title: Circulating omentin concentration increases after weight loss.
abstract: BACKGROUND
  Omentin-1 is a novel adipokine expressed in visceral adipose tissue and negatively associated with insulin resistance and obesity. We aimed to study the effects of weight loss-induced improved insulin sensitivity on circulating omentin concentrations.
  
  
  METHODS
  Circulating omentin-1 (ELISA) concentration in association with metabolic variables was measured in 35 obese subjects (18 men, 17 women) before and after hypocaloric weight loss.
  
  
  RESULTS
  Baseline circulating omentin-1 concentrations correlated negatively with BMI (r = -0.58, p < 0.001), body weight (r = -0.35, p = 0.045), fat mass (r = -0.67, p < 0.001), circulating leptin (r = -0.7, p < 0.001) and fasting insulin (r = -0.37, p = 0.03). Circulating omentin-1 concentration increased significantly after weight loss (from 44.9 +/- 9.02 to 53.41 +/- 8.8 ng/ml, p < 0.001). This increase in circulating omentin after weight loss was associated with improved insulin sensitivity (negatively associated with HOMA value and fasting insulin, r = -0.42, p = 0.02 and r = -0.45, p = 0.01, respectively) and decreased BMI (r = -0.54, p = 0.001).
  
  
  CONCLUSIONS
  As previously described with adiponectin, circulating omentin-1 concentrations increase after weight loss-induced improvement of insulin sensitivity.
authors.affiliation: Service of Diabetes, Endocrinology and Nutrition, Institut d'Investigació Biomèdica de Girona (IdIBGi) Hospital Dr Josep Trueta, Girona, 17007, CIBEROBN (CB06/03/010), Spain. jmfernandezreal.girona.ics@gencat.cat.
authors.forename: José María
authors.initials: JM
authors.lastname: Moreno-Navarrete
authors.forename: Victoria
authors.initials: V
authors.lastname: Catalán
authors.forename: Francisco
authors.initials: F
authors.lastname: Ortega
authors.forename: Javier
authors.initials: J
authors.lastname: Gómez-Ambrosi
authors.forename: Wifredo
authors.initials: W
authors.lastname: Ricart
authors.forename: Gema
authors.initials: G
authors.lastname: Frühbeck
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Fernández-Real