Methods for production of platelets from pluripotent stem cells and compositions thereof
AssigneeAstellas Institute for Regenerative Medicine
InventorsQiang Feng, Shi-Jiang Lu, Robert P. Lanza
Life of this patent
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Abstract
Methods for production of platelets from pluripotent stem cells, such as human embryonic stem cells (hESCs) and induced pluripotent stem cells (iPSCs) are provided. These methods may be performed without forming embryoid bodies or clusters of pluripotent stem cells, and may be performed without the use of stromal inducer cells. Additionally, the yield and/or purity can be greater than has been reported for prior methods of producing platelets from pluripotent stem cells. Also provided are compositions and pharmaceutical preparations comprising platelets, preferably produced from pluripotent stem cells.
Claims21
A pharmaceutical preparation that is suitable for use in a human patient comprising at least 108 platelets, wherein the preparation is substantially free of leukocytes and wherein substantially all of the platelets are functional.
7-45. (canceled)
A method for producing a pharmaceutical preparation comprising:
- differentiating megakaryocytes positive for CD41a and CD42b expression in a feeder-free, non-adherent culture to cause formation in the culture of platelets, at least 60% of which are positive for CD41a and CD42b;
- isolating the platelets from the culture;
- and
- concentrating the platelets to form a pharmaceutical preparation comprising at least 108 platelets, wherein the preparation is substantially free of leukocytes and wherein substantially all of the platelets are functional.
A bioreactor having weakly adherent or non-adherent megakaryocytes that produce functional platelets without feeder cells.
Dependencies are inferred from the claim text.