title: Bone marrow-derived HL mitigates bone marrow-derived CETP-mediated decreases in HDL in mice globally deficient in HL and the LDLr.
abstract: The objective of this study was to determine the combined effects of HL and cholesteryl ester transfer protein (CETP), derived exclusively from bone marrow (BM), on plasma lipids and atherosclerosis in high-fat-fed, atherosclerosis-prone mice. We transferred BM expressing these proteins into male and female double-knockout HL-deficient, LDL receptor-deficient mice (HL(-/-)LDLr(-/-)). Four BM chimeras were generated, where BM-derived cells expressed 1) HL but not CETP, 2) CETP and HL, 3) CETP but not HL, or 4) neither CETP nor HL. After high-fat feeding, plasma HDL-cholesterol (HDL-C) was decreased in mice with BM expressing CETP but not HL (17 ± 4 and 19 ± 3 mg/dl, female and male mice, respectively) compared with mice with BM expressing neither CETP nor HL (87 ± 3 and 95 ± 4 mg/dl, female and male mice, respectively, P < 0.001 for both sexes). In female mice, the presence of BM-derived HL mitigated this CETP-mediated decrease in HDL-C. BM-derived CETP decreased the cholesterol component of HDL particles and increased plasma cholesterol. BM-derived HL mitigated these effects of CETP. Atherosclerosis was not significantly different between BM chimeras. These results suggest that BM-derived HL mitigates the HDL-lowering, HDL-modulating, and cholesterol-raising effects of BM-derived CETP and warrant further studies to characterize the functional properties of these protein interactions.
authors.affiliation: Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA 92037.
authors.forename: Neil J
authors.initials: NJ
authors.lastname: Hime
authors.affiliation: Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA 92037.
authors.forename: Audrey S
authors.initials: AS
authors.lastname: Black
authors.affiliation: Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA 92037.
authors.forename: David J
authors.initials: DJ
authors.lastname: Bonnet
authors.affiliation: Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA 92037.
authors.forename: Linda K
authors.initials: LK
authors.lastname: Curtiss
mesh_terms: D000818:Animals; D050197:Atherosclerosis / Q000201:enzymology; D001853:Bone Marrow / Q000201:enzymology; D016026:Bone Marrow Transplantation; D053480:Cholesterol Ester Transfer Proteins / Q000502:physiology*; D008076:Cholesterol, HDL / Q000097:blood*; D059305:Diet, High-Fat / Q000009:adverse effects; D005260:Female; D008049:Lipase / Q000502:physiology*; D008297:Male; D057507:Mice, 129 Strain; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D010743:Phospholipids / Q000097:blood; D011973:Receptors, LDL / Q000235:genetics* / Q000378:metabolism; D014280:Triglycerides / Q000097:blood
chemical_list: D053480:Cholesterol Ester Transfer Proteins; D008076:Cholesterol, HDL; D010743:Phospholipids; D011973:Receptors, LDL; D014280:Triglycerides; D008049:Lipase; C495700:Lipc protein, mouse
keywords: atherosclerosis; cholesterol; cholesteryl ester transfer protein; hepatic lipase; high density lipoprotein; low density lipoprotein receptor