HepG2 cells were cultured in a 6-well plate and treat with various concentrations of MLE. Fallowing treatments, cells were washed three times with iced PBS and fixed with 4% paraformalin for 60 min. After fixation, cells were washed and stained with Oil Red solution (stock solution, 3 mg/ml in isopropanol; working solution, 60% Oil Red stock solution
and 40% distilled water) for 10 min at room temperature. After staining, cells were washed with PBS to removed
unbound dye, and then observed under a microscope (Olympus, Tokyo