Resistin, adiponectin, ghrelin, leptin, and proinflammatory cytokines: relationships in obesity.
OBJECTIVE
To evaluate interactions among leptin, adiponectin, resistin, ghrelin, and proinflammatory cytokines [tumor necrosis factor receptors (TNFRs), interleukin-6 (IL-6)] in nonmorbid and morbid obesity.


METHODS
We measured these hormones by immunoenzyme or radiometric assays in 117 nonmorbid and 57 morbidly obese patients, and in a subgroup of 34 morbidly obese patients before and 6 months after gastric bypass surgery. Insulin resistance by homeostasis model assessment, lipid profile, and anthropometrical measurements were also performed in all patients.


RESULTS
Average plasma lipids in morbidly obese patients were elevated. IL-6, leptin, adiponectin, and resistin were increased and ghrelin was decreased in morbidly obese compared with nonmorbidly obese subjects. After adjusting for age, gender, and BMI in nonmorbidly obese, adiponectin was positively associated with HDLc and gender and negatively with weight (beta = -0.38, p < 0.001). Leptin and resistin correlated positively with soluble tumor necrosis factor receptor (sTNFR) 1 (beta = 0.24, p = 0.01 and beta = 0.28, p = 0.007). In the morbidly obese patients, resistin and ghrelin were positively associated with sTNFR2 (beta = 0.39, p = 0.008 and beta = 0.39, p = 0.01). In the surgically treated morbidly obese group, body weight decreased significantly and was best predicted by resistin concentrations before surgery (beta = 0.45, p = 0.024). Plasma lipids, insulin resistance, leptin, sTNFR1, and IL-6 decreased and adiponectin and ghrelin increased significantly. Insulin resistance improved after weight loss and correlated with high adiponectin levels.


CONCLUSIONS
TNFalpha receptors were involved in the regulatory endocrine system of body adiposity independently of leptin and resistin axis in nonmorbidly obese patients. Our results suggest coordinated roles of adiponectin, resistin, and ghrelin in the modulation of the obesity proinflammatory environment and that resistin levels before surgery treatment are predictive of the extent of weight loss after bypass surgery.
Vendrell
Joan
J
Secció d'Endocrinología, Hospital Universitari Joan XXIII de Tarragona, c/Mallafré Guasch 4, 43007, Spain. jvo@comt.es
Broch
Montserrat
M
Vilarrasa
Nuria
N
Molina
Ana
A
Gómez
Jose Manuel
JM
Gutiérrez
Cristina
C
Simón
Immaculada
I
Soler
Joan
J
Richart
Cristóbal
C
D052242:Adiponectin; D000328:Adult; D001786:Blood Glucose / Q000378:metabolism; D002784:Cholesterol / Q000097:blood; D016207:Cytokines / Q000097:blood*; D005260:Female; D015390:Gastric Bypass; D054439:Ghrelin; D006729:Hormones, Ectopic / Q000097:blood*; D006801:Humans; D007328:Insulin / Q000097:blood; D007333:Insulin Resistance; D036341:Intercellular Signaling Peptides and Proteins; D015850:Interleukin-6 / Q000097:blood; D020738:Leptin / Q000097:blood; D008297:Male; D008875:Middle Aged; D009767:Obesity, Morbid / Q000097:blood* / Q000601:surgery; D036361:Peptide Hormones / Q000097:blood*; D011506:Proteins / Q000378:metabolism*; D052243:Resistin; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D015431:Weight Loss / Q000502:physiology*
D052242:Adiponectin; D001786:Blood Glucose; D016207:Cytokines; D054439:Ghrelin; D006729:Hormones, Ectopic; D007328:Insulin; D036341:Intercellular Signaling Peptides and Proteins; D015850:Interleukin-6; D020738:Leptin; D036361:Peptide Hormones; D011506:Proteins; C499624:RETN protein, human; D052243:Resistin; D014409:Tumor Necrosis Factor-alpha; D002784:Cholesterol