New data concerning the function of osteocytes as the central regulators of bone homeostasis are briefly outlined. It is established that osteocytes are the main target cells for parathormone. They are a rich source of sclerostin, the main inhibitor of osteoblast activity, and of the RANKL cytokine, the most important regulator of osteoclastogenesis. Under shear stress causing microinjury, osteocytes enter programmed cell death (apoptosis) and osteocyte apoptosis is a signal for nearby healthy osteocytes to activate osteoclasts to resorb bone.
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http://dx.doi.org/10.5604/15093492.1193009 | DOI Listing |
Expert Opin Pharmacother
January 2025
Department of Endocrinology, 424 General Military Hospital, Thessaloniki, Greece.
Introduction: Osteoporosis is a metabolic skeletal disease characterized by low bone mass and strength, and increased risk for fragility fractures. It is a major health issue in aging populations, due to fracture associated increased disability and mortality. Antiresorptive treatments are first line choices in most of the cases.
View Article and Find Full Text PDFInt J Mol Sci
December 2024
Research Center for High Altitude Medicine, Qinghai University, Xining 810001, China.
Osteoporosis, a prevalent metabolic bone disorder, is characterized by reduced bone density and increased fracture risk. The pathogenesis of osteoporosis is closely associated with an imbalance in bone remodeling, in which the resorption function of osteoclasts exceeds the formation function of osteoblasts. Hypoxia has been implicated in the promotion of osteoclast differentiation and the subsequent development of osteoporosis.
View Article and Find Full Text PDFMolecules
December 2024
Graduate School of Pharmaceutical Sciences, Hiroshima International University, 5-1-1, Hirokoshingai, Kure 737-0112, Japan.
Farnesoid X receptor (FXR), a nuclear receptor, is expressed in calvaria and bone marrow stromal cells and plays a role in bone homeostasis. However, the mechanism of FXR-activated osteoblast differentiation remains unclear. In this study, we investigated the regulatory mechanism underlying FXR-activated osteoblast differentiation using bone morphogenetic protein-2 (BMP-2)-induced mouse ST-2 mesenchymal stem cells.
View Article and Find Full Text PDFJ Orthop Surg Res
January 2025
Department of Oral and Maxillofacial Surgery - Head & Neck Oncology, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, 639 Zhizaoju Road, Shanghai, 200011, China.
The study aims to elucidate the mechanism through which 17β-estradiol facilitates osteogenic differentiation in bone marrow mesenchymal stem cells (BMSCs). In our study, lentiviral transfection was employed to establish apoptosis repressor with caspase recruitment domain (ARC) knockdown or overexpression in BMSCs. The impact of 17β-estradiol on ARC expression was assessed using western blot, RT-PCR and immunofluorescence.
View Article and Find Full Text PDFNat Metab
January 2025
Laboratory of Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium.
Bone lengthening and fracture repair depend on the anabolic properties of chondrocytes that function in an avascular milieu. The limited supply of oxygen and nutrients calls into question how biosynthesis and redox homeostasis are guaranteed. Here we show that glucose metabolism by the pentose phosphate pathway (PPP) is essential for endochondral ossification.
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