| Osteoblasts respond to pulsatile fluid flow with short-term increases in PGE(2) but no change in mineralization. | |
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MedLine Citation:
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PMID: 11299276 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Although there is no consensus as to the precise nature of the mechanostimulatory signals imparted to the bone cells during remodeling, it has been postulated that deformation-induced fluid flow plays a role in the mechanotransduction pathway. In vitro, osteoblasts respond to fluid shear stress with an increase in PGE(2) production; however, the long-term effects of fluid shear stress on cell proliferation and differentiation have not been examined. The goal of this study was to apply continuous pulsatile fluid shear stresses to osteoblasts and determine whether the initial production of PGE(2) is associated with long-term biochemical changes. The acute response of bone cells to a pulsatile fluid shear stress (0.6 +/- 0.5 Pa, 3.0 Hz) was characterized by a transient fourfold increase in PGE(2) production. After 7 days of static culture (0 dyn/cm(2)) or low (0.06 +/- 0.05 Pa, 0.3 Hz) or high (0.6 +/- 0.5 Pa, 3.0 Hz) levels of pulsatile fluid shear stress, the bone cells responded with an 83% average increase in cell number, but no statistical difference (P > 0.53) between the groups was observed. Alkaline phosphatase activity per cell decreased in the static cultures but not in the low- or high-flow groups. Mineralization was also unaffected by the different levels of applied shear stress. Our results indicate that short-term changes in PGE(2) levels caused by pulsatile fluid flow are not associated with long-term changes in proliferation or mineralization of bone cells. |
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Authors:
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E A Nauman; R L Satcher; T M Keaveny; B P Halloran; D D Bikle |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 90 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2001 May |
Date Detail:
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Created Date: 2001-04-12 Completed Date: 2001-07-05 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 1849-54 Citation Subset: IM; S |
Affiliation:
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Orthopaedic Biomechanics Laboratory, Department of Mechanical Engineering, University of California, Berkeley 94720-1740, USA. enauman@tulane.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Calcification, Physiologic / physiology* Cell Differentiation Cell Division Cells, Cultured Dinoprostone / biosynthesis* Femur Kinetics Male Osteoblasts / cytology*, physiology* Rats Rats, Sprague-Dawley Stress, Mechanical Tibia Time Factors |
| Chemical | |
Reg. No./Substance:
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363-24-6/Dinoprostone |
| Investigator | |
Investigator/Affiliation:
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B P Halloran / U CA, San Francisco; D D Bikle / U CA, San Francisco |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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