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Submitted on July 27, 2005
Accepted on November 3, 2005
INSERM Unit 690, Robert Debré Hospital, Paris, France; Pediatric Endocrinology and Diabetes Unit, Robert Debré Hospital, Assistance Publique-Hôpitaux de Paris, France; Service de Biochimie Hormonologie, Robert Debre Hospital, Assistance Publique-Hôpitaux de Paris, France; Pediatric Endocrinology, Diabetic Unit, INSERM EMI 0363, Hôpital des Enfants-Malades, Paris, France
* To whom correspondence should be addressed. E-mail: drucel{at}yahoo.fr.
Context: Type 2 diabetes (T2D) in obese children is an emerging problem, including in Europe. Its presentation at diagnosis very often differs from that in adults.
Objective: The objective of this study was to investigate the relative contribution of the two components of T2D: insulin resistance and insulin secretion, early in the history of the disease in adolescents.
Patients and Methods: Six obese adolescents with T2D were included 2 months to 4.3 yr after diagnosis (5 girls and 1 boy with a median age of 15.4 yr and a median BMI of 4.4 SD). Peripheral and hepatic insulin sensitivity was evaluated with euglycemic hyperinsulinemic (40 mU/m2/min) clamp. First phase insulin release was evaluated after intravenous glucose stimulation. Graded intravenous glucose infusion and arginine test were performed to measure insulin secretion.
Results: All patients showed decreased peripheral glucose uptake to the same extent. Five patients showed hepatic insulin resistance. First phase insulin release was very low in two patients. Three patients showed an exaggerated insulin response under graded glucose infusion and preserved secretion under arginine stimulation. Three other patients, with elevated fasting plasma glucose, demonstrated a very low insulin response under glucose stimulation and a low insulin response under arginine stimulation.
Conclusions: These data emphasize that, together with marked IR, the failure of
cell function is a major component in the course of T2D in childhood.
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