scholarly journals Fatty acids liberated from high-density lipoprotein phospholipids by endothelial-derived lipase are incorporated into lipids in HepG2 cells

2003 ◽  
Vol 371 (3) ◽  
pp. 981-988 ◽  
Author(s):  
Juliane G. STRAUSS ◽  
Marianne HAYN ◽  
Rudolt ZECHNER ◽  
Sanja LEVAK-FRANK ◽  
Sasa FRANK
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
High Density Lipoprotein ◽  
Hepg2 Cells ◽  
Fatty Acid Synthase ◽  
Density Lipoprotein ◽  
High Density ◽  
Hek 293 ◽  
Cellular Lipids ◽  
And Control

We previously reported that endothelial-derived lipase (EDL) efficiently hydrolyses high-density-lipoprotein-derived phosphatidycholine (HDL-PC). In the present study, we assessed the ability of EDL to supply HepG2 cells with non-esterified fatty acids (NEFA) liberated from HDL-phospholipids. For this purpose, HepG2 cells infected with adenovirus encoding human EDL (EDL-Ad), or with control β-galactosidase-expressing adenovirus (LacZ-Ad), were incubated with 14C-HDL-PC. The analysis of the cellular lipids by TLC revealed that EDL overexpression led to an increase in the amount of cellular 14C-lipids, whereby the label was mainly incorporated into phospholipids and triacylglycerols (TAG). Cells expressing mutant enzymically inactive EDL (MUT-EDL-Ad) contained similar amounts of 14C-TAG but higher amounts of 14C-phosphatidylcholine (PC) compared with LacZ-Ad-infected cells. The co-expression of CD36 augmented the EDL-mediated accumulation of 14C-lipids in HEK-293 cells. The quadrupole MS analysis of the cellular lipids revealed an increased content of PC and TAG in EDL-expressing HepG2 cells compared with MUT-EDL-Ad-expressing and control cells. However, the MUT-EDL-Ad-expressing cells contained more PC than control cells. Additionally, EDL overexpression led to a 2-fold decrease in the amount of fatty acid synthase mRNA and, in turn, a slightly, but significantly, decreased rate of fatty acid (FA) synthesis in HepG2 cells. In the present study, we show for the first time that EDL efficiently supplies HepG2 cells with NEFA derived from HDL-PL, thus affecting cellular lipid composition and FA synthesis.

Combined Detection of Free Fatty Acid (FFA) and High-Density Lipoprotein Cholesterol (HDL-C) is a Promising Pretreatment Biomarker for Predicting the Overall Prognosis (OS) of Neuroendocrine Tumours (NETs) in the Colorectum: A Case-Control Study.

2021 ◽  
Author(s):  
Bin Zhu ◽  
Dan Wu ◽  
Yuanyuan Yang ◽  
Pingli Yu ◽  
Haobo Huang ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Free Fatty Acid ◽  
High Density Lipoprotein ◽  
High Density Lipoprotein Cholesterol ◽  
Neuroendocrine Tumours ◽  
Tumour Size ◽  
Density Lipoprotein ◽  
High Density ◽  
Apolipoprotein A1 ◽  
Lipoprotein Cholesterol

Abstract Purpose The aim of the study was to evaluate the prognostic value of free fatty acid (FFA) and high-density lipoprotein cholesterol (HDL-C) in predicting colorectal neuroendocrine tumours (NETs). Methods One hundred patients with pathologically diagnosed colorectal NETs in 2011-2017 were enrolled, and the levels of FFA, HDL-C, low-density lipoproteincholesterol (LDL-C), triglycerides (TGs), cholesterol (CHOL), apolipoprotein A1 (ApoA1) and apolipoprotein B (ApoB) between colorectal NET patients and healthy controls matched by age and sex were compared. In addition, the association of clinicopathological characteristics and follow-up data with FFA and HDL-C was analysed. Results FFA was overexpressed (0.55±0.23 vs. 0.48±0.11, P= 0.006) and HDL-C was underexpressed (1.31±0.41 vs. 1.41±0.29, P=0.046) in colorectal NETs. FFA ≥0.52 mmol/L predicted lymph node metastasis (LNM) (χ2 = 5.964, P=0.015), and HDL-C ≤1.0 mmol/L predicted tumour size ≥2 cm (χ2 = 5.647, P=0.017). No significant association was found between FFA and tumour size (P=0.142) or HDL-C and LNM (P=0.443). FFA ≥0.52 mmol/L (χ2 = 6.016, P=0.014) and HDL-C ≤1.0 mmol/L predicted worse overall survival (OS) (χ2 = 5.488, P=0.019). FFA ≥0.52 mmol/L in combination with HDL-C ≤1.0 mmol/L predicted an even worse prognosis in terms of OS (χ2 = 4.818, P=0.028). Conclusion FFA ≥0.52 mmol/L and HDL-C ≤1.0 mmol/L were promising cut-off values in predicting LNM, tumour size and worse OS in colorectal NETs.

Sign in / Sign up

Export Citation Format

Share Document