Serum insulin-like growth factor-1 concentrations are reduced in severely obese women and raise after weight loss induced by laparoscopic adjustable gastric banding.
Obes Surg
; 22(8): 1276-80, 2012 Aug.
Article
em En
| MEDLINE
| ID: mdl-22648796
ABSTRACT
BACKGROUND:
Obesity is associated with abnormalities of the growth hormone/insulin-like growth factor-1 (GH/IGF-1) axis. The role of serum IGF-1 measurement for recognition of hypothalamic-pituitary diseases in obesity is still a matter of debate.METHODS:
This study evaluated the serum levels of IGF-1 in a population of severely obese women before and after long-term weight loss obtained by laparoscopic adjustable gastric banding (LAGB). Eighty obese women with body mass index (BMI) of more than 34 kg/m(2) and 80 unrelated age-matched lean controls were enrolled. IGF-1 serum levels were measured together with BMI, liver volume, and intra-abdominal fat thickness assessed by ultrasound. Evaluation was repeated 2 years after LAGB.RESULTS:
Our results showed that mean IGF-1 levels in obese subjects before LAGB were significantly lower (p < 0.001) than that observed in age-matched controls. Age and BMI were independent predictors of serum IGF-1 values, overall accounting for 39 % of IGF-1 variability. The mean IGF-1 concentration significantly increased 2 years after LAGB. BMI reduction was independently associated with IGF-1 increase (r = -0.29, p < 0.001). For each point of BMI reduction, the mean increase of serum IGF-1 was 4.39 ng/mL.CONCLUSIONS:
(1) Severely obese women have low IGF-1 serum levels with respect to normal weight age-matched controls; (2) the extent of IGF-1 deficiency is proportional to increased BMI; (3) after LAGB a spontaneous raise of serum IGF-1 occurs, proportional to the extent of weight reduction; and (4) serum IGF-1 in severely obese subjects may have a limited value for detection of hypothalamic-pituitary diseases.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Obesidade Mórbida
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Fator de Crescimento Insulin-Like I
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Gastroplastia
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Redução de Peso
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Gordura Intra-Abdominal
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Fígado
Tipo de estudo:
Diagnostic_studies
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Etiology_studies
/
Incidence_studies
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Observational_studies
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Prognostic_studies
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Risk_factors_studies
Limite:
Adult
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Female
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Humans
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article