Abstract
Osteoporosis is characterized by low bone mineral density (BMD), resulting in increasing susceptibility to bone fractures. In men, it has been related to some diseases and toxic habits, but in some instances the cause of the primary—or idiopathic—osteoporosis is not apparent. In a previous study, our group compared histomorphometric measurements in cortical and cancellous bones from male idiopathic osteoporosis (MIO) patients to those of control subjects and found reduced bone formation without major differences in bone resorption. To confirm these results, this study analyzed the etiology of this pathology, examining the osteoblast behavior in vitro. We compared two parameters of osteoblast activity in MIO patients and controls: osteoblastic proliferation and gene expression of COL1A1 and osteocalcin, in basal conditions and with vitamin D3 added. All these experiments were performed from a first-passage osteoblastic culture, obtained from osteoblasts that had migrated from the transiliac explants to the plate. The results suggested that the MIO osteoblast has a slower proliferation rate and decreased expression of genes related to matrix formation, probably due to a lesser or slower response to some stimulus. We concluded that, contrary to female osteoporosis, in which loss of BMD is predominantly due to increased resorption, low BMD in MIO seems to be due to an osteoblastic defect.
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We thank the Instituto de Salud Carlos III for financial support (FIS-01-1422) and Elaine Lilly, PhD, of Writer’s First Aid for English language support.
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Ruiz-Gaspà, S., Blanch-Rubió, J., Ciria-Recasens, M. et al. Reduced Proliferation and Osteocalcin Expression in Osteoblasts of Male Idiopathic Osteoporosis. Calcif Tissue Int 86, 220–226 (2010). https://doi.org/10.1007/s00223-010-9336-5
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DOI: https://doi.org/10.1007/s00223-010-9336-5