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Chimeric feeders of mesenchymal stromal cells and stromal cells modified with constitutively active AKT expand hematopoietic stem cells.
Regenerative Medicine 2019 May 23
Aim: To examine whether AKT-modified stromal cells expand human CD34+ hematopoietic stem cells (HSCs). Methods: Coculture, in vitro functional assays, immuno-fluorescence microscopy, flow cytometry. Results: M2-10B4 stromal cells (M2) modified with AKT1 (M2-AKT) expanded primitive CD34+ 38- HSCs, but affected their functionality. A chimeric feeder layer comprising naive human bone marrow-derived mesenchymal stromal cells and M2-AKT not only overcame the negative effects of M2-AKT, but, unexpectedly, also gave a synergistic effect on the growth and functionality of the HSCs. Conditioned medium of bone marrow stromal cells worked as effectively, but cell-cell contact between HSCs and M2-AKT cells was necessary for the synergistic effect of M2-AKT and bone marrow-derived mesenchymal stromal cells or their CM. Conclusion: Chimeric feeders expand HSCs.
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