Differential effects of scavenger receptor BI deficiency on lipid metabolism in cells of the arterial wall and in the liver

M Van Eck*, J Twisk, M Hoekstra, BT Van Rij, CAC Van der Lans, IST Bos, JK Kruijt, F Kuipers, TJC Van Berkel

*Corresponding author voor dit werk

    OnderzoeksoutputAcademicpeer review

    208 Citaten (Scopus)

    Samenvatting

    Scavenger receptor class B, type I (SRBI) is a key regulator of high density lipoprotein (HDL) metabolism. It facilitates the efflux of cholesterol from cells in peripheral tissues to HDL and mediates the selective uptake of cholesteryl esters from HDL in the liver. We investigated the effects of SRBI deficiency in the arterial wall and in the liver using SRBI-deficient mice and wild-type littermates fed a Western-type diet. The SRBI-deficient mice showed massive accumulation of cholesterol-rich HDL in the circulation, reflecting impaired delivery to the liver. Strikingly, SRBI deficiency did not alter hepatic cholesterol ( ester) content nor did it affect the expression of key regulators of hepatic cholesterol homeostasis, including HMG-CoA reductase, the low density lipoprotein receptor, and cholesterol 7alpha-hydroxylase. However, a similar to40% reduction in biliary cholesterol content was observed, and the expression of ABCG8 and ABCG5, ATP half-transporters implicated in the transport of sterols from the liver to the bile, was attenuated by 70 and 35%, respectively. In contrast to the situation in the liver, SRBI deficiency did result in lipid deposition in the aorta and atherosclerosis. Vascular mRNA analysis showed increased expression of inflammatory markers as well as of genes involved in cellular cholesterol homeostasis. Our data show that, although hepatic cholesterol homeostasis is maintained upon feeding a Western-type diet, SRBI deficiency is associated with de-regulation of cholesterol homeostasis in the arterial wall that results in an increased susceptibility to atherosclerosis.

    Originele taal-2English
    Pagina's (van-tot)23699-23705
    Aantal pagina's7
    TijdschriftThe Journal of Biological Chemistry
    Volume278
    Nummer van het tijdschrift26
    DOI's
    StatusPublished - 27-jun.-2003

    Vingerafdruk

    Duik in de onderzoeksthema's van 'Differential effects of scavenger receptor BI deficiency on lipid metabolism in cells of the arterial wall and in the liver'. Samen vormen ze een unieke vingerafdruk.

    Citeer dit