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Bone. 2005 Dec;37(6):833-41. Epub 2005 Sep 8.

Investigating the role of the growth hormone-insulin-like growth factor (GH-IGF) axis as a determinant of male bone mineral density (BMD).

Author information

1
MRC Environmental Epidemiology Unit, Southampton General Hospital, Southampton SO16 6YD, UK.

Abstract

INTRODUCTION:

The GH-IGF axis has profound effects on bone metabolism and may be important in the etiology of idiopathic osteoporosis. Serum IGF-I is often low in men with osteoporosis, which may be attributable to GH hypo-secretion or hepatic GH insensitivity. We studied the GH-IGF axis in depth to look for evidence to support these hypotheses.

MATERIALS AND METHODS:

28 healthy 60- to 70-year-old men with low, intermediate, or normal BMD were studied. GH secretion was measured by overnight urine collection. GH reserve was assessed by exercise and glucagon stimulation tests. Hepatic IGF-I production was investigated using a GH-IGF-I generation test. Data were analyzed using Pearson's correlation coefficient, linear regression, and analysis of variance.

RESULTS:

Serum IGF-I was reduced in subjects with low BMD (P = 0.009). There was no difference in GH secretion or reserve between the groups. Overall, GH reserve and IGF-I were positively related but this was attenuated in the low BMD group. However, no statistically significant difference in IGF-I generation capacity between BMD groups was found.

CONCLUSIONS:

Men with reduced BMD have low IGF-I but normal GH secretion and reserve. Our data suggested, but could not confirm, hepatic resistance to GH as a mechanism for this association.

PMID:
16153900
DOI:
10.1016/j.bone.2005.06.016
[Indexed for MEDLINE]

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