hrp0086fc13.2 | Management of Obesity | ESPE2016

Measurement of Immunofunctional Leptin to Detect Patients with Functional Leptin Deficiency

Wabitsch Martin , Pridzun Lutz , Ranke Michael , Flehmig Bertram , Fischer-Posovszky Pamela , Moss Anja , Schaab Michael , von Schnurbein Julia , Kratzsch Jurgen

Background: Recently, patients with severe obesity have been described due to functional leptin deficiency. This new entity is characterized by high immunoreactive levels of circulating leptin (Lep), but a reduced bioactivity of the hormone due to defective receptor binding (N Engl J Med 2015;372:48–54). Since these patients can be successfully treated with human recombinant leptin (metreleptin), a diagnostic tool to detect functional leptin deficiency is needed.<p cl...

hrp0089p2-p141 | Fat, Metabolism and Obesity P2 | ESPE2018

Associations between Total Leptin, Bio-inactive Leptin, Soluble Leptin Receptor and Anthropometrics in Children with Severe Early-onset Obesity (SEOO) – the German-Polish Study (EOL-GPS)

Zachurzok Agnieszka , Malecka-Tendera Ewa , Petriczko Elzbieta , Mazur Artur , Pridzun Lutz , Flehmig Bertram , Schnurbein Julia von , Ranke Michael B. , Wabitsch Martin , Brandt Stephanie

Background: Severe early-onset obesity (SEOO) in children is more frequently observed in subjects with genetic disorders of which those of leptin pathway can be analyzed biochemically and genetically.Objectives: The aim of the study was to investigate anthropometrics and leptin parameters, specifically searching for bio-inactive leptin, in children with SEOO.Methods: Study cohort includes children ...

hrp0097p1-59 | Fat, Metabolism and Obesity | ESPE2023

Diagnostic value of soluble LEPR levels in the serum of patients with disease-causing biallelic LEPR variants

Zorn Stefanie , Tews Daniel , von Schnurbein Julia , Flehmig Bertram , Pridzun Lutz , Wabitsch Martin , Malene IV , Chantana Yay , Khun Leang Chhun , Ban Manet , Tyla Martin , Ngee Lek

Introduction: The soluble leptin receptor (sLR) is the main binding protein of leptin in the serum. It reflects the amount of membrane-bound leptin receptors (LEPR) as the sLR is produced by proteolytic cleavage of the extracellular domain of membrane-bound LEPR. Low sLR but high leptin levels were measured in patients with severe obesity. In patients with monogenic obesity caused by biallelic LEPR variants, sLR levels were found to be either undetect...

hrp0097p1-256 | Fat, Metabolism and Obesity | ESPE2023

Serum leptin concentrations in a pooled cohort of 6.105 children and adolescents: Reference values as a function of dependence on sex, age, pubertal stage and BMI-SDS

Brandt Stephanie , Vogel Mandy , Kratzsch Jürgen , Tews Daniel , Pridzun Lutz , Flehmig Bertram , B Ranke Michael , Körner Antje , Kiess Wieland , F Blum Werner , Wabitsch Martin

Background: Current reference values for leptin in childhood and adolescence are presented separately for girls and boys, and as a function of age without considering the variability of fat mass. This complicates the interpretation of measured serum leptin concentrations since fat mass is the major determinant of circulating leptin concentrations. To fill this gap, we aimed at pooling existing data (age, BMI, sex, tanner stage (TS), serum leptin concentrations...