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Updated: Jul 2, 2026
Subretinal Transplantation of MACS Purified Photoreceptor Precursor Cells into the Adult Mouse Retina
Published on: February 22, 2014
Direct Conversion of Mouse Fibroblasts into Photoreceptor-like Cells
Jia Xie1,2,3, Sam Enayati3, Dong Feng Chen3
1Department of Ophthalmology, Peking University First Hospital, No 1, Xi'anmen Street, Xicheng District, Beijing 100034, China.
Abstract:
The purpose of our study is to explore the potential of a transcription factor-based strategy for directly converting mouse fibroblasts into photoreceptor-like cells. The mouse cDNAs of Ascl, Crx, Ngn1, Nrl, and Otx2 were cloned into a modified commercial adenoviral vector. Mouse embryonic fibroblasts (MEFs) were isolated from E13.5 embryos, and mouse postnatal fibroblasts (MPFs) were isolated from three-day-old mice. A pool of adenoviruses containing five genes was prepared to infect MEFs or MPFs once daily for two days. The MEFs or MPFs were incubated in a specific medium supplemented with forskolin and were changed every two days. After 7 or 14 days, the photoreceptor-like cells were assayed via immunofluorescence or polymerase chain reaction with reverse transcription (RT-PCR). The photoreceptor-like cells were then transplanted into adult C57BL/6 mouse retinas and were assessed by immunofluorescence 14 days following transplantation. Screening from a pool of five candidate genes, we reported that a combination of only three factors-Crx, Nrl, and Otx2-was sufficient to convert mouse embryonic and postnatal fibroblasts into photoreceptor-like cells. The induced photoreceptor-like cells expressed photoreceptor-specific proteins such as Recoverin, Rhodopsin, and Opsin and integrated into the outer nuclear layer of the retina following transplantation. This exploratory study provides preliminary evidence that fibroblasts can be directly converted into photoreceptor-like cells, suggesting a cellular model and potential source for future transplantation strategies aimed at retinal repair.
Insights
Scientists converted mouse fibroblasts into photoreceptor-like cells using three key transcription factors. This finding offers a potential new cell source for retinal repair strategies.
Area of Science:
- Cell Biology
- Developmental Biology
- Ophthalmology
Background:
- Fibroblasts are common cells that can be found throughout the body.
- Photoreceptor cells are essential for vision and are located in the retina.
- Loss of photoreceptor cells can lead to blindness.
Purpose of the Study:
- To investigate the direct conversion of mouse fibroblasts into photoreceptor-like cells using transcription factors.
- To identify the minimal set of transcription factors required for this cell reprogramming.
Main Methods:
- Cloning of five candidate transcription factors (Ascl, Crx, Ngn1, Nrl, Otx2) into an adenoviral vector.
- Isolation and infection of mouse embryonic fibroblasts (MEFs) and mouse postnatal fibroblasts (MPFs) with the viral vectors.
- Culture of infected fibroblasts in a specialized medium and assessment of induced photoreceptor-like cells via immunofluorescence and RT-PCR.
- Transplantation of induced cells into mouse retinas and subsequent evaluation.
Main Results:
- A combination of three transcription factors (Crx, Nrl, and Otx2) was sufficient to convert both MEFs and MPFs into photoreceptor-like cells.
- The induced cells expressed key photoreceptor proteins, including Recoverin, Rhodopsin, and Opsin.
- Transplanted cells integrated into the outer nuclear layer of the host retina.
Conclusions:
- Direct conversion of fibroblasts to photoreceptor-like cells is feasible using a defined set of transcription factors.
- This method provides a potential cellular model for studying photoreceptor development and disease.
- The induced cells represent a potential source for future cell transplantation therapies for retinal degeneration.
