Dlk1/FA1 is a novel endocrine regulator of bone and fat mass and its serum level is modulated by growth hormone

被引:58
作者
Abdallah, Basem M. [1 ]
Ding, Ming
Jensen, Charlotte H.
Ditzel, Nicholas
Flyvbjerg, Allan
Jensen, Thomas G.
Dagnaes-Hansen, Frederik
Gasser, Juerg A.
Kassem, Moustapha
机构
[1] Odense Univ Hosp, Dept Endocrinol, Clin Mol Endocrinol Treatment Lab, DK-5000 Odense, Denmark
[2] Odense Univ Hosp, Dept Orthopaed, Orthopaed Res Lab, DK-5000 Odense, Denmark
[3] Univ So Denmark, Dept Immunol & Microbiol, DK-5230 Odense, Denmark
[4] Aarhus Univ Hosp, Med Res Labs, Med Dept Diabet & Endocrinol, DK-8000 Aarhus, Denmark
[5] Aarhus Univ Hosp, DK-8000 Aarhus, Denmark
[6] John F Kennedy Inst, Natl Eye Clin, DK-2600 Glostrup, Denmark
[7] Pharma AG, Novartis Inst BioMed Res, CH-4002 Basel, Switzerland
关键词
D O I
10.1210/en.2007-0171
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Fat and bone metabolism are two linked processes regulated by several hormonal factors. Fetal antigen 1 (FA1) is the soluble form of dlk1 (delta-like 1), which is a member of the Notch-Delta family. We previously identified FA1 as a negative regulator of bone marrow mesenchymal stem cell differentiation. Here, we studied the effects of circulating FA1 on fat and bone mass in vivo by generating mice expressing high serum levels of FA1 (FA1 mice) using the hydrodynamic-based gene transfer procedure. We found that increased serum FA1 levels led to a significant reduction in total body weight, fat mass, and bone mass in a dose-dependent manner. Reduced bone mass in FA1 mice was associated with the inhibition of mineral apposition rate and bone formation rates by 58 and 72%, respectively. Because FA1 is colocalized with GH in the pituitary gland, we explored the possible modulation of serum FA1 by GH. Serum levels of IGF-I and IGF binding proteins did not change in FA1 mice, whereas increasing serum GH in normal mice using hydrodynamic-based gene transfer procedure dramatically reduced serum FA1 levels by 60%. Conversely, serum FA1 was increased 450% in hypophysectomized mice, and this high level was reduced by 40% during GH treatment. In conclusion, our data identify the FA1 as a novel endocrine factor regulating bone mass and fat mass in vivo, and its serum levels are regulated by GH. FA1 thus provides a novel class of developmental molecules that regulate physiological functions of the postnatal organisms.
引用
收藏
页码:3111 / 3121
页数:11
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