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- W2000751851 abstract "Human periodontal ligament (PDL) fibroblasts, cultured from extracted healthy premolars, and a cloned osteogenic cell line (MC3T3-E1) were used in this study to determine the effect of intermittent pressure on bone resorption. Cells (1 x 10(5] were incubated with BGJb medium in the presence or absence of the following factors: intermittent negative (-30 g/cm2) or positive (30 g/cm2) hydrostatic pressure and interleukin-1 beta (IL-1 beta, 1 ng/mL), for 24 h. Conditioned media (CM) generated from cultures of either cell types were used for prostaglandin E (PGE) assay, bone resorption assay, and assessment of osteoclast (OC)-like cell formation. Unstimulated PDL fibroblasts or MC3T3-E1 cells produced measurable amounts of PGE and bone-resorbing activity as measured by 45Ca released from mouse calvaria and OC-like cells. IL-1 beta-treated cells showed significantly elevated levels of PGE, bone resorption, and OC-like cell formation, as compared with unstimulated cells. Intermittent positive pressure (IPP) alone stimulated PGE production, but the resultant CM did not stimulate bone resorption or OC-like cell formation when IPP was applied to either cell type. The application of IPP, together with IL-1 beta in CM, caused a slight increase in the number of alpha-like cells, as compared with that of IL-1 beta-treated CM in both cell types. On the other hand, direct application of IPP on mouse bone-marrow cultures significantly increased the number of OC-like cells. This effect was additive in combination with either CM from unstimulated cells or exogenous addition of PGE2.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
- W2000751851 created "2016-06-24" @default.
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- W2000751851 date "1991-01-01" @default.
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- W2000751851 title "Involvement of PGE Synthesis in the Effect of Intermittent Pressure and Interleukin-1β on Bone Resorption" @default.
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- W2000751851 doi "https://doi.org/10.1177/00220345910700010401" @default.
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