The relationships between IGF-1 and CRP, NO, leptin, and adiponectin during weight loss in the morbidly obese.
BACKGROUND
The relationship between C-reactive protein (CRP), nitric oxide (NO), leptin, adiponectin, and insulin growth factor 1 (IGF-1) is poorly defined in morbidly obese patients before and after gastric bypass and, in some cases, is controversial.


METHODS
We examined the plasma of 34 morbidly obese patients before and 1, 6, and 12 months after Roux-en-Y gastric bypass surgery.


RESULTS
Obese people had more CRP (21.3 +/- 1.8 microg/ml) and leptin (36.9 +/- 4.0 ng/ml) than those in the control group (nonobese people: CRP = 6.9 +/- 0.9 microg/ml, p < 0.0001; leptin = 7.5 +/- 0.4 ng/ml, p < 0.0001). However, they had less NO (30.4 +/- 2.7 nmol/ml), IGF-1 (77.5 +/- 6.6 ng/ml), and adiponectin (11.1 +/- 1.0 microg/ml) than those in the control group (NO = 45.8 +/- 3.9 nmol/ml, p = 0.0059; IGF-1 = 202.0 +/- 12.0 ng/ml, p < 0.0001; adiponectin = 18.0 +/- 2.0 microg/ml, p < 0.0001). During weight loss, the amount of CRP and leptin decreased until they reached the nonobese values, but the level of NO remained lower than in nonobese people, even 1 year after surgery. The linear regression slopes were negative and very significant for leptin (p = 0.0005) and CRP (p = 0.0018) but were less significant for NO (p = 0.0221). IGF-1 displayed a very good linear regression (both negative and significant) with some anthropometric parameters, including body mass index (p = 0.0025), total fat (p = 0.0177), and the percentage of fat (p < 0.0001).


CONCLUSIONS
For the first time, we report the relationship between IGF-1 and CRP, NO, leptin, and adiponectin. For all these parameters, the best and most widely demonstrated improvements in comorbidities before and during weight loss in morbid obesity were associated with CRP and leptin.
Pardina
Eva
E
Biochemistry and Molecular Biology Department, Biology Faculty, Barcelona University, Barcelona, Spain.
Ferrer
Roser
R
Baena-Fustegueras
Juan Antonio
JA
Lecube
Albert
A
Fort
Jose Manuel
JM
Vargas
Víctor
V
Catalán
Roberto
R
Peinado-Onsurbe
Julia
J
D052242:Adiponectin / Q000097:blood*; D000328:Adult; D015992:Body Mass Index; D002097:C-Reactive Protein / Q000032:analysis*; D005260:Female; D015390:Gastric Bypass / Q000379:methods; D006801:Humans; D007328:Insulin / Q000097:blood; D007334:Insulin-Like Growth Factor I / Q000032:analysis*; D020738:Leptin / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009569:Nitric Oxide / Q000097:blood*; D009767:Obesity, Morbid / Q000097:blood* / Q000601:surgery; D015431:Weight Loss
D052242:Adiponectin; D007328:Insulin; D020738:Leptin; D009569:Nitric Oxide; D007334:Insulin-Like Growth Factor I; D002097:C-Reactive Protein