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Ex vivo generation of platelet products from human iPS cells

Nakamura, Sou, Sugimoto, Naoshi, Eto, Koji·2020·Inflammation and Regeneration
DOI 10.1186/s41232-020-00139-2PMC PMC7708911
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Abstract

Platelet products are used in treatments for thrombocytopenia caused by hematopoietic diseases, chemotherapy, massive hemorrhages, extracorporeal circulation, and others. Their manufacturing depends on volunteers who donate blood. However, it is becoming increasingly necessary to reinforce this blood donation system with other blood sources due to the increase in demand and shortage of supply accompanying aging societies. In addition, blood-borne infections and alloimmune platelet transfusion refractoriness are not completely resolved. Since human induced pluripotent stem cell (iPSC)-platelet products can be supplied independently from the donor, it is expected to complement current platelet products. One big hurdle with iPSC-based systems is the production of 10 units, which is equivalent to 200 billion platelets. To overcome this issue, we established immortalized megakaryocyte cell lines (imMKCLs) by introducing three transgenes, c-MYC, BMI1, and BCL-XL, sequentially into hematopoietic and megakaryocytic progenitor stage cells derived from iPSCs. The three transgenes are regulated in a Tet-ON manner, enabling the addition and depletion of doxycycline to expand and maturate the imMKCLs, respectively. In addition, we succeeded in discovering drug combinations that enable feeder-free culture conditions in the imMKCL cultivation. Furthermore, we discovered the importance of turbulence in thrombopoiesis through live bone marrow imaging and developed a bioreactor based on the concept of turbulent flow. Eventually, through the identification of two key fluid physic parameters, turbulent energy and shear stress, we succeeded in scaling up the bioreactor to qualitatively and quantitatively achieve clinically applicable levels. Interestingly, three soluble factors released from imMKCLs in the turbulent flow condition, macrophage migration inhibitory factor (MIF), insulin growth factor binding protein 2 (IGFBP2), and nardilysin (NRDC), enhanced platelet production. Based on these developments, we initiated the first-in-human clinical trial of iPSC-derived platelets to a patient with alloimmune platelet transfusion refractoriness (allo-PTR) using an autologous product. In this review, we detail current research in this field and our study about the ex vivo production of iPSC-derived platelets.

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Fig. 1 The expansion and production stages of imMKCLs. imMKCLs are established from iPSC-derived hematopoietic progenitor cells by the lentiviral gene transfection of c-MYC, BMI1, and BCLXL. By removing doxycycline (Dox-OFF), imMKCLs can switch from self-renewal to maturation with platelet production. These cells are cryopreserved as a master cell stock, and clinical grade platelets can be produced by performing the manufacturing process after thawing according to good manufacturing practice (GMP) guidelines [15, 25]
Fig. 1 The expansion and production stages of imMKCLs. imMKCLs are established from iPSC-derived hematopoietic progenitor cells by the lentiviral gene transfection of c-MYC, BMI1, and BCLXL. By removing doxycycline (Dox-OFF), imMKCLs can switch from self-renewal to maturation with platelet production. These cells are cryopreserved as a master cell stock, and clinical grade platelets can be produced by performing the manufacturing process after thawing according to good manufacturing practice (GMP) guidelines [15, 25]CC BY · PubMed Central
Fig. 2 Turbulence promotes platelet generation to allow for the production of 100 billion platelets ex vivo. From in vivo imaging, platelet release was observed at the sites of turbulence in the blood flow. By applying turbulence ex vivo, we succeeded in obtaining 100 million functional platelets from a single imMKCL clone in an 8-L VerMES. Two physical parameters, turbulent energy and shear stress, are involved in the bioreactor scale-up, and turbulence stimulated imMKCL to releases the soluble factors IGFBP2, MIF, and NRDC, which activated the platelet production[25]
Fig. 2 Turbulence promotes platelet generation to allow for the production of 100 billion platelets ex vivo. From in vivo imaging, platelet release was observed at the sites of turbulence in the blood flow. By applying turbulence ex vivo, we succeeded in obtaining 100 million functional platelets from a single imMKCL clone in an 8-L VerMES. Two physical parameters, turbulent energy and shear stress, are involved in the bioreactor scale-up, and turbulence stimulated imMKCL to releases the soluble factors IGFBP2, MIF, and NRDC, which activated the platelet production[25]CC BY · PubMed Central

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Cited by

Metadata

Authors
Nakamura, S., Sugimoto, N., & Eto, K.
ORCID
Nakamura, Sou
Venue
Inflammation and Regeneration
Publisher
Springer Science and Business Media LLC
Published
2020-12
Volume
40
Issue
1
ISSN
1880-8190
DOI
10.1186/s41232-020-00139-2
PMC
PMC7708911
Cited by
16
References
2
Language
en
Licence

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