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- W2044709442 abstract "Acromegaly is characterized by a hypersecretion of GH, which in turn results in an excess of IGF-I, an important mediator of its actions. IGF-I itself is intimately related to insulin both in structure and function. IGF-I circulates associated with specific binding proteins which appear to have important effects on its activity. We have examined the inter-relations between GH, prolactin, insulin, IGF-I and one of the binding proteins, IGFBP-1, in 62 patients with acromegaly of varying activity. Serum IGF-I levels were closely related to the logarithm of mean GH levels (r = 0.76; n = 62; P less than 0.001) but multiple regression analysis suggested that, after accounting for the variation due to GH, insulin accounted for some of the additional variation of IGF-I. IGF-I concentrations were independent of prolactin. Fasting insulin levels were high and unrelated to mean GH levels but correlated with those of IGF-I (r = 0.542; n = 57; P less than 0.001). This correlation coefficient was further improved by also accounting for variations in IGFBP-1 (r = 0.684; n = 57; P less than 0.001). Even in subjects whose acromegaly was well controlled or cured, as indicated by GH levels of less than 1 mU/l or IGF-I levels of less than 2 U/ml, fasting insulin levels remained significantly elevated in some individuals. The reason for this persistent abnormality is not clear. Fasting IGFBP-1 levels were low and unrelated to mean GH but were inversely related to fasting insulin levels (r = -0.593; n = 57; P less than 0.001). We propose that a cascade of events occurs in acromegaly.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2044709442 date "1991-04-01" @default.
- W2044709442 modified "2023-10-14" @default.
- W2044709442 title "Inter-relations between growth hormone, insulin, insulin-like growth factor-l (IGF-I), IGF-binding protein-1 (IGFBP-1) and sex hormone-binding globulin in acromegaly" @default.
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- W2044709442 doi "https://doi.org/10.1111/j.1365-2265.1991.tb03766.x" @default.
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