Claims for Patent: 8,986,996

Summary for Patent: 8,986,996

Title:	Large-scale propagation and maintenance method of embryoid bodies generated from stem cells
Abstract:	The present invention relates to a large-scale propagation and maintenance method of embryoid bodies generated from stem cells. More particularly, the present invention relates to a large-scale propagation and maintenance method of embryoid bodies retaining their intrinsic characteristics for a long period of time, comprising the step of continuously subculturing embryoid bodies that are primarily produced from embryonic stem cells or from induced pluripotent stem cells. According to the method of the present invention, after preparation of embryoid bodies from a limited number of stem cells, large-scale production and maintenance of embryoid bodies can be realized by a simple mechanical subculturing method without the continuous supply of stem cells.
Inventor(s):	Cho; Yee Sook (Daejeon, KR), Son; Mi Young (Daejeon, KR), Kim; Hyun Jin (Daejeon, KR)
Assignee:	Korea Research Institute of Bioscience and Biotechnology (Daejeon, KR)
Application Number:	13/669,896
Patent Claims:	1. A large-scale method of propagating embryoid bodies generated from stem cells, comprising the steps of: (a) culturing the embryoid bodies; (b) inducing division of embryoid bodies by mechanical or enzymatic methods; and, (c) subculturing the embryoid bodies of step (b) in suspension culture. 2. The method according to claim 1, wherein the stem cells are pluripotent stem cells. 3. The method according to claim 1, wherein the stem cells are embryonic stem cells or induced pluripotent stem cells. 4. The method according to claim 1, wherein the stem cell are derived from human. 5. The method according to claim 1, wherein the embryoid bodies are established by suspension culture of colonies of collected stem cells cut into the dimension of 10 to 1000 .mu.m on all sides, undisturbed embryonic stem cell colonies or induced pluripotent stem cell colonies. 6. The method according to claim 1, wherein the embryoid bodies are established by collecting stem cells cut into 1/20 to 1/2-sized pieces and then culturing them in suspension. 7. The method according to claim 1, wherein the subculturing is performed 1 to 200 times. 8. The method of claim 1, wherein mechanical division is performed with a device selected from the group consisting of: a blade, a tissue chopper, a needle, a pipette, an EBD (embryoid body divider) or a scraper. 9. The method according to claim 8, wherein the EBD includes a body that has a top having no cutting edge and a bottom having a cutting edge; and a micropatterning part that is attached onto the bottom surface of the body to function to cut and divide embryoid bodies. 10. The method according to claim 8, wherein the EBD is MEBD (manual EBD) or AEBD (automatic EBD). 11. The method according to claim 8, wherein the method using the EBD comprises the steps of: (a) preparing an embryoid body in a coated culture vessel; (b) placing the EBD on the top of the culture vessel horizontally; (c) applying a uniform pressure to the culture vessel using the EBD to divide the embryoid body; and (d) removing the EBD. 12. The method according to claim 11, wherein the culture vessel has a top of 1,000-8,000 .mu.m width, a bottom of 100-8,000 .mu.m width, and a depth of 2,000-20,000 .mu.m; a groove having one selected from the group consisting of flat, round, square, and V-shaped grooves in its bottom; and its surface coated with one selected from the group consisting of polylysine, collagen, gelatin, laminin, cell matrix component, and nanopolymer. 13. The method according to claim 8, wherein the method using the EBD comprises the steps of: (a) preparing an embryoid body in a multi-well plate for EB; (b) placing the EBD on the top of the multi-well plate horizontally; (c) applying a uniform pressure to the multi-well plate using the EBD to divide the embryoid body; and (d) removing the EBD. 14. The method of claim 1, wherein enzymatic division is performed using an enzyme selected from the group consisting of: collagenase, accutase, dispase or trypsin. 15. The method of claim 1, wherein steps (a)-(c) are repeated.

Details for Patent 8,986,996

Applicant	Tradename	Biologic Ingredient	Dosage Form	BLA	Approval Date	Patent No.	Expiredate
Smith & Nephew, Inc.	SANTYL	collagenase	Ointment	101995	06/04/1965		2030-05-07