To induce retinal ganglion cell (RGC) differentiation from EFSC, the cells were cultured in the priming medium supplemented with a new combination of small molecule inhibitors, including 1 M IWP2, 10 M DAPT, and 200 nMPD173074for over 2 weeks. Results == Under chemically defined conditions, PSCs were massively converted into EFSCs and subsequently NCSCs. Vision field cell identity was characterized by the expression of key fate restriction factors for early vision field cells, such asPAX6, LHX2, andVSX2. The induction of ocular NCSCs was initiated by promoting WNT signaling in EFSCs. Within 2 weeks of induction, nearly all cells expressed the typical neural crest markers p75NTR and HNK-1. Vision field stem cell-derived NCSCs can be propagated and cryopreserved. Subsequently, a CEC monolayer was induced from tagtail NCSCs in the presence of small molecular inhibitors to suppress TGF- and ROCK signaling. The polygon-shaped CEC-like cells became visible after a week in culture. The NCSC-derived CECs expressed typical CEC markers, such as N-Cadherin and Na+/K+-ATPase. == Conclusions == A novel small molecule-based approach was developed to derive human CECs from PSCs via ocular lineage specification. Moreover, EFSC-derived NCSCs could serve as an immediate source cell for rapid CEC induction in vitro. Keywords: pluripotent stem cell, corneal endothelial cell, neural crest, eye field, small molecule Corneal endothelial dystrophy is a primary cause of loss of vision. Fuchs endothelial corneal dystrophy (FECD) is age-related and the most R112 R112 common corneal endothelial disorder leading to blindness. It affects 4% of the United States population over age 40 and likely millions of people worldwide. 1Currently, restorative corneal transplantation is the only option to treat this disease, but the procedure faces many challenges, such as the shortage of healthy donor material for millions of patients around the world. To address this issue, it is imperative that an alternative source of transplantation material be developed. Human corneal endothelium consists of a monolayer of orderly arranged polygonal cells that function as a barrier to separate the corneal stroma from the aqueous humor of the anterior chamber. It also serves as a nutritional gateway and regulates water content of the corneal stroma. Human corneal endothelial cells (CECs) are not proliferative and show no signs of functional regeneration in festn. 2Average cell density gradually decreases at a rate of 0. 6% per year in a healthy cornea. Cell loss is more profound in aged, injured, or inflamed corneas. If cell density drops below a critical level, corneal physiologic function fails and corneal edema ensues, which leads to bullous keratopathy R112 and loss of visual awareness. One of the major obstacles to conducting disease mechanistic studies in the human cornea and developing nonsurgical medical treatments, such as drug therapy, is the limited availability of CECs in culture due to poor mitotic activity and propagation of cells in vitro. 3Therefore, to better study the disease mechanisms of corneal endothelial dystrophies and to relieve the worldwide shortage of donor tissue, there is considerable R112 interest in the development of in vitro expandable cell sources for engineering corneal endothelium. Attempts to expand CECs from primary CECs isolated from human donor tissues in vitro have been made in the past. 46However, massive production of CECs from a small number of healthy and qualified donor tissues remains a challenge due to the limited regenerative capacity of donor cells. In addition , cells from older donors grow slower, exhibit more heterogeneity, and are more prone to senescence compared to those from younger donors. 7, 8With recent advances in human pluripotent stem cell (PSC) technology, it now is plausible to derive an unlimited supply of CECs from PSCs in culture. A few studies have been reported recently. 9, 10Here, we report the development of a highly efficient, small moleculebased method for the induction of CECs from PSCs in vitro under a defined set of culture conditions. To emulate the natural developmental process of CEC cell fate specification, we first derived vision field stem cells (EFSCs) from PSCs, then directed EFSCs toward ocular neural crest stem cell (NCSC) fate, and subsequently differentiated ocular NCSCs to CECs. Using this three-step strategy, we were able to produce a highly homogenous and expandable monolayer R112 of CECs in culture. == Methods == == Cell Culture and Differentiation == Human PSCs H9 (WA9, WiCell) and iPSC, derived Mouse monoclonal to beta Actin. beta Actin is one of six different actin isoforms that have been identified. The actin molecules found in cells of various species and tissues tend to be very similar in their immunological and physical properties. Therefore, Antibodies against beta Actin are useful as loading controls for Western Blotting. The antibody,6D1) could be used in many model organisms as loading control for Western Blotting, including arabidopsis thaliana, rice etc. from BJ human fibroblasts (provided by the stem cell core of Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA), were cultured under feeder-free and serum-free conditions in StemPro hESC SFM medium (Thermo Fisher Scientific, Carlsbad, CA, USA) on plates coated with growth factorreduced Matrigel (BD Biosciences, San Jose, CA, USA). After the undifferentiated PSCs reached approximately 80% confluence in culture, the medium was switched to serum-free N2B27 priming medium (Dulbecco’s modified Eagle’s medium [DMEM]/F12, N2, B27, 0. 2% BSA, 2 mM L-GlutaMAX, 0. 1 mM MEM nonessential amino acids, and 0. 1 mM -mercaptoethanol) supplemented with 20 ng/ml BFGF for 1 to 2 days. The nearly confluent monolayer culture of human (h) PSCs was further cultured in N2B27 priming medium supplemented with.