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- W2159400530 abstract "Of the 1,328 genes revealed by microarray to be differentially regulated by disuse, or at 8 h following a single short period of osteogenic loading of the mouse tibia, analysis by predicting associated transcription factors from annotated affinities revealed the transcription factor EGR2/Krox-20 as being more closely associated with more pathways and functions than any other. Real time quantitative PCR confirmed up-regulation of Egr2 mRNA expression by loading of the tibia in vivo. In vitro studies where strain was applied to primary cultures of mouse tibia-derived osteoblastic cells and the osteoblast UMR106 cell line also showed up-regulation of Egr2 mRNA expression. In UMR106 cells, inhibition of β1/β3 integrin function had no effect on strain-related Egr2 expression, but it was inhibited by a COX2-selective antagonist and imitated by exogenous prostaglandin E2 (PGE2). This response to PGE(2) was mediated chiefly through the EP1 receptor and involved stimulation of PKC and attenuation by cAMP/PKA. Neither activators nor inhibitors of nitric oxide, estrogen signaling, or LiCl had any effect on Egr2 mRNA expression, but it was increased by both insulin-like growth factor-1 and high, but not low, dose parathyroid hormone and exogenous Wnt-3a. The increases by strain, PGE2, Wnt-3a, and phorbol 12-myristate 13-acetate were attenuated by inhibition of MEK-1. EGR2 appears to be involved in many of the signaling pathways that constitute early responses of bone cells to strain. These pathways all have multiple functions. Converting their strain-related responses into coherent instructions for adaptive (re)modeling is likely to depend upon their contextual activation, suppression, and interaction probably on more than one occasion." @default.
- W2159400530 created "2016-06-24" @default.
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- W2159400530 date "2012-02-01" @default.
- W2159400530 modified "2023-10-10" @default.
- W2159400530 title "Loading-related Regulation of Transcription Factor EGR2/Krox-20 in Bone Cells Is ERK1/2 Protein-mediated and Prostaglandin, Wnt Signaling Pathway-, and Insulin-like Growth Factor-I Axis-dependent" @default.
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- W2159400530 doi "https://doi.org/10.1074/jbc.m111.252742" @default.
- W2159400530 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3281728" @default.
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