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A significant breakthrough in stem cell biology has been made by Kumamoto University researchers who have successfully replicated the in vitro generation of hematopoietic stem cells (HSCs). This culture method not only helps us better understand how HSCs develop, but it also helps create a new tool that may one day be used to treat blood diseases and stem cell therapy.
The body employs hematopoietic stem cells (HSCs) as its main source of blood cells at different stages of development. The Institute of Molecular Embryology and Genetics’ Professor Minetaro Ogawa and Assistant Professor Saori Morino-Koga headed the research team that found that particular signaling molecules are required at each stage of differentiation.
Hemogenic (blood-producing) endothelium cells obtained from mouse embryos, which are HSC progenitors, have been successfully differentiated into transplantable HSCs using the culture method used in their study. This system replicates the microenvironment where HSC formation occurs.
Because it eliminates the need for serum or genetically modified feeder cells, which previously restricted the scalability and repeatability of HSC formation, this culture technique is exceptionally easy to use and adaptable.
Using commercially available endothelial cell lines as feeder cells, the researchers added thrombopoietin (TPO) and stem cell factor (SCF) as the only signaling molecules. The successful production of HSCs from hemogenic endothelium cells obtained from embryos was the outcome, indicating the efficacy and potential for further applications of the technique.
The scientists believe that this culture method will be an effective tool for future research on the molecular processes underlying HSC formation. They also expect that it will eventually result in the induction of HSCs from pluripotent stem cells, such as induced pluripotent stem (iPS) and embryonic stem (ES) cells, opening up new possibilities for stem cell-based treatments for blood disorders.
Sources:
Saori Morino-Koga et al. (2024). Transition of signal requirement in hematopoietic stem cell development from hemogenic endothelial cells, Proceedings of the National Academy of Sciences. DOI: 10.1073/pnas.2404193121
https://phys.org/news/2024-10-team-successful-reproduction-hematopoietic-stem.html
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