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Adult stem cell breakthrough
Date:11/19/2008

even-centimetre tracheal segment was donated by a 51-year-old transplant donor who had who had died of cerebral haemorrhage. Spain has a policy of assumed consent for organ donation. Using a new technique developed in Padua University, the trachea was decellularised over a six-week period so that no donor cells remained.

Stem cells were obtained from the recipient's own bone marrow, grown into a large population in Professor Martin Birchall's lab at the University of Bristol, and matured into cartilage cells (chondrocytes) using an adapted method originally devised for treating osteoarthritis by Professor Anthony Hollander at the University of Bristol.

The donor trachea was then seeded with chondrocytes on the outside, using a novel bioreactor which incubates cells, developed at the Politecnico di Milano, Italy, allowing them to migrate into the tissue under conditions ideal for each individual cell type. In order to replicate the lining of the trachea, epithelial cells were seeded onto the inside of the trachea using the same bioreactor.

Four days after seeding, the graft was used to replace the patient's left main bronchus. The operation was performed in June 2008 at the Hospital Clinic, Barcelona, by Professor Paolo Macchiarini of the University of Barcelona.

Professor Macchiarini, lead author on the paper, said: "We are terribly excited by these results. Just four days after transplantation the graft was almost indistinguishable from adjacent normal bronchi. After one month, a biopsy elicited local bleeding, indicating that the blood vessels had already grown back successfully".

Martin Birchall, Professor of Surgery at the University of Bristol, added: "Surgeons can now start to see and understand the very real potential for adult stem cells and tissue engineering to radically improve their ability to treat patients with serious diseases. We believe this success has proved that we are on the verge of a new age in su
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Contact: Cherry Lewis
cherry.lewis@bristol.ac.uk
44-077-294-21885
University of Bristol
Source:Eurekalert

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