Abstract:
:Hypertriglyceridemia results from accumulation of triglyceride (TG)-rich lipoproteins (TRLs) in the circulation and is associated with increased CVD risk. ApoC-III is an apolipoprotein on TRLs and a prominent negative regulator of TG catabolism. We recently established that in vivo apoC-III predominantly inhibits LDL receptor-mediated and LDL receptor-related protein 1-mediated hepatic TRL clearance and that apoC-III-enriched TRLs are preferentially cleared by syndecan-1 (SDC1). In this study, we determined the impact of apoE, a common ligand for all three receptors, on apoC-III metabolism using apoC-III antisense oligonucleotide (ASO) treatment in mice lacking apoE and functional SDC1 (Apoe-/-Ndst1f/fAlb-Cre+). ApoC-III ASO treatment significantly reduced plasma TG levels in Apoe-/-Ndst1f/fAlb-Cre+ mice without reducing hepatic VLDL production or improving hepatic TRL clearance. Further analysis revealed that apoC-III ASO treatment lowered plasma TGs in Apoe-/-Ndst1f/fAlb-Cre+ mice, which was associated with increased LPL activity in white adipose tissue in the fed state. Finally, clinical data confirmed that ASO-mediated lowering of APOC-III via volanesorsen can reduce plasma TG levels independent of the APOE isoform genotype. Our data indicate that apoE determines the metabolic impact of apoC-III as we establish that apoE is essential to mediate inhibition of TRL clearance by apoC-III and that, in the absence of functional apoE, apoC-III inhibits tissue LPL activity.
journal_name
J Lipid Resjournal_title
Journal of lipid researchauthors
Ramms B,Patel S,Nora C,Pessentheiner AR,Chang MW,Green CR,Golden GJ,Secrest P,Krauss RM,Metallo CM,Benner C,Alexander VJ,Witztum JL,Tsimikas S,Esko JD,Gordts PLSMdoi
10.1194/jlr.M093740subject
Has Abstractpub_date
2019-08-01 00:00:00pages
1379-1395issue
8eissn
0022-2275issn
1539-7262pii
jlr.M093740journal_volume
60pub_type
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