PMID: 11923043Mar 30, 2002Paper

Reduction of insulin-like growth factor-I expression in the skeletal muscle of noncachectic patients with chronic heart failure

Journal of the American College of Cardiology
R HambrechtG Schuler

Abstract

We sought to assess the role of insulin-like growth factor-I (IGF-I) in muscle wasting in chronic heart failure (CHF), serum concentrations and local muscular IGF-I expression were determined in patients with severe CHF. Chronic heart failure is associated with progressive muscle atrophy, leading to cardiac cachexia. Skeletal muscle disuse and inflammatory activation with elevated cytokine levels have been implicated; however, the pathomechanism involved remains largely unknown. Serum levels of IGF-I were measured by competitive solid phase immunoassay in 47 patients with severe CHF (left ventricular ejection fraction < or =30%) and 15 age-matched healthy subjects (HS). Insulin-like growth factor-I and IGF-I receptor expression were assessed in vastus lateralis biopsies by real-time PCR and Western blot analysis. Although serum IGF-I was not significantly different (175 +/- 10 ng/ml in CHF vs. 170 +/- 12 ng/ml in HS, p = NS), local muscle IGF-I mRNA expression was reduced by 52% in CHF (6.7 +/- 0.4 vs. 14.0 +/- 0.9 arbitrary units in HS, p < 0.001). This was accompanied by an increase in IGF-I receptor mRNA expression (86.8 +/- 5.4 in CHF vs. 23.1 +/- 1.8 arbitrary units in HS, p < 0.001). Local IGF-I expression was significant...Continue Reading

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