Comparison of the Effect of trans Fatty Acid Isomers on Apolipoprotein A1 and B Secretion in HepG2 Cells.
Intake of trans fatty acid (TFA) is believed to change the ratio of low-density lipoprotein (LDL) to high density lipoprotein (HDL) cholesterol in blood, which leads to cardiovascular disease. In this study, thirteen types of TFA including monoene type TFA (trans-octadecenoic fatty acid isomers, t-18:1 isomers), diene type TFA (t9,t12-18:2), and triene type TFA (t-18:3) were added to cultured HepG2 cells to compare the amount of apolipoprotein A1 and B (those relating to levels of HDL and LDL cholesterol in blood, respectively) being secreted. We found that trans-5-18:1 increased the secretion of apolipoprotein B relative to oleic acid (cis-9-18:1, control). Secretion of apolipoprotein B was also increased by t-18:3; however, the amount was not significant compared with that observed in the control. The secretion amount of apolipoprotein B tended to increase with the number of double bonds in TFA among trans-9-18:1, t9,t12-18:2, and t-18:3. The secretion amount of apolipoprotein A1 after TFA treatment was also measured. No significant difference was detected among t-18:1 groups; however, t-18:3 increased the amount significantly compared to that in the control. These results suggest that the effect of TFA isomers on the ratio of LDL to HDL cholesterol in the blood follows a mechanism different from that in cultured cells.
['Nagao|Koji|K|', 'Yoshinaga|Kazuaki|K|', 'Nagai|Toshiharu|T|', 'Mizobe|Hoyo|H|', 'Yoshida|Akihiko|A|', 'Beppu|Fumiaki|F|', 'Gotoh|Naohiro|N|']
D016632:Apolipoprotein A-I D053299:Apolipoprotein B-100 D002318:Cardiovascular Diseases D008076:Cholesterol, HDL D008078:Cholesterol, LDL D056945:Hep G2 Cells D006801:Humans D007536:Isomerism D044242:Trans Fatty Acids
trans fatty acid isomer apolipoprotein secretion HepG2 cell