A dissolvable scaffold for growing new areas of skin could provide a safer, more effective way of treating burns, diabetic ulcers and similar injuries.
The ultra-fine, three-dimensional scaffold, which is made from specially developed polymers, looks similar to tissue paper but has fibres 100 times finer.
Before it is placed over a wound, the patient’s skin cells (obtained via a biopsy) are introduced and attach themselves to the scaffold, multiplying until they eventually grow over it. When placed over the wound, the scaffold dissolves harmlessly over six-to-eight weeks, leaving the patient’s skin cells behind.
The new approach to skin reconstruction has been developed by a team of chemists, materials scientists and tissue engineers at Sheffield University, with funding from the Engineering and Physical Sciences Research Council.
It is designed primarily for cases involving extensive burns where surgeons are unable to take enough skin grafts from elsewhere on the body to cover the damaged areas. Currently, bovine collagen or skin from human donors is used in these cases, but these approaches have potential health and rejection risks.
’Simplicity is the key,’ said Prof Tony Ryan, who is leading the team.
’Previous attempts to find better ways of encouraging skin cell growth have used chemical additives and other elaborate techniques to produce scaffolds, but their success has been limited.
’We’ve found that skin cells are actually very “smart” – it’s in their DNA to sort themselves into the right arrangement. They just need a comparatively uncomplicated scaffold (and each other) to help them grow in a safe, natural way.’
The polymers used in the scaffold are biodegradable materials already approved for medical applications. Because the team has recognised that skin cells are ‘smart’ and the scaffold can therefore be ‘dumb’ (i.e. not overly sophisticated), simple polymers can be used.
The process for making the scaffolds is based on a well-known technique called electrospinning. However, the team has made a key advance by developing a new method of making, from the same biodegradable polymers, aligned-fibre ‘mats’ that could be used to promote nerve or tendon growth. Their method is currently being patented.
The next step in the research is to develop the skin reconstruction technology for clinical use, hopefully in the next few years. The technology also offers possibilities for testing the toxicity of cosmetic and similar products, using materials grown in the laboratory that closely resemble natural skin.
’Ultimately, we can envisage treatment of burns victims and the undertaking of reconstructive surgery using the scaffold and the patient’s own skin to produce bespoke skin for that patient,’ said Prof Ryan.