Abstract
Sepsis is characterized by a severe shift in metabolism, characterized by low IGF-I levels. We have studied the influence of caecal ligation and puncture (CLP) on the levels of circulating IGF-I and hepatic IGF-I and IGF-binding protein (IGFBP)-1, -2 and -3 mRNA in adult male Wistar rats (n = 12) and compared it with sham-operated rats (n = 6). In order to exclude anorexia-induced changes we also studied animals pair-fed to both groups. IGF-I levels were measured by RIA. Steady-state hepatic IGF-I, IGFBP-1, IGFBP-2 and IGFBP-3 mRNA levels were measured by Northern blot analysis using specific rat cDNA probes. Food intake averaged 13.0 +/- 2.0 g/day in the sham-operated rats fed ad libitum during the study period, with a sharp decline in food intake in the CLP animals (2.3 +/- 1.3 g/day). After CLP, there was a significant reduction in circulating IGF-I levels (467.2 +/- 50.9 micrograms/l) compared with sham-operated animals (924.0 +/- 75.3 micrograms/l; P = 0.04) or those pair-fed to the CLP rats (612.5 +/- 52.9 micrograms/l; P = 0.04). Total hepatic IGF-I mRNA levels were significantly reduced (2.57 +/- 0.05 densitometric units (DU) after CLP compared with the sham-operated group (2.71 +/- 0.04); P = 0.04), or their pair-fed c...Continue Reading
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