Preclinical, laboratory studies suggest a novel immunotherapy could potentially work like a vaccine against metastatic cancers, according to scientists at Virginia Commonwealth University Massey Cancer Center. Results from a recent study show the therapy could treat metastatic cancers and be used in combination with current cancer therapies while helping to prevent the development of new metastatic tumors and train specialized immune system cells to guard against cancer relapse.
Recently published in the journal Cancer Research, the study detailed the effects of a molecule engineered by lead author Xiang-Yang Wang, Ph.D., on animal and cell models of melanoma, prostate and colon tumors. The molecule called Flagrp-170 consists of two distinct proteins, glucose-regulated protein 170 (Grp170), known as a "molecular chaperone," and a "danger signal" derived from flagellin, a protein commonly found in bacteria. The researchers used modified viruses, or adenoviruses, that can no longer replicate to transport Flagrp-170 directly to the tumor site to achieve localized vaccination. The novel therapy caused a profound immune response that significantly prolonged survival in animal models.
"Successfully promoting antitumor immunity will help eradicate tumor cells, control cancer progression and help prevent tumor relapse," says Wang, Harrison Scholar, member of the Cancer Molecular Genetics research program at VCU Massey Cancer Center and associate professor of Human and Molecular Genetics at VCU School of Medicine. "This immunotherapy has the potential to be used alone or in combination with conventional cancer treatments to develop and establish immune protection against cancer and its metastases."
Grp170 is currently being explored for its potential as a "cancer vaccine" because it has been shown to help the immune system recognize cancer antigens. Antigens are molecules from foreign objects such as bacteria, viruses or cancer that, when detected, provoke an immune response aimed at attacking them. However, because cancer cells can alter the microenvironment surrounding a tumor, they are able to suppress immune responses and continue replicating without being attacked by the body's natural defenses.
The chimeric chaperone Flagrp-170, created by strategically fusing a fragment of flagellin to Grp170, not only enhances antigen presentation, it also stimulates additional immune signals essential for functional activation of specialized immune cells, including dendritic cells, CD8+ T lymphocytes and natural killer (NK) cells. Dendritic cells act as messengers between the innate and adaptive immune systems. Once activated in response to a stimulus such as Flagrp-170, dendritic cells migrate to lymph nodes where they interact with other immune cells such as T lymphocytes to shape the body's immune response. CD8+ T lymphocytes and NK cells are known to respond to tumor formation and kill cancer cells by triggering apoptosis, a form of cell suicide.
"Overcoming cancer's ability to suppress the body's natural immune responses and restore or develop immunity for tumor eradication is the goal of cancer immunotherapy," says Wang. "More experiments are needed, but we are hoping Flagrp-170 may one day be used in formulating more effective therapeutic cancer vaccines."
Moving forward, Wang and his team are working to better understand the molecular mechanisms responsible for Flagrp-170's therapeutic effects. Additional studies are underway to more efficiently target and deliver Flagrp-170 to tumor sites in order to provoke a more robust and durable immune response.
Wang collaborated on this research with Paul Fisher, M.Ph., Ph.D., Thelma Newmeyer Corman Endowed Chair in Cancer Research and program co-leader of Cancer Molecular Genetics at VCU Massey Cancer Center, chairman of VCU's Department of Human and Molecular Genetics and director of the VCU Institute of Molecular Medicine; Xiaofei Yu; Chunquing Guo, Ph.D.; Huanfa Yi; and Jie Qian, Ph.D., all from VCU's Department of Human and Molecular Genetics and the VCU Institute of Molecular Medicine; and John R. Subjeck from the Department of Cellular Stress Biology at Roswell Park Cancer Institute.
This research was supported by NIH grants CA129111 and CA154708; the American Cancer Society, the Department of Defense and, in part, by funding from VCU Massey Cancer Center's NIH-NCI Cancer Center Support Grant P30 CA016059.
The full manuscript of this study is available online at: http://cancerres.aacrjournals.org/content/early/2013/01/18/0008-5472.CAN-12-1740.long.
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About VCU Massey Cancer Center:
VCU Massey Cancer Center is one of only 67 National Cancer Institute-designated institutions in the country that leads and shapes America's cancer research efforts. Working with all kinds of cancers, the Center conducts basic, translational and clinical cancer research, provides state-of-the-art treatments and clinical trials, and promotes cancer prevention and education. Since 1974, Massey has served as an internationally recognized center of excellence. It has one of the largest offerings of clinical trials in Virginia and serves patients in Richmond and in four satellite locations. Its 1,000 researchers, clinicians and staff members are dedicated to improving the quality of human life by developing and delivering effective means to prevent, control and ultimately to cure cancer. Visit Massey online at www.massey.vcu.edu or call 877-4-MASSEY for more information.
About VCU and the VCU Medical Center:
Virginia Commonwealth University is a major, urban public research university with national and international rankings in sponsored research. Located in downtown Richmond, VCU enrolls more than 31,000 students in 222 degree and certificate programs in the arts, sciences and humanities. Sixty-six of the programs are unique in Virginia, many of them crossing the disciplines of VCU's 13 schools and one college. MCV Hospitals and the health sciences schools of Virginia Commonwealth University compose the VCU Medical Center, one of the nation's leading academic medical centers. For more, see www.vcu.edu.