Articles and methods for stem cell differentiation
Articles and methods for stem cell differentiation are generally described. In some embodiments, an article for stem cell differentiation may comprise an oxygen permeable substrate having at least a portion of a surface coated with a matrix. The matrix may allow the surface chemistry of the substrate to be altered, such that the cell-substrate surface interactions may be finely controlled without substantially affecting the oxygen permeability of the substrate. The surface chemistry may be altered to promote directed stem cell differentiation by, e.g., modification of the matrix surface with a specific density of biological molecules. In some embodiments, methods for stem cell differentiation may comprise directing the differentiation of stem cells on the articles, described herein, under suitable environmental conditions. Articles and methods, described herein, may be free of xenogeneic components and particularly well-suited for applications involving the differentiation of human stem cells into specific lineages.
1. An article for use in stem cells differentiation, comprising:
an oxygen permeable substrate having at least a portion of a surface coated with a synthetic matrix having an average thickness of less than 90 nm, wherein the synthetic matrix is covalently crosslinked, between about 30% and about 80% of all groups on the surface of the synthetic matrix are amide bond groups, and biological molecules are covalently bound to the surface of the synthetic matrix via the amide bonds, and wherein the oxygen permeability/thickness of the article is greater than or equal to about 250×10 −14 mol sec −1 cm −2 mm Hg −1 .
2. The article of claim 1 , wherein the synthetic matrix is a hydrogel.
3. The article of claim 1 , wherein the oxygen permeable substrate is free of non-human material.
4. The article of claim 1 , wherein the synthetic matrix consists essentially of synthetic polymers.
5. The article of claim 1 , wherein between about 30% and about 54% of a surface of the synthetic matrix is covalently bound to the biological molecules.
6. The article of claim 1 , wherein the oxygen permeability/thickness of the oxygen permeable substrate coated with the synthetic matrix is at least about 80% of the oxygen permeability/thickness of an essentially identical oxygen permeable substrate lacking the matrix.
7. The article of claim 1 , wherein the oxygen permeable substrate is a silicon rubber.
8. The article of claim 1 , wherein the biological molecules are proteins.
9. The article of claim 1 , wherein the percent of the amide bonds on the surface of the matrix is between about 30% and about 54%.
10. The article of claim 1 , wherein the shelf life of the article is greater than or equal to 2.5 weeks.
11. The article of claim 1 , wherein the synthetic matrix comprises acrylates.
12. The article of claim 1 , wherein the synthetic matrix is a hydrogel comprising covalently crosslinked acrylate polymers.
13. The article of claim 12 , wherein the synthetic matrix comprises carboxylic acid groups on the surface of the synthetic matrix.