Claims for Patent: 5,308,763

Summary for Patent: 5,308,763

Title:	Method of making primary culture of olfactory neurons
Abstract:	A method of producing primary cultures of olfactory neurons which are purified from sustentacular cells and basal cells. The neuronal cells demonstrate responsiveness to physiologic levels of odorants and express Olfactory Marker Protein (OMP). The steps required to obtain the primary cultures are: 1. providing olfactory epithelium of an animal; 2. dissociation of neuronal cells using enzymatic digestion; 3. filtering using a mesh filter having a pore size between 10 and 25 microns to separate cell aggregates; 4. removal of the cell aggregates; and 5. plating the dissociated neuronal cells in a nutrient medium containing D-valine, Nerve Growth Factor (NGF), and other significant ingredients to obtain a culture of olfactory neurons. In addition to OMP the neurons are capable of expressing vimentin, neuron-specific enolase but not expressing glial fibrillary acidic proteins, S-100 protein, keratin, or neurofilament protein.
Inventor(s):	Ronnett; Gabriele V. (Baltimore, MD), Hester; Lynda (Towson, MD), Snyder; Solomon H. (Baltimore, MD)
Assignee:	The Johns Hopkins University (Baltimore, MD)
Application Number:	07/848,687
Patent Claims:	1. A method of producing primary cultures of olfactory neurons substantially purified from sustentacular cells and basal cells, said neurons demonstrating responsiveness to physiologic levels of odorants, said neurons expressing vimentin, olfactory marker protein and neuron-specific enolase, said neurons not expressing glial fibrillary acidic protein, S-100 protein, keratin, or neurofilament protein, comprising the steps of: providing olfactory epithelium of an animal; enzymatically digesting the olfactory epithelium to dissociate neuronal cells of said olfactory epithelium; passing said dissociated neuronal cells of said olfactory epithelium through a mesh filter having a pore size of between about 10 and 25 microns to separate cell aggregates which fail to pass through the mesh filter from said dissociated neuronal cells; removing said cell aggregates from said dissociated neuronal cells; plating said dissociated neuronal cells in a nutrient medium comprising D-valine, cytosine arabinoside, and NGG on a solid substrate to provide a primary culture of olfactory neurons substantially purified from sustentacular cells and basal cells, said neurons demonstrating responsiveness to physiologic levels of odorants, said neurons expressing vimentin, olfactory marker protein and neuron-specific enolase, said neurons not expressing glial fibrillary acidic protein, S-100 protein, keratin, or neurofilament protein. 2. The method of claim 1 wherein the animal is a neonate. 3. The method of claim 1 wherein the neuronal cells are dissociated by mechanical and enzymatic means. 4. The method of claim 3 wherein the mechanical means comprises trituration. 5. The method of claim 1 wherein the neuronal cells are dissociated with a mixture of hyaluronidase, DNAse, collagenase, and dispase. 6. The method of claim 1 wherein the mesh filter has a pore size of about 20 microns. 7. The method of claim 1 wherein the mesh filter has a pore size of about 10 microns. 8. The method of claim 1 wherein the solid substrate is coated with one or more matrix substances selected from the group consisting of: laminin, fibronectin, and matrigel. 9. The method of claim 1 wherein the animal is a rat. 10. The method of claim 1 wherein the enzymatic digestion employs one or more enzymes selected from the group consisting of: hyaluronidase, DNAse, collagenase, and dispase.

Details for Patent 5,308,763

Applicant	Tradename	Biologic Ingredient	Dosage Form	BLA	Approval Date	Patent No.	Expiredate
Bausch & Lomb Incorporated	VITRASE	hyaluronidase	Injection	021640	05/05/2004		2011-10-01
Bausch & Lomb Incorporated	VITRASE	hyaluronidase	Injection	021640	12/02/2004		2011-10-01
Amphastar Pharmaceuticals, Inc.	AMPHADASE	hyaluronidase	Injection	021665	10/26/2004		2011-10-01
Akorn, Inc.	HYDASE	hyaluronidase	Injection	021716	10/25/2005		2011-10-01
Smith & Nephew, Inc.	SANTYL	collagenase	Ointment	101995	06/04/1965		2011-10-01