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| http://purl.uniprot.org/citations/15930167 | http://www.w3.org/2000/01/rdf-schema#comment | "Although it is well established that there is considerable inter-individual variation in the circulating levels of IGF-I in normal, healthy individuals and that a genetic component contributes substantially to this variation, the direct evidence that inter-individual variation in IGF-I contributes to differences in peak bone mineral density (BMD) is lacking. To examine if differences in IGF-I expression could contribute to peak BMD differences, we measured skeletal changes at days 23 (prepubertal), 31 (pubertal) and 56 (postpubertal) in mice with haploinsufficiency of IGF-I (+/-) and corresponding control mice (+/+). Mice (MF1/DBA) heterozygous for the IGF-I knockout allele were bred to generate +/+ and +/-mice (n=18-20 per group). Serum IGF-I was decreased by 23% (P<0.001) in mice with IGF-I haploinsufficiency (+/-) group at day 56 compared with the control (+/+) group. Femoral bone mineral content and BMD, as determined by dual energy X-ray absorptiometry, were reduced by 20% (P<0.001) and 12% respectively in the IGF-I (+/-) group at day 56 compared with the control group. The peripheral quantitative computed tomography measurements at the femoral mid-diaphysis revealed that periosteal circumference (7%, P<0.01) and total volumetric BMD (5%, P<0.05) were decreased significantly in the +/-group compared with the +/+ group. Furthermore, serum IGF-I showed significant positive correlations with both areal BMD (r=0.55) and periosteal circumference (r=0.66) in the pooled data from the +/+ and +/-groups. Our findings that haploinsufficiency of IGF-I caused significant reductions in serum IGF-I level, BMD and bone size, together with the previous findings, are consistent with the notion that genetic variations in IGF-I expression could, in part, contribute to inter-individual differences in peak BMD among a normal population."xsd:string |
| http://purl.uniprot.org/citations/15930167 | http://purl.org/dc/terms/identifier | "doi:10.1677/joe.1.06141"xsd:string |
| http://purl.uniprot.org/citations/15930167 | http://purl.uniprot.org/core/author | "Mohan S."xsd:string |
| http://purl.uniprot.org/citations/15930167 | http://purl.uniprot.org/core/author | "Baylink D.J."xsd:string |
| http://purl.uniprot.org/citations/15930167 | http://purl.uniprot.org/core/date | "2005"xsd:gYear |
| http://purl.uniprot.org/citations/15930167 | http://purl.uniprot.org/core/name | "J Endocrinol"xsd:string |
| http://purl.uniprot.org/citations/15930167 | http://purl.uniprot.org/core/pages | "415-420"xsd:string |
| http://purl.uniprot.org/citations/15930167 | http://purl.uniprot.org/core/title | "Impaired skeletal growth in mice with haploinsufficiency of IGF-I: genetic evidence that differences in IGF-I expression could contribute to peak bone mineral density differences."xsd:string |
| http://purl.uniprot.org/citations/15930167 | http://purl.uniprot.org/core/volume | "185"xsd:string |
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