An unusual discovery by Chinese researchers could open up a new path for treating challenging neurological diseases such as Alzheimer’s. A team from Shenyang Pharmaceutical University has developed ocular drops based on nanoparticles derived from pig sperm, capable of crossing extremely difficult biological barriers.
According to a study published in the journal Science Advances and cited by South China Morning Post, this technology could allow drugs to reach the brain, surpassing the blood-brain barrier – one of the biggest obstacles in the treatment of neurodegenerative diseases.
From rare ocular cancer to brain treatments
Initially, the research did not target Alzheimer's, but retinoblastoma - a rare ocular cancer in children, difficult to treat due to its sensitive location, close to the brain.
Professor Zhang Yu and his team sought a method for drugs to more efficiently reach the affected tissues. The solution came from an unexpected direction: exosomes from pig sperm, natural nanoparticles capable of transporting substances through biological barriers.
The results show that these particles can safely and efficiently deliver drugs, even to hard-to-reach areas.
How the "invisible" mechanism works
Exosomes play an essential role in reproduction. They cloak sperm with a kind of "invisible camouflage," protecting them from the female immune system and facilitating passage through cellular barriers.
Researchers have adapted this natural mechanism to create ocular drops capable of penetrating deep into retinal tissue and potentially further into the brain.
Pigs were chosen because their tissue structure is similar to humans, and the biological material is easy to obtain.
Promising results in the laboratory
In cell tests, the treatment proved safe for healthy tissues. Corneal, retinal, and crystalline cells had survival rates of over 85%, even at high concentrations.
At the same time, the effect on cancer cells was significant: an inhibition rate of 82.7%, much higher than that obtained with the drug administered alone or through conventional methods.
Possible solution for Alzheimer's and other neurological diseases
Experts say the true potential of this technology goes beyond ophthalmology.
Zhao Chunxia, a researcher at the University of Adelaide, explained, according to Nature News, that "the technique could improve drug delivery through other equally challenging barriers, such as the blood-brain barrier, for treating conditions, including Alzheimer's disease."
If these results are confirmed in clinical studies, the method could become a platform for administering treatments in multiple neurological diseases.
China increasingly experiments with unconventional solutions
This is not the first time Chinese researchers have used pigs in innovative medical experiments.
In 2025, an experimental treatment "disguised" tumors as pig tissue to trigger an immune response. Additionally, in the period 2024-2025, the first liver and lung transplants from pigs to humans were performed, using genetically modified animals to reduce the risk of rejection.
This new research aligns with this direction, exploring unusual biological solutions for major medical issues.
Although the results are promising, the technology is still in the experimental stage. The next step will be testing on animal models and, subsequently, in clinical studies on humans.