Document Detail

3Beta-hydroxysteroid dehydrogenase activity in human osteoblast-like cells.
MedLine Citation:
PMID:  9622301     Owner:  NLM     Status:  MEDLINE    
This paper describes for the first time the presence of 3beta-hydroxysteroid dehydrogenase (3beta-HSD) activity in osteoblast-like cells and investigates its characteristics. 3beta-HSD activity was detected by the formation of androstenedione from [3H]dehydroepiandrosterone (DHEA) in whole cell assays of human osteoblast-like cells, HOS and MG-63. The radiolabeled product, androstenedione, was purified by thin-layer chromatography and identified by recrystallization on admixture with authentic androstenedione to show constant specific activities. The apparent Michaelis constant (Km) for DHEA in HOS was found to be 9.9 microM and that in MG-63 was 80.4 microM. The expression of the 3beta-HSD messenger ribonucleic acid in HOS and MG-63 was demonstrated through a reverse transcription-polymerase chain reaction. The PCR products were confirmed by Southern blot analysis. The existence of 3beta-HSD in osteoblast-like cells indicates that these cells convert delta5 androgens into more biologically active delta4 3-keto steroids. These results, together with the demonstration of other steroid converting enzyme systems, suggest that the osteoblast cells play an important role in facilitating hormonal action in bone tissue.
Y Kuwano; H Fujikawa; A Watanabe; K Shimodaira; A Sekizawa; H Saito; T Yanaihara
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Endocrine journal     Volume:  44     ISSN:  0918-8959     ISO Abbreviation:  Endocr. J.     Publication Date:  1997 Dec 
Date Detail:
Created Date:  1998-08-07     Completed Date:  1998-08-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9313485     Medline TA:  Endocr J     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  847-53     Citation Subset:  IM    
Department of Obstetrics and Gynecology, Showa University, Tokyo, Japan.
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MeSH Terms
3-Hydroxysteroid Dehydrogenases / genetics,  metabolism*
Cell Line
Osteoblasts / enzymology*
Polymerase Chain Reaction / methods
RNA, Messenger / analysis
Transcription, Genetic
Reg. No./Substance:
0/RNA, Messenger; EC 1.1.-/3-Hydroxysteroid Dehydrogenases

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