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Impaired ATP‐binding cassette transporter A1‐mediated sterol efflux from oxidized LDL‐loaded macrophages

Favari, Elda, Zimetti, Francesca, Bortnick, Anna E., Adorni, Maria Pia, Zanotti, Ilaria, Canavesi, Monica, Bernini, Franco·2005·FEBS Letters
DOI 10.1016/j.febslet.2005.10.042
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Abstract

We investigated the interaction of oxidized low density lipoprotein (OxLDL) with the ATP‐binding cassette A1 (ABCA1) pathway in J774 macrophages. Cellular efflux to apolipoprotein AI (apo‐AI) of OxLDL‐derived cholesterol was lower than efflux of cholesterol derived from acetylated low density lipoprotein (AcLDL). ABCA1 upregulation by 8‐(4‐chlorophenylthio)adenosine 3′:5′‐cyclic monophosphate (cpt‐cAMP) or 22 (R)‐hydroxycholesterol (22‐OH) and 9‐cis retinoic acid (9cRA) increased the efflux to apo‐AI of cellular sterols derived from AcLDL, but not of those from OxLDL. AcLDL, but not OxLDL, induced ABCA1 protein content and activity in J774. However, OxLDL did not influence J774 ABCA1 upregulation by cpt‐cAMP or 22‐OH/9cRA. We conclude that sterols released to cells by OxLDL are available neither as substrate nor as modulator of ABCA1.

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Research works printed but not linked: 26

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Metadata

Authors
Favari, E., Zimetti, F., Bortnick, A. E., Adorni, M. P., Zanotti, I., Canavesi, M., & Bernini, F.
Venue
FEBS Letters
Publisher
Wiley
Published
2005-11-02
Volume
579
Issue
29
Pages
6537-6542
ISSN
  • 0014-5793
  • 1873-3468
DOI
10.1016/j.febslet.2005.10.042
Cited by
22
References
0
Language
en
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor)

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