Cryopreservation of haptenized tumor cells

A - Human Necessities – 61 – K

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Details

A61K 39/00 (2006.01) C12N 5/09 (2010.01) A01N 1/02 (2006.01) A61P 35/00 (2006.01) A61P 37/04 (2006.01)

Patent

CA 2489076

A method of preserving haptenized tumor cells is described. The method employs a freezing medium containing an effective amount of sucrose and human serum albumin in an isotonic buffered saline solution. Cryogenically preserving haptenized cells in such a medium has been found to maintain the integrity of the tumor cells during storage. The haptenized tumor cells also retain cell- associated antigens and haptens, and are as immunogenic, i.e., capable of inducing immunotherapeutic response, as fresh vaccine in a mouse model of metastatic disease. In a specific embodiment, haptenized cells are exposed to a solution of 8 % sucrose, 10% human serum albumin in Hank's buffered solution, and then frozen to -80~C overnight and then stored in a liquid nitrogen freezer. Methods of storing haptenized tumor cells and compositions are also provided.

L'invention concerne un procédé de conservation de cellules tumorales hapténisées. Ce procédé repose sur l'emploi d'un milieu de congélation renfermant une dose efficace de sucrose et de sérum-albumine humain dans une solution saline tamponnée isotonique. On a constaté que la conservation cryogénique de cellules hapténisées dans un tel milieu permettait de préserver l'intégrité de cellules tumorales pendant le stockage. Les cellules tumorales hapténisées conservent par ailleurs des antigènes associés à la cellule et des haptènes et, étant immunogènes, sont capables d'induire une réponse immunothérapeutique en tant que vaccin frais dans un modèle de souris de maladie métastasique. Dans un mode de réalisation spécifique, les cellules hapténisées sont exposées à une solution de 8 % de sucrose, de 10 % de sérum-albumine humain dans une solution de Hank tamponnée, puis congelée à -80 ·C au cours de la nuit et conservées dans un congélateur à l'azote liquide. L'invention concerne également des méthodes de stockage des cellules tumorales et de compositions hapténisées.

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