Expression and regulation of scavenger receptor class B type I (SR-BI) in gall bladder epithelium.
Gut
; 52(7): 1017-24, 2003 Jul.
Article
in En
| MEDLINE
| ID: mdl-12801960
ABSTRACT
BACKGROUND AND AIMS:
Biliary lipid absorption by the gall bladder mucosa and the cholesterol content of the gall bladder wall appear to play a role in cholesterol gall stone formation. As the scavenger receptor class B type I (SR- BI) regulates cellular cholesterol uptake, we studied its expression in human and murine gall bladders, its regulation by increased biliary lipid content, and its role in gall stone formation. METHODS ANDRESULTS:
Using immunohistochemistry, SR-BI was found in the apical domain of human gall bladder epithelial cells. Immunoblotting of isolated membranes from gall bladder epithelial cells showed a specific signal for the 82 kDa SR-BI protein. In C57BL/6 mice, SR-BI was also found in the gall bladder epithelium. Using western blot analysis, an inverse relationship was observed between biliary cholesterol concentration and SR-BI expression in murine gall bladder mucosa. By comparing lithogenic diet fed wild-type and SR-BI deficient mice, gall bladder wall cholesterol content and gall stone formation were not found to be dependent on SR-BI expression.CONCLUSIONS:
(i) SR-BI is expressed in both human and murine gall bladder epithelium; (ii) biliary cholesterol hypersecretion is associated with decreased gall bladder SR-BI expression in mice; and (iii) murine SR-BI is not essential in controlling gall bladder wall cholesterol content and gall stone formation during diet induced cholelithiasis.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Receptors, Immunologic
/
Cholelithiasis
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Gene Expression Regulation
/
Receptors, Lipoprotein
/
CD36 Antigens
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Gallbladder
/
Membrane Proteins
Limits:
Animals
/
Humans
Language:
En
Journal:
Gut
Year:
2003
Document type:
Article
Affiliation country:
Chile
Country of publication:
ENGLAND
/
ESCOCIA
/
GB
/
GREAT BRITAIN
/
INGLATERRA
/
REINO UNIDO
/
SCOTLAND
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UK
/
UNITED KINGDOM