Apoptosis/drug effects; Bupleurum; Hepatic Stellate Cells/drug effects; Hepatocytes/drug effects; Lignans/pharmacology; Plant Extracts; Actins/metabolism; Apoptosis/radiation effects; Blotting, Western; Bupleurum/chemistry; Cell Movement/drug effects; Collagen Type I/metabolism; Extracellular Signal-Regulated MAP Kinases/antagonists & inhibitors; Extracellular Signal-Regulated MAP Kinases/metabolism; Fibrosis; Flow Cytometry; Gene Expression Regulation; Hep G2 Cells; Hepatic Stellate Cells/metabolism; Hepatic Stellate Cells/pathology; Hepatocytes/pathology; Hepatocytes/radiation effects; Humans; Lignans/isolation & purification; Microscopy, Confocal; Myosin-Light-Chain Kinase/antagonists & inhibitors; Myosin-Light-Chain Kinase/metabolism; NF-kappa B/metabolism; Oncogene Protein v-akt/antagonists & inhibitors; Oncogene Protein v-akt/metabolism; Phagocytosis; Plant Extracts/chemistry; Protein Kinase Inhibitors/pharmacology; Reverse Transcriptase Polymerase Chain Reaction; Time Factors; Ultraviolet Rays