Abstract
The shortage of human hepatocytes continues to be a significant limitation for the widespread application of hepatocyte transplantation and bioartificial liver (BAL) support therapy. Recombinant activation gene 2 (Rag2) and fumarylacetoacetate hydrolase (Fah)-deficient mice could be highly repopulated with human hepatocytes. However, Fah/Rag2-deficient mice can only produce up to 1 × 108 human hepatocytes per mouse. We hypothesized that 2-10 × 1010 human hepatocytes can be produced per Fah/Rag2-deficient pig, which is an adequate supply for hepatocyte transplantation and BAL therapy. In a novel approach, we used stably transfected Cas9 cells and single-guide RNA adenoviruses containing fluorescent reporters to enrich porcine cells with Fah/Rag2 dual gene mutations. This resulted in the construction of Fah/Rag2 double knockout porcine iliac artery endothelial cells, which were subsequently used for generating Fah/Rag2-deficient pigs.
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