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Cell Biol Int. 2007 Dec;31(12):1456-61. Epub 2007 Jun 29.

Interleukin-10 inhibits the down-regulation of ATP binding cassette transporter A1 by tumour necrosis factor-alpha in THP-1 macrophage-derived foam cells.

Author information

1
Department of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jie-Fang Avenue, Wuhan, Hubei Province 430022, China.

Abstract

It is suggested that cholesterol efflux mediated by ATP binding cassette transporter A1 (ABCA1) plays an important role in anti-atherogenesis. However, the effects of inflammatory cytokines on ABCA1 expression and cholesterol accumulation in foam cells are little known. This study investigates the effects of tumour necrosis factor-alpha (TNF-alpha) and interleukin-10 (IL-10) on ABCA1 expression and cholesterol content in THP-1 macrophage-derived foam cells. ABCA1mRNA and protein levels were determined by RT-PCR and Western blot, respectively. The total cholesterol content in THP-1 macrophage-derived foam cells was detected by the zymochemistry method. Results revealed that TNF-alpha could increase cholesterol content by down-regulating ABCA1 expression in a time-dependent manner in THP-1 macrophage-derived foam cells, which may contribute to its pro-atherosclerotic effect. In addition IL-10 time-dependently decreased cholesterol accumulation by up-regulating ABCA1 expression and inhibited the down-regulation of ABCA1 by TNF-alpha in THP-1 macrophage-derived foam cells, which may be one of the mechanisms of IL-10 contributing to its anti-atherosclerotic action.

PMID:
17689273
DOI:
10.1016/j.cellbi.2007.06.009
[Indexed for MEDLINE]

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