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• W1770900210 abstract "We have studied the effects of insulin on the bioavailability of insulin-like growth factor (IGF) I in insulin-resistant patients after surgery. Serum levels of total IGF-I (tIGF-I), free IGF (fIGF)-I, fIGF-II, and IGF-binding protein (IGFBP) 1 and IGFBP-3 proteolytic activity (IGFBP-3-PA), determined on the day before surgery and on the 1st postoperative day, were related to insulin sensitivity measured by a hyperinsulinemic, normoglycemic clamp. Before surgery, the decreased tIGF-I (P < 0.05) in response to insulin infusion was accompanied by an 18% reduction of IGFBP-1 (P < 0.001), while IGFBP-3-PA remained unchanged. Levels of fIGF-I and fIGF-II were not changed by insulin infusions. After surgery, IGFBP-3-PA increased (P < 0.05) during insulin infusion, and this was associated with an increase in tIGF-I (P < 0.001) and fIGF-I (P < 0.01), while no significant change was found in fIGF-II. The reduction in IGFBP-1 in response to insulin infusion was not affected by surgery. The change in IGFBP-3-PA during insulin infusion after surgery was related to the corresponding change in fIGF-I (r(2) = 0.26, P < 0.05) and postoperative insulin sensitivity (r(2) = -0.22, P < 0.05). These data suggest that increased IGFBP-3-PA during insulin infusion after surgery governs the increased levels of fIGF-I, while insulin-induced suppression of IGFBP-1 was not affected by surgery. We propose that, in catabolic, postoperative patients, increased levels of insulin from exogenous or, possibly, endogenous sources (nutritionally induced) may be a signal to increase IGF-I bioavailability by increased expression of IGFBP-3-PA to counteract further deterioration in glucose metabolism." @default.
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• W1770900210 date "2001-10-01" @default.
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• W1770900210 title "Insulin infusion increases levels of free IGF-I and IGFBP-3 proteolytic activity in patients after surgery" @default.
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• W1770900210 doi "https://doi.org/10.1152/ajpendo.2001.281.4.e736" @default.
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