Changes in Nocturnal Leptin and Insulin Concentrations in Prepubertal Low Birth Weight Children after Administration of the IGF-I/IGFBP-3 Complex

Background: There is limited information regarding the effects of IGF-I and/or IGFBP-3 on circulating leptin concentrations. Aim: To determine the effects of IGF-I on leptin and insulin concentrations, we examined leptin and insulin nocturnal profiles before and after the administration of the IGF-I/IGFBP-3 complex (Iplex™) to prepubertal, low birth weight children. Methods: We studied 20 prepubertal children (11 boys and 9 girls), born after a full-term pregnancy with a mean birth weight below 2.8 kg. They were studied at the mean age of 7.3 ± 0.5 years (range 4-11 years). Their mean height was-1.8 ± 0.3 SDS and their mean BMI was 0.1 ± 0.2 SDS at the time of the study. The children were studied on 2 separate occasions, the first under basal conditions, and the second time after s.c. administration of 1 mg/kg of Iplex™ at 21.00 h. Blood samples for determination of leptin and insulin were obtained every 60 min between 23.00 h and 07.00 h, while the children were sleeping. In each pat

Longitudinal changes in insulin sensitivity and secretion from birth to age three years in small- and appropriate-for-gestational-age children

Aims/hypothesis: Insulin resistance and type 2 diabetes risk in human subjects who were small-for-gestationalage (SGA) at birth may be a consequence of rapid early postnatal weight gain. Materials and methods: We prospectively studied early changes in fasting insulin sensitivity and insulin secretion, assessed by a short intravenous glucose tolerance test that was conducted several times from birth to 3 years of age in 55 SGA (birthweight below fifth percentile) newborns and in 13 newborns with a birthweight appropriate for gestational age (AGA). Results: Most SGA infants showed postnatal upward weight centile crossing and by 3 years were similar in size to AGA infants. SGA infants had lower pre-feed insulin levels at postnatal age 48 h than AGA infants (median 34.4 vs 59.7 pmol/l, p<0.05), but by the age of 3 years they had higher fasting insulin levels (median 38.9 vs 23.8 pmol/l, p<0.005), which were related to rate of weight gain between 0 and 3 years (r=0.47, p=0.0003). First-phase insulin secretion did not differ between SGA and AGA infants, but SGA infants had a lower glucose disposition index (beta cell compensation) (median 235 vs 501 min mmol−1 l −1 , p=0.02), which persisted after allowing for postnatal weight gain (p=0.009). Conclusions/interpretation: SGA infants showed a marked transition from lower pre-feed insulin and increased insulin sensitivity at birth to insulin resistance over the first 3 years of life. This transition was related to rapid postnatal weight gain, which could indicate a propensity to central fat deposition. The additional observation of reduced compensatory beta cell secretion underlines the need for long-term surveillance of glucose homeostasis in all SGA subjects, whether or not they show postnatal catch-up growth

C-Reactive protein and insulin growth factor 1 serum levels during the menstrual cycle in adolescents with Type 1 diabetes

© 2016 Diabetes UK.Aims: To evaluate C-reactive protein, insulin growth factor 1 and lipid levels during the follicular and luteal phases in adolescents with Type 1 diabetes. Methods: Adolescents with Type 1 diabetes (N = 40) and healthy controls (C; N = 43) were studied during the follicular and luteal phases of their menstrual cycles. C-Reactive protein, insulin growth factor 1 and lipid levels were measured. Results: Adolescents with Type 1 diabetes exhibited higher C-reactive protein levels than the C group during the follicular (P &lt; 0.0001) and luteal phases (P &lt; 0.01). The elevation of C-reactive protein levels was more pronounced in overweight adolescents with Type 1 diabetes than in adolescents in the C group. More adolescents with Type 1 diabetes were classified as having an elevated risk of cardiovascular disease (C-reactive protein &gt; 3 mg/l) in the luteal phase than in the follicular phase (37.5% and 17.5%, respectively); half of the overweight adolescents with Type 1 diabe

IGF-I sensitivity in small for gestational age children Sensibilidad a IGF-I en niños pequeños para la edad gestacional

Background: The lack of catch up growth (CUG) in small for gestational age (SGA) children may be related to a reduced sensitivity to insulin growth factor 1 (IGF-I). Aim: To assess the sensitivity to IGF-I in small for gestational age children, measuring basal and post IGF-I nocturnal profile of growth hormone (GH). Patients and methods: We studied 34 prepubertal SGA children aged 4 to 11 years. Twenty three had CUG and 11 did not have CUG. As an IGF-I sensitivity test, nocturnal GH levels were measured every 20 minutes from 23:00 h to 07:00 h, both under baseline conditions and after the administration of a subcutaneous bolus of 1 mg/kg/body weight of the IGF-I + IGFBP-3 complex (Somatokine®). Results: At the time of the study, the Z scores for height among children with and without CUG were -1.55 ± 0.22 and -3.24 ± 0.28, respectively (p &lt;0.0001). There were no statistical differences between CUG + vs CUG- patients in mean basal GH (6.6 ± 0.5 and 5.6 ± 0.6 ng/ml, respectively). Afte