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UCLA scientists create army of tumor-fighting immune cells and watch as they attack cancer
Date:7/12/2010

Researchers at UCLA's Jonsson Comprehensive Cancer Center created a large, well armed battalion of tumor-seeking immune system cells and watched, in real time using Positron Emission Tomography (PET), as the special forces traveled throughout the body to locate and attack dangerous melanomas.

The gene therapy work, done with melanomas grown in mice, employed a crippled HIV-like virus to serve as a vehicle to arm the lymphocytes with T cell receptors, which caused the lymphocytes to become specific killers of cancerous cells. A reporter gene, which glows "hot" during PET scanning, also was inserted into the cells so researchers could track the genetically engineered lymphocytes after they were injected into the blood stream, made their way to the lungs and lymph nodes and then specifically homed in on the tumors wherever they were located within the body.

"We're trying to genetically engineer the immune system to become a cancer killer and then image how the immune system operates at the same time," said Dr. Antoni Ribas, an associate professor of hematology/oncology, a researcher at UCLA's Jonsson Comprehensive Cancer Center and the senior author of the study. "We knew this approach of arming the lymphocytes with T cell receptors showed significant anti-tumor activity based on studies in humans. Now, by tracking the immune system's reaction to cancer and imaging it in real time, we can project how the same process that succeeded in mice might behave in people."

The study is published July 12, 2010 in the early online edition of the journal Proceedings of the National Academy of Sciences.

"The novelty of our work is that we were able to pack together the cancer specific T cell receptor and the PET reporter genes in a single vector and use it in mice with an intact immune system that closely resembles what we would see in real patients," said Dr. Richard Koya, an assistant professor of surgical oncology at UCLA's Dav
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Contact: Kim Irwin
kirwin@mednet.ucla.edu
310-206-2805
University of California - Los Angeles
Source:Eurekalert

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