Document Detail


ATP-binding cassette transporter A1 (ABCA1) in macrophages: a dual function in inflammation and lipid metabolism?
MedLine Citation:
PMID:  10725792     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Activated lipid-laden macrophages in the vascular wall are key modulators of the inflammatory processes underlying atherosclerosis. We demonstrate here that the ATP-binding cassette (ABC) transporter ABCA1 is induced during differentiation of human monocytes into macrophages. ABCA1 has been implicated in macrophage interleukin-1beta secretion and apoptosis. Moreover, ABCA1 mRNA and protein levels are strongly upregulated by uptake of modified LDL and downregulated by HDL(3)-mediated lipid efflux in macrophages. Mutation analysis in patients with the classical Tangier disease (TD), a monogenetic disorder characterized by hypersplenism, macrophage accumulation and deposition of cholesteryl esters in the reticuloendothelial system, low plasma HDL and premature atherosclerosis, revealed deleterious mutations in their ABCA1 gene. The localization pattern of the mutations within the ABCA1 protein appears to determine the tropism for either the reticuloendothelial system, as seen in the classical TD phenotype, or the artery wall, as in the case of HDL deficiency in the absence of splenomegaly. In a comprehensive analysis of the expression and regulation of all currently known human ABC transporters, we identified additional cholesterol-responsive genes that are induced during monocyte differentiation into macrophages. Our results indicate a dual regulatory function for ABCA1 in macrophage lipid metabolism and inflammation.
Authors:
G Schmitz; W E Kaminski; M Porsch-Ozcürümez; J Klucken; E Orsó; M Bodzioch; C Büchler; W Drobnik
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Pathobiology : journal of immunopathology, molecular and cellular biology     Volume:  67     ISSN:  1015-2008     ISO Abbreviation:  Pathobiology     Publication Date:  1999  
Date Detail:
Created Date:  2000-05-10     Completed Date:  2000-05-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9007504     Medline TA:  Pathobiology     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  236-40     Citation Subset:  IM    
Copyright Information:
Copyright 2000 S. Karger AG, Basel.
Affiliation:
Institute of Clinical Chemistry and Laboratory Medicine, University of Regensburg, Germany. gerd.schmitz@klinik.uni-regensburg.de
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MeSH Terms
Descriptor/Qualifier:
ATP-Binding Cassette Transporters / genetics,  metabolism*
Cells, Cultured
Cholesterol / metabolism
DNA, Complementary / analysis
Glycoproteins / genetics,  metabolism*
Humans
Hypolipoproteinemias / genetics
Lipoproteins, LDL / metabolism
Macrophages / cytology,  metabolism*
Monocytes / cytology,  metabolism
Mutation
RNA, Messenger / metabolism
Reverse Transcriptase Polymerase Chain Reaction
Up-Regulation
Chemical
Reg. No./Substance:
0/ATP binding cassette transporter 1; 0/ATP-Binding Cassette Transporters; 0/DNA, Complementary; 0/Glycoproteins; 0/Lipoproteins, LDL; 0/RNA, Messenger; 0/acetyl-LDL; 57-88-5/Cholesterol

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