Journal of Endocrinological Investigation

, Volume 23, Issue 4, pp 258–262 | Cite as

Lack of reduction in body fat after treatment with insulin-like growth factor-I in two children with growth hormone gene deletions

  • I. J. P. Arnhold
  • S. B. Oliveira
  • M. G. F. Osorio
  • A. J. F. Carrilho
  • W. Nicolau
  • A. C. Bianco
  • B. B. Mendonca
Case Report

Abstract

Two patients with growth hormone (GH) gene deletions were treated with recombinant insulin-like growth factor-I (IGF-I) (80–240 (μg/kg/ day) and the effects on bone mass and body composition were compared to administration of GH (0.075 U/kg/day) to 8 patients with idiopathic GH deficiency. Bone mass and body composition were measured by dual photon X-ray absorptiometry (DEXA) before and 3 and 6 months after treatment with GH or IGF-I. Similar increases in growth velocities were observed after GH and IGF-I treatment. Treatment with GH resulted in prompt and significant reduction in body fat percentage (basal, 3 and 6 months: 22±10, 17±9, and 16±9%) whereas body fat percentage remained unchanged after IGF-I therapy (basal, 3 and 6 months: 49, 52 and 48% in patient 1 and 45, 42 and 43% in patient 2, respectively). Fat percentage remained elevated after 18 months of IGF-I treatment in patients 1 (51%) and 2 (44%), respectively. Lean mass and bone mineral content increased with GH and IGF-I therapies. We conclude that reduction of body fat measured by DEXA, observed after administration of GH but not after IGF-I treatment in these children with GH deficiency, suggests that the GH effect on body fat mass is not mediated by circulating IGF-I.

Key-words

IGF-I treatment body composition GH deficiency GH gene deletions body fat 

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Copyright information

© Italian Society of Endocrinology (SIE) 2000

Authors and Affiliations

  • I. J. P. Arnhold
    • 1
  • S. B. Oliveira
    • 1
  • M. G. F. Osorio
    • 1
  • A. J. F. Carrilho
    • 2
  • W. Nicolau
    • 1
  • A. C. Bianco
    • 3
  • B. B. Mendonca
    • 1
  1. 1.Unidade de Endocrinologia do DesenvolvimentoHospital das Clinicas da Faculdade de Medicina da USPSão PauloBrazil
  2. 2.Laboratório de Lípides, Divisão de EndocrinologiaHospital das Clinicas da Faculdade de Medicina da USPSão PauloBrazil
  3. 3.Departmento de Fisiologia e Biofísica, ICBUniversidade de São PauloSão PauloBrazil

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