title: A comparison of the mouse and human lipoproteome: suitability of the mouse model for studies of human lipoproteins.
abstract: Plasma levels of low density lipoproteins (LDL) and high density lipoproteins (HDL) exhibit opposing associations with cardiovascular disease in human populations and mouse models have been heavily used to derive a mechanistic understanding of these relationships. In humans, recent mass spectrometry studies have revealed that the plasma lipoproteome is significantly more complex than originally appreciated. This is particularly true for HDL which contains some 90 distinct proteins, a majority of which play functional roles that go beyond those expected for simple lipid transport. Unfortunately, the mouse lipoproteome remains largely uncharacterized-a significant gap given the heavy reliance on the model. Using a gel filtration chromatography and mass spectrometry analysis that targets phospholipid-bound plasma proteins, we compared the mouse lipoproteome and its size distribution to a previous, identical human analysis. We identified 113 lipid associated proteins in the mouse. In general, the protein diversity in the LDL and HDL size ranges was similar in mice versus humans, though some distinct differences were noted. For the majority of proteins, the size distributions, that is, whether a given protein was associated with large versus small HDL particles, for example, were also similar between species. Again, however, there were clear differences exhibited by a minority of proteins that may reflect metabolic differences between species. Finally, by correlating the lipid and protein size profiles, we identified five proteins that closely track with the major HDL protein, apolipoprotein A-I across both species. Thus, mice have most of the minor proteins identified in human lipoproteins that play key roles in inflammation, innate immunity, proteolysis and its inhibition, and vitamin transport. This provides support for the continued use of the mouse as a model for many aspects of human lipoprotein metabolism.
authors.affiliation: †Center for Lipid and Arteriosclerosis Science, Department of Pathology and Laboratory Medicine, University of Cincinnati, 2120 East Galbraith Road, Cincinnati, Ohio 45237-0507, United States.
authors.forename: Scott M
authors.initials: SM
authors.lastname: Gordon
authors.affiliation: ‡Division of Biomedical Informatics, Cincinnati Children's Hospital Research Foundation, 3333 Burnet Avenue, MLC 7024, Cincinnati, Ohio 45229-3039, United States.
authors.forename: Hailong
authors.initials: H
authors.lastname: Li
authors.affiliation: ‡Division of Biomedical Informatics, Cincinnati Children's Hospital Research Foundation, 3333 Burnet Avenue, MLC 7024, Cincinnati, Ohio 45229-3039, United States.
authors.forename: Xiaoting
authors.initials: X
authors.lastname: Zhu
authors.affiliation: §Department of Pediatrics, Cincinnati Children's Hospital Research Foundation, 3333 Burnet Avenue, MLC 7012, Cincinnati, Ohio 45229-3039, United States.
authors.forename: Amy S
authors.initials: AS
authors.lastname: Shah
authors.affiliation: ‡Division of Biomedical Informatics, Cincinnati Children's Hospital Research Foundation, 3333 Burnet Avenue, MLC 7024, Cincinnati, Ohio 45229-3039, United States.
authors.forename: L Jason
authors.initials: LJ
authors.lastname: Lu
authors.affiliation: †Center for Lipid and Arteriosclerosis Science, Department of Pathology and Laboratory Medicine, University of Cincinnati, 2120 East Galbraith Road, Cincinnati, Ohio 45237-0507, United States.
authors.forename: W Sean
authors.initials: WS
authors.lastname: Davidson
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D008074:Lipoproteins / Q000737:chemistry*; D051379:Mice; D008810:Mice, Inbred C57BL; D008956:Models, Chemical; D020543:Proteome; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D008074:Lipoproteins; D020543:Proteome
keywords: apolipoprotein; high density lipoprotein; lipoprotein; mass spectrometry; mouse model; proteomics