Lack of reduction in body fat after treatment with insulin-like growth factor-I in two children with growth hormone gene deletions.
Two patients with growth hormone (GH) gene deletions were treated with recombinant insulin-like growth factor-I (IGF-I) (80-240 (microg/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.
Arnhold
I J
IJ
Unidade de Endocrinologia do Desenvolvimento, Hospital das Clinicas da Faculdade de Medicina da USP, São Paulo, Brazil. iarnhold@usp.br
Oliveira
S B
SB
Osorio
M G
MG
Carrilho
A J
AJ
Nicolau
W
W
Bianco
A C
AC
Mendonca
B B
BB
D015502:Absorptiometry, Photon; D000273:Adipose Tissue; D001823:Body Composition; D002648:Child; D005260:Female; D017353:Gene Deletion; D019382:Human Growth Hormone / Q000172:deficiency* / Q000235:genetics* / Q000627:therapeutic use; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000627:therapeutic use*; D008297:Male; D011994:Recombinant Proteins
D011994:Recombinant Proteins; D019382:Human Growth Hormone; D007334:Insulin-Like Growth Factor I