The relationship between calciotropic hormones, IGF-1, and bone mass across pubertal stages

Maria Matar, Laila Al-Shaar, Joyce Maalouf, Mona Nabulsi, Asma Arabi, Mahmoud Choucair, Hani Tamim, Ghada El-Hajj Fuleihan

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Little is known about the changes in calciotropic hormones during puberty and their relationship to bone mass during this critical period for skeletal accretion. Objectives: Investigate changes in calciotropic hormones, IGF-1, body composition, and their associations with bone metabolism in adolescents. Methods: Post hoc analyses were performed from data on 335 healthy school children, ages 10-17 years, with hypovitaminosisDwhoparticipated in a vitaminDrandomized controlled trial. Baseline serum biochemistries; hormonal studies; densitometry at the spine, hip, and total body; and body composition were used. ANOVA and regression analyses were implemented to evaluate changes in variables of interest across pubertal stages, within and between genders. Results: Bone mass and body composition parameters increased substantially across Tanner stages in both genders. Serum calcium, 1,25-dihydroxyvitamin D, and 25-hydroxyvitamin D levels did not vary by Tanner stages in both genders. Conversely, serum phosphorus, alkaline phosphatase, IGF-1, PTH, and osteocalcin peaked for the most part at Tanner stage II in girls and stage III in boys. 1,25-Dihydroxyvitamin D correlations with bone mass were not consistent, whereas IGF-1 was the most robust correlate of bone mass at several skeletal sites in early Tanner stages in both genders (R = 0.3- 0.6). Conclusion: Serum phosphorus, alkaline phosphatase, IGF-1, PTH, and osteocalcin, but not calcium or 1,25-dihydroxyvitamin D, increased significantly in early puberty, with gender difference except for PTH, peaking earlier in girls than in boys. IGF-1 is a robust predictor of bone mass, an effect mediated in large part by increments in lean mass.

Original languageEnglish (US)
Pages (from-to)4860-4870
Number of pages11
JournalJournal of Clinical Endocrinology and Metabolism
Volume101
Issue number12
DOIs
StatePublished - Dec 2016

All Science Journal Classification (ASJC) codes

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

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