Retinal organoid differentiation methods determine organoid cellular composition
Patricia Berber , Andrea Milenkovic , Lisa Michaelis , Bernhard H. F. Weber
Journal of Translational Genetics and Genomics ›› 2021, Vol. 5 ›› Issue (3) : 292 -303.
Aim: We aimed to compare the quantity and quality of aging retinal organoids generated by applying three distinct differentiation protocols for human-derived induced pluripotent stem cells (hiPSC).
Methods: hiPSC were differentiated to retinal organoids using a 3D technique (Method 1) and a 3D-2D-3D technique (Method 2), the latter modified by the addition of BMP4 (Method 3). To investigate the retinal organoid quantity, we counted the number of retinal domains, precursors to organoids during differentiation. The retinal organoid quality was evaluated by immunostaining for markers of different retinal cell types in whole cryosections after days 85, 120, and 200 in culture.
Results: Method 3 produced strikingly more retinal domains per differentiation (65 ± 27) than Methods 1 (12.3 ± 11.2) and 2 (6.3 ± 6.7). Furthermore, retinal organoids differentiated with Method 3 contained significantly more CRX-positive photoreceptors and BRN3A-positive ganglion cells after 85 days in culture, compared to Methods 1 and 2. After 200 days in culture, the retinal organoids differentiated with Method 3 showed proper maturation, as demonstrated by the expression of mature rod and cone photoreceptor markers.
Conclusion: This study demonstrates that the retinal organoid differentiation method can significantly impact the cellular composition of retinal organoids at various time points of development.
Retina / retinal organoid / BMP4 / photoreceptor
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