Document Detail


Osteoclast formation and activity in the pathogenesis of osteoporosis in rheumatoid arthritis.
MedLine Citation:
PMID:  12421995     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: Rheumatoid arthritis (RA) is often complicated by generalized osteopenia due to increased bone resorption by osteoclasts. We analysed a number of cellular and humoral factors that influence osteoclast formation from circulating precursors in RA patients. METHODS: Monocytes isolated from RA patients and normal controls were cultured with macrophage colony-stimulating factor (M-CSF) and nuclear factor-kappaB ligand (RANKL), or with RANKL-expressing UMR106 cells and 1,25 dihydroxyvitamin D(3) [1,25(OH)(2)D(3)]. Osteoclast differentiation was assessed by expression of tartrate-resistant acid phosphatase (TRAP) and vitronectin receptors (VNR) and lacunar resorption. RESULTS: Osteoclasts formed from RA patients exhibited increased resorptive activity but there was no difference in the relative proportion of circulating osteoclast precursors between RA patients and normal controls. Osteoclast precursors in RA patients were not more sensitive to the osteoclastogenic effects of 1,25(OH)(2)D(3), M-CSF or RANKL. Dexamethasone, but not interleukin (IL) 1beta, tumour necrosis factor alpha and IL-6, increased osteoclast formation and lacunar resorption. CONCLUSION: There is an increase in the extent of lacunar resorption carried out by osteoclasts formed from circulating precursors in RA patients. This is not due to an increase in the number of circulating precursors or increased sensitivity to the osteoclastogenic effects of 1,25(OH)(2)D(3), M-CSF, RANKL or inflammatory cytokines. Our findings suggest that increased osteoclast functional activity rather than osteoclast formation is more likely to play a role in the generalized bone loss that occurs in RA, and that corticosteroids stimulate osteoclast formation and resorption.
Authors:
T Hirayama; L Danks; A Sabokbar; N A Athanasou
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Rheumatology (Oxford, England)     Volume:  41     ISSN:  1462-0324     ISO Abbreviation:  Rheumatology (Oxford)     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-07     Completed Date:  2002-12-13     Revised Date:  2007-09-06    
Medline Journal Info:
Nlm Unique ID:  100883501     Medline TA:  Rheumatology (Oxford)     Country:  England    
Other Details:
Languages:  eng     Pagination:  1232-9     Citation Subset:  AIM; IM    
Affiliation:
Nuffield Department of Orthopaedic Surgery, University of Oxford, Nuffield Orthopaedic Centre, Oxford OX3 7LD, UK.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Arthritis, Rheumatoid / complications,  pathology
Bone Resorption / physiopathology
Carrier Proteins / pharmacology*
Case-Control Studies
Cell Division / physiology
Cells, Cultured
Cholecalciferol / pharmacology
Culture Media, Conditioned
Dexamethasone / pharmacology
Female
Humans
Interleukin-1 / pharmacology
Interleukin-6 / pharmacology
Macrophage Colony-Stimulating Factor / pharmacology*
Male
Membrane Glycoproteins / pharmacology*
Middle Aged
Monocytes
Osteoclasts / drug effects*,  physiology*
Osteoporosis / etiology,  pathology
RANK Ligand
Receptor Activator of Nuclear Factor-kappa B
Reference Values
Sensitivity and Specificity
Tumor Necrosis Factor-alpha / pharmacology
Chemical
Reg. No./Substance:
0/Carrier Proteins; 0/Culture Media, Conditioned; 0/Interleukin-1; 0/Interleukin-6; 0/Membrane Glycoproteins; 0/RANK Ligand; 0/Receptor Activator of Nuclear Factor-kappa B; 0/TNFRSF11A protein, human; 0/TNFSF11 protein, human; 0/Tumor Necrosis Factor-alpha; 50-02-2/Dexamethasone; 67-97-0/Cholecalciferol; 81627-83-0/Macrophage Colony-Stimulating Factor
Comments/Corrections
Comment In:
Rheumatology (Oxford). 2003 Nov;42(11):1429-30   [PMID:  14578447 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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