Efficient Generation of Retinal Pigment Epithelial Cells in the Cultures of hESC

Wei Liu, PhD
Albert Einstein College of Medicine (Bronx, NY, United States)
Year Awarded:
Grant Duration:
July 1, 2012 to September 30, 2014
Macular Degeneration
Award Amount:
Grant Reference ID:
Award Type:
Award Region:
US Northeastern
Wei Liu, PhD

Efficient Differentiation of Retinal Pigment Epithelial Cells from hESC


Retinal pigment epithelial (RPE) cells are damaged in age-related macular degeneration (AMD), so Dr. Wei Liu and colleagues aim to efficiently generate RPE cells from the H1 human embryonic stem cell (hESC) cultures by adding active regulatory molecules to the cell-culture medium. This program is based on the recent findings that these active regulatory molecules promote embryonic RPE development. The team plans to develop a more efficient protocol for the generation of RPE cells for a future stem cell-based strategy in treating AMD.


Dr. Wei Liu and colleagues aim to identify the regulatory molecules that promote the generation of RPE cells by using cultures of human embryonic stem cells (hESCs) or human-induced pluripotent stem cells (hiPSCs). Liu plans to use the H1 hESC line, which is among the most extensively studied and characterized.

AMD is characterized by progressive dysfunction and degeneration of the aging RPE and photoreceptor (light-detecting) cells in the macular region, leading to impairment and loss of central, high-acuity vision. RPE cells closely interact with photoreceptors and are crucial for photoreceptor functions and survival. While anti-VEGF eye injection treatments have been developed for wet AMD, no effective treatment is available for dry AMD.

Stem cell-based strategies in treating and modeling of AMD are emerging as a new frontier in this field. The current protocols for the generation of RPE cells in hESC or hiPSC cultures are still inefficient. More efficient generation of RPE cells from either hESCs or iPSCs cultures are needed to advance the potential clinical applications of current stem cell-based research.

Liu has recently identified the key pathways that regulate embryonic RPE development; manipulating these pathways could help improve the efficiency of RPE cell production in hESC- or hiPSC-derived cultures. The novelty of this project is to determine the roles of these regulatory molecules in stimulating hESC or hiPSC to change into RPE cells, which has not been evaluated before. This project helps to bring the field closer to a potential stem cell-based strategy for treatment of AMD, in which RPE cells are impaired and degenerated.

About the Researcher

Dr. Wei Liu is a Research Assistant Professor in the Department of Ophthalmology and Visual Sciences and in the Department of Genetics in Albert Einstein College of Medicine. He earned his Ph.D. degree in the Institute of Biophysics Chinese Academy of Sciences, and he received his postdoctoral training in St. Jude Children's Research Hospital in Memphis, TN. Liu's research interests are molecular mechanisms of retinal cell differentiation and related retinal diseases, aiming at bringing the field closer to stem-cell-based regenerative medicine in treating retinal diseases.


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