,Overexpression of Hepatitis B Virus-binding Protein, Squamous Cell Carcinoma Antigen 1, Extends Ret

• 作 者: Hong-Bin XIA Xi-Gu CHEN
• 机 构: Center of Experimental Animals, Sun Yat-Sen University, Guangzhou 510089, China
• 出 处: 生物化学与生物物理学报（英文版）
• 发表日期: 2006年7期
• 关键词: HBV receptor HBV-binding protein minicircle DNA plasmid hydrodynamics-based proc

How receptors mediate the entry of hepatitis B virus (HBV) into the target liver cells is poorly understood. Recently, human squamous cell carcinoma antigen 1 (SCCA1) has been found to mediate binding and intealization of HBV to liver-derived cell lines in vitro. In this report, we investigate if SCCA1 is able to function as an HBV receptor and mediate HBV entry into mouse liver. SCCA1 transgene under the control of Rous sarcoma virus promoter was constructed in a minicircle DNA vector that was delivered to NOD/SCID mouse liver using the hydrodynamic technique. Subsequently, HBV-positive human serum was injected intravenously. We demonstrated that approximately 30% of the mouse liver cells expressed a high level of recombined SCCA1 protein for at least 37 d. The HBV surface antigen was found to persist in mouse liver for up to 17 d. Furthermore, HBV genome also persisted in mouse liver, as determined by polymerase chain reaction, for up to 17 d, and in mouse circulation for 7 d. These results suggest that SCAA1 might serve as an HBV receptor or co-receptor and play an important role in mediating HBV entry into hepatocytes, although its role in human HBV infection remains to be determined.