Methods for increasing definitive endoderm production
Disclosed herein are methods for increasing the production of definitive endoderm cells from pluripotent stem cells. Also disclosed herein are agents capable of increasing definitive endoderm cell production.
1. An in vitro method for increasing production of human definitive endoderm cells comprising:
providing an inhibitor of E-cadherin-mediated cellular adhesion to human pluripotent stem cells, thereby inhibiting adhesion between said human pluripotent stem cells; and
differentiating said human pluripotent stem cells by contacting said cells with a medium comprising at least one TGFβ superfamily growth factor, thereby increasing the production of human definitive endoderm cells.
2. The method of claim 1 , wherein the inhibitor of E-cadherin-mediated cellular adhesion is an antagonist of E-cadherin.
3. The method of claim 2 , wherein the antagonist of E-cadherin binds E-cadherin.
4. The method of claim 2 , wherein the antagonist of E-cadherin is a polyclonal or a monoclonal E-cadherin antibody.
5. The method of claim 2 , wherein the antagonist of E-cadherin is a peptide.
6. The method of claim 5 , wherein the peptide is an E-cadherin peptide corresponding to an E-cadherin extracellular domain at amino acid residues 600-700 of human E-cadherin (SEQ ID NO:1).
7. The method of claim 2 , wherein the antagonist of E-cadherin is a peptide analog.
8. The method of claim 1 , wherein the inhibitor of E-cadherin-mediated cellular adhesion comprises a calcium ion chelator.
9. The method of claim 8 , wherein the calcium ion chelator is selected from the group consisting of ethylenediaminetetraacetic acid (EDTA), ethyleneglycoltetraacetic acid (EGTA), 1,10 phenanthroline, diethylenetriaminepentaacetate (DTPA), hydroxyethylethylenediaminetriacetic acid (HEEDTA), diaminocyclohexanetetraacetic acid (CDTA), 1,2-Bis(2-aminophenoxy)ethane-N,N,N′,N′-tetraacetic acid (BAPTA), and pharmaceutically acceptable salts thereof.
10. The method of claim 1 , wherein said human pluripotent stem cells are provided with said inhibitor of E-cadherin-mediated cellular adhesion in a first medium, and wherein said pluripotent human stem cells are differentiated in a second medium.
11. The method of claim 1 , wherein said human pluripotent stem cells comprise embryonic stem cells.
12. The method of claim 11 , wherein said human embryonic stem cells are grown on a feeder layer prior to differentiation.
13. The method claim 1 , wherein said human pluripotent stem cells are maintained in a culture vessel prior to differentiation.
14. The method of claim 13 , wherein said culture vessel further comprises fibroblasts.
15. The method of claim 1 , wherein said TGFβ superfamily growth factor comprises a member of the Nodal/Activin subgroup.
16. The method of claim 1 , wherein said TGFβ superfamily growth factor comprises a member of the BMP subgroup.