• Activating a naturally occurring protein can set off immune-system response
• Role of cholesterol levels in cells’ membrane surprised researchers
• Findings could lead to development of antiviral prevention and treatment therapies
“Previous studies have shown that our bodies are already equipped to block viruses such as Ebola, influenza, West Nile, and SARS,” said Jae U. Jung, principal investigator and distinguished professor and chair of the Department of Molecular Microbiology and Immunology. The study, “The antiviral effector IFITM3 disrupts intracellular cholesterol homeostasis to block viral entry,” was published in the journal Cell Host & Microbe on April 17, 2013.
“We showed how this occurs,” Jung said. “When a virus tries to enter, the immune system gets stimulated by interferon, which produces almost 300 host proteins, including IFITM3. This protein then disrupts the interaction between two other proteins, which, in turn, significantly increases the level of cholesterol in cells, and thereby blocks the virus.”
Jung added that the increase in cholesterol is only within the endosome compartment of cells and has no impact on or effect from the level of cholesterol in the bloodstream.
Joining Jung in the study were Samad Amini-Bavil-Olyaee, Keck School postdoctoral research associate and first author of the paper, as well as Youn Jung Choi, Keck School graduate student and second author, and researchers from the University of California, Riverside and Scripps Research Institute. The research was funded by the National Institutes of Health (grants CA082057, CA31363, CA115284, DE019085, AI073099, AI083025, HL110609) and the Fletcher Jones Foundation.
Scientists long have known that interferon, a protein released by the body’s cells and named after its ability to “interfere” with viral replication, can inhibit the spread of viruses, but didn’t understand how. The Keck School investigators found that interferon-inducible transmembrane protein 3 (IFITM3) can disrupt the interaction between Vesicle-membrane-associated protein (VAPA) and oxysterol-binding protein (OSBP) that regulates the transport and stability of cholesterol, which are required for many viruses to take hold.
One of the main goals of his lab, Jung said, is to understand how the immune system recognizes viruses and blocks entry. In previous research, he and his colleagues have shown that a specific immune protein recognizes genetic information of the virus and then sets off an alarm signal in the host immune system.
Jung explained that in the most recent investigation, the rise in cholesterol was found to occur in the endosome compartment within the cell membrane. “The membrane is usually very flexible,” he said. “With an increase in cholesterol it becomes rigid, and doesn’t allow viruses to pass through the endosome compartment into cytosol, the fluid portion inside cells. We were surprised to find that changing the balance of cholesterol concentration affects viral entry.”
The next step, he said, “will be to identify a therapeutic molecule that activates the expression and function of the IFITM3 protein, which potentially can be used to create an anti-viral therapy. It could target the endosome compartment in order to control, combat, or prevent the spread of viral infection.”
Amini-Bavil-Olyaee, S., Choi, Y.J., Lee, J.H., Shi, M.,
Huang, I., Farzan, M. and Jung, J.U. The antiviral effector IFITM3 disrupts intracellular cholesterol homeostasis to block viral entry. Cell Host & Microbe. Published April 17, 2013.
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