Multisite Injection of Bioengineered Hepatic Units from Collagen Hydrogel and Neonatal Liver Cells in Parenchyma Improves Liver Cirrhosis.

Intrahepatic transplantation of hepatocytes/progenitor cells remodels or repopulates livers resulting in improved hepatic function, which represents a promising treatment option for liver diseases, but poor engraftment of transplanted liver cells in livers has been the major obstacle for exerting therapeutic efficacy on liver diseases. We herein demonstrated great potential of multisite injection of bioengineered hepatic units generating from collagen hydrogel and neonatal liver cells (MSI) in promoting engraftment, survival of liver cells, and the therapeutic potential of liver diseases in livers. The MSI allowed transplantation of large number of liver cells into parenchyma in one time. Superiorly, the MSI promoted the engraftment and survival of liver cells, and generated large, dispersively distributed tissue masses whose sizes were positively correlated with the number of injection sites in livers. Consistently, the MSI improved liver cirrhosis as evidenced by the reduction of collagen matrix deposit, improved liver architecture, and hepatic function in the MSI group compared to that of the nontreated control. These data indicate that the MSI represents a novel, improved bioengineered strategy that can exert therapeutic efficacy on liver diseases.