catabolic state. One clone was isolated, confirmed as being overexpressed in septic skeletal muscle and identified as encoding the lysosomal cysteine endopeptidase cathepsin L. Northern- and Western-blot analysis of cathepsin L in gastrocnemius or tibialis anterior muscles of septic rats confirmed an elevation (up to 3-fold) of both mRNA and protein levels as early as 2 days post-infection, and a further increase 6 days post-infection (up to 13-fold). At the same time, the increase in mRNAs encoding other lysosomal endopeptidases or components of the ubiquitin–proteasome pathway did not exceed 4-fold. Cathepsin L mRNA was also increased in tibialis anterior muscle of rats treated with the glucocorticoid analogue, dexamethasone, or rats bearing the Yoshida Sarcoma. The increase in cathepsin L mRNA was reduced by 40% when the tumour-bearing animals were treated with pentoxifylline, an inhibitor of tumour necrosis factor-α production. In conclusion, these results demonstrate a positive and direct correlation between cathepsin L mRNA and protein level and the intensity of proteolysis, and identify cathepsin L as an appropriate early marker of muscle wasting. Cathepsin L presumably participates in the pathological response leading to muscle loss, with glucocorticoids and tumour necrosis factor-α potentially being involved in the up-regulation of cathepsin L." @default.
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- W4230911071 date "2001-11-08" @default.
- W4230911071 modified "2023-10-09" @default.
- W4230911071 title "Identification of cathepsin L as a differentially expressed message associated with skeletal muscle wasting" @default.
- W4230911071 doi "https://doi.org/10.1042/bj3600143" @default.
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