They used a hydrogel to mix three immature choroidal cell types.
"We know that AMD starts in the outer blood-retina barrier," said Kapil Bharti, Ph.D., who heads the NEI Section on Ocular and Stem Cell Translational Research. "However, mechanisms of AMD initiation and progression to advanced dry and wet stages remain poorly understood due to the lack of physiologically relevant human models.
"By printing cells, we're facilitating the exchange of cellular cues that are necessary for normal outer blood-retina barrier anatomy," said Bharti. "For example, the presence of RPE cells induces gene expression changes in fibroblasts that contribute to the formation of Bruch's membrane – something that was suggested many years ago but wasn't proven until our model.
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