title: Differential regulation of apolipoprotein A-I/ATP binding cassette transporter A1-mediated cholesterol and phospholipid release.
abstract: We compared apolipoprotein A-I (apoA-I)-mediated release of cellular cholesterol and phospholipid among several fibroblast cell lines. ApoA-I induced phospholipid release from WI-38, MRC-5, BALB/3T3, L929 and CHO-K1, but not from COS-7, while cholesterol was released only from WI-38, MRC-5 and BALB/3T3 without correlation to the cellular cholesterol content. The reaction consequently generated cholesterol-rich high density lipoprotein (HDL) with WI-38, MRC-5 and BALB/3T3, cholesterol-poor HDL with L929 and CHO-K1, and no HDL from COS-7. In contrast, diffusion-mediated cholesterol efflux to cyclodextrin took place with all the cell lines tested in proportion to the cellular free cholesterol content. While caveolin-1 was expressed in all of these cell lines, ATP-binding cassette transporter (ABC) A1 was detected in all but COS-7. We concluded that (1) fibroblasts were categorized into three groups with respect to the interaction with apoA-I, (i) those to produce cholesterol-rich HDL, (ii) cholesterol-poor HDL and (iii) no HDL; (2) ABCAl was required for the assembly of HDL from phospholipid among the cell lines tested; (3) caveolin-1 alone did not induce cholesterol incorporation into the HDL generated.
authors.affiliation: Biochemistry, Cell Biology and Metabolism, Nagoya City University Graduate School of Medical Sciences, Kawasumi 1, Mizuho-cho, Mizuho-ku, 467-8601, Nagoya, Japan.
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Yamauchi
authors.forename: Sumiko
authors.initials: S
authors.lastname: Abe-Dohmae
authors.forename: Shinji
authors.initials: S
authors.lastname: Yokoyama
mesh_terms: D000073738:2-Hydroxypropyl-beta-cyclodextrin; D016475:3T3 Cells; D064286:ATP Binding Cassette Transporter 1; D018528:ATP-Binding Cassette Transporters / Q000378:metabolism*; D000818:Animals; D016632:Apolipoprotein A-I / Q000378:metabolism*; D016466:CHO Cells; D019556:COS Cells; D051242:Caveolin 1; D022461:Caveolins / Q000378:metabolism; D002784:Cholesterol / Q000378:metabolism*; D008076:Cholesterol, HDL / Q000378:metabolism; D006224:Cricetinae; D003505:Cyclodextrins / Q000378:metabolism; D005347:Fibroblasts / Q000378:metabolism; D006801:Humans; D051379:Mice; D010743:Phospholipids / Q000378:metabolism*; D047392:beta-Cyclodextrins
chemical_list: D064286:ATP Binding Cassette Transporter 1; D018528:ATP-Binding Cassette Transporters; D016632:Apolipoprotein A-I; C495540:CAV1 protein, human; C495541:Cav1 protein, mouse; D051242:Caveolin 1; D022461:Caveolins; D008076:Cholesterol, HDL; D003505:Cyclodextrins; D010743:Phospholipids; D047392:beta-Cyclodextrins; D000073738:2-Hydroxypropyl-beta-cyclodextrin; D002784:Cholesterol