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Müller cell survival and proliferation in response to medium conditioned by the retinal pigment epithelium
1Department of Anatomy and Cell Biology, University of North Texas Health Science Center, Fort Worth 76107, USA.
Abstract:
Müller cells have been implicated in the pathogenesis of proliferative vitreoretinopathy and subretinal scar formation; however, the source(s) and signal(s) responsible for their activation are unknown. This study was undertaken to determine if the retinal pigment epithelium (RPE) could be involved in this signaling process by studying its effects on Müller cell survival and division in vitro. A pure population of Müller cells isolated from 1-2 day Long-Evans rats was seeded at low density and treated with medium conditioned by neonatal rat RPE (RPE-CM) or a nonconditioned, defined medium. By day 3, Müller cells cultured in RPE-CM increased in number 2-fold. These cells survived up to 21 days, which was the longest time tested. In contrast, cell number decreased in control wells 75% by day 3, and 100% by day 4. The RPE-mediated survival and proliferation of the Müller cells occurred in a dose-dependent manner. The mitogenic response was specific for the RPE when compared with fibroblasts and non-retinal epithelial cells. Heat and trypsin treatment of the RPE-CM completely abolished its survival and mitogenic activity. These findings demonstrate the establishment of an in vitro model which can be used to investigate RPE-Müller cell interactions. This study also provides evidence for RPE involvement in Müller cell interactions. This study also provides evidence for RPE involvement in Müller cell survival and proliferation.
Insights
The retinal pigment epithelium (RPE) promotes Müller cell survival and proliferation, suggesting RPE involvement in proliferative vitreoretinopathy and scar formation. This study establishes a model for RPE-Müller cell interactions.
Area of Science:
- Ophthalmology
- Cell Biology
- Retinal Research
Background:
- Müller cells are implicated in proliferative vitreoretinopathy and subretinal scar formation.
- The signals activating Müller cells in these conditions remain largely unknown.
Purpose of the Study:
- To investigate the potential role of the retinal pigment epithelium (RPE) in Müller cell survival and proliferation.
- To establish an in vitro model for studying RPE-Müller cell interactions.
Main Methods:
- Isolated Müller cells from neonatal rats were cultured in medium conditioned by RPE (RPE-CM) or control medium.
- Cell survival and proliferation were assessed over 21 days.
- RPE-CM was subjected to heat and trypsin treatment to assess the nature of active factors.
Main Results:
- Müller cells cultured in RPE-CM showed a 2-fold increase in number by day 3 and survived up to 21 days.
- Control Müller cells exhibited significant cell death.
- The RPE-mediated survival and proliferation were dose-dependent and specific to RPE, with activity abolished by heat and trypsin treatment.
Conclusions:
- The retinal pigment epithelium actively promotes Müller cell survival and proliferation in vitro.
- These findings provide evidence for RPE involvement in Müller cell activation and suggest a role in retinal disease pathogenesis.
- An in vitro model for RPE-Müller cell interactions has been successfully established.