PMID: 9640347Jun 26, 1998Paper

Sustained modifications of protein metabolism in various tissues in a rat model of long-lasting sepsis

Clinical Science
Denis BreuilléC Obled

Abstract

1. Sepsis was induced in rats by an intravenous injection of live bacteria. Infected and pair-fed animals were studied before the infection, in an acute septic phase (day 2 post-infection), in a chronic septic phase (day 6) and in a late septic phase (day 10). Protein synthesis rates were measured in vivo after administration of a flooding dose of L[1-13C]valine. 2. During the acute phase, muscle protein loss associated with infection resulted from both a decrease in protein synthesis and an increase in proteolysis. During the chronic phase and the late phase, the increase of proteolysis in infected rats as compared with pair-fed animals persisted, worsening muscle atrophy. Skin protein synthesis rates were not significantly modified by infection. However, skin protein content decreased 6 and 10 days after infection, suggesting an increased proteolysis in response to sepsis. 3. Protein synthesis in liver of infected rats was twice that of pair-fed animals. Liver protein synthesis remained elevated in infected rats compared with pair-fed animals until day 10. Hypoalbuminaemia and high plasma concentrations of fibrinogen were evident at all periods studied. alpha 2-Macroglobulin and alpha 1-acid glycoprotein reached peak concentr...Continue Reading

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