The fast and safe technique developed at the Salk Institute circumvents problems that have hindered regenerative medicine
For the first time, scientists have turned human skin cells into transplantable white blood cells, soldiers of the immune system that fight infections and invaders. The work, done at the Salk Institute, could let researchers create therapies that introduce into the body new white blood cells capable of attacking diseased or cancerous cells or augmenting immune responses against other disorders.
The work, as detailed in the journal Stem Cells, shows that only a bit of creative manipulation is needed to turn skin cells into human white blood cells.
“The process is quick and safe in mice,” says senior author Juan Carlos Izpisua Belmonte, holder of Salk’s Roger Guillemin Chair. “It circumvents long-standing obstacles that have plagued the reprogramming of human cells for therapeutic and regenerative purposes.”
Those problems includes the long time—at least two months—and tedious laboratory work it takes to produce, characterize and differentiate induced pluripotent stem (iPS) cells, a method commonly used to grow new types of cells. Blood cells derived from iPS cells also have other obstacles: an inability to engraft into organs or bone marrow and a likelihood of developing tumors.
The new method takes just two weeks, does not produce tumors, and engrafts well.
“We tell skin cells to forget what they are and become what we tell them to be—in this case, white blood cells,” says one of the first authors and Salk researcher Ignacio Sancho-Martinez. “Only two biological molecules are needed to induce such cellular memory loss and to direct a new cell fate.”
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