Abstract
AbstractLeptin has been advocated as a centrally acting factor responsible for inhibiting accumulation of bone mass. However, recent investigations unequivocally establish leptin as a local (autocrine) factor expressed by osteoblasts. Exogenously added leptin causes osteoblastic cell proliferation and differentiation, while also rendering osteoblasts more efficacious in terms of mineralization. Leptin acts as an anti‐apoptotic agent, and augments messages responsible for the remodelling of bone tissue, i.e., mRNAs for osteoprotegerin (OPG) and the interleukin IL‐6. Furthermore, leptin message is readily expressed in osteoblasts subjected to mechanical strain. In this respect, osteoblasts, which are unilaterally stretched proliferate and differentiate, a phenomenon being potentiated by exposure of the cells to differentiating humoral factors. This article discusses a unified model of dually acting leptin through the central nervous system and the mechanostat principle applied to osteoblasts. The proposed model may account for the finely tuned bone homeostasis maintained within rather narrow limits, depending on exposure to humoral factors and the prevailing mechanostat usage mode. © 2002 Wiley‐Liss, Inc.
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Dates
Type | When |
---|---|
Created | 22 years, 6 months ago (Feb. 7, 2003, 6:08 p.m.) |
Deposited | 1 year, 10 months ago (Oct. 9, 2023, 4:39 p.m.) |
Indexed | 1 year ago (Aug. 24, 2024, 9:54 p.m.) |
Issued | 22 years, 7 months ago (Jan. 13, 2003) |
Published | 22 years, 7 months ago (Jan. 13, 2003) |
Published Online | 22 years, 7 months ago (Jan. 13, 2003) |
Published Print | 22 years, 6 months ago (March 1, 2003) |
@article{Gordeladze_2003, title={A unified model for the action of leptin on bone turnover}, volume={88}, ISSN={1097-4644}, url={http://dx.doi.org/10.1002/jcb.10385}, DOI={10.1002/jcb.10385}, number={4}, journal={Journal of Cellular Biochemistry}, publisher={Wiley}, author={Gordeladze, Jan O. and Reseland, Janne E.}, year={2003}, month=jan, pages={706–712} }