May 29, 2008 - Brown University scientists have found that magnetic nanoparticles can be helpful in locating cancerous cell clusters during MRI scans, and with a thinner coating, the particles also emit a stronger signal for the MRI to detect.

Brown University chemist Shouheng Sun and a team of researchers have created the smallest magnetic nanoparticles to date that can be employed for such use. The nanoparticles seek out tumor cells and attach themselves to them. Once the nanoparticles bind themselves to these cancer cells, the particles operate like radio transmitters, greatly aiding the MRI's detection capability.

The team created peptide-coated iron oxide nanoparticles - particles billionths of a meter in size. The researchers injected the particles into mice and tested their ability to locate a brain tumor cell called U87MG. Sun and his collaborators concentrated specifically on the nanoparticle's size and the thickness of the peptide coating, which ensures the nanoparticle attaches to the tumor cell.

Size is important because the idea is to create a nanoparticle that is small enough to navigate through the bloodstream and reach the diseased area. Bigger particles tend to stack up, creating the circulatory system's version of a traffic jam. Sun's team developed a nanoparticle that is about 8.4 nanometers in overall diameter - some six times smaller than the size of particles currently used in medicine.

The coating, while integral to the nanoparticles' attachment to the tumor cell, also is crucial to establishing the "signal-to-noise" ratio that a MRI uses. The thinner the coating, the stronger the emitted signal and vice versa. Sun's team outfitted their nanoparticles with a two-nanometer thick peptide coating - 10 times thinner than the coating available in popular MRI contrast agents such as Feridex. Sun's nanoparticles are like having a 50,000-watt radio transmitter versus a 150-watt station; it's easier for the MRI to "hear" the stronger signal and to hone in on the signal's source.

Another important feature of the team's work is discovering that the RGD peptide coating binds almost seamlessly to the U87MG tumor cell. The team plans to test the particle's ability to bind with other tumor cells in further animal experiments.

The results have been published online this week in the Journal of the American Chemical Society. Brown graduates students Jin Xie, Chenjie Xu and Sheng Peng collaborated on the research, along with Professor Xiaoyuan Chen and his associates from Stanford University.

For more information: www.brown.edu


Related Content

News | Radiology Business

July 25, 2024 — Immunis, Inc., a clinical-stage biotech developing groundbreaking secretome therapeutics for age and ...

Time July 25, 2024
arrow
News | RSNA

July 23, 2024 — Professional registration is open for RSNA 2024, the world’s largest radiology forum. This year’s theme ...

Time July 23, 2024
arrow
News | Artificial Intelligence

July 23, 2024 — Researchers at the National Institutes of Health (NIH) found that an artificial intelligence (AI) model ...

Time July 23, 2024
arrow
News | Artificial Intelligence

July 17, 2024 — Hyperfine, a groundbreaking medical device company that has redefined brain imaging with the world’s ...

Time July 17, 2024
arrow
News | Prostate Cancer

July 11, 2024 — GE HealthCare’s MIM Software, a global provider of medical imaging analysis and artificial intelligence ...

Time July 11, 2024
arrow
News | Prostate Cancer

July 2, 2024 — A new editorial paper was published in Oncoscience (Volume 11) on May 20, 2024, entitled, “Deep learning ...

Time July 02, 2024
arrow
News | Clinical Trials

June 27, 2024 — Prenuvo, which makes whole-body MRI screening for early cancer detection and other diseases, has ...

Time June 27, 2024
arrow
News | Pediatric Imaging

June 25, 2024 — Rady Children’s Hospital-San Diego, one of the nation’s top pediatric health care systems, today ...

Time June 25, 2024
arrow
News | MRI Breast

June 12, 2024 — Royal Philips recently announced the 1,111th installation of its revolutionary BlueSeal 1.5T magnet ...

Time June 12, 2024
arrow
News | Radiology Business

May 29, 2024 — Strategic Radiology added a third California member to the nation’s leading coalition of independent ...

Time May 29, 2024
arrow
Subscribe Now