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UArizona Health Sciences Researcher to Study Cellular Stress Responses Common in Cancer, Aging

Tuesday, August 25, 2020

TUCSON, Ariz. – Understanding how cells respond to stress may provide new building blocks for designing future cancer and aging treatments, and a University of Arizona Health Sciences researcher has received a five-year, $1.6 million grant from the National Institute of General Medical Sciences to further study these implications.

Tim Bolger, PhD, research investigator in his laboratory at the University of Arizona. (Photo: Michele Vaughn/UArizona Department of Molecular and Cellular Biology)Leading the research is Timothy Bolger, PhD, a research member in the UArizona Cancer Center’s Cancer Biology Program and assistant professor in the Department of Molecular and Cellular Biology at the UArizona College of Science. His lab focuses on how the critical process of protein synthesis (how proteins are made) is altered when facing adverse conditions, such as a lack of oxygen or nutrients. This is known as cellular stress. When this process is not properly regulated, cancer cells can promote their own growth and survival in tumors.

Dr. Bolger and colleagues wrote about these mechanisms in a paper published a year ago in the journal Molecular Biology of the Cell, or MBoC.

“If a lack of nutrients exists, the protein synthesis response should make enzymes that can make more of the missing nutrient,” he said. “Or if little oxygen is present, that can alter the rates at which the cell uses energy and molecules until normal levels are restored. Sometimes this does not occur, however, and it can have implications for cancer and aging.”

Dr. Bolger’s research will utilize yeast models to examine a protein called Ded1, also known as DEAD-box helicase 3 X-linked or DDX3X, in humans. This particular enzyme (a protein that speeds up chemical reactions in the body) is known to act differently under cellular stress, Dr. Bolger said. He wants to study the activity occurring around this enzyme – along a molecular pathway – that causes it to function differently during the protein synthesis response, potentially leading to cancer growth.

Dr. Tim Bolger and Peyman Aryanpur, a postdoctoral student in the Bolger Laboratory at the University of Arizona. (Photo: Michele Vaughn/UArizona Department of Molecular and Cellular Biology)Mutations to the DDX3X protein have been linked to several cancers, especially medulloblastoma, a fast-growing form of cancer that occurs in the lower, back part of the brain, known as the cerebellum. Medulloblastoma, which commonly affects children and young adults, is the most common type of cancerous brain tumor in children, with 250 to 500 cases diagnosed per year – more than 70% in children younger than age 10. Dr. Bolger seeks to determine if those mutations may have an effect on the stress response in the cancer cells.

“This is a very fundamental research project right now,” Dr. Bolger said. “But if we understand stress responses, then that may tell us something about how cancer cells are bypassing these stress responses. The knowledge gained could be used in future projects to design therapeutics for those diseases.”

Dr. Bolger’s research also investigates the connection between stress response pathways and aging, since the ability to produce a robust cellular stress response has been linked to human longevity.

National Institute of General Medical Sciences, a unit of the National Institutes of Health, under Award No. 1R01GM136827-01.

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NOTE: Photos available here – https://arizona.box.com/s/ip0yvclifyy16a9mca5rdohjbv9t0lqz.

About the University of Arizona Cancer Center
The University of Arizona Cancer Center is the only National Cancer Institute-designated Comprehensive Cancer Center with headquarters in Arizona. The UArizona Cancer Center is supported by NCI Cancer Center Support Grant No. CA023074. With primary locations at the University of Arizona in Tucson and at Dignity Health St. Joseph’s Hospital and Medical Center in Phoenix, the Arizona Cancer Center has more than a dozen research and education offices throughout the state, with more than 300 physicians and scientists working together to prevent and cure cancer. For more information: cancercenter.arizona.edu (Follow us: YouTube).

About the University of Arizona Health Sciences
The University of Arizona Health Sciences is the statewide leader in biomedical research and health professions training. UArizona Health Sciences includes the Colleges of Medicine (Tucson and Phoenix), Nursing, Pharmacy, and the Mel and Enid Zuckerman College of Public Health, with main campus locations in Tucson and the Phoenix Biomedical Campus in downtown Phoenix. From these vantage points, Health Sciences reaches across the state of Arizona, the greater Southwest and around the world to provide next-generation education, research and outreach. A major economic engine, Health Sciences employs nearly 5,000 people, has approximately 4,000 students and 900 faculty members, and garners $200 million in research grants and contracts annually. For more information: uahs.arizona.edu (Follow us: Facebook | Twitter | YouTube | LinkedIn | Instagram).

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