A type of cell that scientists considered defective is actually a new kind of stem cell.
Tony Parenti, a graduate student at Michigan State University who studies cell and molecular biology, unearthed the new cells—in a cellular trash pile, of sorts. The cells are called induced XEN cells, or iXEN.
“Other scientists may have seen these cells before, but they were considered to be defective, or cancer-like,” says Parenti, who works in the lab of Amy Ralston, a biochemist, cell and molecular biologist, and coauthor of the study in Stem Cell Reports. “Rather than ignore these cells that have been mislabeled as waste byproducts, we found gold in the garbage.”
A great deal of stem cell research focuses on new ways to make and use pluripotent stem cells. Pluripotent stem cells can be created by reactivating embryonic genes to “reprogram” mature adult cells. Reprogramming mature cells into induced pluripotent stem cells, or iPS cells, allows them to become malleable building blocks that can morph into any cell in the body.
For example, if a patient has a defective liver, healthy cells could be taken from the patient, reprogrammed into iPS cells, which could then be used to help regenerate the person’s failing organ. Taking cells from the same patient may greatly reduce the chance of the body rejecting the new treatment, Parenti says.
Prior to the discovery of reprogramming, scientists developed pluripotent stem cells from embryos. However, the embryo produces not only pluripotent stem cells, but also XEN cells, a stem cell type with unique properties. While pluripotent stem cells produce cells in the body, XEN cells produce extraembryonic tissues that play an essential but indirect role in fetal development.
Parenti and his team speculate that if the embryo produces both pluripotent and XEN cells, this might also occur during reprogramming.
Popping up like weeds
The eureka moment came when Parenti discovered colonies of iXEN cells popping up like weeds in his iPS cell cultures. Using mice models, the team spent six months proving that these genetic weeds are not cancer-like, as previously suspected, but in fact, a new kind of stem cell with desirable properties.
Even more surprising, the team found that by inhibiting expression of XEN genes during reprogramming, they could decrease production of iXEN cells and increase production of iPS cells.
“Nature makes stem cells perfectly, but we are still trying to improve our stem cell production,” Parenti says. “We took what we learned by studying the embryo and applied it to reprogramming, and this opened up a new way to optimize reprogramming.”
The next steps of this research will involve seeing if this process occurs in human cells. XEN cells have yet to be discovered in humans, but the possibility of their existence is a key focus of the field.
“It’s a missing tool that we don’t have yet,” Ralston says. “It’s true that XEN cells have characteristics that pluripotent stem cells do not have. Because of those traits, iXEN cells can shed light on reproductive diseases.
“If we can continue to unlock the secrets of iXEN cells, we may be able to improve induced pluripotent stem cell quality and lay the groundwork for future research on tissues that protect and nourish the human embryo.”
The National Institutes of Health funded this research.
Source: Michigan State University