Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

PET Scanning Probes Reveal Different Cell Function Within the Immune System

19.05.2010
A commonly used probe for Positron Emission Tomography (PET) scanning and a new probe developed by researchers at UCLA reveal different functions in diverse cells of the immune system, providing a non-invasive and much clearer picture of an immune response in action.

The probes, the commonly used FDG that measures cellular glucose metabolism, and FAC, developed at UCLA and which measures the activity of a distinct biochemical pathway, work better when used in combination than either does alone.

In addition to revealing the extent and cellular composition of an immune response, the probes also may be useful in evaluating therapies that target different cellular components of the immune system, said Dr. Owen Witte, a professor of microbiology, immunology and molecular genetics, a Howard Hughes Medical Institute investigator and senior author of the study.

“We demonstrated with this study that each probe targets different cells in the immune system with a high degree of specificity,” said Witte, director of the UCLA Broad Stem Cell Research Center and a Jonsson Cancer Center researcher. “When cells are activated to do their job as an immune cell, the FDG probe is good at recognizing the subset of activated macrophages, while the FAC probe is good at recognizing the activated lymphocytes, as well as the macrophages. When tested sequentially, the combined information from the scans using the two probes gives you a better status of immune response.”

The study, with lead author Evan Nair-Gill, a student in the campus’ Medical Scientist Training Program, was conducted on mice bearing virally-induced sarcomas. The article appears today in the early online edition of the Journal of Clinical Investigation. Testing the probes in humans is the next step.

The scans provide clues to how the immune system works, for example, in response to cancer or auto-immune diseases such as rheumatoid arthritis, inflammatory bowel disease and multiple sclerosis, Witte said. They also could be used to see how therapies, such as vaccines and monoclonal antibodies meant to stimulate an immune response, are functioning within the body of a patient.

“This could give us another way to measure the efficacy of certain drugs,” Witte said. “With some drugs, you could measure a change in the immune response within a week.”

If the drugs are working, Witte said, doctors could stay the course. If they’re not working or not working well enough, the therapy could be discontinued, sparing the patient a months-long exposure to an ineffective drug.

The next step will be testing the two probes in humans with a range of diseases, including cancer and auto-immune disorders, to confirm the work.

Witte and his colleagues licensed the FAC probe to Sofie Biosciences, which is owned in part by Witte and other UCLA faculty members. Researchers created the small molecule by slightly altering the molecular structure of one of the most commonly used chemotherapy drugs, gemcitabine. They then added a radiolabel so the cells that take in the probe can be seen during PET scanning.

The probe measures the activity of a fundamental cell biochemical pathway called the DNA salvage pathway, which acts as a recycling mechanism that helps with DNA replication and repair. All cells use this biochemical pathway to different degrees. But in lymphocytes and macrophages that are proliferating during an immune response, the pathway is activated to very high levels. Because of that, the probe accumulates at high levels in those cells, Witte said.

Partial support for this work came from a tools and technology grant from the California Institute for Regenerative Medicine.

UCLA's Jonsson Comprehensive Cancer Center has more than 240 researchers and clinicians engaged in disease research, prevention, detection, control, treatment and education. One of the nation's largest comprehensive cancer centers, the Jonsson center is dedicated to promoting research and translating basic science into leading-edge clinical studies. In July 2009, the Jonsson Cancer Center was named among the top 12 cancer centers nationwide by U.S. News & World Report, a ranking it has held for 10 consecutive years. For more information on the Jonsson Cancer Center, visit our website at http://www.cancer.ucla.edu.

The stem cell center was launched in 2005 with a UCLA commitment of $20 million over five years. A $20 million gift from the Eli and Edythe Broad Foundation in 2007 resulted in the renaming of the center. With more than 200 members, the Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research is committed to a multi-disciplinary, integrated collaboration of scientific, academic and medical disciplines for the purpose of understanding adult and human embryonic stem cells. The center supports innovation, excellence and the highest ethical standards focused on stem cell research with the intent of facilitating basic scientific inquiry directed towards future clinical applications to treat disease. The center is a collaboration of the David Geffen School of Medicine, UCLA’s Jonsson Cancer Center, the Henry Samueli School of Engineering and Applied Science and the UCLA College of Letters and Science. To learn more about the center, visit our web site at http://www.stemcell.ucla.edu. To learn more about the center, visit our web site at http://www.stemcell.ucla.edu.

Kim Irwin | Newswise Science News
Further information:
http://www.ucla.edu
http://www.stemcell.ucla.edu

More articles from Medical Engineering:

nachricht Potentially life-saving health monitor technology designed by Sussex University physicists
10.01.2018 | University of Sussex

nachricht 2 million euros in funding for new MR-compatible electrophysiological brain implants
18.12.2017 | Max-Planck-Institut für biologische Kybernetik

All articles from Medical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

Im Focus: A thermometer for the oceans

Measurement of noble gases in Antarctic ice cores

The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

White graphene makes ceramics multifunctional

16.01.2018 | Materials Sciences

Breaking bad metals with neutrons

16.01.2018 | Materials Sciences

ISFH-CalTeC is “designated test centre” for the confirmation of solar cell world records

16.01.2018 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>