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Selective transplantation of rods delays cone loss in a retinitis pigmentosa model
S Mohand-Said1, D Hicks, H Dreyfus
1Laboratoire de Physiopathologie Cellulaire et Moléculaire de la Rétine, EMI 9918 INSERM, Clinique Médicale A, Hôpitaux Universitaires de Strasbourg, 1 Place de l'Hôpital, 67091 Strasbourg Cédex, France.
Background:
Rod-cone retinal degenerations (retinitis pigmentosa) are typified by initial rod loss followed by secondary cone death. Rod death, predominantly caused by gene mutations expressed specifically in these cells, induces scotopic vision loss. Cone death, the overriding cause of blindness, has no current explanation. Disease progression and preliminary data suggest that cone survival depends on rods.
Objective:
To establish whether rod transplantation into mutant rodless retinas could halt cone loss.
Methods:
We transplanted pure sheets of rods isolated from normal-sighted mice into the subretinal space of recipient retinal degeneration mice lacking rods but possessing approximately 30% residual cones. Control animals were unoperated on or grafted with inner retinal cells from young normal donors, entire retinas from aged retinal degeneration mice, or gelatin. Two weeks after surgery, we quantified by an unbiased method the numbers of host retinal cones after immunolabeling with specific markers.
Results:
Only mice receiving rod-rich transplants demonstrated statistically significant greater cone numbers, with rescue of 40% of host cones normally destined to die during this period.
Conclusion:
Cone survival depends specifically on rods.
Clinical Relevance:
Such findings indicate that transplantation of rods could limit loss of cones, thus preserving useful vision in human retinitis pigmentosa. Arch Ophthalmol. 2000;118:807-811
Insights
Transplanting healthy rods into retinas lacking them rescued dying cones, suggesting rods are crucial for cone survival in retinitis pigmentosa.
Area of Science:
- Ophthalmology
- Neuroscience
- Cell Biology
Background:
- Rod-cone degenerations, like retinitis pigmentosa, involve initial rod loss, leading to secondary cone death and blindness.
- The exact cause of cone death in these conditions remains unexplained, though rod dependency is suspected.
Purpose of the Study:
- To investigate if transplanting functional rods can prevent cone loss in retinas lacking their own rods.
Main Methods:
- Pure rod sheets from normal mice were transplanted into the subretinal space of rodless retinal degeneration mice.
- Control groups received inner retinal cells, aged retinas, or gelatin.
- Cone numbers were quantified using immunolabeling two weeks post-transplantation.
Main Results:
- Mice receiving rod transplants showed significantly higher cone numbers compared to controls.
- Rod transplantation rescued approximately 40% of host cones that would have otherwise degenerated.
Conclusions:
- Cone survival is specifically dependent on the presence of rods.
- Rod transplantation offers a potential therapeutic strategy to preserve vision in retinitis pigmentosa by halting cone loss.
