Paper Title: Identification of a retinoic acid-dependent hemogenic endothelial progenitor from human pluripotent stem cells
Journal: Nature Cell Biology
Authors:Christopher Sturgeon, PhD, Associate Professor of Cell, Developmental & Regenerative Biology and Medicine, Hematology & Medical Oncology in the Black Family Stem Cell Institute at the Icahn School of Medicine at Mount Sinai, and other coauthors.
Bottom Line:Blood-forming stem cells found in bone marrow are the life-saving component used in bone marrow transplants. However, suitable donors often cannot be found in many cases. This study reveals how the human embryo develops the precursor to blood forming stem cells, which researchers say can be used in the novel method they developed to generate blood-forming stem cells from cells in tissue culture.
The studyled by researchers from Mount Sinai and the San Raffaele Telethon Institute for Gene Therapy in Milan Italyconfirms many aspects of cell development, including origins and regulation, which are known to occur within both the mouse and human embryo. In the mammalian embryo, blood-forming stem cells emerge from a specialized cell type called hemogenic endothelium. These cells develop in response to a critical signal pathway known as retinoic acid, which is essential for growth. Their analysis found that stem cell populations derived from human pluripotent stem cells were transcriptionally similar to cells in the early human embryo.
Results: For years, researchers in the field of regenerative medicine have been able to obtain hemogenic endothelium from embryonic stem cells, but these cells do not produce blood-forming stem cells. In the embryo, blood-forming stem cell development requires signaling by retinoic acid.But, current state-of-the-art methods for deriving blood progenitors from human pluripotent stem cells do so in the absence of retinoic acid. In this latest study, researchers examined the dependence on retinoic acid in early cell types derived from human pluripotent stem cells. They performed single cell RNA sequencing of stem cells in vitro to better understand patterns of mesodermal cell types during early development. The research team identified a new strategy to obtain cells that are transcriptionally similar to those hemogenic endothelial cells found in the human embryo by stimulating a very discrete original population with retinoic acid.
Why the Research Is Interesting:This new method brings researchers and scientists closer to developing blood-forming stem cells in tissue culture, but also provides a pathway to establishing specialized blood cell types for transfusions and other treatments for cancer since the new method makings it possible to obtain the same original cells in adult blood that are found in a developing embryo.
Said Mount Sinai's Dr. Christopher Sturgeon of the research:We have made a major breakthrough in our ability to direct the development of stem cells in a tissue culture dish into cells that have the same gene expression signature as the immediate progenitor of a blood-forming stem cell found in the developing embryo. With this, now we can focus our efforts at understanding how to capture embryonic blood-forming stem cells, with the goal of using them as a substitute for bone marrow.
Researchers from the Washington University School of Medicine in St. Louis, MO contributed to this study.
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To request a full copy of the paper or to schedule an interview with the researcher, please contact the Mount Sinai Press Office at stacy.anderson@mountsinai.org or 347-346-3390.
Nature Cell Biology
28-Apr-2022
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Researchers share insights about the mechanisms of human embryo and create method to develop transcriptionally similar cells in tissue culture -...
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