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pubmed-article:7825522pubmed:abstractTextIn this study, 20 micrograms.kg.-1.h-1 of recombinant human insulin-like growth factor I (IGF-I) was infused into normal healthy rats to examine the effects of IGF-I on glucose, protein, and energy metabolism in either overnight-fasting or parenteral-feeding states. The fed state was maintained by continuous intravenous feeding of a complete diet containing 838 kJ.kg-1.d-1, 2 g N.kg-1.d-1, and no fat. At each nutritional state, one-half of the animals received IGF-I infusion while the other half received saline as control. [14C-1]leucine and [3H-6]glucose were used to determine the effects of IGF-I on protein and glucose kinetics during fed and fasting states. The results showed that 1) infusion of IGF-I at this amount did not alter plasma glucose appearance and only marginally decreased plasma glucose concentrations in both nutritional states; 2) during fasting, IGF-I did not show anabolic effects on protein metabolism either at the whole-body level or in individual tissues. However, during feeding, IGF-I significantly stimulated exogenous nitrogen utilization by the whole body; and 3) IGF-I reduced the thermogenic effect of feeding. The results suggest that parenteral feeding may be an important variable in the response of protein anabolism to IGF-I in vivo.lld:pubmed
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pubmed-article:7825522pubmed:pagination116-20lld:pubmed
pubmed-article:7825522pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:7825522pubmed:year1995lld:pubmed
pubmed-article:7825522pubmed:articleTitleIGF-I alters energy expenditure and protein metabolism during parenteral feeding in rats.lld:pubmed
pubmed-article:7825522pubmed:affiliationLaboratory of Nutrition/Infection, New England Deaconess Hospital, Harvard Medical School, Boston 02215.lld:pubmed
pubmed-article:7825522pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:7825522pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed