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Toxicol Sci. 2019 Jan 17. doi: 10.1093/toxsci/kfz015. [Epub ahead of print]

Dose effects of ammonium perfluorooctanoate on lipoprotein metabolism in APOE*3-Leiden.CETP mice.

Author information

1
The Netherlands Organization of Applied Scientific Research (TNO), Metabolic Health Research, Gaubius Laboratory, CK, Leiden, The Netherlands.
2
Cardiology, Leiden University Medical Center, ZA Leiden, The Netherlands.
3
Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, ZA Leiden, The Netherlands.
4
Medical Department, 3M Company, St Paul, Minnesota, USA.
5
The Netherlands Organization of Applied Scientific Research (TNO) - Microbiology and Systems Biology, HE, Zeist, The Netherlands.

Abstract

Epidemiological studies have reported positive associations between serum PFOA and total and non-high-density lipoprotein cholesterol (non-HDL-C) although the magnitude of effect of PFOA on cholesterol lacks consistency. The objectives of this study were to evaluate the effect of PFOA on plasma cholesterol and triglyceride metabolism at various plasma PFOA concentrations relevant to humans, and to elucidate the mechanisms using APOE*3-Leiden.CETP mice, a model with a human-like lipoprotein metabolism.APOE*3-Leiden.CETP mice were fed a Western-type diet with PFOA (10, 300, 30000 ng/g/d) for 4 - 6 weeks. PFOA exposure did not alter plasma lipids in the 10 and 300 ng/g/d dietary PFOA dose groups. At 30000 ng/g/d, PFOA decreased plasma triglycerides (TG), total cholesterol (TC) and non-HDL-C, whereas HDL-C was increased. The plasma lipid alterations could be explained by decreased very low-density lipoprotein (VLDL) production and increased VLDL clearance by the liver through increased lipoprotein lipase activity. The concomitant increase in HDL-C was mediated by decreased cholesteryl ester transfer activity and changes in gene expression of proteins involved in HDL metabolism. Hepatic gene expression and pathway analysis confirmed the changes in lipoprotein metabolism that were mediated for a major part through activation of the peroxisome proliferator-activated receptor (PPAR)α.Our data confirmed the findings from a phase 1 clinical trial in humans that demonstrated high serum or plasma PFOA levels resulted in lower cholesterol levels. The study findings do not show an increase in cholesterol at environmental or occupational levels of PFOA exposure, thereby indicating these findings are associative rather than causal.

PMID:
30657992
DOI:
10.1093/toxsci/kfz015

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