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Original Article |
Correspondence to: Shinji Yokoyama
High density lipoprotein (HDL) is assembled by interaction of apolipoprotein A-I with human monocytic leukemia cell line THP-1 by removing cellular cholesterol and phospholipid. Although the HDL formed with undifferentiated THP-1 cells contained only phosphatidylcholine and almost no cholesterol, the cells differentiated with phorbol 12-myristate 13-acetate (PMA) generated HDL enriched in cholesterol. The extent of cholesterol enrichment related to the cellular cholesterol level in the differentiated cells, but only weakly in the undifferentiated cells. In contrast, the differentiation had no influence on the diffusion-mediated cellular cholesterol efflux. The undifferentiated cells expressed the messages of ATP-binding cassette transporter 1 and caveolin-1, at low levels, and the PMA-induced differentiation resulted in substantial expression of both messages. Caveolin-1 protein expression was also highly induced by the PMA treatment of THP-1 cells. When the cells were treated with the antisense DNA of caveolin-1 and differentiated, both caveolin-1 synthesis and cholesterol incorporation into the HDL were reduced in parallel to generate the cholesterol-poor HDL.
We concluded that caveolin-1 is involved in enrichment with cholesterol of the HDL generated by the apolipoprotein-cell interaction. This function is independent of the assembly of HDL particles with cellular phospholipid and of nonspecific, diffusion-mediated efflux of cellular cholesterol. — Arakawa, R., S. Abe-Dohmae, M. Asai, J-i. Ito, and S. Yokoyama. Involvement of caveolin-1 in cholesterol enrichment of high density lipoprotein during its assembly by apolipoprotein and THP-1 cells. J. Lipid Res. 2000. 41: 1952;–1962.
Supplementary key words: cholesterol efflux, ABC1, PMA
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