Feeding Angptl4-/- mice trans fat promotes foam cell formation in mesenteric lymph nodes without leading to ascites.

Abstract

Angiopoietin-like 4 (ANGPTL4) regulates plasma triglyceride levels by inhibiting LPL. Inactivation of ANGPTL4 decreases plasma triglycerides and reduces the risk of coronary artery disease. Unfortunately, targeting ANGPTL4 for the therapeutic management of dyslipidemia and atherosclerosis is hampered by the observation that mice and monkeys in which ANGPTL4 is inactivated exhibit lipid accumulation in the mesenteric lymph nodes (MLNs). In mice these pathological events exclusively unfold upon feeding a high saturated FA diet and are followed by an ultimately lethal pro-inflammatory response and chylous ascites. Here, we show that Angptl4-/- mice fed a diet rich in trans FAs develop numerous lipid-filled giant cells in their MLNs, yet do not have elevated serum amyloid and haptoglobin, do not exhibit ascites, and survive, unlike Angptl4-/- mice fed a saturated FA-rich diet. In RAW264.7 macrophages, the saturated FA, palmitate, markedly increased markers of inflammation and the unfolded protein response, whereas the trans-unsaturated elaidate and the cis-unsaturated oleate had the opposite effect. In conclusion, trans and saturated FAs have very distinct biological effects in macrophages. Furthermore, lipid accumulation in MLNs is uncoupled from activation of an acute-phase response and chylous ascites, suggesting that ANGPTL4 should not be fully dismissed as target for dyslipidemia.

• Authors: Antwi-Boasiako Oteng, Asmita Bhattacharya, Susanne Brodesser, Ling Qi, Nguan Soon Tan, Sander Kersten
• Journal: Journal of lipid research (J Lipid Res) Vol. 58 Issue 6 Pg. 1100-1113 (06 2017) ISSN: 1539-7262 [Electronic] United States
• PMID: 28412693 (Publication Type: Journal Article)
• Copyright: Copyright © 2017 by the American Society for Biochemistry and Molecular Biology, Inc.

Chemical References

• Acute-Phase Proteins
• Angiopoietin-Like Protein 4
• Dietary Fats
• Trans Fatty Acids

Topics

• Acute-Phase Proteins (metabolism)
• Angiopoietin-Like Protein 4 (deficiency)
• Animals
• Chylous Ascites (chemically induced, metabolism, pathology)
• Dietary Fats (adverse effects)
• Foam Cells (cytology, drug effects, pathology)
• Giant Cells (drug effects, pathology)
• Liver (drug effects, metabolism)
• Lymph Nodes (cytology, drug effects, pathology)
• Mesentery
• Mice
• Mice, Inbred C57BL
• Peritonitis (chemically induced, metabolism, pathology)
• RAW 264.7 Cells
• Trans Fatty Acids (adverse effects)