Vascularization and microfluidic guidance elevate human retinal organoids to a new level of functional maturity

Retinal organoids from human pluripotent stem cells have emerged as vital tools for research in human retinal development, disease, and therapy. The absence of a vascular system in these cultures along with decreased survival of retinal ganglion cells (RGCs) over extended culture periods have, in many ways, hindered their recreation of physiological processes as they are in an in vivo environment. A recent paper published in Cell Stem Cell, from the lab of Sharma et al., involving the generation of transiently vascularized retinal organoids (vROs) through the inclusion of stem cell-derived endothelial cells and microfluidic technology, presents a remarkable enhancement in the survival, functional maturation, as well as the light response mediated through photoreceptors of RGCs in comparison to non-vascularized cultures. This development removes many of the caveats prevailing in the history of retinal organoid research, aligning more accurately with the in vivo environment. In the following sections, the implications of this directive technology have been highlighted.