Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Soft core, hard shell – the latest in nanotechnology

22.06.2015

Medical science is placing high hopes on nanoparticles as in future they could be used, for example, as a vehicle for targeted drug delivery. In collaboration with an international team of researchers, scientists at the Helmholtz Zentrum München and the University of Marburg have for the first time succeeded in assaying the stability of these particles and their distribution within the body. Their results, which have been published in the journal Nature Nanotechnology, show that a lot of research is still needed in this field.

Nanoparticles are the smallest particles capable of reaching virtually all parts of the body. Researchers use various approaches to test ways in which nanoparticles could be used in medicine – for instance, to deliver substances to a specific site in the body such as a tumor.

For this purpose, nanoparticles are generally coated with organic materials because their surface quality plays a key role in determining further targets in the body. If they have a water-repellent shell, nanoparticles are quickly identified by the body’s immune system and eliminated.

How gold particles wander through the body

The team of scientists headed by Dr. Wolfgang Kreyling, who is now an external scientific advisor at the Institute of Epidemiology II within the Helmholtz Zentrum München, and Prof. Wolfgang Parak from the University of Marburg, succeeded for the first time in tracking the chronological sequence of such particles in an animal model.

To this end, they generated tiny 5 nm gold nanoparticles radioactively labeled with a gold isotope*. These were also covered with a polymer shell and tagged with a different radioactive isotope. According to the researchers, this was, technically speaking, a very demanding nanotechnological step.

After the subsequent intravenous injection of the particles, however, the team observed how the specially applied polymer shell disintegrated. “Surprisingly, the particulate gold accumulated mainly in the liver,” Dr. Kreyling recalls. “In contrast, the shell molecules reacted in a significantly different manner, distributing themselves throughout the body.”

Further analyses conducted by the scientists explained the reason for this: so-called proteolytic enzymes** in certain liver cells appear to separate the particles from their shell. According to the researchers, this effect was hitherto unknown in vivo, since up to now the particle-conjugate had only been tested in cell cultures, where this effect had not been examined sufficiently thoroughly.

“Our results show that even nanoparticle-conjugates*** that appear highly stable can change their properties when deployed in the human body,” Dr. Kreyling notes, evaluating the results. “The study will thus have an influence on future medical applications as well as on the risk evaluation of nanoparticles in consumer products and in science and technology.”

Further information

Background
* Isotopes are types of atoms which have different mass numbers but which represent the same element.
** Proteolytic enzymes split protein structures and are used, for example, to nourish or detoxify the body.
*** Conjugates are several types of molecules that are bound in one particle.

Original Publication
Kreyling, W. et al. (2015). In vivo integrity of polymer-coated gold nanoparticles, Nature Nanotechnology
DOI: 10.1038/nnano.2015.111

As German Research Center for Environmental Health, Helmholtz Zentrum München pursues the goal of developing personalized medical approaches for the prevention and therapy of major common diseases such as diabetes mellitus and lung diseases. To achieve this, it investigates the interaction of genetics, environmental factors and lifestyle. The Helmholtz Zentrum München has about 2,300 staff members and is headquartered in Neuherberg in the north of Munich. Helmholtz Zentrum München is a member of the Helmholtz Association, a community of 18 scientific-technical and medical-biological research centers with a total of about 37,000 staff members.

The Institute of Epidemiology II (EPI II) focuses on the assessment of environmental and lifestyle risk factors which jointly affect major chronic diseases such as diabetes, heart disease and mental health. Research builds on the unique resources of the KORA cohort, the KORA myocardial infarction registry, and the KORA aerosol measurement station. Aging-related phenotypes have been added to the KORA research portfolio within the frame of the Research Consortium KORA-Age. The institute’s contributions are specifically relevant for the population as modifiable personal risk factors are being researched that could be influenced by the individual or by improving legislation for the protection of public health.

Contact for the media:
Department of Communication, Helmholtz Zentrum München – German Research Center for Environmental Health (GmbH), Ingolstädter Landstr. 1, 85764 Neuherberg - Phone: +49-(0)89-3187-2238 - Fax: +49 89-3187-3324 - Email: presse@helmholtz-muenchen.de

Scientific contact at Helmholtz Zentrum München:
Dr. Wolfgang G. Kreyling, Helmholtz Zentrum München - German Research Center for Environmental Health (GmbH), External Scientific Advisor of the Institute of Epidemiology II, Ingolstädter Landstr. 1, 85764 Neuherberg – Email: kreyling@helmholtz-muenchen.de

Weitere Informationen:

http://www.helmholtz-muenchen.de/en/index.html - Website Helmholtz Zentrum München
http://www.helmholtz-muenchen.de/epi2 - Website Institute of Epidemiology II
http://www.helmholtz-muenchen.de/aktuelles/pressemitteilungen/2015/index.html - Press Releases of the Helmholtz Zentrum München

Helmholtz Kommunikation | Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt

More articles from Life Sciences:

nachricht Bare bones: Making bones transparent
27.04.2017 | California Institute of Technology

nachricht Link Discovered between Immune System, Brain Structure and Memory
26.04.2017 | Universität Basel

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

Bare bones: Making bones transparent

27.04.2017 | Life Sciences

Study offers new theoretical approach to describing non-equilibrium phase transitions

27.04.2017 | Physics and Astronomy

From volcano's slope, NASA instrument looks sky high and to the future

27.04.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>