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Generation of clinical-grade red blood cells from human umbilical cord blood mononuclear cells

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Abstract

A xeno-free method for ex vivo generation of red blood cells (RBCs) is attempted in order to replicate for large-scale production and clinical applications. An efficient milieu was formulated using injectable drugs substituting the animal-derived components in the culture medium. Unfractionated mononuclear cells isolated from human umbilical cord blood were used hypothesizing that the heterogeneous cell population could effectively contribute to erythroid cell generation. The strategy adopted includes a combination of erythropoietin and other injectable drugs under low oxygen levels, which resulted in an increase in the number of mature RBCs produced in vitro. The novelty in this study is the addition of supplements to the medium in a stage-specific manner for the differentiation of unfractionated umbilical cord blood mononuclear cells (MNCs) into erythropoietic lineage. The erythropoietic lineage was well established by day 21, wherein the mean cell count of RBCs was found to be 21.36 ± 0.9 × 108 and further confirmed by an upregulated expression of CD235a+ specific to RBCs. The rationale was to have a simple method to produce erythroid cells from umbilical cord blood isolates in vitro by mitigating the effects of multiple erythroid-activating agents and batch to batch variability.

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Abbreviations

EPO:

Erythropoietin

UCB:

Umbilical cord blood

MNCs:

Mononuclear cells

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Acknowledgments

The authors would like to acknowledge Dr.Asra, Dr. Chandra and Mr. Fida Hussain for their kind help.

Funding

A part of this work is funded by the Department of Biotechnology (DBT), Govt. of India (Ref. No. BT/PR 5729/PID/6/675/2012).

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Correspondence to Purna Sai Korrapati.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Conflict of interest

The authors declare that they have no conflict of interest.

Electronic supplementary material

Supplementary Fig 1

Cell recovery and purity was determined on samples obtained from the UCB before (pre) and after volume reduction (post) using differential cell counts coupled with flow cytometric analysis of specimens stained with 7-amino-actinomycin D (7AAD) and CD45+ cells. Top panel: FACS plots of unfractionated cord blood (a, b and c). A gate was placed around the population of interest (a) and the events selected were then sent to a 7-AAD /SSC plot to discriminate the live and dead cells (b). The selected even were then sent to a CD45 + /SSC plot, where viable CD45 + cells were counted (c). Bottom panel: FACS plots of MNCs obtained after density gradient centrifugation. The same gating strategy was applied for viable CD45+ cell counting in MNCs fraction (d, e and f). (JPG 436 kb)

Supplementary Fig 2

Flow cytometry results using anti– HbF antibody. The high HbF content of cultured RBCs (~80%) with bright fluorescence, corresponding to HbF, allowed discrimination between day 21 ex vivo generated RBCs (a) and essentially HbF negative adult peripheral blood RBCs (b) . (JPG 41 kb)

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Rallapalli, S., Guhathakurta, S., Narayan, S. et al. Generation of clinical-grade red blood cells from human umbilical cord blood mononuclear cells. Cell Tissue Res 375, 437–449 (2019). https://doi.org/10.1007/s00441-018-2919-6

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  • DOI: https://doi.org/10.1007/s00441-018-2919-6

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