Document Detail


Dexamethasone promotes expression of membrane-bound macrophage colony-stimulating factor in murine osteoblast-like cells.
MedLine Citation:
PMID:  9492032     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The mechanisms by which glucocorticosteroids promote osteoclastogenesis in vitro are uncertain. As macrophage colony-stimulating factor (MCSF) is critical for osteoclastogenesis, we hypothesized that glucocorticosteroids might regulate membrane-bound MCSF (mMCSF) and soluble MCSF (sMCSF) production by stromal cells or osteoblasts. ST2 cells or murine calvarial osteoblasts (MOBs) were treated with dexamethasone (Dex; 100 nM) and/or 1,25-dihydroxyvitamin D [1,25(OH)2D; 10 nM] for 3 days. Control values for mMCSF and sMCSF as units per 100,000 cells were 9 +/- 1.4 and 511 +/- 56 in ST2 cells and 5.9 +/- 0.8 and 379 +/- 47 in MOB cells, respectively. Dex increased mMCSF to 156 +/- 16% and 143 +/- 26% compared with the control value in ST2 and MOB cells, respectively, whereas 1,25-(OH)2D caused increases of 195 +/- 16% and 164 +/- 21%. In the presence of both Dex and 1,25-(OH)2D, mMCSF increased to 209 +/- 24% and 216 +/- 26% in the two cell types, respectively. 1,25-(OH)2D caused modest increases in sMCSF, as expected, in both cell types (153 +/- 6% and 122 +/- 4%). Dex inhibited 1,25-(OH)2D-stimulated sMCSF (115 +/- 7% of control) in ST2 cells. Analysis of mMCSF transcript levels by semiquantitative RT-PCR revealed Dex-stimulated increases of 170 +/- 11% in ST2 cells and 126 +/- 16% in MOB cells compared with the control level. The increased expression of the transcript for sMCSF in the presence of Dex and 1,25-(OH)2D, measured by both RT-PCR and Northern analysis (219 +/- 53% and 242%, respectively), despite inhibition of sMCSF protein, indicated that the inhibitory effect of Dex in ST2 cells was posttranscriptional. Half-life studies showed that Dex prolonged MCSF messenger RNA from 2.8 to 7.5 h. These results suggest that Dex influences osteoclastogenesis by increasing the expression of mMCSF by accessory cells in culture.
Authors:
J Rubin; D M Biskobing; L Jadhav; D Fan; M S Nanes; S Perkins; X Fan
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Endocrinology     Volume:  139     ISSN:  0013-7227     ISO Abbreviation:  Endocrinology     Publication Date:  1998 Mar 
Date Detail:
Created Date:  1998-03-12     Completed Date:  1998-03-12     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0375040     Medline TA:  Endocrinology     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1006-12     Citation Subset:  AIM; IM; S    
Affiliation:
Department of Medicine, Emory University, and Veterans Affairs Medical Center, Atlanta, Georgia 30033, USA. jrubi02@emory.edu
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Animals
Cells, Cultured
Dexamethasone / pharmacology*
Dose-Response Relationship, Drug
Enzyme-Linked Immunosorbent Assay
Macrophage Colony-Stimulating Factor / biosynthesis*,  genetics
Mice
Mice, Inbred C57BL
Osteoblasts / drug effects,  metabolism*
RNA, Messenger / analysis
Grant Support
ID/Acronym/Agency:
AR-42360/AR/NIAMS NIH HHS
Chemical
Reg. No./Substance:
0/RNA, Messenger; 50-02-2/Dexamethasone; 81627-83-0/Macrophage Colony-Stimulating Factor

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


Previous Document:  The greater glycan content of recombinant human thyroid peroxidase of mammalian than of insect cell ...
Next Document:  Regulation of leptin promoter function by Sp1, C/EBP, and a novel factor.