Pancreatic and Liver Endoderm Cells and Tissue by Differentiation of Definitive Endoderm Cells Obtained from Human Embryonic Stems
First Claim
1. A method of producing human pancreatic endoderm cells from definitive endoderm cells comprising:
- a. exposing human definitive endoderm cells to an effective amount of retinoic acid in a cell differential medium for a period of at least one day; and
b. stabilizing the differentiated cells obtained from step a by exposing said cells to a stabilizing medium in the absence of retinoic acid.
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Abstract
The invention relates to methods that allow for the efficient differentiation to form pancreatic endoderm cells from pluripotent stem cells such as human embryonic stem cells and definitive endoderm cells. The invention is directly applicable to the ultimate generation of pancreatic beta cells that could be used as part of a therapy to treat or even cure diabetes. Additionally, the present invention may be used to generate liver endoderm cells from human embryonic stem cells and definite endoderm cells as well. This invention relates to a method for generating definitive endoderm and pancreatic endoderm cells from stem cells, preferably human embryonic stem cells using defined media in the absence of feeder cells. A simply two step procedure to provide pancreatic endoderm cells from embryonic stem cells represents further embodiments of the present invention.
14 Citations
35 Claims
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1. A method of producing human pancreatic endoderm cells from definitive endoderm cells comprising:
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a. exposing human definitive endoderm cells to an effective amount of retinoic acid in a cell differential medium for a period of at least one day; and b. stabilizing the differentiated cells obtained from step a by exposing said cells to a stabilizing medium in the absence of retinoic acid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23)
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22. A method of producing liver endoderm cells from definitive endoderm cells comprising:
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a. exposing definitive endoderm cells to an effective amount of fibroblast growth factor in a cell differential medium for a period of at least one day; and b. stabilizing the differentiated cells obtained from step a by exposing said cells to a stabilizing medium.
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24. A method of producing pancreatic endoderm cells comprising:
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a. producing definitive endoderm cells from human embryonic stem cells by exposing human embryonic stem cells to a basal cell medium comprising an effective amount of a P13K inhibitor as a differentiation agent; b. stabilizing said definitive endoderm cells from step a; c. exposing definitive endoderm cells after step b to an effective amount of retinoic acid in a cell differential medium for a period of at least one day; and d. stabilizing the differentiated cells obtained from step a by exposing said cells to a stabilizing medium in the absence of retinoic acid. - View Dependent Claims (26, 27, 29, 30, 31)
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25. A method of generating definitive endoderm cells from embryonic stem cells, under feeder cell-free conditions, comprising exposing plated embryonic stem cells to a defined media or MEF conditioned media using a growth matrix, and thereafter, exposing the stem cells to a differentiation media which is a defined media comprising effective amounts of Activin A, nodal, TGFβ
- or other TGF component and optionally, an inhibitor of PI3kinase signaling.
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28. A method of generating definitive endoderm cells from embryonic stem cells, comprising exposing said exposed stem cells in the absence of feed cells to a differentiation media comprising elevated levels of Activin A, nodal or TNFβ
- and optionally, an inhibitor of PI3kinase signaling, wherein said differentiation media is a defined media free from fetal calf serum or KSR-type serum components.
- 32. A method of generating pancreatic endoderm cells from human embryonic stem cells said method comprising generating definitive endoderm cells from embryonic stem cells, under feeder cell-free conditions, comprising exposing embryonic stem cells to a defined media or MEF conditioned media using a growth matrix, and thereafter, exposing the stem cells to a differentiation media which is a defined media comprising effective amounts of a SMAD pathway activator and optionally, an inhibitor of PI3kinase signaling for a period of about 3-6 days to produce definitive endoderm cells and thereafter exposing said definitive endoderm cells to a defined media comprising an effective amount of retinoic acid and optionally, an effective amount of FGF10 for a further period of about 5-12 days, preferably 8-10 days to produce pancreatic endoderm cells.
Specification