Vaidya A, Singh S, Limaye L, Kale V. Chimeric feeders of mesenchymal stromal cells and stromal cells modified with constitutively active AKT expand hematopoietic stem cells.
Regen Med 2019;
14:535-553. [PMID:
31115264 DOI:
10.2217/rme-2018-0157]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
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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