Preconditioning the initial state of feeder-free human pluripotent stem cells promotes self-formation of three-dimensional retinal tissue

A Kuwahara, S Yamasaki, M Mandai, K Watari… - Scientific Reports, 2019 - nature.com
A Kuwahara, S Yamasaki, M Mandai, K Watari, K Matsushita, M Fujiwara, Y Hori, Y Hiramine…
Scientific Reports, 2019nature.com
A three-dimensional retinal tissue (3D-retina) is a promising graft source for retinal
transplantation therapy. We previously demonstrated that embryonic stem cells (ESCs) can
generate 3D-retina in vitro using a self-organizing stem cell culture technique known as
SFEBq. Here we show an optimized culture method for 3D-retina generation from feeder-
free human pluripotent stem cells (hPSCs). Although feeder-free hPSC-maintenance culture
was suitable for cell therapy, feeder-free hPSC-derived aggregates tended to collapse …
Abstract
A three-dimensional retinal tissue (3D-retina) is a promising graft source for retinal transplantation therapy. We previously demonstrated that embryonic stem cells (ESCs) can generate 3D-retina in vitro using a self-organizing stem cell culture technique known as SFEBq. Here we show an optimized culture method for 3D-retina generation from feeder-free human pluripotent stem cells (hPSCs). Although feeder-free hPSC-maintenance culture was suitable for cell therapy, feeder-free hPSC-derived aggregates tended to collapse during 3D-differentiation culture. We found that the initial hPSC state was a key factor and that preconditioning of the hPSC state by modulating TGF-beta and Shh signaling improved self-formation of 3D-neuroepithelium. Using the preconditioning method, several feeder-free hPSC lines robustly differentiated into 3D-retina. In addition, changing preconditioning stimuli in undifferentiated hPSCs altered the proportions of neural retina and retinal pigment epithelium, important quality factors for 3D-retina. We demonstrated that the feeder-free hiPSC-derived 3D-retina differentiated into rod and cone photoreceptors in vitro and in vivo. Thus, preconditioning is a useful culture methodology for cell therapy to direct the initial hPSC state toward self-organizing 3D-neuroepithelium.
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