Molecular Therapy · 22 authors, 9 centres
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The study developed a chemically defined method to differentiate human embryonic stem cells into photoreceptor progenitors using a retina-specific laminin isoform (LN523). Transplantation of these progenitors into mouse and rabbit models of retinal degeneration showed partial restoration of visual function and synaptic integration with host retina tissue.
This preclinical study developed a chemically defined, xenogen-free method to differentiate human embryonic stem cells (hESCs) into photoreceptor progenitors using the retina-specific laminin isoform LN523. The differentiation protocol yielded progenitors expressing key markers (e.g., CRX, RCVRN) by day 32. Transplantation of these day-32 progenitors into the subretinal space of rd10 mice, a model of retinal degeneration, showed short-term (2-week) protection of the host outer nuclear layer (ONL) as measured by full-field electroretinogram (ERG). At 4 weeks, transplanted cells survived, matured, and associated with host rod bipolar cells. Visual behavioral assessment (water maze) demonstrated improvement. Long-term (20-week) analysis in mice showed extensive association of engrafted cells with host bipolar cells and synapses, replacing lost ONL. Congruent evidence for synaptic connectivity was found in a rabbit model. The study's limitations include the lack of a purification step for the progenitors and the use of full-field ERG, which may not be sensitive enough to detect localized functional recovery in long-term studies. The findings suggest the LN523-based method is a viable, reproducible approach for generating photoreceptor progenitors for potential future cell therapies for retinal degeneration.
