Rod photoreceptors (in green) within a "mini retina" derived from human iPS cells in the lab.

3D “mini retina” from stem cells

Scientists at Johns Hopkins University School of Medicine have cultivated functional 3-dimensional human retinal tissue in vitro from induced human pluripotent stem cells.  And in a significant technical advance over previous cultured retina studies, the resulting tissue exhibits mature cell differentiation and organization, and is able to detect light.

From the JHU press release:

(Lead investigator M. Valeria Canto-Soler) says that the newly developed system gives them the ability to generate hundreds of mini-retinas at a time directly from a person affected by a particular retinal disease such as retinitis pigmentosa. This provides a unique biological system to study the cause of retinal diseases directly in human tissue, instead of relying on animal models.

The system, she says, also opens an array of possibilities for personalized medicine such as testing drugs to treat these diseases in a patient-specific way. In the long term, the potential is also there to replace diseased or dead retinal tissue with lab-grown material to restore vision.

The study appears in last week’s issue of Nature Communications.

(To learn more about stem cells – especially about their potential in toxicity testing – see this stem cell “primer” on

stem cells toxicity testing alternatives