The study was published online ahead of print in the journal Cell Stem Cell.
Pluripotent stem cells (PSCs) are cells that can transform into almost any cell in the human body. Scientists have long cultured PSCs in the laboratory (in vitro) using many different methods and under a variety of conditions. Though it has been known that culture techniques can affect what kind of cells PSCs eventually become, no "gold standard" has yet been established to help scientists determine how the artificial environment can better replicate that found in a natural state (in vivo).
Dr. Kevin Huang, postdoctoral fellow in the lab of Dr. Fan and a lead author of the study, analyzed data from multiple existing research studies conducted over the past year. These previously published studies used different culture methods newly developed in vitro in the hopes of coaxing human stem cells into a type of pluripotency that is in a primitive or ground-zero state.
Utilizing recently-published gene expression profiles of human preimplantation embryos as the benchmark to analyze the data, Dr. Huang and colleagues found that culture conditions do affect how genes are expressed in PSCs, and that the newer generation culture methods appear to better resemble those found in the natural environment of developing embryos. This work lays the foundation on the adoption of standardized protocol amongst the scientific community.
"By making an objective assessment of these different laboratory techniques, we found that some may have more of an edge over others in better replicating a natural state," said Dr. Huang. "When you have culture conditions that more consistently match a non-artificial environment, you have the potential for a much better reflection of what is going on in actual human development."
With these findings, Dr. Fan's lab hopes to encourage further investigation into other cell characteristics and molecular markers that determine the effectiveness of culture conditions on the proliferation and self-renewal of PSCs.
"We hope this work will help the research community to reach a consensus to quality-control human pluripotent stem cells," said Dr. Fan.
The research was supported by the National Institutes of Health and UCLA Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research.
About the Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research
The stem cell center was launched in 2005 with a UCLA commitment of $20 million over five years. A $20 million gift from the Eli and Edythe Broad Foundation in 2007 resulted in the renaming of the center. With more than 200 members, the Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research is committed to a multi-disciplinary, integrated collaboration of scientific, academic and medical disciplines for the purpose of understanding adult and human embryonic stem cells. The center supports innovation, excellence and the highest ethical standards focused on stem cell research with the intent of facilitating basic scientific inquiry directed towards future clinical applications to treat disease. The center is a collaboration of the David Geffen School of Medicine, UCLA's Jonsson Comprehensive Cancer Center, the Henry Samueli School of Engineering and Applied Science and the UCLA College of Letters and Science.
To learn more about the center, visit our web site at http://www.stemcell.ucla.edu
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