June 08, 2011

Seeding the regrowth of nerves with tamarind

Andrew Rodda developed injectable material to regrow nerves

Melbourne scientists have developed an injectable material that encourages nerves in the brain and spinal cord to regrow. Their work could lead to new ways of treating nerve-based injuries or conditions such as Parkinson’s disease and Huntington’s disease.

PhD student Andrew Rodda and colleagues in biomaterials research at Monash University 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.

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 Melbourne Museum. Andrew was one of 16 winners from across Australia.


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.

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