After washing three times by PBS, cells were incubated with appropriate second antibodies and DAPI (Wako) for 2?h at space temperature. distinguishing practical RPE linens from those unsuitable for transplantation. To overcome these issues, we developed methods for the generation of RPE linens from hiPSC, and image-based evaluation. We found that stepwise treatment with six signaling pathway inhibitors along with nicotinamide improved RPE differentiation effectiveness (RPE6iN), enabling the RPE sheet generation at high purity without manual selection. Machine learning models were developed based on cellular morphological features of F-actin-labeled RPE images for predicting transepithelial electrical resistance ideals, an indication of RPE sheet function. Our model was effective at identifying low-quality RPE linens for elimination, even when using label-free images. The RPE6iN-based RPE sheet generation combined with the non-destructive image-based prediction gives a comprehensive fresh answer for the large-scale production of real RPE linens with lot-to-lot variations and should facilitate the further development of RPE alternative therapies. (IWR, 1?M), a Wnt/-catenin transmission inhibitor, was simultaneously added during the period from day time 0 to day time 6 to promote retinal differentiation. Cells were treated with the ROCK inhibitor Y-27632 (10?M) until day time 18 to inhibit cell death29. The induced cells were subsequently treated with the GSK3 inhibitor CHIR99021 (3?M) and the bFGF receptor inhibitor SU5402 (2?M) (Fig.?1A) because Wnt signaling activation promotes RPE differentiation9,30 and blockage of FGF signaling inhibits neural retina differentiation9,31. To determine whether the hiPSC ARN 077 differentiated into RPE lineages, we performed immunostaining for PAX6, a marker for the inner and outer layers of the optic vesicle and the optic cup32, and MITF, a marker for the outer layer of the optic vesicle ARN 077 and the optic cup33. MITF and PAX6 double-positive cells were observed on day time 12 (Fig.?1B), indicating that hiPSC differentiated into RPE progenitors less than our differentiation condition. To induce pigmented RPE, we changed the culture medium to the RPE maintenance medium from day time 24 when induced cells used a polygonal morphology having a cobblestone appearance. F-actin staining CD80 with phalloidin-Rhodamine visualized the formation of polygonal actin bundles (Fig.?1C). The polygonal cells accumulated pigmentation on day time 35 (Fig.?1D). However, some non-pigmented cells with neural process-like constructions were also observed on day time 35 (Fig.?1E). Since both neural retina progenitors and RPE progenitors are derived from common progenitors, it is possible that the contaminated non-RPE cells were neural retina progenitors9. We examined whether the contaminated non-RPE cells ARN 077 were ARN 077 neural retina progenitors by immunostaining for CHX10, a marker for neural retina progenitors34, and MITF. A small number of cells were CHX10-positive and MITF-negative on day time 35 (Fig.?1F), suggesting the non-RPE cells were neural retina progenitors that were induced along with RPE cells from hiPSC. These results indicate the stepwise treatment with the small molecules efficiently induced RPE progenitors and RPE from hiPSC, having a minority of neural retina progenitors. Open in a separate window Number 1 Small-molecule-based differentiation of RPE from hiPSC. (A) Timetable for stepwise treatment for RPE differentiation from hiPSC. Y27632 (10?M), LDN (LDN193189, 100?nM), A83 (A83-01, 500?nM), IWR (IWR-1-in RPE6iN-induced RPE cells (differentiation day time 24) and RPE linens relative to undifferentiated hiPSC was quantified using RT-qPCR. *(Wako), and 10?M Y-27632 were added to IMDM/Hams F12 (1:1, both from Sigma) supplemented with 10% KnockOut Serum Alternative (Thermo Fisher Scientific), 0.5?mM Monothioglycerol Answer (Wako), 1% Chemically Defined Lipid Concentrate (Wako), and 2?mM l-glutamine (Wako) for the initial 6?days, and then with 3?M CHIR99021 (Wako), 2?M SU5402 (Wako), and 10?M Y-27632 in IMDM/F12 for another 12?days. From day time 18, the medium was changed to DMEM/F12 (Sigma) supplemented with 10% KnockOut Serum Alternative, 1% N2 Product (Wako), and ARN 077 2?mM l-glutamine. In some experiments, 10?mM nicotinamide (Wako) was added from day time 12 to day time 24. For further maturation, hiPSC-RPE were cultured in RPE maintenance medium (67% high glucose DMEM (Wako), 29% Hams F12, 2% B27 product minus vitamin A (Thermo Fisher Scientific), 2?mM l-glutamate, 100 U/mL Penicillin and 100?g/mL Streptomycin. The tradition medium was changed with a fresh one every day. For RPE sheet generation, the hiPSC-RPE were treated with 0.25% TrypsinCEDTA (Wako).
After washing three times by PBS, cells were incubated with appropriate second antibodies and DAPI (Wako) for 2?h at space temperature