Methods for culturing human embryonic stem cells
The present invention discloses a method for improving growth and survival of single human embryonic stem cells. The method includes the step of obtaining a single undifferentiated HES cell; mixing the single undifferentiated cell with an extracellular matrix (ECM) to encompass the cell; and inoculating the mixture onto feeder cells with a nutrient medium in a growth environment. Therefore the single cells can survive, proliferate and grow in vitro.
1. A method of culturing single undifferentiated human embryonic stem cells (HES), comprising:
(a) obtaining single-and-undifferentiated HES cells;
(b) mixing the cells with an extracellular matrix to form a mixture prior to step (c), wherein the extracellular matrix in the mixture encompasses the cells; and
(c) inoculating the mixture onto the feeder cells with a nutrient medium.
2. The method of claim 1 , wherein the human embryonic stem cells are HES-3.
3. The method of claim 1 , wherein the extracellular matrix is a human extracellular matrix extracted from human embryonic stem cells.
4. The method of claim 1 , wherein the extracellular matrix is prepared from basement membrane preparation extracted from Engelbreth-Holm-Swarm mouse sarcoma.
5. The method of claim 1 , wherein the extracellular matrix is prepared from an isolated matrix component or the combination selected from the group consisting of collagen, elastin, fibronectin, laminin and fibrillin.
6. The method of claim 1 , wherein the extracellular matrix is prepared from collagen.
7. The method of claim 1 , wherein the feeder cells are selected from the group consisting of primary mouse embryonic fibroblasts (PMEF), mouse embryonic fibroblasts (MEF), murine fetal fibroblasts (MFF), human embryonic fibroblasts (HEF), human fetal muscle cells (HFM), human fetal skin cells (HFS), human adult skin cells, human foreskin fibroblasts (HFF), human adult fallopian tube epithelial cells (HAFT) and human marrow stromal cells (HMS).
8. The method of claim 1 , wherein the feeder cells are mouse embryonic fibroblasts (MEF), human adult skin cells or human foreskin fibroblasts (HFF).
9. The method of claim 1 , wherein the method of obtaining a single undifferentiated HES cells comprises:
(a) selecting a group of undifferentiated cells from a cell culture; and
(b) dissociating the group of undifferentiated cells into single cells.
10. The method of claim 9 , wherein the dissociation method is enzymatic degradation.
11. The method of claim 10 , wherein the enzymatic degradation is using collagenase.
12. The method of claim 1 , wherein the method is used for establishing a clonal HES cell line.
13. The method of claim 1 , wherein the method is suitable for gene transfection.