Document Detail


Epidermal growth factor and 1alpha,25-dihydroxyvitamin D3 suppress lipogenesis in hamster sebaceous gland cells in vitro.
MedLine Citation:
PMID:  11676839     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We have previously reported the establishment of a culture system of hamster auricular sebocytes. Although their morphologic and biochemical properties are very similar to those of human sebocytes, the regulation of lipogenesis is not clear. Therefore, we investigated the effect of epidermal growth factor, all-trans retinoic acid, 1alpha,25-dihydroxyvitamin D3, and androgens such as testosterone and 5alpha-dihydrotestosterone on lipogenesis in cultured hamster sebocytes. Intracellular lipid droplets detected with Oil-Red-O staining were observed in 5 d cultures and increased in a time-dependent manner; 40.7% +/- 1.11% of 2 wk cultured cells tested lipid-positive by flow cytometric analysis. When the hamster sebocytes were cultured in the presence of epidermal growth factor, all-trans retinoic acid, or 1alpha,25-dihydroxyvitamin D3, the intracellular lipid droplets were diminished by all-trans retinoic acid and epidermal growth factor, and slightly by 1alpha,25-dihydroxyvitamin D3. The intracellular lipid droplets consisted mainly of triglycerides (71.8%) and, as minor components, cholesterol (18.0%), wax esters (3.6%), and free fatty acids (6.6%). Epidermal growth factor and all-trans retinoic acid decreased the intracellular accumulation of triglycerides (92.6% and 96.1% inhibition, respectively) and free fatty acids (54.3% and 62.6% inhibition, respectively) in the sebocytes. In addition, 1alpha,25-dihydroxyvitamin D3 decreased the triglyceride level (34.3% inhibition), but augmented the accumulation of wax esters (30% increase). There was no difference in the level of cholesterol as a result of these treatments, however. In contrast, 5alpha-dihydrotestosterone augmented the formation of intracellular lipid droplets along with an increase in the accumulation of triglycerides in hamster sebocytes. Our findings that regulation of lipogenesis by all-trans retinoic acid and androgen in hamster sebocytes is identical to regulation in humans suggest that hamster sebocytes are useful for the elucidation of sebaceous function at the cellular level. Furthermore, this is the first evidence that epidermal growth factor and 1alpha,25-dihydroxyvitamin D3 may act as suppressors in the regulation of lipogenesis in hamster sebocytes in vitro.
Authors:
T Sato; N Imai; N Akimoto; T Sakiguchi; K Kitamura; A Ito
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of investigative dermatology     Volume:  117     ISSN:  0022-202X     ISO Abbreviation:  J. Invest. Dermatol.     Publication Date:  2001 Oct 
Date Detail:
Created Date:  2001-10-25     Completed Date:  2001-12-05     Revised Date:  2005-11-17    
Medline Journal Info:
Nlm Unique ID:  0426720     Medline TA:  J Invest Dermatol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  965-70     Citation Subset:  IM    
Affiliation:
Department of Biochemistry, Tokyo University of Pharmacy and Life Science, School of Pharmacy, Hachioji, Tokyo, Japan. satotak@ps.toyaku.ac.jp
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MeSH Terms
Descriptor/Qualifier:
Animals
Calcitriol / pharmacology*
Cells, Cultured
Cricetinae
Dihydrotestosterone
Epidermal Growth Factor / pharmacology*
Lipids / antagonists & inhibitors*,  biosynthesis,  chemistry
Male
Mesocricetus
Sebaceous Glands / cytology,  drug effects*,  metabolism*
Tretinoin / pharmacology
Chemical
Reg. No./Substance:
0/Lipids; 302-79-4/Tretinoin; 32222-06-3/Calcitriol; 521-18-6/Dihydrotestosterone; 62229-50-9/Epidermal Growth Factor

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


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