Treatment of iodine deficiency in school-age children increases 1GF-1 and IGFBP-3 concentrations and improvves somatic growth

M.B. Zimmermann, P.L. Jooste, N. Solomon Mabapa, X. Mbhenyane, S. Schoeman, R. Biebinger, N. Chaouki, M. Bozo, L. Grimci, J. Bridson

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Abstract

Objective: To determine if iodine repletion improves somatic growth in iodine-deficient children and to investigate the role of insulin-like growth factor (IGF)-1 and insulin-like growth factor binding protein (IGFBP)-3 in this effect. Design, participants, and interventions: Three prospective, double blind intervention studies were done: 1) in a 10 month study, severely iodine-deficient, 7-10 y-old Moroccan children (n = 71) were provided iodized salt and compared with children not using iodized salt; 2) in a 6 month study, moderately iodine-deficient, 10-12 y-old Albanian children (n = 310) were given 400 mg iodine as oral iodized oil or placebo; 3) in a 6 month study, mildly iodine-deficient 5-14 y-old South African children (n = 188) were given two doses of 200 mg iodine as oral iodized oil or placebo. At baseline and follow-up, height, weight, urinary iodine (UI), total thyroxine (TT4), thyroid-stimulating hormone (TSH) and IGF-I were measured; in Albania and South Africa, IGFBP-3 was also measured. Results: In all three studies, iodine treatment increased median UI to >100 µg/L, while median UI in the controls remained unchanged. In South Africa, iodine repletion modestly increased IGF-1, but did not have a significant effect on IGFBP-3, TT4 or growth. In Albania and Morocco, iodine repletion significantly increased TT4, IGF-1, IGFBP-3, weight-for-age z scores and height-for-age z scores. Conclusion: This is the first controlled study to clearly demonstrate that iodine repletion in school-age children increases IGF-1 and IGFBP-3 concentrations and improves somatic growth.
Original languageEnglish
Pages (from-to)437-442
JournalJournal of Clinical Endocrinology and Metabolism
Volume92
Issue number2
DOIs
Publication statusPublished - 2007

Keywords

  • factor-i
  • thyroid-hormone
  • endemic goiter
  • rat
  • supplementation
  • cells
  • hyperthyroidism
  • hypothyroidism
  • schoolchildren
  • dysfunction

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    Zimmermann, M. B., Jooste, P. L., Solomon Mabapa, N., Mbhenyane, X., Schoeman, S., Biebinger, R., Chaouki, N., Bozo, M., Grimci, L., & Bridson, J. (2007). Treatment of iodine deficiency in school-age children increases 1GF-1 and IGFBP-3 concentrations and improvves somatic growth. Journal of Clinical Endocrinology and Metabolism, 92(2), 437-442. https://doi.org/10.1210/jc.2006-1901