Wednesday, June 15, 2011
Nerve Regrowth Achieved With Gel Scaffold
This work is the first creditable advance I have seen addressing nerve repair. No one expects a protocol that completely replaces what has been lost, but a protocol that reestablishes cellular life in place of the lesion or gap is a huge breakthrough. Simply put, a fluid can be injected that quickly gels and provides a benign growing environment for the nerve cells. This is a rather important starting point that we all believe we can make better as we progress.
This is the first real hope for those who suffer spinal cord injuries as well as an important step in also treating physical brain damage brought on by surgery or injury. Obviously a protocol of care can be designed around surgery in which the injuries are cleaned of blocking tissue and the gel put in place.
As basic as that is, the immediate promise is that the gaps will be filled by the specific cells required. Thus there is hope that simple physiotherapy can then encourage the growth of pathways that allow significant recovery of function and perhaps well beyond that.
This is fantastic news and we can now state that the probability of a resolution for paraplegia inside five years is no longer zero but perhaps fifty percent possible at this early stage.
Seeding the regrowth of nerves with tamarind
7 JUNE 2011
PhD student Andrew Rodda and colleagues in biomaterials research at
have been studying a plant-based compound derived from the seeds of the
tamarind tree, known as xyloglucan. It can be injected into an injury site as a
liquid and gels upon reaching body temperature. Monash University
Andrew was able to show in rats that the gel can cause nerve regrowth within an injured brain. His work is being presented for the first time in public through Fresh Science, a communication boot camp for early career scientists held at the
. Andrew was one of
16 winners from across Melbourne
Museum . Australia
All damage to the nerve cells of the central nervous system—the brain and spinal cord—is considered unrepairable. This leaves sufferers of many diseases and injuries with permanent disabilities—a major economic and social problem worldwide.
The lack of regrowth is due mainly to the toxic environment left behind after nerve death, Andrew says. “Nerve cells are sensitive, and will only grow in the most supportive of environments.”
“After injury, new cells cannot normally penetrate into the empty space left after mass cell death. Cells clump at the edges, forming an impenetrable barrier. This leaves the centre of the wound as a lesion, which contains chemicals that kill growing nerves.”
Andrew and his collaborators, however, found that the gel acts as a support structure through which cells can migrate and potentially reattach themselves to the nervous system. “The material provides a temporary scaffold on which new cells can grow and penetrate the lesion.”
In Andrew’s studies the gel was chemically modified to support cell growth and then implanted into a rat brain. Not only did it encourage regrowth in the injured brain, but it also suppressed the post-injury inflammation around the edge of the wound, that goes on killing nerves long after the original damage has been done. Nerves and other cell types then entered and repopulated the empty space filled by the gel.
Significantly, it was the helper-cells known as astrocytes that were the first to move into the implanted gel. These cells secrete beneficial chemicals, which may have helped create an environment in which the delicate nerve cells can survive.
Andrew’s study is part of a worldwide effort to encourage nerve regeneration in the brain and spinal cord. It builds on previous work at Monash to understand and control nerve growth using biomaterials.
Andrew Rodda is one of 16 early-career scientists unveiling their research to the public for the first time thanks to Fresh Science, a national program sponsored by the Australian Government.
Over the course of Fresh Science he is presenting his work:
in verse at Tech on Tap, part of AMP’s Amplify Festival in
on Monday evening Sydney
over dinner with
Chief Scientist in Melbourne
to school students in
Melbourne and . Bendigo
For interviews, contact Andrew Rodda on Andrew.Rodda@Monash.edu
For Fresh Science, contact Sarah Brooker on 0413 332 489 or Niall Byrne on 0417 131 977 or firstname.lastname@example.org
For Monash contact Craig Scutt, 03 9903 4844, Craig.Scutt@Monash.edu
The structure of the solidified gel, as seen with an electron scanning microscope (photo: David Nisbet)
The scaffold-like structure of the gel seen even closer (photo: David Nisbet)
Andrew Rodda in the lab (photo: Ting-Yi Wang)