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• W1988271504 endingPage "260" @default.
• W1988271504 startingPage "250" @default.
• W1988271504 abstract "The circulating concentration of insulin-like growth factor-I (IGF-I) is regulated by both its rate of synthesis and its ability to form stable complexes with IGF-binding proteins (IGFBPs). An equilibrium between IGF-I and IGFBPs is thought to help maintain muscle protein balance. In contrast, catabolic conditions disrupt the IGF system and result in the loss of skeletal muscle protein. We have examined the mechanisms by which tumour necrosis factor alpha (TNFalpha), a catabolic cytokine, alters the IGF system. Conscious rats were infused intravenously with recombinant human TNFalpha or vehicle for 24 h. TNFalpha decreased the concentration of both total and free IGF-I in the plasma (30-40%). This change was associated with a reduction in IGF-I mRNA expression in liver (39%), gastrocnemius (73%), soleus (46%) and heart (63%), but a 2.5-fold increase in the whole kidney. In contrast, TNFalpha did not alter IGF-II mRNA expression in skeletal muscle. TNFalpha also increased IGFBP-1 in the blood (4-fold) and this response was associated with an increase in IGFBP-1 mRNA expression in both liver (3-fold) and kidney (9-fold). In contrast, IGFBP-3 levels in the blood were reduced 38% in response to the infusion of TNFalpha. This change was accompanied by a 60-80% reduction of IGFBP-3 mRNA in liver and kidney but no significant change in muscle. Hepatic mRNA levels of the acid-labile subunit were also reduced by TNFalpha (46%). Finally, tissue expression of mac25 (also referred to IGFBP-related protein-1) mRNA was increased in gastrocnemius (50%) but remained unchanged in liver and kidney. These results more fully characterize the changes in various elements of the IGF system and, thereby, provide potential mechanisms for the alterations in the circulating IGF system as well as for changes in tissue metabolism observed during catabolic insults associated with increased TNFalpha expression." @default.
• W1988271504 created "2016-06-24" @default.
• W1988271504 creator A5019544714 @default.
• W1988271504 creator A5048378734 @default.
• W1988271504 creator A5073807348 @default.
• W1988271504 date "2001-08-01" @default.
• W1988271504 modified "2023-09-26" @default.
• W1988271504 title "Tissue-specific regulation of IGF-I and IGF-binding proteins in response to TNFα" @default.
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• W1988271504 doi "https://doi.org/10.1054/ghir.2001.0233" @default.
• W1988271504 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11735242" @default.
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