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• W4309541197 abstract "Apolipoprotein C-III (APOC-III) regulates triglyceride levels, associated with a risk of cardiovascular disease. One gene generates several proteoforms, each with a different molecular mass and a unique function. Unlike peptide multiple reaction monitoring (MRM), protein-MRM without digestion is required to analyze clinically relevant individual proteoforms. We developed a protein-MRM method without digestion to individually quantify APOC-III proteoforms in human serum. We optimized the protein-MRM method following 60% acetonitrile extraction with C18 filtration. Bovine serum and myoglobin served as supporting cushions and the internal standard during sample preparation, respectively. Furthermore, we evaluated the LOD, lower limit of quantification, linearity, accuracy, and precision. Good correlation compared with turbidimetric immunoassay (TIA) and peptide-MRM was observed using 30 clinical sera. Individual APOC-III O-glycoforms were identified by top-down proteomics and simultaneously quantified using the protein-MRM method. The sum abundance of APOC-III proteoforms was significantly correlated with TIA and peptide-MRM. Our protein-MRM method provides an affordable and rapid quantification of potential disease-specific proteoforms. Precise quantification of each proteoform allows investigators to identify novel biological roles potentially related to cardiovascular disease or novel biomarkers. We expect our protein-oriented method to be more clinically useful than antibody-based immunoassays and peptide-oriented MRM analysis, especially for quantification of a biomarker proteoform with certain post-translational modifications." @default.
• W4309541197 created "2022-11-28" @default.
• W4309541197 creator A5020293969 @default.
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• W4309541197 date "2022-11-21" @default.
• W4309541197 modified "2023-10-16" @default.
• W4309541197 title "Simultaneous Quantification of Apolipoprotein C-III <i>O</i>-Glycoforms by Protein-MRM" @default.
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• W4309541197 doi "https://doi.org/10.1021/acs.jproteome.2c00490" @default.
• W4309541197 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36412001" @default.
• W4309541197 hasPublicationYear "2022" @default.
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