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Bioengineers develop promising technique to build tracheas for implantation



The human trachea, or wind pipe, extends from the voice box to the lungs. Its tubular form provides an open airway for breathing and a moist lining that repels pathogens. Trachea damage as the result of injury or disease can sometimes require that doctors replace a section of the trachea with an implant.

A team led by Eben Alsberg, Ph.D., professor of Biomedical Engineering and Orthopaedic Surgery, and director of the Alsberg Stem Cell & Engineering Novel Therapeutics (ASCENT) Lab, Case Western Reserve University, has developed a strategy to engineer multitissue tracheas that have a cartilage structure, moist lining, and blood vessels similar to a natural trachea. In a study in the Feb. 14, 2018, issue of Advanced Science, they implanted the engineered tissue under the skin of mice, where the blood vessels showed signs of connecting with surrounding tissue.

The researchers used stem cells from bone marrow in constructing rings of cartilage that they stacked as trachea-like tubes. They successfully grew the moist layer, or epithelium, lining the structure using cells from human bronchial tubes. They also fostered blood vessel growth using pre-vasculature derived from human vein cells, so the implant developed a blood supply from surrounding tissue.

The engineered cartilage rings can be formed at various degrees of thickness for alternate functions. In addition to airway repair, the researchers suggest that the system could be applied to fabricate other tube-shaped tissues and organs.

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