NUS scientists have developed a groundbreaking treatment for dry eye disease, a condition affecting over 1.5 billion people worldwide. This innovative approach involves transplanting a nanosized extract of plant thylakoid grana, the molecular engine behind photosynthesis, into the eye's corneal cells. When exposed to ambient light, this extract produces a key protective molecule, offering a simple, effective, and non-invasive solution to dry eye disease.
The research, led by Associate Professor David Leong Tai Wei, demonstrates that plant photosynthetic machinery can be transplanted into mammalian tissue to generate biologically useful molecules. This is a significant advancement, as it harnesses the power of light to restore the molecule depleted by dry eye disease, offering a potential cure for this debilitating condition.
The technology, named LEAF (Light-reaction Enriched thylAkoid NADPH-Foundry), is a nanosized package that acts as a dedicated NADPH factory. It produces about 20% more NADPH compared to unpackaged thylakoids, which is crucial for neutralizing reactive oxygen species (ROS) and reversing corneal damage. In preclinical studies, LEAF administered as eye drops under ambient indoor lighting reversed corneal damage to near-healthy levels within five days, outperforming existing treatments.
The study's findings are particularly fascinating, as they suggest that mammals could have limited photosynthetic abilities, similar to the sacoglossan sea slug. This evolutionary connection raises intriguing questions about the potential for animals to harness light for their benefit. The research team's core innovation was to strip away the part of the chloroplasts that consumes NADPH while keeping the thylakoids intact, resulting in a nanosized package that acts as a dedicated NADPH factory.
The implications of this research are far-reaching. As oxidative stress underpins a wide range of inflammatory conditions, the team sees potential for LEAF-based approaches in various tissues naturally accessible to visible light. They are also developing new strategies to produce therapeutically useful photosynthesised molecules in internal organs without the need for visible light penetration.
In conclusion, this groundbreaking research from NUS scientists offers a promising solution to dry eye disease, and it opens up exciting possibilities for future treatments and applications in various fields of medicine and biology.
