title: The association between leptin and insulin levels in adults with cystic fibrosis.
abstract: Cystic fibrosis (CF)-related diabetes is an important complication of CF caused by a decrease in insulin secretion that is associated with weight loss, poor nutritional status and increased mortality. Leptin, a hormone secreted from white adipose tissue, has an important role in energy homoeostasis by inhibiting food intake and increasing energy expenditure. Leptin secretion can be increased by nutrient signals such as insulin.
  
  
  OBJECTIVE
  Considering that leptin plays a role in energy homoeostasis and that CF is associated to poor weight gain and decreased insulin secretion, leptin levels in CF patients with different glucose tolerances were investigated and compared with those of healthy control subjects.
  
  
  METHODS
  Two-hour oral glucose tolerance tests (OGTT) were performed in 82 patients with CF and various glucose tolerances as well as in 17 healthy control subjects during which blood was withdrawn every 30 min to measure glucose and insulin. Fasting leptin, fibrinogen and fat mass were also measured, and body mass index (kg/m(2)) calculated for all participants. Early and late insulin secretion was separated by calculating the area under the curve from time 0 to 30 min and 30 to 120 min of the OGTT (AUC(0-30) and AUC(30-120)).
  
  
  RESULTS
  Leptin levels were comparable between CF patients and healthy control subjects. Interestingly, correlations were observed between leptin levels and insulin (AUC(0-120) and AUC(30-120)) after adjusting for gender and fat mass (P<0.05).
  
  
  CONCLUSIONS
  This study suggests a potential role of insulin in regulating leptin levels in adults with stable CF.
authors.affiliation: Université de Montréal, Faculty of Medicine, Nutrition Department, 2375, chemin de la Côte-Sainte-Catherine, Montréal, Québec, Canada.
authors.forename: S
authors.initials: S
authors.lastname: Ziai
authors.forename: L
authors.initials: L
authors.lastname: Belson
authors.forename: A
authors.initials: A
authors.lastname: Malet
authors.forename: A
authors.initials: A
authors.lastname: Tardif
authors.forename: Y
authors.initials: Y
authors.lastname: Berthiaume
authors.forename: L
authors.initials: L
authors.lastname: Coderre
authors.forename: R
authors.initials: R
authors.lastname: Rabasa-Lhoret
mesh_terms: D000328:Adult; D019540:Area Under Curve; D001786:Blood Glucose / Q000378:metabolism*; D015992:Body Mass Index; D002170:Canada; D015331:Cohort Studies; D003550:Cystic Fibrosis / Q000097:blood* / Q000150:complications / Q000503:physiopathology; D003920:Diabetes Mellitus / Q000097:blood* / Q000209:etiology / Q000503:physiopathology; D005215:Fasting; D005260:Female; D005340:Fibrinogen / Q000378:metabolism*; D005951:Glucose Tolerance Test; D006801:Humans; D007328:Insulin / Q000097:blood* / Q000378:metabolism; D007333:Insulin Resistance; D000078790:Insulin Secretion; D020738:Leptin / Q000097:blood*; D008297:Male; D011446:Prospective Studies
chemical_list: D001786:Blood Glucose; D007328:Insulin; D020738:Leptin; D005340:Fibrinogen