Journal of Bone and Mineral Metabolism

, Volume 27, Issue 5, pp 613–619 | Cite as

Relationship between bone mineral density, leptin and insulin concentration in Brazilian obese adolescents

  • Wagner Luiz do Prado
  • Aline de Piano
  • Marise Lazaretti-Castro
  • Marco Túlio de Mello
  • Sérgio Garcia Stella
  • Sergio Tufik
  • Cláudia Maria Oller do Nascimento
  • Lila Missae Oyama
  • Mara Cristina Lofrano
  • Lian Tock
  • Danielle Arisa Caranti
  • Ana Raimunda Dâmaso
Original Article

Abstract

Despite the epidemic of adolescent obesity, the effect of obesity and hormones on bone mineral accrual during growth is poorly understood. Studies using dual-energy X-ray to examine the effect of obesity on bone mass in children and adolescents have yielded conflicting results. The aim of this study was to explore the combined and independent contributions of body mass index, body composition, leptin, insulin, glucose levels and Homeostasis Model Assessment Insulin Resistance (HOMA-IR) to bone mineral density (BMD) and bone mineral content in a group of Brazilian obese adolescents. This study included 109 post-pubescent obese adolescents. A whole-body dual-energy X-ray absorptiometry scan was performed,using a HOLOGIC QDR4200, to determine whole-body BMD and body composition. Blood samples were collected in the outpatient clinic after an overnight fast, and evaluated for fasting blood glucose and immunoreactive insulin. Leptin levels were assessed with a radioimmunoassay kit. Insulin resistance was assessed by HOMA-IR and the quantitative insulin sensitivity check index. Our results showed that insulin levels and HOMA-IR correlated negatively with BMD and a linear regression analysis showed that serum leptin is inversely associated to BMD adjusted for body mass. In conclusion, our data support the hypothesis that leptin, insulin and HOMA-IR are inversely associated with BMD and play a significant direct role in bone metabolism.

Keywords

Obesity Bone mass Hormones DEXA Body composition 

Notes

Acknowledgments

AFIP, FAPESP, CNPQ and CAPES supported the CEPE multidisciplinary obesity intervention program. CENESP, FADA, FAPESP (2006/00684-3; 2008/53069-0), (CEPID/Sleep #9814303-3 st), UNIFESP. Special thanks to patients and their parents.

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Copyright information

© The Japanese Society for Bone and Mineral Research and Springer 2009

Authors and Affiliations

  • Wagner Luiz do Prado
    • 1
  • Aline de Piano
    • 2
  • Marise Lazaretti-Castro
    • 2
  • Marco Túlio de Mello
    • 4
  • Sérgio Garcia Stella
    • 3
  • Sergio Tufik
    • 4
  • Cláudia Maria Oller do Nascimento
    • 2
  • Lila Missae Oyama
    • 2
  • Mara Cristina Lofrano
    • 2
  • Lian Tock
    • 2
  • Danielle Arisa Caranti
    • 2
  • Ana Raimunda Dâmaso
    • 5
  1. 1.Physical Education High SchoolPernambuco UniversityPernambucoBrazil
  2. 2.Nutrition Post-Graduation Program, Paulista Medicine SchoolSão Paulo Federal UniversitySão PauloBrazil
  3. 3.Universidade de Ribeirão Preto - UNAERPSão PauloBrazil
  4. 4.Department of Psychobiology, Paulista Medicine SchoolSão Paulo Federal UniversitySão PauloBrazil
  5. 5.Department of Biosciences, Paulista Medicine SchoolSão Paulo Federal UniversitySão PauloBrazil

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