Claims for Patent: 4,743,552

Summary for Patent: 4,743,552

Title:	Method for growth in tissue culture of normal colonic epithelial cells and method for determination of preneoplastic color cells
Abstract:	The invention concerns a method for the routine primary culture of human colonic epithelial cells within a monolayer. 12-0-tetradecanoylphorbol-13-acetate (TPA) enhanced DNA synthesis an average of 8 fold when assayed by [.sup.3 h]dThd labeling indices (L.I.) in colonic epithelial cells from familial polyposis patients and in tubular adenomas. No such stimulation by TPA was seen in cells from high-risk patients without familial polyposis, or in cells from low-risk subjects.
Inventor(s):	Friedman; Eileen A. (New York, NY), Lipkin; Martin (New York, NY)
Assignee:	Sloan-Kettering Institute for Cancer Research (New York, NY)
Application Number:	06/655,090
Patent Claims:	1. Method for monolayer culture of normal human colonic epithelial crypt cells in tissue culture which comprises: (a) digesting said cells with a mixture of enzymes initially at an elevated temperature of about 37.degree. C. for about 10 minutes and then at a lower temperature of about 25.degree. C. for between about 30 minutes and about 60 minutes with an enzyme mixture no more than one-fifth the quantity used for colonic tumor cells comprising enzymes selected from the group consisting of hyaluronidase, collagenase and neuraminidase, wherein said enzyme mixture comprises an approximate ratio consisting of 300 units hyalurondase to 600 units collagenase to 4 units neuraminadase per 1-3 cubic millimeter biopsy; (b) mixing the digested cells with an amount of a growth medium sufficient to allow plating of the cell growth medium mixture; and (c) plating the cell growth medium mixture on an adhesive material, thereby creating a monolayer culture of normal human colonic epithelial cells. 2. Method of claim 1, wherein the growth medium is NCTC 168 which is supplemented with fetal calf serum, transferrin, insulin, hydrocortisone, epidermal growth factor, and selenous acid.

Details for Patent 4,743,552

Applicant	Tradename	Biologic Ingredient	Dosage Form	BLA	Approval Date	Patent No.	Expiredate
Bausch & Lomb Incorporated	VITRASE	hyaluronidase	Injection	021640	05/05/2004		2039-03-29
Bausch & Lomb Incorporated	VITRASE	hyaluronidase	Injection	021640	12/02/2004		2039-03-29
Amphastar Pharmaceuticals, Inc.	AMPHADASE	hyaluronidase	Injection	021665	10/26/2004		2039-03-29
Akorn, Inc.	HYDASE	hyaluronidase	Injection	021716	10/25/2005		2039-03-29
Smith & Nephew, Inc.	SANTYL	collagenase	Ointment	101995	06/04/1965		2039-03-29