00022101T: Development of Anti-Canine Il-2R? Antibodies Using CpG Oligodeoxynucleotide Vaccination

Grant Status: Closed

Grant Amount: $4,685.6
Dr. Stuart Helfand, DVM, Oregon State University
January 1, 2006 - June 30, 2006
Breed(s): Boxer
Research Program Area: Treatment

Abstract

Despite progress in treating canine lymphoma, most affected dogs eventually develop resistance to chemotherapy and succumb to their disease. In human medicine, the a subunit of the interleukin-2 receptor (IL-2Ra ) has been developed as a target for immunotherapy of chemoresistant lymphoma patients. Intensively studied as a molecule present on normal lymphocytes that are activated, IL-2Ra has recently been developed as a target on malignant lymphocytes that have been found to express this protein inappropriately. This has been accomplished using anti-IL-2Ra monoclonal antibody (Mab) to deliver cellular toxins or radioisotopes directly to the cancer cells, a strategy that overcomes drug resistance. We would now like to develop such an antibody against the canine Il-2Rasubunit that could benefit dogs with lymphoma. Our rationale for pursuing this approach stems from molecular data we generated indicating that a high percentage of canine lymphomas from Golden Retrievers and Rottweilers express Il-2Ra Having synthesized canine recombinant (cr) IL-2R?a using the gene sequence we cloned, we are now ready to produce and validate Mabs against it. To accomplish these goals, 1) we will employ a novel immunization strategy to prepare murine anti-canine IL-2Ra Mabs, 2) develop a test using anti-canine IL-2Ra Mabs for the detection of IL-2R?ashed into the blood of Golden Retriever and Rottweiler lymphoma patients, and 3) screen lymphoma biopsies from Golden Retrievers and Rottweilers for IL-2Ra. Mabs generated to Canine IL-2R?a will be a powerful tool in the diagnosis, prognosis, and treatment of canine lymphoma.

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