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ACS Synth Biol. 2018 Jul 20;7(7):1709-1714. doi: 10.1021/acssynbio.8b00163. Epub 2018 Jun 21.

Designing Motif-Engineered Receptors To Elucidate Signaling Molecules Important for Proliferation of Hematopoietic Stem Cells.

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Department of Chemistry and Biotechnology, Graduate School of Engineering , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-8656 , Japan.
Division of Stem Cell Processing/Stem Cell Bank, Center for Stem Cell Biology and Regenerative Medicine , Institute of Medical Science, The University of Tokyo , 4-6-1, Shirokanedai , Minato-ku , Tokyo 108-8639 , Japan.
Institute for Stem Cell Biology and Regenerative Medicine , Stanford University School of Medicine , Stanford , California 94305 , United States.


The understanding of signaling events is critical for attaining long-term expansion of hematopoietic stem cells ex vivo. In this study, we aim to analyze the contribution of multiple signaling molecules in proliferation of hematopoietic stem cells. To this end, we design a bottom-up engineered receptor with multiple tyrosine motifs, which can recruit multiple signaling molecules of interest. This is followed by a top-down approach, where one of the multiple tyrosine motifs in the bottom-up engineered receptor is functionally knocked out by tyrosine-to-phenylalanine mutation. The combination of these two approaches demonstrates the importance of Shc in cooperation with STAT3 or STAT5 in the proliferation of hematopoietic stem cells. The platform developed herein may be applied for analyzing other cells and/or other cell fate regulation systems.


artificial ligand; chimeric receptor; hematopoietic stem cell; motif engineering; signal transduction

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