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Battle of the Sexes: “Brotox”
In the October 2013 issue of Dermatologic Surgery (2013;39:1434-1443), Keaney and Alster reviewed the use of botulinum toxin in men....
In an article published online in Maclean’s magazine on October 15, 2013, the concept of developing artificial body parts is discussed. The technology now exists for scientists to grow tissue organs, such as ears, noses, and fingers. Several groups of investigators, including Anthony Atala, MD (Wake Forest Institute for Regenerative Medicine, Winston-Salem, North Carolina) and Alexander Seifalian, PhD (University College London, England), are busy making ears by creating a biodegradable scaffold onto which cells—either stem cells from the patient or cells that have been harvested from the patient’s original organ—are layered and permitted to multiply. The cell-layered scaffold is then placed in a bioreactor for a couple of weeks. Once ready, the new ear is transplanted onto the patient; subsequently, the scaffold melts away.
Dr. Atala’s laboratory also is busy growing fingers. Meanwhile, Dr. Seifalian grew a nose (inside the patient’s own arm) in only 3 months after the patient lost his nose to skin cancer. He made a mold based on the patient’s original nose, created a scaffold composed of nanocomposite material, added the patient’s stem cells to the scaffold, and put the nose in a bioreactor to mature. Meanwhile, he placed a tissue expander in the patient’s arm and subsequently inserted the nose into the arm so that it could become vascularized and covered by skin. The nose was transplanted to the patient’s face; additional surgery is planned to open the nostrils, followed by seeding them with stem cells to return his sense of smell.
Marc Jeschke, MD, PhD (Ross Tilley Burn Centre, Sunnybrook Health Sciences Centre, Toronto, Ontario) is developing a bioprinter to create skin. The bioprinter dispenses different types of cells (grown from the patient’s own cells) into a hydrogel matrix in 3 dimensions. Currently, Dr. Jeschke is working with mice; however, in a few years, he anticipates treating human patients. Other investigators, such as Michael C. McAlpine (Princeton University, New Jersey), recently used a commercial 3-dimensional printer to make an ear; the “inks” included calf cells and a silver nanoparticle paste that formed a coiled antenna inside the cartilage that was capable of receiving electromagnetic signals and transmitting them to the brain.
What’s the issue?
The ability to grow tissue organs is going to revolutionize the surgical management of patients who need solid organ replacement; kidneys, lungs, pancreases, spleens, and tracheas have already been successfully grown. Indeed several investigators are making ears and noses. How long will it be before flaps and grafts to repair wound defects following extensive and deforming skin cancer surgery are replaced by ears and noses that are grown from the patient’s own tissue cells or stem cells? Although it seems like science fiction today, how soon will it be before a cutaneous 3-dimensional printer becomes a standard piece of equipment in the dermatologist and dermatologic surgeon’s office for use to create skin to cover postoperative sites that cannot be closed by directly bringing the wound edges together?
