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From the dust -- mixing stem cells with clay to regenerate human tissue
Date:5/2/2014

nth of a millimetre, could overcome two challenges in the development of stem-cell based regenerative therapies.

The first challenge to deliver and hold stem cells at the right location in the body would be met by the ability of clay to self-organise into gels via the electrostatic interactions of the particles with each other. Cells mixed with a low concentration of clay particles gelled in water, can be injected into the body and held in the right place by the gel, eliminating, in many situations, the need for surgery.

Clay particles can also interact with large structural molecules (polymers) which are frequently used in the development of scaffolds, which stem cells grow on. These interactions can greatly improve the scaffold's strength and could be applied to preserve their stability at the site of injury until regeneration is complete.

While several gels and scaffold materials have been designed to deliver and hold stem cells at the site of regeneration, the ability of clay nanoparticles to overcome a second critical hurdle facing stem-cell therapy is what makes them especially exciting.

Dr Dawson says: "The carefully controlled provision of key biological signalling molecules is essential to directing the activity of stem-cells. However, conventional injectable gel materials are often poor at retaining these biological signals at the site of injury they can hold and deliver cells, but the molecules that stimulate the cells diffuse away when placed in the body. The ability of clay nanoparticles to bind biological molecules presents a unique opportunity to control the local environment at a site of injury or disease to stimulate and control stem-cell driven repair. This is something we are very excited about."


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Contact: Becky Attwood
r.attwood@soton.ac.uk
44-023-805-92116
University of Southampton
Source:Eurekalert  

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From the dust -- mixing stem cells with clay to regenerate human tissue
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