Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Noninvasive MR imaging of blood vessel growth in tumors using nanosized contrast agents

26.07.2010
Formation of new blood vessels, also known as angiogenesis, is crucial for sustained tumor growth and cancer metastasis.

Recently, clinically available therapies to suppress the growth of these vessels have been available to improve patient survival in some cancer types. Accurate detection and quantification of blood vessel growth using nonsurgical methods would greatly complement current therapies and allow physicians to quickly assess treatment regimens and adjust them as necessary.

In the work published in the August issue of Experimental Biology and Medicine, Kessinger and coworkers have incorporated nanotechnology, material science, and the clinical imaging modality MRI, to create a nanosized probe capable of noninvasively visualizing and quantifying the blood vessel growth in tumors in a preclinical model. The work was carried out by Chase Kessinger, as part of his PhD thesis in cancer molecular imaging, working together with Jinming Gao and other colleagues, at the University of Texas Southwestern Medical Center at Dallas.

Dr. Gao stated "Imaging tumor angiogenesis is important in early detection, tumor stratification and post-therapy assessment of antiangiogenic drugs. Current clinical modality for angiogenesis imaging utilizes dynamic contrast enhancement MRI by small molecular contrast agents. The method is based on the measurement of permeability of the contrast probes in well-established solid tumors and is not very specific to detect the early on-set of vessel formation. The dual functional nanoprobes aim to image angiogenesis-specific tumor markers that are overly expressed in the tumor vasculature during the early phase of angiogenesis."

Together, the research team relied on nanotechnology and established super paramagnetic micellar nanoprobes (50-70 nm in diameter) with greatly improved MRI sensitivity over conventional small molecular agents. The nanoprobe surface was functionalized with integrins that are a cyclic peptide that can specifically bind to overexpressed on the tumor endothelial cells. The nanoprobes also had a fluorescent moiety used for the validation of targeted delivery to the tumor endothelial cells. Studies in cancer cells validated the increased uptake of nanoprobes compared to non-targeted-nanoparticles. In collaboration with Dr. Masaya Takahashi and coworkers in the Advanced Imaging Research Center at UT Southwestern Medical Center, the research team employed a 3D high resolution acquisition method to visualize the accumulation of the micelle nanoprobes in tumors.

Dr. Gao said "Conventional image analysis of angiogenesis relies on the evaluation of 'hot spot' densities in 2D images. The 3D high resolution method allowed for the connection of the isolated 'hot spots' in 2D slices into 3D network structures, which greatly improves the accuracy of vessel identification and quantification."

In preclinical animal tumor models, MR imaging of the targeted contrast probes yielded vascularized network structures in 3D tumor images. The enhanced visualization allowed for a more accurate quantification of tumor angiogenesis. The results showed significant increase of contrast specificity of angiogenic vessels by the targeted nanoprobes over non-targeted micelles. These targeted nanoprobes may provide a useful contrast probe design for the clinical diagnosis of tumor angiogenesis.

Steven R. Goodman, Editor-in-Chief of Experimental Biology and Medicine, said "Kessinger et al working at the interface of nanotechnology, material science, and the clinical imaging modality MRI have created a nanosized probe capable of noninvasively visualizing and quantifying the blood vessel growth in tumors in a preclinical model. This should be an important tool for clinical observation of tumor angiogenesis".

Experimental Biology and Medicine is a journal dedicated to the publication of multidisciplinary and interdisciplinary research in the biomedical sciences. The journal was first established in 1903.

Experimental Biology and Medicine is the journal of the Society of Experimental Biology and Medicine. To learn about the benefits of society membership visit www.sebm.org. If you are interested in publishing in the journal please visit www.ebmonline.org.

Dr. Jinming Gao | EurekAlert!
Further information:
http://www.utsouthwestern.edu

More articles from Life Sciences:

nachricht Navigational view of the brain thanks to powerful X-rays
18.10.2017 | Georgia Institute of Technology

nachricht Separating methane and CO2 will become more efficient
18.10.2017 | KU Leuven

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Osaka university researchers make the slipperiest surfaces adhesive

18.10.2017 | Materials Sciences

Space radiation won't stop NASA's human exploration

18.10.2017 | Physics and Astronomy

Los Alamos researchers and supercomputers help interpret the latest LIGO findings

18.10.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>