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Photoreceptor Cell Death Reversible, Study Reveals
Researchers find functional mitochondria are key to recovering dying photoreceptor cells.
Published on Mar. 12, 2026
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A new study from the University of Michigan has found that photoreceptor cell death, which is associated with several vision-loss diseases, can be reversed. The researchers used mouse cell lines to stimulate apoptosis, or cell death, in photoreceptors, and then found that when the stress was removed, the cells were able to recover, aided by the process of mitophagy which removes dysfunctional mitochondria.
Why it matters
This discovery could have significant implications for treating vision-loss diseases like age-related macular degeneration, retinitis pigmentosa, and retinal detachment, which are all linked to photoreceptor cell death. If the recovery process can be better understood and harnessed, it may open up new avenues for reversing vision loss in these conditions.
The details
The researchers used chemicals or low oxygen conditions to trigger apoptosis in mouse photoreceptor cell lines. Even after the cells had progressed far into the cell death process, they were able to recover when the stress was removed. This recovery was aided by mitophagy, the process by which cells remove dysfunctional mitochondria, which play an important role in apoptosis. The team also saw similar results in mouse models where photoreceptor cell apoptosis was activated during retinal detachment and reversed upon reattachment.
- The study was published on March 12, 2026 in the journal Cell Death & Disease.
The players
David Zacks, M.D., Ph.D.
Professor of Ophthalmology and Visual Sciences and member of the Caswell Diabetes Institute at the University of Michigan.
ONL Therapeutics
A company that Zacks is an employee of and which holds patents licensed from the University of Michigan related to this research.
What they’re saying
“It's like having a corroding battery in the cell that is leaking toxins. Mitophagy gets rid of those bad batteries.”
— David Zacks, M.D., Ph.D., Professor of Ophthalmology and Visual Sciences (Mirage News)
“These results were exciting because even if we can't cure the underlying disease, we can try to activate those survival pathways and keep cells alive.”
— David Zacks, M.D., Ph.D., Professor of Ophthalmology and Visual Sciences (Mirage News)
What’s next
The researchers are working to further understand the pathways that help photoreceptor cells recover and which retinal diseases could benefit from this recovery process.
The takeaway
This study's findings challenge the traditional view that photoreceptor cell death is irreversible, opening up new possibilities for treating vision-loss diseases by activating the cells' own survival pathways and keeping them alive, even if the underlying disease cannot be cured.
