title: Prehepatic secretion and disposal of insulin in obese adolescents as estimated by three-hour, eight-sample oral glucose tolerance tests.
abstract: The body compensates for early-stage insulin resistance by increasing insulin secretion. A reliable and easy-to-use mathematical assessment of insulin secretion and disposal could be a valuable tool for identifying patients at risk for the development of type 2 diabetes. Because the pathophysiology of insulin resistance is incompletely understood, assessing insulin metabolism with minimal assumptions regarding its metabolic regulation is a major challenge. To assess insulin secretion and indexes of insulin disposal, our marginalized and regularized absorption approach (MRA) was applied to a sparse sampling oral glucose tolerance test (OGTT) protocol measuring the insulin and C-peptide concentrations. Identifiability and potential bias of metabolic parameters were estimated from published data with dense sampling. The MRA was applied to OGTT data from 135 obese adolescents to demonstrate its clinical applicability. Individual prehepatic basal and dynamic insulin secretion and clearance levels were determined with a precision and accuracy greater than 10% of the nominal value. The intersubject variability in these parameters was approximately four times higher than the intrasubject variability, and there was a strong negative correlation between prehepatic secretion and plasma clearance of insulin. MRA-based analysis provides reliable estimates of insulin secretion and clearance, thereby enabling detailed glucose homeostasis characterization based on restricted datasets that are obtainable during routine patient care.
authors.affiliation: Institut für Anästhesiologische Pathophysiologie und Verfahrensentwicklung, Universitätsklinikum Ulm, Ulm, Germany; and Josef.Vogt@uni-ulm.de.
authors.forename: Josef A
authors.identifier: http://orcid.org/0000-0001-5860-8367
authors.initials: JA
authors.lastname: Vogt
authors.affiliation: Division of Pediatric Endocrinology and Diabetes, Interdisciplinary Obesity Unit, Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Domzig
authors.affiliation: Division of Pediatric Endocrinology and Diabetes, Interdisciplinary Obesity Unit, Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Wabitsch
authors.affiliation: Division of Pediatric Endocrinology and Diabetes, Interdisciplinary Obesity Unit, Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Denzer
mesh_terms: D000293:Adolescent; D002096:C-Peptide / Q000378:metabolism*; D002648:Child; D005951:Glucose Tolerance Test / Q000379:methods; D006801:Humans; D007328:Insulin / Q000378:metabolism*; D007333:Insulin Resistance; D008099:Liver / Q000378:metabolism*; D009765:Obesity / Q000378:metabolism*; D055815:Young Adult
chemical_list: D002096:C-Peptide; D007328:Insulin
keywords: C-peptide; MCMC simulation; OGTT; bayesian analysis; insulin; modeling