Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Cobblestones fool innate immunity

29.11.2011
Coating the surface of an implant such as a new hip or pacemaker with nanosized metallic particles reduces the risk of rejection, and researchers at the University of Gothenburg, Sweden, can now explain why: they fool the innate immune system. The results are presented in the International Journal of Nanomedicine.

“Activation of the body’s innate immune system is one of the most common reasons for an implant being rejected,” explains Professor Hans Elwing from the University of Gothenburg’s Department of Cell and Molecular Biology. “We can now show why the body more easily integrates implants with a nanostructured surface than a smooth one.”

The researchers used a unique method to produce nanostructures on gold surfaces, creating gold particles just 10-18 nm in diameter and binding them to a completely smooth gold surface at carefully regulated distances. The result is something akin to a cobbled street in miniature.

Nanosized irregularities mimic body’s natural structures

Giving implants this cobbled surface reduces the activation of important parts of the innate immune system. This is because several of the proteins involved are of a similar size to these nanosized cobbles, and so do not change in appearance when they land on the surface. This gives the body a greater ability to integrate foreign objects such as implants, pacemakers and drug capsules into its own tissues, as well as reducing the risk of local inflammation.

“It may be that the innate immune system is designed to react to smooth surfaces, because these are not found naturally in the body,” says Elwing. “Some bacteria, on the other hand, do have a completely smooth surface.”

Modern nanotechnology makes it easy and cheap to surface-treat implants and drug capsules, but it will probably be several years before this becomes a reality in human medicine. The focus now is on customising titanium implants of various kinds.

Surface can be graded

“We’ve developed a graded surface with different cobbelstone package that we think can be used for bone implants,” says Elwing. “Bone is very hard on the outside but then gets softer, so it would be good to have hard integration on the surface and softer integration underneath. We reckon we can make titanium screws that are denser at the head of the screw so that they fuse best at the top. This kind of customisation is the future.”

Research into the body’s innate immune system was rewarded this year with the Nobel Prize in Physiology or Medicine.

The laboratory work was carried out at the University of Gothenburg, and the project is a collaboration between the BIOMATCELL centre of excellence in Gothenburg, SP Technical Research Institute of Sweden in Borås and Bactiguard AB in Stockholm.

The article “Immune complement activation is attenuated by surface nanotopography” by Mats Hulander, Anders Lundgren, Mattias Berglin, Mattias Ohrlander, Jukka Lausmaa and dx.doi.org/10.2147/IJN.S24578Hans Elwing was published in the International Journal of Nanomedicine:

Contact:
Hans-Björne Elwing, Department of Cell and Molecular Biology
Tel: +46 (0)31 786 2562
Mobile: +46 (0)733 604 607
hans.elwing@cmb.gu.se

Helena Aaberg | idw
Further information:
http://www.gu.se

More articles from Health and Medicine:

nachricht Norovirus evades immune system by hiding out in rare gut cells
12.10.2017 | University of Pennsylvania School of Medicine

nachricht Flexible sensors can detect movement in GI tract
11.10.2017 | Massachusetts Institute of Technology

All articles from Health and Medicine >>>

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

Ocean atmosphere rife with microbes

17.10.2017 | Life Sciences

Neutrons observe vitamin B6-dependent enzyme activity useful for drug development

17.10.2017 | Life Sciences

NASA finds newly formed tropical storm lan over open waters

17.10.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>