Document Detail

Differential stimulation of fos and jun family members by calcitriol in osteoblastic cells.
MedLine Citation:
PMID:  1791829     Owner:  NLM     Status:  MEDLINE    
We have looked at the effects of calcitriol (1 alpha,25-dihydroxyvitamin D3) on the expression of the members of the fos and jun families of protooncogenes in an osteoblastic cell line and in primary cultures of osteoblasts. Calcitriol treatment of starved, confluent cultures of MC3T3-E1 cells induced a rapid and transient stimulation of the expression of c-fos, fos-B, c-jun, and jun-B with varying kinetics. The expression of fra-1 and jun-D was not affected by calcitriol in those cells. The selective stimulation of fos and jun family members by calcitriol was also observed in primary cultures of osteoblasts isolated from newborn mouse calvaria, suggesting that this modulation is a physiological response of the bone cells and not an artefact of the established cell line. The calcitriol effect was specific and dose-dependent. The expression of the c-Fos protein correlated with the expression of the mRNA in calcitriol-treated cells. The calcitriol-induced stimulation of c-fos expression was modulated, at least in part, at the level of the initiation and elongation of transcription, whereas its effects on c-jun and jun-B expression was controlled at the posttranscriptional level by a mechanism that does not implicate stabilization of their respective mRNAs. The differential stimulation of the expression of certain members of the fos and jun families by calcitriol support a role for these oncoproteins in bone cell physiology.
G A Candeliere; J Prud'homme; R St-Arnaud
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Molecular endocrinology (Baltimore, Md.)     Volume:  5     ISSN:  0888-8809     ISO Abbreviation:  Mol. Endocrinol.     Publication Date:  1991 Dec 
Date Detail:
Created Date:  1992-03-31     Completed Date:  1992-03-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8801431     Medline TA:  Mol Endocrinol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1780-8     Citation Subset:  IM    
Genetics Unit, Shriners Hospital for Crippled Children, Montréal, Québec, Canada.
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MeSH Terms
Blotting, Northern
Calcitriol / pharmacology*
Cells, Cultured
Dose-Response Relationship, Drug
Fluorescent Antibody Technique
Gene Expression / drug effects
Osteoblasts / chemistry,  cytology,  metabolism*
Proto-Oncogene Proteins c-fos / analysis,  genetics*,  metabolism
Proto-Oncogene Proteins c-jun / analysis,  genetics*,  metabolism
RNA, Messenger / analysis,  genetics
Transcription, Genetic / drug effects
Reg. No./Substance:
0/Proto-Oncogene Proteins c-fos; 0/Proto-Oncogene Proteins c-jun; 0/RNA, Messenger; 32222-06-3/Calcitriol

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

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