Linked Life Data

7742069

Source:http://linkedlifedata.com/resource/pubmed/id/7742069

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1995-6-13
pubmed:abstractText
In previous studies with cortisol, betamethasone and oxazacort we attributed glucocorticoid effects on bone biomechanics to changes in bone mass and geometry rather than to an action on bone material properties. In this experiment, groups of 7 rats each received subcutaneous doses of 15.6, 31.2, 62.5, 125, 250, 500 or 1000 micrograms/kg per day of dexamethasone (DMS) and an additional 14 animals were controlled untreated for 4 weeks. Their fresh femurs were then scanned by peripheral quantitative computerized tomography (pQCT; XCT-960, Stratec, Germany) at the midshaft and submitted to three-point bending tests. In consonance with our earlier investigations, a significant, log-dose-related reduction in bone load-bearing capacity was observed, associated with an impairment in bone geometric properties (cross-sectional area and moment of inertia) and in body weight gain. However, the pQCT-assessed volumetric mineral density of cortical bone (vCtBMD; regarded as a material quality indicator in terms of mineralization) was significantly reduced by DMS following a dose-response relationship. Furthermore, a direct association was detected between vCtBMD and diaphyseal load-bearing capacity and stiffness. In contrast with our previous approach, data suggests that, apart from changes in bone geometric properties, glucocorticoid effects on bone material quality--as assessed by vCtBMD changes in this study--seem also to play a significant role in the determination of their biomechanical consequences.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
8756-3282
pubmed:author
pubmed:issnType
Print
pubmed:volume
16
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
119-24
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Dexamethasone effects on mechanical, geometric and densitometric properties of rat femur diaphyses as described by peripheral quantitative computerized tomography and bending tests.
pubmed:affiliation
Centro de Estudios de Metabolismo Fosfocálcio (CEMFoC), Universidad Nacional de Rosario, Argentina.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't