Scientists have developed a promising new treatment that could improve the fight against glioblastoma, the most aggressive and deadly type of brain cancer.
In a new study, researchers found that tiny sugar-coated particles were able to cross the brain’s natural protective barrier, deliver a cancer-fighting genetic treatment directly into tumors, and significantly extend survival in mice.
The research was led by scientists at Oregon State University and published in the Journal of Controlled Release.
Although the treatment has only been tested in animals so far, the results offer hope for developing more effective therapies for a disease that has very limited treatment options.
Glioblastoma is one of the hardest cancers to treat.
It grows quickly, spreads into nearby brain tissue, and often returns even after surgery, radiation and chemotherapy.
Fewer than 30% of patients survive for two years after diagnosis, and more than 95% die within five years. In the United States, the disease affects about 3 out of every 100,000 people each year, with most patients being diagnosed around the age of 64.
One of the biggest challenges in treating brain cancer is the blood-brain barrier. This barrier is a network of tightly packed cells that protects the brain by blocking harmful substances from entering.
While it is essential for keeping the brain healthy, it also prevents many medicines from reaching brain tumors.
To overcome this problem, the research team designed tiny fat-based particles called lipid nanoparticles. These nanoparticles carried messenger RNA (mRNA), a genetic molecule that instructs cells to produce a protein called PTEN.
PTEN acts as a natural tumor suppressor by helping control cell growth. In many glioblastoma tumors, the PTEN protein is missing or no longer works properly. By restoring PTEN production, the researchers hoped to slow or stop tumor growth.
The scientists then coated the nanoparticles with mannose, a natural sugar that is closely related to glucose, the body’s main source of energy. Cells in the blood-brain barrier contain a transporter called GLUT1, which normally carries glucose into the brain. Because GLUT1 also recognizes mannose, the sugar coating helped the nanoparticles cross the barrier and enter the brain.
The researchers also found a way to attach much more mannose to the surface of each nanoparticle, making them more likely to be accepted by the GLUT1 transporter.
Once inside the brain, the nanoparticles naturally collected in glioblastoma tumors. The cancer cells produce much higher levels of GLUT1 than normal brain cells, allowing the sugar-coated particles to target tumors more effectively.
In the mouse study, repeated treatments caused tumors to shrink and increased median survival by 50%. Importantly, the researchers did not detect harmful side effects in major organs.
While much more research is needed before this treatment can be tested in people, the findings are encouraging.
If future studies confirm the results, this sugar-coated nanoparticle technology could become a new way to deliver life-saving medicines across the blood-brain barrier and improve treatment for patients with one of the world’s most difficult cancers.
