Premium
Cholesterol metabolism and expression of its relevant genes in cultured steatotic hepatocytes
Author(s) -
WANG Xiao Hong,
TIAN Yan,
GUO Zhao Jun,
FAN Zhu Ping,
QIU De Kai,
ZENG Min De
Publication year - 2009
Publication title -
journal of digestive diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 51
eISSN - 1751-2980
pISSN - 1751-2972
DOI - 10.1111/j.1751-2980.2009.00401.x
Subject(s) - ldl receptor , hepatocyte , downregulation and upregulation , intracellular , triglyceride , cholesterol , endocrinology , lipid metabolism , medicine , hmg coa reductase , palmitic acid , steatosis , reductase , biology , chemistry , lipoprotein , fatty acid , biochemistry , gene , enzyme , in vitro
OBJECTIVE: To investigate the cholesterol metabolism and mRNA expression of the relevant genes in cholesterol synthesis of the cultured steatotic hepatocytes model. METHODS: A steatotic model of hepatocytes was constructed by adding palmitic acid to the growing L‐02 cells. These cells were collected at day 3 and 6, respectively. Cells with the culture solution without palmitic acid added served as the control. The contents of intracellular triglyceride (TG) and total cholesterol (TC) were detected by the analysis kit. The expression of sterol‐regulatory element binding protein‐2 (SREBP‐2) and its target gene hydroxymethylglutaryl CoA reductase (HMGCR) and low‐density lipoprotein receptor (LDLR) were measured by RT‐PCR. RESULTS: Hepatocyte steatosis was observed at day 3 and became more intense at day 6. The contents of intracellular TG and TC were increased and the expression of the SREBP‐2, HMGCR and LDLR mRNA were upregulated in a time‐dependent manner in the model group. Compared with the control group, the content of intracellular TG was higher at both day 3 and 6 ( P < 0.05), while the content of intracellular TC was significantly increased only at day 6; The expression of HMGCR and LDLR mRNA was upregulated in steatotic hepatocytes at both day 3 and 6 ( P < 0.05), whereas the SREBP‐2 mRNA was increased only at day 6 ( P < 0.05). CONCLUSION: Cholesterol accumulation is probably due to the upregulated expression of the relevant genes in the cholesterol synthesis of the steatotic hepatocytes.