Impaired glucose tolerance (IGT) is frequently associated with an increased fat mass and an altered fat distribution. The adipocyte derived hormone, leptin has been shown to interact with insulin at various levels and may be intimately involved in this process. However, only limited data concerning the interaction of insulin, glucose tolerance and leptin are available and no data exist on the potential influence of bound vs. free circulating leptin. We therefore studied free and bound leptin in 136 patients (77 males, 59 females) with IGT, in relation to plasma glucose, insulin, proinsulin and C-peptide levels as well as serum free and bound leptin concentrations during an oral glucose tolerance test (oGTT). The expected positive relation of free serum leptin levels with body mass index (BMI) was found. Free leptin concentrations were higher in women than in men. Analysis in tertiles revealed a significant relation between free leptin (16-58, 60-160, and 169-932 pmol/l) and mean fasting insulin levels (65, 93, and 100 pmol/l). This relationship remained significant in a multiple regression analysis with BMI and gender as covariates. Similar independent relationships to leptin serum levels were observed for HbA1c and plasma C peptide levels and the proinsulin/insulin ratio but not for plasma glucose and proinsulin levels. These data suggest a fine tuning of leptin by small changes in circulating insulin levels observed in impaired glucose tolerance.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1055/s-0029-1212072 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Longitudinal Associations of PFAS Exposure With Insulin Sensitivity and β-Cell Function Among Hispanic Women With Gestational Diabetes Mellitus History.
Diabetes Care
January 2025
Department of Population and Public Health Sciences, Keck School of Medicine, University of Southern California, Los Angeles, CA.
Objective: We investigated associations between per- and polyfluoroalkyl substances (PFAS) and changes in diabetes indicators from pregnancy to 12 years after delivery among women with a history of gestational diabetes mellitus (GDM).
Research Design And Methods: Eighty Hispanic women with GDM history were followed from the third trimester of pregnancy to 12 years after delivery. Oral and intravenous glucose tolerance tests were conducted during follow-up.
Fasting glucose levels at diagnosis and delivery are associated with postpartum glucose abnormalities in GDM women.
Arch Gynecol Obstet
January 2025
Department of Obstetrics and Gynaecology, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand.
Women with a history of gestational diabetes mellitus (GDM) significantly increase the risk of developing type 2 diabetes later in life. Although the increased glucose levels typically return to normal range after delivery for most GDM women, a significant proportion of GDM women develop impaired glucose tolerance or overt diabetes after delivery. Several factors associated with postpartum glucose abnormalities have been identified, yet the link between fasting glucose levels at diagnosis of GDM and postpartum glucose abnormalities remains unclear.
View Article and Find Full Text PDFGlucose Metabolic Abnormalities and Their Interaction With Defective Phosphate Homeostasis in Tumor-induced Osteomalacia.
J Clin Endocrinol Metab
January 2025
Department of Endocrinology, Key Laboratory of Endocrinology, State Key Laboratory of Complex Severe and Rare Diseases, Dongcheng District, National Commission of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, China.
Context: Phosphate homeostasis was compromised in tumor-induced osteomalacia (TIO) due to increased fibroblast growth factor 23 (FGF23) secretion. Nevertheless, the glucose metabolic profile in TIO patients has not been investigated.
Objectives: This work aimed to clarify the glucose metabolic profiles in TIO patients and explore their interaction with impaired phosphate homeostasis.
Utility of the C-peptide/insulin molar ratio for distinguishing type A insulin resistance syndrome from type 2 diabetes.
J Clin Endocrinol Metab
January 2025
Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan.
Objective: Type A insulin resistance syndrome (IRS), characterized by impaired insulin receptor function due to variants of the insulin receptor gene, manifests as severe insulin-resistant diabetes. Differentiation of type A IRS from type 2 diabetes on the basis of hyperinsulinemia can be challenging. Given the association between insulin receptor dysfunction and reduced insulin clearance, we evaluated the potential of the circulating C-peptide reactivity (CPR)/immunoreactive insulin (IRI) molar ratio, a marker of insulin clearance, for distinguishing type A IRS from type 2 diabetes.
View Article and Find Full Text PDFThe deuterated glucose insulin tolerance test: a new tool to delineate insulin-stimulated glucose uptake from suppression of endogenous glucose production.
Life Metab
February 2025
Department of Pathology, Microbiology, and Immunology, University of South Carolina-School of Medicine, Columbia, SC 29029, United States.
Graphical Abstract.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!