Claims for Patent: 6,242,252

Summary for Patent: 6,242,252

Title:	Hepatic progenitors and method of isolating same
Abstract:	This invention relates to methods of isolating hepatic progenitors utilizing panning techniques and fluorescence activated cell sorting. This invention further relates to isolated hepatic progenitors and to a method of treating liver dysfunction as well as to methods of forming artificial livers.
Inventor(s):	Reid; Lola M. (Chapel Hill, NC), Sigal; Samuel H. (Riverdale, NY), Brill; Shlomo (Ramat-Gan, IL), Holst; Patricia A. (Ossining, NY)
Assignee:	Albert Einstein College of Medicine of Yeshiva University (Bronx, NY)
Application Number:	09/154,222
Patent Claims:	1. A method of isolating hepatic progenitors from liver comprising: (a) preparing a single cell suspension of liver cells; (b) panning said suspension utilizing antibodies specific for hemopoietic cells, mesenchymal cells, mature liver cells, or combinations thereof, to remove said hemopoietic cells, mesenchymal cells, and mature liver cells from said suspension; (c) performing fluorescence activated cell sorting utilizing said antibodies so as to remove hemopoietic cells, mesenchymal cells, and mature liver cells, from said cell suspension; and (d) performing multiparametric fluorescence activated cell sorting on said suspension utilizing at least one antibody to a hepatic cell marker, side scatter forward scatter, autofluorescence, or combinations thereof, such that the cells remaining in said suspension are enriched hepatic progenitors. 2. The method of claim 1 wherein the antibody specific for hemopoietic cells is a monoclonal antibody. 3. The method of claim 2 wherein said monoclonal antibody is OX-43 and/or OX-44. 4. The method of claim 1 wherein said hepatic cell marker is OC.3. 5. The method of claim 1 wherein said single cell suspension contains an agent capable of removing calcium from liver cell surface. 6. The method of claim 1 wherein said single cell suspension contains EGTA. 7. The method of claim 1 wherein said single cell suspension contains an enzyme capable of dissociating liver cells. 8. The method of claim 1 wherein said single cell suspension contains collagenase. 9. The method of claim 1 wherein said single cell suspension is chilled. 10. The method of claim 1 wherein said single cell suspension is at a temperature of between about 2 and 20.degree. C. 11. The method of claim 1 wherein the liver is neonatal liver. 12. The method of claim 1 wherein the liver is embryonic liver. 13. The method of claim 1 wherein the liver is adult liver. 14. A method of isolating hepatic progenitors from liver comprising: (a) preparing a single cell suspension of liver cells; and (b) panning said suspension utilizing antibodies specific for hemopoietic cells, mesenchymal cells, mature liver cells, or combinations thereof, to remove said hemopoietic cells, mesenchymal cells, and mature liver cells, or combinations thereof, from said suspension such that the cells remaining in said suspension are enriched hepatic progenitors. 15. The method of claim 14 which further comprises performing fluorescence activated cell sorting utilizing said antibodies. 16. The method of claim 14 which further comprises performing multiparametric fluorescence activated cell sorting on said suspension utilizing at least one antibody to a hepatic cell marker, side scatter, forward scatter, autofluorescence or combinations thereof. 17. The method of claim 14 wherein the antibody specific for hemopoietic cells is a monoclonal antibody. 18. The method of claim 17 wherein said monoclonal antibody is at least one of OX-43 and OX-44. 19. The method of claim 14 wherein said hepatic cell marker is OC.3. 20. The method of claim 14 wherein said single cell suspension comprises an agent capable of removing calcium from liver cell surface. 21. The method of claim 14 wherein said single cell suspension comprises EGTA. 22. The method of claim 14 wherein said single cell suspension comprises an enzyme capable of dissociating liver cells. 23. The method of claim 14 wherein said single cell suspension contains collagenase. 24. The method of claim 14 wherein said single cell suspension is chilled. 25. The method of claim 14 wherein said single cell suspension is at a temperature of between about 2 and 20.degree. C. 26. The method of claim 14 wherein the liver is neonatal liver. 27. The method of claim 14 wherein the liver is embryonic liver. 28. The method of claim 14 wherein the liver is adult liver. 29. The method of claim 1 wherein the mesenchymal cells comprise endothelial cells. 30. The method of claim 1 wherein the mature liver cells comprise at least one of hepatocytes and bile duct cells. 31. The method of claim 14 wherein the mesenchymal cells comprise endothelial cells. 32. The method of claim 14 wherein the mature liver cells comprise at least one of hepatocytes and bile duct cells.

Details for Patent 6,242,252

Applicant	Tradename	Biologic Ingredient	Dosage Form	BLA	Approval Date	Patent No.	Expiredate
Smith & Nephew, Inc.	SANTYL	collagenase	Ointment	101995	06/04/1965		2011-08-07