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• W1974014804 abstract "We recently described increased insulin-like growth factor binding protein 3 (IGFBP-3) proteolysis in the circulation in adult Turner syndrome (TS), with normalization during sex hormone replacement therapy (HRT), suggesting the presence of a sex hormone regulated IGFBP-3 proteolytic activity.To study the GH-IGF-IGFBP axis in TS without and during HRT, and to further characterize the nature of the IGFBP-3 proteolytic activity.23 women with TS before and during HRT, and 24 healthy age-matched women.The study included measurements of the acid-labile subunit (ALS), IGFBP-1, -2 and -3 (immunoreactive and Western ligand blot (WLB)), IGFBP-4 (WLB) and IGF-I bioactivity. To determine the molecular distribution of IGFBP-3, serum from patient and controls was subjected to neutral size-exclusion chromatography followed by determination of the IGFBP profile by WLB and immunoassay. Finally, the inhibitor characteristic of in vitro IGFBP-3 proteolytic activity in serum was determined.Immunoreactive IGF-I was normal, while IGF-I bioactivity was decreased in TS. Immunoreactive IGFBP-1, -2 and -3 were normal, while WLB-IGFBPs were all reduced, but increased in response to HRT. The IGFBP-3 ternary complex was significantly reduced in TS, and increased in response to HRT, while the non-ternary complexed IGFBP-3 remained unaffected by treatment. In vitro IGFBP-3 proteolytic activity in serum was abolished by aprotinin, while EDTA and zinc chloride had no inhibitory effects, suggesting the presence of a serine protease. 17beta-estradiol had no direct inhibitory effect on the IGFBP-3 proteolytic activity in vitro. Size-exclusion chromatography showed that the protease had a molecular mass of more than 500 kDa.The GH-IGF-IGFBP axis is profoundly disturbed in TS, with a partly normalizing effect of HRT. A sex hormone-dependent IGFBP-3 proteolytic activity (serine protease) leads to destabilization of the 150 kDa IGFBP-3 ternary complex in TS. During HRT both IGFBP-3 proteolytic activity and ternary complex formation is normalized." @default.
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• W1974014804 date "2006-10-01" @default.
• W1974014804 modified "2023-09-29" @default.
• W1974014804 title "The GH–IGF–IGFBP axis is changed in Turner syndrome: Partial normalization by HRT" @default.
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• W1974014804 doi "https://doi.org/10.1016/j.ghir.2006.09.001" @default.
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