Generation of biologically responsive colon-like intestinal tissue patches from human induced pluripotent stem cells...

The intestinal mucosa is a complex functional layer which is formed from a diverse range of cell types that include epithelial cells (within crypts and villi) and an array of mesenchymal cells. Many intestinal diseases involve loss of the surface mucosa which can be difficult to restore, and which delays healing and return to normal function. We reason that development of a transplantable intestinal mucosal tissue graft may be a potential therapeutic strategy to aid healing. To be clinically useful, such a tissue graft would need to be capable of rapid production, avoid the risk of host rejection and be demonstrably safe. To create a potential intestinal graft, we developed a novel early-stage human induced pluripotent stem cell (hiPSC) co-differentiation platform capable of generating multiple intestinal cell lineages (epithelial, mesenchymal and endothelial) in 8 days. This protocol is simple to implement, serum-free and greatly reduces the use of animal products. We confirmed the identity of cells by demonstrating that these cells had RNA and protein expression profiles typical of intestinal cell lineages. In particular, we used bulk and single-cell RNA sequencing to characterise global cellular transcriptional profiles robustly and showed that the cells have intestinal identity with early polarisation towards colonic differentiation. The results were replicated across multiple hiPSC lines and in an independent centre. We further cultured the derived cells on collagen hydrogels to form colon-like intestinal patches (CL-IPs). When transplanted into mouse subcutis, CL-IPs formed into colon-like tissue structures, including crypts, stromal and muscle layers. They also developed human-origin vasculature which underwent anastomosis with the murine vasculature to transport murine blood into the graft. Teratoma assays and molecular analyses showed no evidence of residual pluripotency. While at an early stage, this platform shows great potential for further development as a potential source for novel intestinal mucosal regeneration therapy. In addition, the platform is physiologically relevant and thus shows promise as the basis for a new generation of in vitro models of intestinal pathobiology.