We humans might not be able to regrow a leg, as can a cockroach or salamander, or regenerate a missing half, like a flatworm, but our organs can replenish themselves – thanks to stem cells. Two new reports about opposite ends of the respiratory system may pave the way for replacement breathing parts.
A 36-year-old grad student from Eritrea was facing certain death from a golf-ball-sized tumor obstructing his trachea and sending tentacles towards his bronchi, the paired tubes that lead into the lungs. He was saved with a “tailored bioartificial nanocomposite” replacement trachea seeded with his own bone marrow stem cells, reported in The Lancet.
Cancer of the trachea is often inoperable and rapidly fatal because even a ventilator can’t push air into the lungs. But the combination of a glass-like tube standing in for the natural cartilage plus the patient’s own stem cells lets biology take over. Extracellular matrix spread over the tube, new capillaries sprouted, and a coat of epithelium knitted itself. The man is now well and lived to see the birth of his child, thanks to the tissue engineers at the Karolinska Institute and the University of Iceland.
The Alden March Bioethics Institute offers graduate online masters in bioethics programs. For more information on the AMBI master of bioethics online program, please visit the AMBI site.