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Blood levels of insulin-like growth factors I and II in neonates of non-insulin-dependent diabetic rats

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Abstract

Circulating levels of insulin like growth factor I (IGF-I) and insulin like growth factor II (IGF-II) were evaluated in plasma samples during the first 72 h of life in neonates of diabetic and control mother rats. Diabetes had been induced in the diabetic dams by streptozotocin at 2 days of age. The rats developed non-insulin dependent diabetes (at 6 weeks of age) and became pregnant at 11 weeks of age. Maternal blood glucose levels were higher in the diabetic mothers (P<0.05) during the last two-thirds of gestation. Complications occurred at the end of 7.1% of the diabetic pregnancies but none of the controls. Analysis of neonates plasma glucose, IGF-I, and IGF-II concentrations in the first 12, 24, 48, and 72 h after birth revealed higher glucose levels in neonates of diabetic mothers at 72 h compared with controls (118±7 vs 85±5 mg/dl,P<0.05) but there was no difference in IGF-I or IGF-II levels between the groups at any time point. Thus, acquired impaired glucose homeostasis may be seen in neonates of mildly diabetic mothers at early stages of their life but their circulating insulin-like growth factors levels are normal. These data do not support the proposition that fetal IGF-I and —II affect the outcome of pregnancies complicated by mild diabetes in the rodent.

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Author notes

  1. J. R. Gavin III

    Present address: Howard Hughes Medical Institute, 6071 Rockledge Drive, Bethesda, Maryland, USA

Authors and Affiliations

  1. Division of Endocrinology and Metabolism, Wayne State University School of Medicine, UHC-4H, 4201 St. Antoine, 4820, Detroit, Michigan, USA

    J. Levy

  2. Division of Endocrinology and Metabolism, Washington University School of Medicine, St. Louis, Missouri, USA

    J. R. Gavin III

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  1. J. Levy
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Levy, J., Gavin, J.R. Blood levels of insulin-like growth factors I and II in neonates of non-insulin-dependent diabetic rats. Acta Diabetol 31, 164–168 (1994). https://doi.org/10.1007/BF00570373

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  • DOI: https://doi.org/10.1007/BF00570373

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