A Robust Human Liver Organoid Model of Hepatitis B Virus Infection.

The hepatitis B virus (HBV) only robustly infects primary human hepatocytes. This strict viral host and cell tropism has hampered the development of physiologically relevant in vitro culture models of HBV infection. Primary human hepatocytes (PHH) are robustly infected by HBV but are short-lived in tissue culture and rapidly lose their hepatocyte characteristics. Human tissue-derived liver organoids are a novel in vitro physiologically relevant model that supports infection by HBV and mitigates the limitations of PHH. Liver organoids are established by placing tissue fragments into a three-dimensional (3D) basement membrane-rich matrix dome bathed in medium containing supplements and growth factors to support organoid growth. The organoids can be expanded in vitro, cryopreserved, and are genetically stable. The expansion phase organoids, once differentiated to a hepatocyte phenotype, support HBV infection. We couple liver organoids with an adenoviral delivery system to achieve robust HBV infection. This robust model supports the full HBV virus replication cycle.