Background: Muscle weakness in septic patients is a serious problem as it complicates and lengthens hospital stays, delays rehabilitation and generates costs. We established a new chronic sepsis model in rats suitable for studying prolonged sepsis and its neuromuscular effects. This study, therefore, examined the effects of a chronic sepsis with Escherichia coli (E.coli) on body weight, muscle mass, clinical markers and the expression of acetylcholine receptors (AChRs). Methods: After approval, a catheter was implanted into the external jugular vein of anesthetized Sprague Darwley rats. A dose of 3,2*108 colony forming units (CFU) E. coli bacteria was injected the catheter, which was subsequently sealed and tunneled subcutaneously. At 3, 7 and 14 days following infection, whole blood was withdrawn and both tibialis cranialis, gastrocnemius and soleus muscles were harvested, weighed and snap frozen for later analysis. Serum levels of acute phase protein, α1-acid glycoprotein (α1–AGP), were measured as a parameter of inflammation. AChRs were quantitated using the 125I-bungarotoxin binding method. Results: E.coli infection caused a significant decrease in body and muscle weight compared to their time-matched controls. The induced infection led to leukocytosis and thrombocytopenia at day 3. Plasma-concentrations of α1 -AGP were elevated by day 3, and stayed significantly high until day 14. Expression of AChRs was not different among groups. Conclusion: We demonstrated that the intravenous injection of E.coli bacteria over a central venous line induces the typical clinical signs of a chronic sepsis on body weight, muscle mass and α1 – AGP. The observed muscle weakness is not due to up-regulated AChRs. Our result therefore, support the notion that general catabolism and muscle wasting is a major factor of neuromuscular dysfunction during sepsis.
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Background: Muscle weakness in septic patients is a serious problem as it complicates and lengthens hospital stays, delays rehabilitation and generates costs. We established a new chronic sepsis model in rats suitable for studying prolonged sepsis and its neuromuscular effects. This study, therefore, examined the effects of a chronic sepsis with Escherichia coli (E.coli) on body weight, muscle mass, clinical markers and the expression of acetylcholine receptors (AChRs). Methods: After approval,...
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