Lab Research Suggests Magnetic Particle Imaging May Help Researchers Find More Effective Ways to Deliver Cell Therapies

Scientists at Johns Hopkins Medicine have developed a way to track cell therapy injections using a specialized form of magnetic imaging. This technique, known as magnetic particle imaging (MPI), allows researchers to visualize therapeutic cells as they are injected into the body.

Overcoming Imaging Limitations

Current cell therapies, such as CAR-T cell therapy, engineer immune cells to destroy cancer. However, conventional imaging tools like CT scanners and MRI do not allow clinicians to see exactly how many cells are delivered or where they end up.

Professor Jeff Bulte, director of cellular imaging for the Johns Hopkins Institute for Cell Engineering, notes that MPI can visualize the final destination of these therapeutic cells. This capability may eventually help researchers determine a more precise dose of therapy for individual patients.

Did You Know? The researchers compared two different cell sizes in their experiments: larger mesenchymal stem cells, measuring around 25 micrometers, and smaller neural precursor cells, measuring around 10 micrometers.

The Role of Nanoparticles

To make the cells visible, scientists tagged them with “superparamagnetic iron oxide nanoparticles.” These ultra-tiny particles allow the MPI technology to track the cells’ movement through the body.

The study utilized both normal mice and mice with experimental autoimmune encephalomyelitis (EAE), which is a common model for studying multiple sclerosis (MS). By labeling the cells, researchers could observe their delivery and accumulation in various organs.

Expert Insight: The ability to pinpoint cell accumulation in the spleen is particularly significant. Because harmful T cells in MS are thought to be released from the spleen, delivering therapy directly to that source could fundamentally change the efficiency of autoimmune treatments.

Findings on Delivery Routes

The researchers found that injecting cells into the artery was an effective delivery method. This approach resulted in more cells reaching key target organs, including the spleen and the brain.

The Institute for Cell Engineering at Johns Hopkins

In the EAE mouse models, cells accumulated in the spleen, where they could potentially subdue harmful immune cells. In normal mice, cells travelled to the brain, liver, and lungs, but were not detectable in the spleen.

Future Implications

This technology may help scientists develop more effective treatments for ALS, multiple sclerosis, and various cancers. The research suggests that MPI could be used to find the most effective delivery methods for neurologic diseases.

If implemented on a large scale, MPI cytometry may allow for the personalization of cell therapy treatments. However, scientists caution that the best delivery method could vary from one person to another.

Frequently Asked Questions

What is Magnetic Particle Imaging (MPI)?
MPI is a new imaging technique that allows scientists to visualize therapeutic cells as they are injected into the body, providing data on cell quantity and location.

Which medical conditions could this research impact?
This technology may lead to more effective treatments for certain cancers, neurological conditions such as ALS, and autoimmune diseases like multiple sclerosis (MS).

How does MPI differ from conventional MRI or CT scans?
Unlike conventional MRI and CT scanners, MPI allows clinicians to see how many therapeutic cells are actually delivered and whether they successfully target inflammatory tissues or tumors.

How do you think personalized dosing could change the future of autoimmune disease treatment?