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Myostatin (GDF8) is a negative regulator of skeletal muscle growth and mice lacking myostatin show a significant increase in muscle mass and bone density compared to normal mice. In order to further define the role of myostatin in regulating bone mass we sought to determine if loss of myostatin function significantly altered the potential for osteogenic differentiation in bone marrow-derived mesenchymal...
Neurotransmitter regulation of bone metabolism has been a subject of increasing interest and investigation. We reported previously that osteoblastic cells express a functional serotonin (5-HT) signal transduction system, with mechanisms for responding to and regulating uptake of 5-HT. The clonal murine osteocytic cell line, MLO-Y4, demonstrates expression of the serotonin transporter (5-HTT), and...
Neurotransmitter regulation of bone metabolism has been the subject of increasing interest and investigation. Because serotonin (5-HT) plays a role as a regulator of craniofacial morphogenesis, we investigated the expression and function of 5-HT receptors and the 5-HT transporter (5-HTT) in bone. Primary cultures of rat osteoblasts (rOB) and a variety of clonal osteoblastic cell lines, including ROS...
Rapid phosphorylation of many G-protein-coupled receptors (GPCRs) by G-protein-coupled receptor kinases (GRKs) accompanies stimulus-driven desensitization. Recent evidence suggests that GRKs and their associated arresting proteins, β-arrestins, function as essential elements in the GPCR-mediated mitogen-activated protein (MAP) kinase signaling cascade. We investigated the interaction between GRKs...
Renal insufficiency is known to increase plasma fluoride levels, which may increase the risk of fluorosis and osteomalacia. The purpose of this study was to determine the effects of fluoride on skeletal fragility and mineralization in renal-deficient animals. We evaluated the skeleton of rats with surgically induced renal deficiency (45 nephrectomy) that were chronically exposed to fluoridated water...
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