Cited by 72Lipid metabolism and disordersLipid metabolism and biosynthesisPeroxisome Proliferator-Activated Receptors

Angiopoietin-like 4 promotes the intracellular cleavage of lipoprotein lipase by PCSK3/furin in adipocytes

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Dijk, Wieneke, Ruppert, Philip M.M., Oost, Lynette J., Kersten, Sander·2018·Journal of Biological Chemistry

Abstract

Lipoprotein lipase (LPL) catalyzes the breakdown of circulating triglycerides in muscle and fat. LPL is inhibited by several proteins, including angiopoietin-like 4 (ANGPTL4), and may be cleaved by members of the proprotein convertase subtilisin/kexin (PCSK) family. Here, we aimed to investigate the cleavage of LPL in adipocytes by PCSKs and study the potential involvement of ANGPTL4. A substantial portion of LPL in mouse and human adipose tissue was cleaved into N- and C-terminal fragments. Treatment of different adipocytes with the PCSK inhibitor decanoyl-RVKR-chloromethyl ketone markedly decreased LPL cleavage, indicating that LPL is cleaved by PCSKs. Silencing of Pcsk3 / furin significantly decreased LPL cleavage in cell culture medium and lysates of 3T3-L1 adipocytes. Remarkably, PCSK-mediated cleavage of LPL in adipocytes was diminished by Angptl4 silencing and was decreased in adipocytes and adipose tissue of Angptl4 −/− mice. Differences in LPL cleavage between Angptl4 −/− and WT mice were abrogated by treatment with decanoyl-RVKR-chloromethyl ketone. Induction of ANGPTL4 in adipose tissue during fasting enhanced PCSK-mediated LPL cleavage, concurrent with decreased LPL activity, in WT but not Angptl4 −/− mice. In adipocytes, after removal of cell surface LPL by heparin, levels of N-terminal LPL were still markedly higher in WT compared with Angptl4 −/− adipocytes, suggesting that stimulation of PCSK-mediated LPL cleavage by ANGPTL4 occurs intracellularly. Finally, treating adipocytes with insulin increased full-length LPL and decreased N-terminal LPL in an ANGPTL4-dependent manner. In conclusion, ANGPTL4 promotes PCSK-mediated intracellular cleavage of LPL in adipocytes, likely contributing to regulation of LPL in adipose tissue. Our data provide further support for an intracellular action of ANGPTL4 in adipocytes.

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Authors
Dijk, W., Ruppert, P. M. M., Oost, L. J., & Kersten, S.
Affiliations
Wageningen University & Research (NL)
Corresponding author
Kersten, Sander
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2018-09
Volume
293
Issue
36
Pages
14134-14145
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2884453662
Cited by
72
References
52
Citations by year
2026: 3 · 2025: 9 · 2024: 5 · 2023: 5 · 2022: 8 · 2021: 14 · 2020: 14 · 2019: 12 · 2018: 2
FWCI
7.93
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Socio-Environmental Systems Modeling (submittedVersion, cc-by)
  • HAL (submittedVersion)
  • Radboud Repository (Radboud University) (submittedVersion)
  • Radboud Repository (Radboud University) (submittedVersion, other-oa)
  • Data Archiving and Networked Services (DANS) (submittedVersion, cc-by)
Funders
Fondation Leducq (12CVD04)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Lipid metabolism and disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
Keywords
ANGPTL4, lipoprotein lipase, furin, adipocytes, adipose tissue, fasting, insulin, triglyceride metabolism
MeSH terms
Angiopoietin-Like Protein 4, Animals, Humans, Insulin, Lipoprotein Lipase, Adipocytes, 3T3-L1 Cells, Furin, Mice

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