Aberrant insulin-induced GLUT4 translocation predicts glucose intolerance in the offspring of a diabetic mother |
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Authors: | Thamotharan M McKnight Robert A Thamotharan Shanthie Kao Doris J Devaskar Sherin U |
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Institution: | Division of Neonatology and Developmental Biology, Department of Pediatrics, David Geffen School of Medicine, University of California, Los Angeles, CA 90095-1752, USA. |
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Abstract: | We examined the long-term effect of in utero exposure to streptozotocin-induced maternal diabetes on the progeny that postnatally received either ad libitum access to milk by being fed by control mothers (CM/DP) or were subjected to relative nutrient restriction by being fed by diabetic mothers (DM/DP) compared with the control progeny fed by control mothers (CM/CP). There was increased food intake, glucose intolerance, and obesity in the CM/DP group and diminished food intake, glucose tolerance, and postnatal growth restriction in the DM/DP group, persisting in the adult. These changes were associated with aberrations in hormonal and metabolic profiles and alterations in hypothalamic neuropeptide Y concentrations. By use of subfractionation and Western blot analysis techniques, the CM/DP group demonstrated a higher skeletal muscle sarcolemma-associated (days 1 and 60) and white adipose tissue plasma membrane-associated (day 60) GLUT4 in the basal state with a lack of insulin-induced translocation. The DM/DP group demonstrated a partial amelioration of this change observed in the CM/DP group. We conclude that the offspring of a diabetic mother with ad libitum postnatal nutrition demonstrates increased food intake and resistance to insulin-induced translocation of GLUT4 in skeletal muscle and white adipose tissue. This in turn leads to glucose intolerance and obesity at a later stage (day 180). Postnatal nutrient restriction results in reversal of this adult phenotype, thereby explaining the phenotypic heterogeneity that exists in this population. |
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