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- W2060168299 abstract "To clarify the role of insulin-like growth factor (IGF)-binding protein-2 (IGFBP-2) in postnatal growth regulation, we crossed hemizygous CMV-IGFBP-2 transgenic mice with hemizygous PEPCK-bGH transgenic mice, which are characterized by serum GH levels in the range of 2 microgram/ml. Four genetic groups were obtained: animals carrying both transgenes (GB), the GH (G) or the IGFBP-2 transgene (B), and nontransgenic controls (C). Male offspring were analyzed for serum levels of IGF-I, for serum and tissue levels of IGFBP-2, and for body and organ growth. Serum IGF-I levels were 2- to 3-fold increased (P < 0.001) in the GH-overexpressing groups, with no difference between G and GB mice. Serum IGFBP-2 levels were 4- to 9-fold (P < 0.001) increased both in B and GB vs. C and G mice. Western immunoblot analysis did not reveal differences in tissue IGFBP-2 levels between B and GB mice. IGFBP-2 levels were highest in pancreas, followed by skeletal muscle, heart, kidney, brain, skin, and spleen. No elevation of IGFBP-2 was found in the liver. Body weight gain of G and GB mice was significantly increased vs. C and B mice, resulting in almost 2-fold increased body weights at the age of 15 weeks. However, there was a significant reduction in body weight of GB vs. G mice (17%; P < 0.001) and of B vs. C mice (13%; P < 0.05). This was primarily caused by a marked reduction of carcass weight (GB vs. G, 27%; B vs. C, 21%; P < 0.001). Measurements of nose-rump-length, organ (brain, heart, spleen, liver, pancreas, kidney), and tissue weights (skin, carcass, abdominal fat) in 5- and 15-week-old mice revealed several indications that the growth-inhibiting effect of IGFBP-2 overexpression was more marked in high-GH/IGF-I mice: 1) At 5 weeks of age, GB mice displayed a significant reduction of all growth parameters except for the weight of abdominal fat, when compared with G mice, whereas only brain weight was significantly reduced in B vs. C mice. 2) In 15-week-old animals, a significant reduction in all growth parameters, except for spleen and abdominal fat weights, was seen in GB vs. G mice, whereas only nose-rump-length and the weights of carcass and brain were significantly reduced in B vs. C mice. Our study demonstrates, for the first time, the potential of IGFBP-2 to inhibit GH-stimulated growth in giant transgenic mice, providing further evidence for an inhibitory effect of this IGFBP in vivo." @default.
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- W2060168299 date "2001-05-01" @default.
- W2060168299 modified "2023-09-28" @default.
- W2060168299 title "Growth Inhibition in Giant Growth Hormone Transgenic Mice by Overexpression of Insulin-Like Growth Factor-Binding Protein-2" @default.
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- W2060168299 doi "https://doi.org/10.1210/endo.142.5.8149" @default.
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