Serum leptin concentration during puberty in healthy nonobese adolescents

Serum leptin concentration during puberty in healthy nonobese adolescents

Autor Brandao, Cynthia Maria Alvares Autor UNIFESP Google Scholar
Lombardi, M.t. Autor UNIFESP Google Scholar
Nishida, Sonia Kiyomi Autor UNIFESP Google Scholar
Hauache, Omar Magid Autor UNIFESP Google Scholar
Vieira, Jose Gilberto Henriques Autor UNIFESP Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Resumo Data obtained during the past five years have indicated that there are important age- and gender-based differences in the regulation and action of leptin in humans. To study the physiological changes of leptin during puberty in both sexes, and its relationship with body composition and sexual maturation, we measured leptin concentrations in 175 healthy adolescents (80 girls, 95 boys, 10-18 years of age), representing all pubertal stages. We excluded individuals with a body mass index (BMI) below the 5thor above the 95th percentile relative to age. Serum concentrations of leptin were determined by a monoclonal antibody-based immunofluorimetric assay, developed in our laboratory. Body composition was determined by dual-energy X-ray absorptiometry. Pubertal stage was assigned by physical examination, according to Tanner criteria for breast development in females and genital development in males. Leptin concentration in girls (N = 80) presented a positive linear correlation with age (r = 0.35, P = 0.0012), BMI (r = 0.65, P < 0.0001) and %fat mass (r = 0.76, P < 0.0001). In boys (N = 95) there was a positive correlation with BMI (r = 0.49, P < 0.0001) and %fat mass (r = 0.85, P < 0.0001), but a significant negative linear correlation with Tanner stage (r = -0.45, P < 0.0001) and age (r = -0.40, P < 0.0001). The regression equation revealed that %fat mass and BMI are the best parameters to be used to estimate leptin levels in both sexes. Thus, the normal reference ranges for circulating leptin during adolescence should be constructed according to BMI or %fat mass to assure a correct evaluation.
Assunto Leptin
Pubertal development
Body composition
Idioma Inglês
Data 2003-10-01
Publicado em Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 36, n. 10, p. 1293-1296, 2003.
ISSN 0100-879X (Sherpa/Romeo, fator de impacto)
Editor Associação Brasileira de Divulgação Científica
Extensão 1293-1296
Fonte http://dx.doi.org/10.1590/S0100-879X2003001000003
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000185906900004
SciELO S0100-879X2003001000003 (estatísticas na SciELO)
URI http://repositorio.unifesp.br/handle/11600/1853

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