Cancer cells mediate immune suppression in the brain | News | Notre Dame News | University of Notre Dame Skip To Content Skip To Navigation Skip To Search University of Notre Dame Notre Dame News Experts ND in the News Subscribe About Us Home Contact Search Menu Home › News › Cancer cells mediate immune suppression in the brain Cancer cells mediate immune suppression in the brain Published: October 27, 2020 Author: Deanna Csomo McCool Research. Photo by Matt Cashore/University of Notre Dame. Scientists have long believed that the brain protects itself from an aggressive immune response to keep down inflammation. However, that evolutionary control may work against it when a cancer cell attempts to spread to the brain, researchers at the University of Notre Dame have discovered. In newly published research in the journal Cell, researchers showed that one type of cell important for immunity, called a myeloid cell, can suppress the immune response — which has the effect of allowing breast cancer cells to metastasize to the brain to form secondary tumor cells there. “We wanted to understand how the brain immune environment responds to the tumor, and there are so many different cells, and so many changes,” said Siyuan Zhang, the Dee Associate Professor in the Department of Biological Sciences, a researcher for Harper Cancer Research Institute and a co-author on the paper. “The traditional belief was that the process described in this paper would be anti-tumor, but in our case, after a lot of experimenting, we discovered it is a proponent of metastasis.” Through single-cell sequencing — not powerful enough even a few years ago for this type of work — and an imaging technique, the researchers discovered that a myeloid cell type called microglia promoted the outgrowth of breast cancer that has spread to the brain by the expression of several proteins. The microglia release one protein — an immune cell-attracting protein called CXCL10 — to recruit more microglia to the metastasis. All these microglia express a protein named VISTA, which serves as protection against brain inflammation. But when faced with a cancer cell, this two-part process suppressed important T-cells. T-cells, which heighten the body’s immune response, would usually prevent the spread of cancer throughout the body. The activation of the VISTA checkpoint had not previously been known as a potential promoter of brain metastasis, said the paper’s lead author, Ian Guldner, a graduate student in Zhang’s lab. In addition to using a mouse model for the research, the team used data mining techniques to validate how humans’ brains would respond.  Clinically, the discovery is relevant, because antibodies have been developed that blocked VISTA in humans, Guldner said. However, significant additional work needs to be performed to ensure the safe and effective use of VISTA-blocking antibodies in people with brain metastases. Learning about the structures within cells in the brain will help researchers not only understand cancer, but also degenerative diseases such as Parkinson’s, multiple sclerosis and Alzheimer’s, Zhang said. “The brain immune system is a very active field, since brain cells are dysregulated during the aging process,” Zhang said. “There is so much to learn.” In addition to Guldner and Zhang, other collaborators include Qingfei Wang, Lin Yang, Samantha Golomb, Zhuo Zhao, Jacqueline A. Lopez, Abigail Brunory, Erin Howe, Yizhe Zhang, Bhavana Palakurthi, Martin Barron, Hongyu Gao, Xiaoling Xuei, Yunlong Liu, Jun Li, Danny Chen, all of Notre Dame, and Gary E. Landreth, part of the Indiana University School of Medicine Stark Neurosciences Research Institute in Indianapolis. Zhang is also affiliated with the Indiana University Melvin and Bren Simon Comprehensive Cancer Center, also in Indianapolis. The research was funded by three grants from the National Institutes of Health, a Notre Dame CRND Catalyst award and the Nancy Dee Family Endowment. Contact: Jessica Sieff, assistant director of media relations, 574-631-3933, jsieff@nd.edu Posted In: Research Home Experts ND in the News Subscribe About Us Related October 05, 2022 Astrophysicists find evidence for the presence of the first stars October 04, 2022 NIH awards $4 million grant to psychologists researching suicide prevention September 29, 2022 Notre Dame, Ukrainian Catholic University launch three new research grants September 27, 2022 Notre Dame, Trinity College Dublin engineers join to advance novel treatment for cystic fibrosis September 22, 2022 Climate-prepared countries are losing ground, latest ND-GAIN index shows For the Media Contact Office of Public Affairs and Communications Notre Dame News 500 Grace Hall Notre Dame, IN 46556 USA Facebook Twitter Instagram YouTube Pinterest © 2022 University of Notre Dame Search Mobile App News Events Visit Accessibility Facebook Twitter Instagram YouTube LinkedIn