Glucose induced hepatic lipase expression and ApoB100/ApoAI ratio changes in cultured HepG2 cells in vitro

Backgroundː Hepatic lipase (HL) plays a very important role in lipoprotein catabolism. The aim of this study was to measure both HL activity and ApoB100/ApoAI ratio changes in cell secretions by incubating HepG2 cells with various amounts of glucose. Methodsː HepG2 cells were cultured in low-, normal- or high-glucose Dulbecco's Modified Eagle Medium (DMEM) (1, 4.5 and 10g/L, respectively). HL activities were determined using the Hepatic Lipase Detection Kit (cat. no. A067) from Nanjing Jiancheng Bioengineering Institute (Nanjing, China). Levels of ApoAI and ApoB100 were measured with commercial sandwich enzyme-linked immunosorbent assay kits (cat#: H0123 and H0124) from ShangHai MEIXUAN Biological Science and Technology Ltd (Shanghai, China). Experiments were repeated six times for each assay. Resultsː Pearson’s correlation coefficient results showed that ApoB100 and ApoB100/ApoAI ratio have positive and significant correlations with HL activity, and ApoAI has a negative and significant correlation with HL activity. Conclusionsː Glucose may increase or decrease ApoB100/ApoAI ratio through upregulation or downregulation of hepatic lipase activity, which suggests a new regulatory pathway in lipoprotein catabolism. This finding may lead to novel therapeutic ways for diagnosis and treatment for coronary artery disease.