“These cells could prove a revolutionary treatment option for numerous diseases, including heart disease and stroke and for tissue damage and neural regeneration.”
Researchers from the UCLA Department of Obstetrics and Gynecology have isolated a new population of primitive, stress-resistant human pluripotent stem cells that are easily derived from fat tissue and are able to differentiate into virtually every cell type in the human body without genetic modification.
The cells, called multi-lineage stress-enduring stem cells from adipose tissue (Muse-AT), were discovered by “scientific accident” when a piece of equipment failed in the laboratory, killing all the stem cells in an experiment except the Muse-AT cells.
The UCLA team further discovered that not only are Muse-AT cells able to survive severe stress, they may even be activated by it, said Gregorio Chazenbalk, an associate researcher with UCLA Obstetrics and Gynecology and the senior author of the research.
These pluripotent cells, isolated from fat tissue removed during liposuction, expressed many embryonic stem-cell markers and were able to differentiate into muscle, bone, fat, cardiac, neuronal and liver cells. An examination of their genetic characteristics confirmed their specialized functions, as well as their capacity to regenerate tissue when transplanted back into the body following their “awakening.”
“This population of cells lies dormant in the fat tissue until it is subjected to very harsh conditions,” Chazenbalk said. “These cells can survive in conditions in which usually only cancer cells can live.
“Upon further investigation and clinical trials,” he added, “these cells could prove a revolutionary treatment option for numerous diseases, including heart disease and stroke and for tissue damage and neural regeneration.”
The results of the two-year study are published June 5 in the peer-reviewed journal PLOS ONE.
Purifying and isolating Muse-AT cells does not require the use of a cell sorter or other specialized high-tech devices, the researchers said. The cells are able to grow either in suspension, forming cell spheres, or as adherent cells, forming cell aggregates very similar to the embryoid bodies derived from human embryonic stem cells.
“We have been able to isolate these cells using a simple and efficient method that takes about six hours from the time the fat tissue is harvested,” said Chazenbalk, who is also a scientist with the Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research at UCLA. “This research offers a new and exciting source of fat stem cells with pluripotent characteristics, as well as a new method for quickly isolating them. These cells also appear to be more primitive than the average fat stem cells, making them potentially superior sources for regenerative medicine.”
Currently, embryonic stem cells and induced pluripotent stem cells — skin cells turned into embryonic-like cells — are the two main sources of pluripotent cells. However, both types can exhibit an uncontrolled capacity for differentiation and proliferation, leading to the formation of unwanted teratomas, or tumors. Little progress has been made in resolving that defect, Chazenbalk said.
Muse cells were originally discovered by a research group at Tokohu University in Japan and were derived from bone marrow and skin, rather than fat. That research group showed that Muse cells did not produce teratomas in animal models. Further research on the Muse-AT cells isolated at UCLA will need to be done to determine whether that cell population avoids the production of teratomas.
In addition to providing a potential source of cells for regenerative medicine, Chazenbalk said the Muse-AT cells may lead to a better understanding of cancer cells, the only other cells known to display such stress resistance.
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