Targeted deletion of hepatocyte ABCA1 leads to very low density lipoprotein triglyceride overproduction and low density lipoprotein hypercatabolism

Soonkyu Chung, Jenelle M. Timmins, MyNgan Duong, Chiara Degirolamo, Shunxing Rong, Janet K. Sawyer, Roshni R. Singaraja, Michael R. Hayden, Nobuyo Maeda, Lawrence L. Rudel, Gregory S. Shelness, John S. Parks

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Loss of ABCA1 activity in Tangier disease (TD) is associated with abnormal apoB lipoprotein (Lp) metabolism in addition to the complete absence of high density lipoprotein (HDL). We used hepatocyte-specific ABCA1 knock-out (HSKO) mice to test the hypothesis that hepatic ABCA1 plays dual roles in regulating Lp metabolism and nascent HDL formation. HSKO mice recapitulated the TD lipid phenotype with postprandial hypertriglyceridemia, markedly decreased LDL, and near absence of HDL. Triglyceride (TG) secretion was 2-fold higher in HSKO compared with wild type mice, primarily due to secretion of larger TG-enriched VLDL secondary to reduced hepatic phosphatidylinositol 3-kinase signaling. HSKO mice also displayed delayed clearance of postprandial TG and reduced post-heparin plasma lipolytic activity. In addition, hepatic LDLr expression and plasma LDL catabolism were increased 2-fold in HSKO compared with wild type mice. Last, adenoviral repletion of hepatic ABCA1 in HSKO mice normalized plasma VLDL TG and hepatic phosphatidylinositol 3-kinase signaling, with a partial recovery of HDL cholesterol levels, providing evidence that hepatic ABCA1 is involved in the reciprocal regulation of apoB Lp production and HDL formation. These findings suggest that altered apoB Lp metabolism in TD subjects may result from hepatic VLDL TG overproduction and increased hepatic LDLr expression and highlight hepatic ABCA1 as an important regulatory factor for apoB-containing Lp metabolism.

Original languageEnglish (US)
Pages (from-to)12197-12209
Number of pages13
JournalJournal of Biological Chemistry
Volume285
Issue number16
DOIs
StatePublished - Apr 16 2010

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LDL Lipoproteins
Hepatocytes
Lipoproteins
Apolipoproteins B
HDL Lipoproteins
Metabolism
Liver
Tangier Disease
Phosphatidylinositol 3-Kinase
Knockout Mice
Triglycerides
Plasmas
HDL Cholesterol
Heparin
very low density lipoprotein triglyceride
Thermodynamic properties
Hypertriglyceridemia
Lipids
Recovery
Phenotype

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

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Targeted deletion of hepatocyte ABCA1 leads to very low density lipoprotein triglyceride overproduction and low density lipoprotein hypercatabolism. / Chung, Soonkyu; Timmins, Jenelle M.; Duong, MyNgan; Degirolamo, Chiara; Rong, Shunxing; Sawyer, Janet K.; Singaraja, Roshni R.; Hayden, Michael R.; Maeda, Nobuyo; Rudel, Lawrence L.; Shelness, Gregory S.; Parks, John S.

In: Journal of Biological Chemistry, Vol. 285, No. 16, 16.04.2010, p. 12197-12209.

Research output: Contribution to journalArticle

Chung, S, Timmins, JM, Duong, M, Degirolamo, C, Rong, S, Sawyer, JK, Singaraja, RR, Hayden, MR, Maeda, N, Rudel, LL, Shelness, GS & Parks, JS 2010, 'Targeted deletion of hepatocyte ABCA1 leads to very low density lipoprotein triglyceride overproduction and low density lipoprotein hypercatabolism', Journal of Biological Chemistry, vol. 285, no. 16, pp. 12197-12209. https://doi.org/10.1074/jbc.M109.096933
Chung, Soonkyu ; Timmins, Jenelle M. ; Duong, MyNgan ; Degirolamo, Chiara ; Rong, Shunxing ; Sawyer, Janet K. ; Singaraja, Roshni R. ; Hayden, Michael R. ; Maeda, Nobuyo ; Rudel, Lawrence L. ; Shelness, Gregory S. ; Parks, John S. / Targeted deletion of hepatocyte ABCA1 leads to very low density lipoprotein triglyceride overproduction and low density lipoprotein hypercatabolism. In: Journal of Biological Chemistry. 2010 ; Vol. 285, No. 16. pp. 12197-12209.
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