Sed PNGR.C: plasma insulin concentration at 0, 5, 15, 30, 60, and 120 min after an intravenous glucose challenge is shown in Ex and Sed says in individual graphs (graph 1, CON;graph 2, PNGR;graph 3, IUGR;graph 4, IUGR + PNGR). nonresponsive to insulin. Early introduction of regular Ex in the pregestational female offspring had a positive effect on hepatic adaptation to GSIR and HGP in IUGR and IUGR + PNGR, with no effect in PNGR. Change in insulin responsiveness of SKM GLUT4 translocation was observed in exercised IUGR + PNGR and PNGR but not in exercised IUGR. Keywords:glucose tolerance test, metabolic programming, glucose transporter 4, insulin-responsive glucose transporter 4 translocation restriction of early growthprenatally or postnatally is usually linked to adult-onset insulin resistance, visceral adiposity, and type 2 diabetes mellitus (T2DM) (14). Animal models consisting of fetal and/or postnatal malnutrition as either global (19,36,41) or selective nutrient restriction (17) FLJ12894 causing intrauterine growth restriction (IUGR) and/or postnatal growth restriction (PNGR) predispose the adult offspring to selective tissue-specific insulin resistance (17,19,36). Prenatal nutrient restriction with IUGR enhances glucose-induced insulin response (19) and causes hyperinsulinemia (17,19), hepatic insulin resistance per hyperglycemic euglycemic clamp experiments (22), and insulin resistance of skeletal muscle (SKM) (32,41) and adipose tissue (17) GLUT4 translocation. In contrast, postnatal nutrient restriction (PNGR) programs adult females toward unsuppressed hepatic glucose production, hypoinsulinemia with a lean body habitat, and relative hepatic insulin resistance (19) but partially retained insulin sensitivity of SKM GLUT4 translocation (41). The glucose metabolic adaptations and this insulin-resistant phenotype in the IUGR (19,22) are transgenerationally inherited and amplified in the next generation (7,9,39). Acute exercise or endurance training lowers circulating insulin concentrations and increases counterregulatory hormones. Exercise overcomes glucose intolerance by attenuating hepatic glucose production via suppression of glycogenolysis (13) and enhancing SKM glucose utilization (5,11). Exercise improves insulin sensitivity by augmenting insulin signaling and non-insulin-mediated option signaling mechanisms (37). Exercise and muscle contraction overcome insulin resistance by increasing adenosine 5-monophosphate kinase (AMPK) enzyme activity that in turn increases cellular glucose uptake. This occurs by AMPK-mediated SKM GLUT4 translocation Fluzinamide to the plasma membrane (PM), thereby circumventing the Fluzinamide insulin resistance of GLUT4 translocation (20). On the basis of this information, we hypothesized that early introduction of submaximal exercise training (ET) will ameliorate certain forerunning features of selective insulin resistance in the adult IUGR and/or PNGR pregestational female offspring. To test this hypothesis, we subjected postweaned IUGR or PNGR female rats to a moderate exercise regimen for 6 wk and decided its effect on hepatic glucose kinetics and SKM subcellular GLUT4 protein distribution. == RESEARCH DESIGN AND METHODS == == Animals == Sprague-Dawley rats (Charles River Laboratories, Hollister, CA) were housed in individual cages, exposed to 12:12-h light-dark cycles at 2123C, and allowed ad libitum access to standard rat chow (composition carbohydrate 63.9%, fat 4.5%, and protein 14.5%). The National Institutes of Health guidelines were followed as approved by the Animal Research Committee of the University of California Los Angeles. == Maternal Nutrient Restriction Model == Pregnant rats received 50% of their daily food intake (11 g/day) beginning fromday 11throughday 21of gestation, which constitutes mid- to late gestation, compared with their control (CON) counterparts that received ad libitum access to rat chow (22 g/day). Both groups had ad libitum access to drinking water. At birth, the litter size was culled to six to ensure no interlitter nutritional variability. Postnatally, the cross-fostering of animals generated four experimental groups, as described previously by us (19). Briefly, the newborn pups given birth to to ad libitum feeding CON mothers were reared either by mothers on seminutrient restriction from PN1PN21 (PNGR) or by CON mothers (Fig. 1A). The intrauterine semi-nutrient-restricted progeny was fed either by CON mothers with ad libitum access to nutrients representing intrauterine nutrient restriction (IUGR) alone or Fluzinamide by semi-nutrient-restricted mothers representing a combination of intrauterine and postnatal nutrient restriction (IUGR + PNGR) (Fig. 1A). After being weaned from the mother, all animals had ad libitum access to food and water. == Fig. 1. == A: study design demonstrating the control (CON) group and nutrient restriction achieved by cross-fostering postnatal rat pups. Nutrient-restricted mothers received 50% of daily nutrient intake from mid- to late pregnancy [embryonicdays 11(e11) to21(e21)] through lactation [postnataldays 1(PN1) to21(PN21)].B: experimental protocol for Fluzinamide exercise (Ex) in 4 groups is shown. The CON and nutrient-restricted groups of animals either underwent supervised exercise or Fluzinamide remained sedentary (Sed) from PNday 21(d21) to PNday 60(d60) (2 mo). Ad lib, ad libitum; IUGR, intrauterine growth restricted; PNGR, postnatal growth restricted. == Moderate ET == Postweaned animals in all four groups.