Autophagy Beclin-1--metabolism Class III Phosphatidylinositol 3-Kinases--metabolism Hep G2 Cells Hepatitis B virus--pathogenicity Humans Intracellular Signaling Peptides and Proteins--metabolism JNK Mitogen-Activated Protein Kinases--metabolism Reactive Oxygen Species--metabolism Trans-Activators--metabolism Viral Regulatory and Accessory Proteins