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• W2079605750 abstract "Linear growth retardation is common in uncontrolled insulin-deficient diabetes, but individual organs such as kidney may hypertrophy. To explore whether this heterogeneity of response might be mediated by differential local insulin-like growth factor-I (IGF-I) gene regulation, we injected rats with ip saline, 65, 120, or 175 mg/kg streptozotocin (STZ). Diabetics were untreated or received daily insulin. Animals were killed 24, 48, or 72 h after documentation of diabetes, and liver, kidney, and lung messenger RNA (mRNA) content analyzed by solution hybridization/RNase protection assay. Untreated diabetics had 10- to 100-fold reductions in hepatic IGF-I mRNA apparent as early as 24 h, and the magnitude of these changes varied directly with the severity of diabetes. In contrast, kidney IGF-I mRNA content increased by 400-500% at 24 h in untreated diabetics given 175 mg/kg STZ, and by 100-200% at 48 h in those given 120 mg/kg STZ, with return to control levels by 72 h. Renal IGF-I mRNA levels actually decreased by 250-350% at 24 h in rats injected with 65 mg/kg STZ, returning to supranormal values by 72 h. These results suggest that severity and/or duration of the metabolic abnormality qualitatively and quantitatively affect this response in the kidney. Liver and kidney IGF-I mRNA levels approached normal with insulin therapy and were similar to controls in rats which received STZ but did not develop diabetes. Lung IGF-I mRNA levels were minimally altered in all experimental groups. At the time point and STZ dosage at which liver IGF-I mRNA changes were most dramatic, little change in liver alpha-tubulin mRNA was noted. At the time point and STZ dosages at which kidney IGF-I mRNA induction was most dramatic, renal IGF-I receptor mRNA was only minimally changed, and renal alpha-tubulin mRNA was modestly reduced. In summary: 1) hepatic IGF-I mRNAs are dramatically reduced, and renal IGF-I mRNAs are significantly increased soon after the onset of insulin-deficient diabetes in STZ-treated rats; 2) insulin therapy restores IGF-I mRNA levels toward normal; and 3) these changes in IGF-I mRNA content are specific and are not the result of hepatic or renal STZ toxicity. These data suggest that IGF-I gene expression is regulated in a discordant, organ-specific manner in diabetes, and that metabolic factors in addition to GH may differentially modulate the endocrine and paracrine effects of IGF-I on growth." @default.
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• W2079605750 date "1993-02-01" @default.
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• W2079605750 title "Discordant, organ-specific regulation of insulin-like growth factor-I messenger ribonucleic acid in insulin-deficient diabetes in rats." @default.
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• W2079605750 doi "https://doi.org/10.1210/endo.132.2.8425471" @default.
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