Scientists Give Mouse Eyes Plant Power to Fight Disease

Scientists in Singapore just pulled off something straight out of science fiction: they gave mouse eyes the ability to photosynthesize like plants.

Researchers at the National University of Singapore bought regular spinach from their local grocery store, extracted the photosynthetic machinery, and successfully transplanted it into living mouse eyes. The plant parts worked inside mammal cells for several hours, transforming light into energy-carrying molecules.

The team took inspiration from an unlikely source: sea slugs that steal photosynthesis superpowers from the algae they eat. Lead researcher Kuoran Xing wondered if mammals might pull off the same trick with a little help.

After testing spinach, water spinach, red spinach, and lettuce, regular spinach won. The team blended and filtered the leaves to isolate chloroplasts, the tiny engines that power photosynthesis in plants. They focused on structures called thylakoid grana, which look like stacks of pancakes and do the heavy lifting of converting light into chemical energy.

The scientists packaged these plant parts into tiny nanoparticles they nicknamed LEAFs. When they introduced LEAFs to mammal cells in the lab, the cells absorbed them quickly. Once inside, the plant machinery started working, producing ATP and NADPH, the same energy molecules our cells naturally use.

The transplanted chloroplasts performed what researcher David Tai Leong calls "a limited form of photosynthesis." They complete the first phase, creating energy molecules from light. They skip the second phase that plants use to make carbohydrates, but that's exactly what makes them useful for medicine.

The real breakthrough came when researchers tested LEAFs in mouse eyes. The photosynthetic parts helped calm inflammation, suggesting potential treatments for eye diseases and other inflammatory conditions. By shining light on treated areas, doctors might one day boost cellular energy right where it's needed.

The Ripple Effect

Harvard cell biologist Corey Allard calls the work "really cool," even if it looks like a party trick at first. He points out that every major scientific technique started somewhere, and researchers need to test limitations before expanding applications.

The team is already thinking bigger than eyes. If plant machinery can work in one type of mammal cell, it might work in others. Future treatments could deliver targeted energy boosts to damaged tissues, using nothing more than light.

This cross-kingdom swap represents millions of years of plant evolution now serving medicine. What started with a trip to the supermarket might someday help doctors treat diseases in entirely new ways.