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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Bailey, Dana Ruel, Isabelle Hafiane, Anouar Cochrane, Haley Iatan, Iulia Jauhiainen, Matti Ehnholm, Christian Krimbou, Larbi Genest, Jacques |
| Description | Country affiliation: Canada Author Affiliation: Bailey D ( Cardiovascular Genetics Laboratory, Cardiology Division, McGill University Health Centre/Royal Victoria Hospital, Québec, Canada.) |
| Abstract | The specifics of nascent HDL remodeling within the plasma compartment remain poorly understood. We developed an in vitro assay to monitor the lipid transfer between model nascent HDL (LpA-I) and plasma lipoproteins. Incubation of alpha-(125)I-LpA-I with plasma resulted in association of LpA-I with existing plasma HDL, whereas incubation with TD plasma or LDL resulted in conversion of alpha-(125)I-LpA-I to prebeta-HDL. To further investigate the dynamics of lipid transfer, nascent LpA-I were labeled with cell-derived [(3 )H]cholesterol (UC) or [(3)H]phosphatidylcholine (PC) and incubated with plasma at 37 degrees C. The majority of UC and PC were rapidly transferred to apolipoprotein B (apoB). Subsequently, UC was redistributed to HDL for esterification before being returned to apoB. The presence of a phospholipid transfer protein (PLTP) stimulator or purified PLTP promoted PC transfer to apoB. Conversely, PC transfer was abolished in plasma from PLTP(-/-) mice. Injection of (125)I-LpA-I into rabbits resulted in a rapid size redistribution of (125)I-LpA-I. The majority of [(3)H]UC from labeled r(HDL) was esterified in vivo within HDL, whereas a minority was found in LDL. These data suggest that apoB plays a major role in nascent HDL remodeling by accepting their lipids and donating UC to the LCAT reaction. The finding that nascent particles were depleted of their lipids and remodeled in the presence of plasma lipoproteins raises questions about their stability and subsequent interaction with LCAT. |
| File Format | HTM / HTML |
| ISSN | 00222275 |
| e-ISSN | 15397262 |
| DOI | 10.1194/jlr.M001875 |
| Journal | The Journal of Lipid Research |
| Issue Number | 4 |
| Volume Number | 51 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology |
| Publisher Date | 2010-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Discipline Biochemistry Apolipoproteins B Physiology High-density Lipoproteins, Pre-beta Chemistry Lipoproteins Animals Apolipoprotein A-i Blood Metabolism Apolipoprotein E3 Cholesterol Cholesterol Ester Transfer Proteins Genetics Esterification Hep G2 Cells Administration & Dosage Isolation & Purification Lipoproteins, Hdl Mice Mice, Knockout Phospholipid Transfer Proteins Rabbits Tangier Disease Time Factors Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Endocrinology |
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