Scientists find genetic recipe to turn stem cells to blood

July 14, 2014
Wisconsin scientists find genetic recipe to turn stem cells to blood
Two transcription factors are all that is required to make blood from pluripotent stem cells. Following introduction of the factors, stem cells form endothelium (green) which subsequenty become blood cells (red). The process mimics the way blood is formed in the embryo. Credit: Courtesy of Irina Elcheva and Akhilesh Kumar, Wisconsin National Primate Research Center

The ability to reliably and safely make in the laboratory all of the different types of cells in human blood is one key step closer to reality.

Writing today in the journal Nature Communications, a group led by University of Wisconsin-Madison stem cell researcher Igor Slukvin reports the discovery of two genetic programs responsible for taking blank-slate stem cells and turning them into both red and the array of that make up human blood.

The research is important because it identifies how nature itself makes blood products at the earliest stages of development. The discovery gives scientists the tools to make the cells themselves, investigate how blood cells develop and produce clinically relevant blood products.

"This is the first demonstration of the production of different kinds of cells from human using transcription factors," explains Slukvin, referencing the proteins that bind to DNA and control the flow of genetic information, which ultimately determines the developmental fate of undifferentiated stem cells.

During development, blood cells emerge in the aorta, a major blood vessel in the embryo. There, blood cells, including hematopoietic stem cells, are generated by budding from a unique population of what scientists call hemogenic endothelial cells. The new report identifies two distinct groups of transcription factors that can directly convert human stem cells into the hemogenic endothelial cells, which subsequently develop into various types of blood cells.

The factors identified by Slukvin's group were capable of making the range of human blood cells, including , and megakaryocytes, commonly used blood products.

"By overexpressing just two transcription factors, we can, in the laboratory dish, reproduce the sequence of events we see in the embryo" where blood is made, says Slukvin of the Department of Pathology and Laboratory Medicine in the UW School of Medicine and Public Health and the Wisconsin National Primate Research Center.

The method developed by Slukvin's group was shown to produce blood cells in abundance. For every million stem cells, the researchers were able to produce 30 million blood cells.

A critical aspect of the work is the use of modified messenger RNA to direct stem cells toward particular developmental fates. The new approach makes it possible to induce cells without introducing any genetic artifacts. By co-opting nature's method of making cells and avoiding all potential genetic artifacts, cells for therapy can be made safer.

"You can do it without a virus, and genome integrity is not affected," Slukvin notes. Moreover, while the new work shows that blood can be made by manipulating genetic mechanisms, the approach is likely to be true as well for making other types of cells with therapeutic potential, including cells of the pancreas and heart.

An unfulfilled aspiration, says Slukvin, is to make hematopoietic stem , found in bone marrow. Hematopoietic are used to treat some cancers, including leukemia and multiple myeloma. Devising a method for producing them in the lab remains a significant challenge.

"We still don't know how to do that," Slukvin notes, "but our new approach to making will give us an opportunity to model their development in a dish and identify novel factors."

The study was conducted under the umbrella of the Progenitor Cell Biology Consortium, run by National Heart, Lung and Blood Institute, part of the National Institutes of Health, and involved a collaboration of scientists at UW-Madison, the Morgridge Institute for Research, the University of Minnesota at the Twin Cities and the Houston Methodist Research Institute.

In addition to Slukvin, authors of the new report include Irina Elcheva, Vera Brok-Volchanskaya, Akhilesh Kumar, Patricia Liu, Jeong-Hee Lee, Lilian Tong and Maxim Vodyanik, all of the Wisconsin National Primate Research Center; Scott Swanson, Ron Stewart and James A. Thomson of the Morgridge Institute for Research; Michael Kyba of the University of Minnesota's Lillehei Heart Institute; and Eduard Yakubov and John Cooke of the Center for Cardiovascular Regeneration of the Houston Methodist Research Institute.

Explore further: Opening-up the stem cell niche

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JVK
not rated yet Jul 14, 2014
The conserved molecular mechanisms of stem cell to blood cell production link the nutrient-dependent pheromone-controlled microRNA/messenger RNA balance to cell type differentiation in other cells of tissues in organisms with circulatory systems.

http://rspb.royal...abstract

Abstract excerpt: "...this result supports the hypothesis that malaria resistance drove fixation of the Duffy-null allele in mainland sub-Saharan Africa."

Nutrient-dependent pheromone-controlled ecological adaptations manifested in morphological and behavioral phenotypes exemplify fixation of alleles that stabilize the organized genome. The Duffy-null allele is an ecological adaptation, but it is placed into the context of mutation-initiated natural selection.

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