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- W2033774515 abstract "Parathyroid hormone (PTH) and glycogen synthase kinase-3 (GSK-3) inhibitor 603281-31-8, administered once daily increased bone formation in vivo. We investigated the molecular mechanisms of the anabolic responses of PTH and 603281-31-8 in rat osteopenia model. Female 6-month-old rats were ovariectomized (Ovx) and permitted to lose bone for 1 month, followed by treatment with PTH (1-38) at 10 microg/kg/day s.c. or 603281-31-8 at 3 mg/kg/day p.o. for 60 days. Twenty-four hours after the last treatment, RNA from distal femur metaphysis was subjected to gene expression analysis. Differentially expressed genes (P<0.05) were subjected to pathway analysis to delineate relevant bio-processes involved in skeletal biology. Genes involved in morphogenesis, cell growth/differentiation, and apoptosis were significantly altered by Ovx and the treatments. Analysis of morphogenesis genes showed an overrepresentation of genes involved in osteogenesis, chondrogenesis, and adipogenesis. A striking finding was that Ovx decreased several markers of osteogenesis/chondrogenesis and increased markers of adipogenesis/lipid metabolism. Treatment with either PTH or the GSK-3 inhibitor reversed these effects, albeit at different levels. Histological analysis confirmed that osteopenia in Ovx animals was associated with three-fold increase in marrow adiposity. PTH and GSK-3 inhibitor restored bone volume, and reversed or normalized marrow adiposity. Ex vivo studies showed that PTH and GSK-3 inhibitor increased the ratio of colony forming marrow stromal progenitors (CFU-fs) that were alkaline phosphatase positive (putative osteoblasts). Our results suggest that the bone anabolic actions of PTH and GSK-3 inhibitor in vivo involve concerted effects on mesenchymal lineages; osteoblasts, chondrocytes, and adipocytes." @default.
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- W2033774515 date "2007-05-22" @default.
- W2033774515 modified "2023-10-15" @default.
- W2033774515 title "Changes in Osteoblast, Chondrocyte, and Adipocyte Lineages Mediate the Bone Anabolic Actions of PTH and Small Molecule GSK-3 Inhibitor" @default.
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- W2033774515 doi "https://doi.org/10.1002/jcb.21374" @default.
- W2033774515 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17520664" @default.
- W2033774515 hasPublicationYear "2007" @default.
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