Research Article |
Open Access |
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Hepatic Endosome Protein Profiling in Apolipoprotein E
Deficient Mice Expressing Apolipoprotein B48 but not B100 |
AnShu Chen, ZhongMao Guo, LiChun Zhou and Hong Yang * |
Department of Comparative Biosciences, University of Illinois, 2001 S. Lincoln Avenue, Urbana, IL, USA |
*Corresponding author: |
Dr. Hong Yang
Department of Physiology
Meharry Medical College, Nashville, TN
Tel: (615) 327-5772
Fax: (615) 3212949
E-mail:hyang@mmc.edu |
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Received September 10, 2010; Accepted September 23, 2010; Published September 23, 2010 |
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Citation: Chen A, Guo Z, Zhou L, Yang H (2010) Hepatic Endosome Protein
Profiling in Apolipoprotein E Deficient Mice Expressing Apolipoprotein B48 but not
B100. J Bioanal Biomed 2: 100-106. doi:10.4172/1948-593X.1000031 |
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Copyright: © 2010 Chen A, et al. This is an open-access article distributed
under the terms of the Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any medium, provided the
original author and source are credited. |
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Abstract |
Liver cells absorb apolipoprotein (Apo) B48-carrying lipoproteins in ApoE's absence, albeit not as efficiently as
the ApoE-mediated process. Our objective was to identify differentially expressed hepatic endosome proteins in
mice expressing ApoB48 but lacking ApoE and ApoB100 expression (ApoE-/-/B48/48). We purified early and late
endosomes from ApoE-/-/B48/48 and wild-type mouse's livers. In ApoE-/-/B48/48 mouse's hepatic endosomes,
proteomic analysis revealed elevated protein levels of major urinary protein 6 (MUP), calreticulin, protein disulfide
isomerases (PDI) A1, and A3. These proteins are capable of interacting with lipids/lipoproteins and triggering receptormediated
endocytosis. In addition, hepatic endosomes from ApoE-/- /B48/48 mice exhibited significantly reduced protein
levels of haptoglobin, hemopexin, late endosome/lysosome interacting protein, cell division control protein 2 homolog,
γ-soluble Nethylmaleimide- sensitive factor attachment protein, vacuolar ATP synthase catalytic subunit A1, dipeptidyl
peptidases II, cathepsin B, D, H, and Z. These proteins participate in plasma heme clearance, receptor-mediated
signaling, membrane fusion, endosomal/lysosomal acidification, and protein degradation. The significance of increasing
endosomal MUP, calreticulin and PDIs in ApoE-/-/B48/48 mouse liver cells is not clear; however, reducing endosomal/
lysosomal membrane proteins and hydrolases might be, at least partially, responsible for the retarded clearance of
plasma ApoB-carrying lipoproteins in ApoE-/-/B48/48 mice.
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