Abstract:
:Polycyclic aromatic hydrocarbons (PAHs), aryl hydrocarbon receptor (AHR) ligands, induce atherogenesis. Liver X receptor (LXR) alpha is known to be involved in the control of cholesterol homeostasis. Thus, the purpose of this study was to investigate the effects of 3-methlycholanthrene (MC), one of the PAHs, on LXRalpha-mediated signal transductions. We found that expression of mRNAs for ATP binding cassette A1, sterol regulatory element binding protein 1c (SREBP-1c), fatty acid synthase, and stearoyl-CoA desaturase was suppressed by treatment of HepG2 cells with MC. A luciferase reporter assay revealed that LXRalpha- and SREBP-1c-mediated transactivations were inhibited by MC via AHR. Based on these lines of evidence, we propose that down-regulation of the LXRalpha-regulated genes by PAHs is one of the causes responsible for atherosclerosis induced by PAHs.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Iwano S,Nukaya M,Saito T,Asanuma F,Kamataki Tdoi
10.1016/j.bbrc.2005.07.062subject
Has Abstractpub_date
2005-09-16 00:00:00pages
220-6issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(05)01541-Xjournal_volume
335pub_type
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