Synthetic surfaces for culturing cells in chemically defined media
Synthetic surfaces capable of supporting culture of eukaryotic cells including stem cells and undifferentiated human embryonic stem cells in a chemically defined medium include a swellable (meth)acrylate layer and a polypeptide conjugated to the swellable (meth)acrylate layer. The swellable (meth)acrylate layer may be formed by polymerizing monomers in a composition that includes a carboxyl group-containing (meth)acrylate monomer, a cross-linking (di- or higher-functional) (meth)acrylate monomer, and a hydrophilic monomer capable of polymerizing with the carboxyl group-containing (meth)acrylate monomer and the cross-linking (meth)acrylate monomer. The swellable (meth)acrylate layer has an equilibrium water content in water of between about 5% and about 70%. The conjugated peptide may include an RGD amino acid sequence.
1. A cell culture article, comprising:
a substrate having a surface;
a swellable (meth)acrylate layer disposed on the surface of the substrate, wherein the swellable (meth)acrylate layer is formed from a composition comprising a carboxyl group-containing (meth)acrylate monomer, a cross-linking (meth)acrylate monomer, and a hydrophilic monomer capable of polymerizing with the carboxyl gtow-containing (meth)acrylate monomer and the cross-linking (meth)acrylate monomer, and
a peptide conjugated to a carboxyl group of the carboxyl group-containing monomer of the swellable (meth)acrylate layer,
wherein the peptide comprises an amino acid sequence selected from the group consisting of:
LysGlyGlyAsnGlyGluProArgGlyAspThrTyrArgAlaTyr (SEQ ID NO:4);
AsnGlyGluProArgGlyAspThrTyaArgAlaTyr (SEQ ID NO:5)
LysGlyGlyLys 4 AsnGlyGluProArgGlyAspThrTyrArgAlaTyrAsp 17 (SEQ ID NO:6), where Lys 4 and Asp 17 together form an amide bond to cyclize a portion of the polypeptide;
LysGlyGlyLys 4 GluProArgGlyAspThrTryArgAsp 13 (SEQ ID NO:7), where Lys 4 and Asp 13 together form an amide bond to cyclize a portion of the polypeptide;
LysGlyGlyCys 4 AsnGlyGluProArgGlyAspThrTyrArgAlaTyrCys 17 (SEQ ID NO:8), where Cys 4 and Cys 17 together form a disulfide bond to cyclize a portion of the polypeptide;
LysGlyGlyCys 4 GluProArgGlyAspThrTryArgCys 13 (SEQ ID NO:9), where Cys 4 and Cys 13 together form a disulfide bond to cyclize a portion of the polypeptide;
GlyArgGlyAspSerProLys (SEQ ID NO:11); and
LysGlyGlyAlaValThrGlyArgGlyAspSerProAlaSerSer (SEQ ID NO:12).
2. The cell culture article of claim 1 , wherein the swellable (meth)acrylate layer has an equilibrium water content (EWC) calculated from the formula:
EWC (%)=[(Wgel−Wdry)/(Wgel)]* 100,
in water, of between about 5% and about 50%.
3. The cell culture article of claim 1 , wherein the swellable (meth)acrylate layer has an equilibrium water content in water of between about 10% and about 40%.
4. The cell culture article of claim 1 , wherein the carboxyl group-containing (meth)acrylate monomer is 2-carboxyethylacrylate.
5. The cell culture article of claim 1 , wherein the cross-linking (meth)acrylate monomer is tetra(ethylene glycol) dimethacrylate or tetra(ethylene glycol) diacrylate.
6. The cell culture article of claim 1 , wherein the hydrophilic monomer is selected from the group consisting of hydroxyethyl methacrylate, hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, di(ethylene glycol) ethyl ether methacrylate, ethylene glycol methyl ether methacrylate.
7. The cell culture article of claim 1 , wherein the ratio, by volume, of the cross-linking (meth)acrylate monomer to the carboxy group-containing meth(acrylate) monomer to the hydrophilic monomer is about 1-10 to about 10-40 to about 60-90.
8. The cell culture article of claim 1 , wherein the ratio by volume, of the cross-linking (meth)acrylate monomer to the carboxy group-containing meth(acrylate) monomer to the hydrophilic monomer is about 3 to 20 to 80.
9. The article of claim 1 , wherein the swellable (meth)acrylate layer is free of polypeptide crosslinkers.
10. The article of claim 1 , wherein the swellable (meth)acrylate layer has a uniform thickness and wherein the swellable (methacrylate) layer is less than about 2 micrometers in thickness.