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Updated: May 10, 2026
07:07
Efficient Derivation of Retinal Pigment Epithelium Cells from Stem Cells
Published on: March 8, 2015
9.7K
Retinal progenitor cells (jCell) for retinitis pigmentosa
Jing Yang1,2, Baruch D Kuppermann2, David Liao3
1Stem Cell Research Center, University of California, Irvine, Irvine, CA, United States.
Frontiers in Cellular Neuroscience
|September 10, 2025
Summary
Intravitreal injection of human retinal progenitor cells (RPCs) was safe and well-tolerated in patients with retinitis pigmentosa (RP). Exploratory data suggest potential vision improvement, especially at higher doses, warranting further study.
Area of Science:
- Ophthalmology
- Regenerative Medicine
- Cell Therapy
Background:
- Retinitis pigmentosa (RP) is a group of inherited retinal diseases causing progressive vision loss.
- Current treatments for RP are limited, highlighting the need for novel therapeutic strategies.
- Human retinal progenitor cells (RPCs) offer a potential cell-based therapy for retinal degeneration.
Purpose of the Study:
- To evaluate the safety and tolerability of intravitreal RPC injections in adults with non-syndromic RP.
- To assess the potential efficacy of RPCs in improving visual acuity and other visual functions.
Main Methods:
- A prospective, multicenter, open-label, single-arm Phase I/IIa safety study involving 28 adults with RP.
- Participants were divided into two cohorts based on baseline visual acuity.
- Subjects received a single intravitreal injection of RPCs at doses ranging from 0.5 to 3.0 × 10^6 cells.
Main Results:
- Intravitreal RPC injection was generally well-tolerated, with mostly mild, transient adverse events.
- No signs of graft rejection were observed.
- Exploratory efficacy assessments indicated potential improvements in best-corrected visual acuity (BCVA) at all doses, with a possible dose-response relationship at higher RPC concentrations.
Conclusions:
- Intravitreal RPC injection is a safe and tolerable treatment for RP patients.
- The study provides preliminary evidence of potential visual function improvement in RP patients treated with RPCs.
- Further investigation in larger, controlled trials is warranted to confirm these findings and explore the therapeutic potential of RPCs in RP.
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