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. 1996 Apr 2;93(7):2714–2718. doi: 10.1073/pnas.93.7.2714

Increased mRNA levels for components of the lysosomal, Ca2+-activated, and ATP-ubiquitin-dependent proteolytic pathways in skeletal muscle from head trauma patients.

O Mansoor 1, B Beaufrere 1, Y Boirie 1, C Ralliere 1, D Taillandier 1, E Aurousseau 1, P Schoeffler 1, M Arnal 1, D Attaix 1
PMCID: PMC39696  PMID: 8610106

Abstract

The cellular mechanisms responsible for enhanced muscle protein breakdown in hospitalized patients, which frequently results in lean body wasting, are unknown. To determine whether the lysosomal, Ca2+-activated, and ubiquitin-proteasome proteolytic pathways are activated, we measured mRNA levels for components of these processes in muscle biopsies from severe head trauma patients. These patients exhibited negative nitrogen balance and increased rates of whole-body protein breakdown (assessed by [13C]leucine infusion) and of myofibrillar protein breakdown (assessed by 3-methylhistidine urinary excretion). Increased muscle mRNA levels for cathepsin D, m-calpain, and critical components of the ubiquitin proteolytic pathway (i.e., ubiquitin, the 14-kDa ubiquitin-conjugating enzyme E2, and proteasome subunits) paralleled these metabolic adaptations. The data clearly support a role for multiple proteolytic processes in increased muscle proteolysis. The ubiquitin proteolytic pathway could be activated by altered glucocorticoid production and/or increased circulating levels of interleukin 1beta and interleukin 6 observed in head trauma patients and account for the breakdown of myofibrillar proteins, as was recently reported in animal studies.

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